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<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>As
filed with the Securities and Exchange Commission on January&nbsp;12, 2007</B>
</DIV>


<DIV align="right" style="font-size: 10pt; margin-top: 1pt"><B>Registration No.&nbsp;333-</B>
</DIV>


<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 1pt solid black; font-size: 1pt">&nbsp;</DIV>




<DIV align="center" style="font-size: 14pt; margin-top: 6pt"><B>UNITED STATES<BR>
SECURITIES AND EXCHANGE COMMISSION</B>
</DIV>

<DIV align="center" style="font-size: 14pt; margin-top: 1pt"><B>Washington, D.C. 20549</B>
</DIV>

<DIV align="center" style="font-size: 18pt; margin-top: 12pt"><B>FORM S-8</B>
</DIV>


<DIV align="center" style="font-size: 12pt; margin-top: 18pt"><B>REGISTRATION STATEMENT UNDER<BR>
THE SECURITIES ACT OF 1933</B>
</DIV>

<DIV align="center" style="font-size: 24pt; margin-top: 12pt"><B>ALLIS-CHALMERS ENERGY INC.</B>
</DIV>

<DIV align="center" style="font-size: 10pt">(Exact name of registrant as specified in its charter)</DIV>


<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="47%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="center" valign="top"><B>Delaware</B><BR>
(State or other jurisdiction <BR>
of incorporation or organization)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>39-0126090</B><BR>
(I.R.S. Employer<BR>
Identification No.)</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><B>5075 Westheimer, Suite&nbsp;890</B></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><B>Houston, Texas</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>77056</B></TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">(Address of Principal Executive Offices)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">(Zip Code)</TD>
</TR>
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</TABLE>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>Allis-Chalmers Energy Inc.<BR>
2006 Incentive Plan</B><BR>
(Full title of the plan)
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>Victor M. Perez, Chief Financial Officer<BR>
Allis-Chalmers Energy Inc.<BR>
5075 Westheimer, Suite&nbsp;890<BR>
Houston, Texas 77056</B><BR>
(Name and address of agent for service)
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>(713)&nbsp;369-0550</B><BR>
(Telephone number, including area code, of agent for service)
</DIV>


<DIV align="center">
<DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV>




<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B><I>Copies to:</I></B><BR>
<B>Robert V. Jewell<BR>
Andrews Kurth LLP<BR>
600 Travis, Suite&nbsp;4200<BR>
Houston, Texas 77002<BR>
(713)&nbsp;220-4200</B>
</DIV>


<DIV align="center">
<DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV>




<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>CALCULATION OF REGISTRATION FEE</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="26%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>

    <TD width="1%">&nbsp;</TD>
</TR><TR style="font-size: 1px" valign="bottom">
    <TD nowrap align="left" colspan="21" style="border-bottom: 3px double #000000">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Proposed maximum</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Proposed maximum</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Amount of</b></TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="left"><B>Title of securities</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Amount to be</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>offering price</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>aggregate offering</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>registration</b></TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="left"><B>to be registered</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>registered</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>per share</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>price</B></TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>fee</b></TD>
    <TD width="1%">&nbsp;</TD>
</TR>

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<TR valign="bottom">
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
                    <TD valign="top" style="border-top: 2px solid #000000"><DIV style="margin-left:0px; text-indent:-0px">Common Stock, par value $0.01 per share
</DIV></TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="top" style="border-top: 2px solid #000000">1,500,000 shares (1)(2)</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD nowrap align="right" valign="top" style="border-top: 2px solid #000000">$</TD>

<TD align="right" valign="top" style="border-top: 2px solid #000000">18.71</TD>
    <TD nowrap valign="top" style="border-top: 2px solid #000000">(1)</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD nowrap align="right" valign="top" style="border-top: 2px solid #000000">$</TD>

<TD align="right" valign="top" style="border-top: 2px solid #000000">28,065,000</TD>
    <TD nowrap valign="top" style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD nowrap align="right" valign="top" style="border-top: 2px solid #000000">$</TD>

<TD align="right" valign="top" style="border-top: 2px solid #000000">3,003</TD>
    <TD nowrap valign="top" style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
</TR>
<TR style="font-size: 1px" valign="bottom">
    <TD nowrap align="left" colspan="21" style="border-top: 3px double #000000">&nbsp;</TD>
</TR>

<!-- End Table Body -->
</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="1%" nowrap align="left">(1)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Represents 1,500,000 shares of common stock reserved for issuance under the Allis-Chalmers
Energy Inc. 2006 Incentive Plan. The registration fee for such shares was calculated in
accordance with Rule 457(h) under the Securities Act of 1933, as amended, based on the average
of the high and low prices of the common stock on January&nbsp;9, 2007 as reported on the American
Stock Exchange.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="1%" nowrap align="left">(2)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Pursuant to Rule 416(a) under the Securities Act, there is also being registered such
additional number of shares of common stock that become available under the plan because of
events such as recapitalizations, stock dividends, stock splits or similar transactions
effected without the receipt of consideration that increases the number of outstanding shares
of common stock.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="width: 100%; border-bottom: 1pt solid black; margin-top: 10pt; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>






<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">








<!-- link1 "PART I" -->

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>PART I</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The document(s) containing the information specified in Part&nbsp;I of Form S-8 (plan information
and registrant information) will be sent or given to participants in the Allis-Chalmers Energy Inc.
2006 Incentive Plan (which we refer to as the Plan) as specified by Rule&nbsp;428(b)(1) under the
Securities Act of 1933, as amended (which we refer to as the Securities Act). In accordance with
Rule&nbsp;428 and the requirements of Part&nbsp;I of Form S-8, such documents are not being filed with the
Securities and Exchange Commission, or the SEC, either as part of this registration statement or as
prospectuses or prospectus supplements pursuant to Rule&nbsp;424 under the Securities Act. We shall
maintain a file of such documents in accordance with the provisions of Rule&nbsp;428(a)(2) of the
Securities Act. Upon request, we shall furnish to the SEC or its staff a copy of any or all of the
documents included in the file.
</DIV>
<!-- link1 "PART II" -->

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>PART II</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</B>
</DIV>

<!-- link2 "Item&nbsp;3. Incorporation of Documents by Reference." -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;3. Incorporation of Documents by Reference.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We incorporate by reference in this registration statement the following documents and
information previously filed with the SEC, other than any portions of the respective filings that
were furnished (pursuant to Item&nbsp;2.02 or Item&nbsp;7.01 of current reports on Form 8-K or other
applicable SEC rules) rather than filed. Unless the context requires otherwise, references in this
registration statement to &#147;Allis-Chalmers,&#148; &#147;the registrant,&#148; &#147;we,&#148; &#147;us,&#148; or &#147;our&#148; refer to
Allis-Chalmers Energy Inc. and its direct and indirect subsidiaries on a consolidated basis.
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(1)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Our annual report on Form 10-K for the year ended December&nbsp;31, 2005, as filed
with the SEC on March&nbsp;22, 2006, as amended by Amendment No.&nbsp;1 to such report, as filed
with the SEC on May&nbsp;1, 2006, and Amendment No.&nbsp;2 to such report, as filed with the SEC
on July&nbsp;24, 2006.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(2)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Our quarterly report on Form 10-Q for the quarter ended March&nbsp;31, 2006, as
filed with the SEC on May&nbsp;10, 2006, as amended by Amendment No.&nbsp;1 to such report, as
filed with the SEC on July&nbsp;24, 2006.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(3)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Our quarterly report on Form 10-Q for the quarter ended June&nbsp;30, 2006, as filed
with the SEC on August&nbsp;14, 2006.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(4)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Our quarterly report on Form 10-Q for the quarter ended September&nbsp;30, 2006, as
filed with the SEC on November&nbsp;8, 2006, as amended by Amendment No.&nbsp;1 to such report,
as filed with the SEC on December&nbsp;29, 2006.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(5)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Our current reports on Form 8-K and Form 8-K/A, as filed with the SEC on
January&nbsp;24, 2006, February&nbsp;1, 2006 (three reports), February&nbsp;3, 2006, February&nbsp;24,
2006, April&nbsp;3, 2006, April&nbsp;6, 2006, April&nbsp;25, 2006, April&nbsp;28, 2006, May&nbsp;9, 2006, June
16, 2006, July&nbsp;17, 2006, July&nbsp;27, 2006, August&nbsp;9, 2006, August&nbsp;14, 2006 (two reports),
August&nbsp;23, 2006, September&nbsp;18, 2006, September&nbsp;29, 2006, October&nbsp;19, 2006, October&nbsp;26,
2006, December&nbsp;1, 2006, December&nbsp;14, 2006, December&nbsp;19 2006, December&nbsp;26, 2006,
December&nbsp;29, 2006 and January&nbsp;4, 2007.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(6)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Our current reports on Form 8-K and Form 8-K/A containing additional
information required by Rule&nbsp;3-05 and Article&nbsp;11 of Regulation&nbsp;S-X, as filed with the
SEC on April&nbsp;5, 2005, May&nbsp;6, 2005, June&nbsp;10, 2005, July&nbsp;15, 2005 and September&nbsp;2, 2005.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="3%" nowrap align="left">(7)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The description of our common stock, par value $0.01 per share, set forth in
our Registration Statement on Form 8-A, as filed with the SEC on September&nbsp;10, 2004,
and any amendment or report subsequently filed by us for the purpose of updating such
description.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All documents filed with the SEC by us pursuant to Sections&nbsp;13(a), 13(c), 14 or 15(d) of the
Securities Exchange Act of 1934, as amended (excluding any information furnished pursuant to Item
2.02 and Item&nbsp;7.01 on any current report on Form 8-K), subsequent to the date of this registration
statement and prior to the filing of a post-effective amendment which indicates that all securities
offered have been sold or which deregisters all
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->II-1<!-- /Folio -->
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="left" style="font-size: 10pt; margin-top: 6pt">securities then remaining unsold, shall be deemed to be incorporated by reference in this
registration statement and to be a part hereof from the date of filing of such documents.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Any statement contained herein or in a document incorporated or deemed to be incorporated
herein by reference shall be deemed to be modified or superseded for purposes of this registration
statement to the extent that a statement contained herein or in any subsequently filed document
which also is, or is deemed to be, incorporated by reference herein modifies or supersedes such
statement. Any such statement so modified or superseded shall not be deemed, except as so modified
or superseded, to constitute a part of this registration statement.
</DIV>
<!-- link2 "Item&nbsp;4. Description of Securities." -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;4. Description of Securities.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
</DIV>
<!-- link2 "Item&nbsp;5. Interests of Named Experts and Counsel." -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;5. Interests of Named Experts and Counsel.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;None.
</DIV>
<!-- link2 "Item&nbsp;6. Indemnification of Directors and Officers." -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;6. Indemnification of Directors and Officers.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The registrant&#146;s Amended and Restated Certificate of Incorporation (the &#147;Certificate of
Incorporation&#148;) and its by-laws provide for the indemnification by the registrant of each director,
officer and employee of the registrant to the fullest extent permitted by the Delaware General
Corporation Law, as the same exists or may hereafter be amended. Section&nbsp;145 of the Delaware
General Corporation Law provides in relevant part that a corporation may indemnify any person who
was or is a party or is threatened to be made a party to any threatened, pending or completed
action, suit or proceeding, whether civil, criminal, administrative or investigative (other than an
action by or in the right of the corporation) by reason of the fact that such person is or was a
director, officer, employee or agent of the corporation, or is or was serving at the request of the
corporation as a director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise, against expenses (including attorneys&#146; fees), judgments, fines
and amounts paid in settlement actually and reasonably incurred by such person in connection with
such action, suit or proceeding if such person acted in good faith and in a manner such person
reasonably believed to be in or not opposed to the best interests of the corporation, and, with
respect to any criminal action or proceeding, had no reasonable cause to believe such person&#146;s
conduct was unlawful.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In addition, Section&nbsp;145 provides that a corporation may indemnify any person who was or is a
party or is threatened to be made a party to any threatened, pending or completed action or suit by
or in the right of the corporation to procure a judgment in its favor by reason of the fact that
such person is or was a director, officer, employee or agent of the corporation, or is or was
serving at the request of the corporation as a director, officer, employee or agent of another
corporation, partnership, joint venture, trust or other enterprise against expenses (including
attorneys&#146; fees) actually and reasonably incurred by such person in connection with the defense or
settlement of such action or suit if such person acted in good faith and in a manner such person
reasonably believed to be in or not opposed to the best interests of the corporation and except
that no indemnification shall be made in respect of any claim, issue or matter as to which such
person shall have been adjudged to be liable to the corporation unless and only to the extent that
the Delaware Court of Chancery or the court in which such action or suit was brought shall
determine upon application that, despite the adjudication of liability but in view of all the
circumstances of the case, such person is fairly and reasonably entitled to indemnity for such
expenses which the Delaware Court of Chancery or such other court shall deem proper. Delaware law
further provides that nothing in the above described provisions shall be deemed exclusive of any
other rights to indemnification or advancement of expenses to which any person may be entitled
under any bylaw, agreement, vote of stockholders or disinterested directors or otherwise.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The registrant&#146;s Certificate of Incorporation provides that a director of the registrant shall
not be liable to the registrant or its stockholders for monetary damages for breach of fiduciary
duty as a director. Section&nbsp;102(o)(7) of the Delaware General Corporation Law provides that a
provision so limiting the personal liability of a director shall not eliminate or limit the
liability of a director for, among other things: breach of the duty of loyalty; acts or omissions
not in good faith or which involve intentional misconduct or a knowing violation of the law;
unlawful payment of dividends; and transactions from which the director derived an improper
personal benefit.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The registrant has entered into separate but identical indemnity agreements (the &#147;Indemnity
Agreements&#148;) with each director of the registrant and certain officers of the registrant (the
&#147;Indemnitees&#148;). Pursuant to the terms and conditions of the Indemnity Agreements, the registrant
indemnified each Indemnitee against any amounts which he or she becomes legally obligated to pay in
connection with any claim against him or her based upon any action or inaction which he or she may
commit, omit or suffer while acting in his or her capacity as a director and/or officer of
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->II-2<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="left" style="font-size: 10pt; margin-top: 6pt">the registrant or its subsidiaries, provided, however, that Indemnitee acted in good faith and
in a manner Indemnitee reasonably believed to be in or not opposed to the best interests of the
registrant and, with respect to any criminal action, had no reasonable cause to believe
Indemnitee&#146;s conduct was unlawful.
</DIV>
<!-- link2 "Item&nbsp;7. Exemption from Registration Claimed." -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;7. Exemption from Registration Claimed.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
</DIV>
<!-- link2 "Item&nbsp;8. Exhibits." -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;8. Exhibits.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The exhibits listed in the accompanying Exhibit&nbsp;Index are filed (except where otherwise
indicated) as part of this registration statement.
</DIV>
<!-- link2 "Item&nbsp;9. Undertakings." -->

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;9. Undertakings.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The undersigned registrant hereby undertakes:

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (1)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; To file, during any period in which offers or sales are being made, a post-effective
amendment to this registration statement:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 5%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; To include any prospectus required by Section&nbsp;10(a)(3) of the Securities Act of
1933;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 5%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; To reflect in the prospectus any facts or events arising after the effective date
of the registration statement (or the most recent post-effective amendment thereof) which,
individually or in the aggregate, represent a fundamental change in the information set
forth in the registration statement. Notwithstanding the foregoing, any increase or
decrease in volume of securities offered (if the total dollar value of securities offered
would not exceed that which was registered) and any deviation from the low or high end of
the estimated maximum offering range may be reflected in the form of prospectus filed with
the Securities and Exchange Commission pursuant to Rule 424(b) if, in the aggregate, the
changes in volume and price represent no more than a 20% change in the maximum aggregate
offering price set forth in the &#147;Calculation of Registration Fee&#148; table in the effective
registration statement;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 5%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;To include any material information with respect to the plan of distribution not
previously disclosed in the registration statement or any material change to such
information in the registration statement;
</DIV>

<DIV align="left" style="margin-left: 0%; text-indent: 0%; margin-right: 0%; font-size: 10pt; margin-top: 6pt"><I>Provided, however, </I>That paragraphs (a)(1)(i) and (a)(1)(ii) of this section do not apply if the
information required to be included in a post-effective amendment by those paragraphs is contained
in periodic reports filed with or furnished to the Securities and Exchange Commission by the
registrant pursuant to section 13 or section 15(d) of the Securities Exchange Act of 1934 that are
incorporated by reference in the registration statement.</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; That, for the purpose of determining any liability under the Securities Act of 1933, each
such post-effective amendment shall be deemed to be a new registration statement relating to the
securities offered therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; To remove from registration by means of a post-effective amendment any of the securities
being registered which remain unsold at the termination of the offering.
</DIV>

<DIV align="left" style="margin-left: 0%; text-indent: 0%; margin-right: 0%; font-size: 10pt; margin-top: 6pt">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The undersigned registrant hereby undertakes that, for purposes of determining any liability
under the Securities Act of 1933, each filing of the registrant&#146;s annual report pursuant to section
13(a) or section 15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing
of an employee benefit plan&#146;s annual report pursuant to section 15(d) of the Securities Exchange
Act of 1934) that is incorporated by reference in the registration statement shall be deemed to be
a new registration statement relating to the securities offered therein, and the offering of such
securities at that time shall be deemed to be the initial bona fide offering thereof.</DIV>


<DIV align="left" style="margin-left: 0%; text-indent: 0%; margin-right: 0%; font-size: 10pt; margin-top: 6pt">(h)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be
permitted to directors, officers and controlling persons of the registrant pursuant to the
provisions described under Item&nbsp;6 above, or otherwise, the registrant has been advised that in the
opinion of the Securities and Exchange Commission such indemnification is against public policy as
expressed in the Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment of the registrant of expenses
incurred or paid by a director, officer or controlling person of the registrant in the successful
defense of any action, suit or proceeding) is asserted by such director, officer or controlling
person in connection with the securities being registered, the registrant will, unless in the
opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether such indemnification
by it is against public policy as expressed in the Act and will be governed by the final
adjudication of such issue.</DIV>



<P align="center" style="font-size: 10pt"><!-- Folio -->II-3<!-- /Folio -->
</DIV>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>


<DIV style="font-family: 'Times New Roman',Times,serif">



<!-- link1 "SIGNATURES" -->

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>SIGNATURES</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it
has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and
has duly caused this registration statement to be signed on its behalf by the undersigned,
thereunto duly authorized, in the City of Houston, State of Texas, on
January&nbsp;12, 2007.
</DIV>

<TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
<TR>
    <TD width="48%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
</TR>
<TR>
    <TD valign="top" align="left">&nbsp;</TD>
    <TD colspan="3" align="left">ALLIS-CHALMERS ENERGY INC.<BR>
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD valign="top">By:&nbsp;&nbsp;</TD>
    <TD colspan="2" style="border-bottom: 1px solid #000000" align="left">                   /s/ Victor M. Perez
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">Victor M. Perez&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">Chief Financial Officer&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
</TABLE>
<!-- link1 "POWER OF ATTORNEY" -->

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>POWER OF ATTORNEY</B>
</DIV>



<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned officers and directors of
Allis-Chalmers Energy Inc. hereby constitutes and appoints Munawar H. Hidayatallah, Victor M. Perez
and Theodore F. Pound III, and each of them (with full power to each of them to act alone), his
true and lawful attorney-in-fact and agent, with full power of substitution, for him and on his
behalf and in his name, place and stead, in any and all capacities, to sign, execute and file this
Registration Statement on Form S-8 under the Securities Act of 1933, as amended, and any or all
amendments (including, without limitation, post-effective amendments), with all exhibits and any
and all documents required to be filed with respect thereto, with the Securities and Exchange
Commission or any regulatory authority, granting unto such attorneys-in-fact and agents, and each
of them, full power and authority to do and perform each and every act and thing requisite and
necessary to be done in order to effectuate the same, as fully to all intents and purposes as he
himself might or could do if personally present, hereby ratifying and confirming all that such
attorneys-in-fact and agents, or any of them, or their substitute or substitutes, may lawfully do
or cause to be done.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, this registration statement has
been signed by the following persons in the capacities and on the date indicated.
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="31%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="31%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="31%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Signature</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Title</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Date</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">/s/ Munawar H. Hidayatallah<BR>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Munawar H. Hidayatallah
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Chief Executive Officer and<BR>Chairman of the Board<BR>
(Principal Executive Officer)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">January&nbsp;12, 2007</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">/s/ Burt A. Adams<BR>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Burt A. Adams
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Vice Chairman of the Board, President and<BR>
Chief Operating Officer
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">January&nbsp;12, 2007</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">/s/ Victor M. Perez<BR>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Victor M. Perez
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Chief Financial Officer<BR>
(Principal Financial Officer)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">January&nbsp;12, 2007</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">/s/ Bruce Sauers<BR>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Bruce Sauers
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Chief Accounting Officer<BR>
(Principal Accounting Officer)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">January&nbsp;12, 2007</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">/s/ Ali H. M. Afdhal<BR>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Ali H. M. Afdhal
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">January&nbsp;12, 2007</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><BR>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Alejandro P. Bulgheroni
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><BR>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Carlos A. Bulgheroni
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">/s/ Jeffrey R. Freedman<BR>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Jeffrey R. Freedman
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">January&nbsp;12, 2007</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">/s/ Victor F. Germack<BR>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Victor F. Germack
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">January&nbsp;12, 2007</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->II-4<!-- /Folio -->
</DIV>

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<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>



<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="31%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="31%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="31%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Signature</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Title</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Date</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>

<TR valign="bottom">
    <TD align="center" valign="top">/s/ John E. McConnaughy, Jr.<BR>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
John E. McConnaughy, Jr.
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">January&nbsp;12, 2007</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">/s/ Robert E. Nederlander<BR>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Robert E. Nederlander
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">January&nbsp;12, 2007</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">/s/ Leonard Toboroff<BR>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Leonard Toboroff
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">January&nbsp;12, 2007</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->II-5<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<!-- link1 "EXHIBIT INDEX" -->

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>EXHIBIT INDEX</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="9%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left">Exhibit</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000">Number</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left" style="border-bottom: 1px solid #000000">Description</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Amended and Restated Certificate of Incorporation of Registrant (incorporated
by reference to Exhibit&nbsp;3.1 to the Registrant&#146;s Annual Report on Form&nbsp;10-K for the year
ended December&nbsp;31, 2001 (SEC File No.&nbsp;002-59583)).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Certificate of Designations, Preferences and Rights of the Series&nbsp;A 10%
Cumulative Convertible Preferred Stock ($.01 Par Value) of the Registrant (incorporated
by reference to Exhibit&nbsp;3.1 to the Registrant&#146;s Current Report on Form&nbsp;8-K filed
February&nbsp;21, 2002 (SEC File No.&nbsp;002-59583)).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.3
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Amended and Restated By-laws of Registrant (incorporated by reference to
Exhibit&nbsp;3.3 to the Registrant&#146;s Annual Report on Form&nbsp;10-K for the year ended December
31, 2001 (SEC File No.&nbsp;002-59583)).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.4
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Certificate of Amendment of Certificate of Incorporation filed with the
Delaware Secretary of State on June&nbsp;9, 2004 (incorporated by reference to Exhibit&nbsp;3.3
to the Registrant&#146;s Quarterly Report on Form&nbsp;10-Q for the quarter ended June&nbsp;30, 2004
(SEC File No.&nbsp;002-59583)).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.5
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Certificate of Amendment of Certificate of Incorporation filed with the
Delaware Secretary of State on January&nbsp;5, 2005 (incorporated by reference to Exhibit
3.5 to the Registrant&#146;s Current Report on Form&nbsp;8-K filed January&nbsp;11, 2005 (SEC File No.
001-02199)).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.6
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Specimen of Stock Certificate of Common Stock of the Registrant (incorporated
by reference to Exhibit&nbsp;4.1 to the Registrant&#146;s Quarterly Report on Form&nbsp;10-Q for the
quarter ended June&nbsp;30, 2004 (SEC File No.&nbsp;002-59583)).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.7&#134;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Allis-Chalmers Energy Inc. 2006 Incentive Plan (incorporated by reference to
Exhibit&nbsp;10.1 to the Registrant&#146;s Current Report on Form&nbsp;8-K filed September&nbsp;18, 2006
(SEC File No.&nbsp;001-02199)).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.8&#134;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Form of Employee Restricted Stock Agreement (incorporated by reference to
Exhibit&nbsp;10.2 to the Registrant&#146;s Current Report on Form&nbsp;8-K filed September&nbsp;18, 2006
(SEC File No.&nbsp;001-02199)).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.9&#134;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Form of Employee Nonqualified Stock Option Agreement (incorporated by reference
to Exhibit&nbsp;10.3 to the Registrant&#146;s Current Report on Form&nbsp;8-K filed September&nbsp;18, 2006
(SEC File No.&nbsp;001-02199)).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.10&#134;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Form of Employee Incentive Stock Option Agreement (incorporated by reference
to Exhibit&nbsp;10.4 to the Registrant&#146;s Current Report on Form&nbsp;8-K filed September&nbsp;18, 2006
(SEC File No.&nbsp;001-02199)).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.11&#134;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Form of Non-Employee Director Restricted Stock Agreement (incorporated by
reference to Exhibit&nbsp;10.5 to the Registrant&#146;s Current Report on Form&nbsp;8-K filed
September&nbsp;18, 2006 (SEC File No.&nbsp;001-02199)).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.12&#134;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Form of Non-Employee Director Nonqualified Stock Option Agreement
(incorporated by reference to Exhibit&nbsp;10.6 to the Registrant&#146;s Current Report on Form
8-K filed September&nbsp;18, 2006 (SEC File No.&nbsp;001-02199)).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">5.1*
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Opinion of Andrews Kurth LLP with respect to legality of the securities.</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1*
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of UHY Mann Frankfort Stein &#038; Lipp CPAs, LLP.</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.2*
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Gordon, Hughes and Banks, LLP.</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.3*
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Wright, Moore, Dehart, Dupuis &#038; Hutchinson, LLC.</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.4*
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Curtis Blakely &#038; Co., PC.</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.5*
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Accounting &#038; Consulting Group, LLP.</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio --><!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="9%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left">Exhibit</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000">Number</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left" style="border-bottom: 1px solid #000000">Description</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.6*
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of UHY Mann Frankfort Stein &#038; Lipp CPAs, LLP.</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.7*
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Sibille (formerly Finsterbusch Pickenhayn Sibille).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.8*
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Broussard, Poche, Lewis &#038; Breaux, L.L.P.</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.9*
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of UHY LLP.</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.10*
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Andrews Kurth LLP (included as part of Exhibit&nbsp;5.1).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">24.1*
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Power of Attorney (set forth on the signature page of this registration statement).</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>



<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 16pt; width: 18%; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96"></TD>
</TR>

<TR valign="top">
    <TD nowrap align="left">&#134;</TD>
    <TD>&nbsp;</TD>
    <TD>Compensation plan or arrangement.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">*</TD>
    <TD>&nbsp;</TD>
    <TD>Filed herewith.</TD>
</TR>

</TABLE>




<P align="center" style="font-size: 10pt"><!-- Folio --><!-- /Folio -->
</DIV>

</BODY>
</HTML>
[{"type": "S-8", "sequence": "1", "filename": "h42592sv8.htm", "description": "FORM S-8", "secsgml_size_bytes": 59172}]
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sv8
As
filed with the Securities and Exchange Commission on January 12, 2007
Registration No. 333-
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM S-8
REGISTRATION STATEMENT UNDER
THE SECURITIES ACT OF 1933
ALLIS-CHALMERS ENERGY INC.
(Exact name of registrant as specified in its charter)
Delaware
(State or other jurisdiction
of incorporation or organization)
39-0126090
(I.R.S. Employer
Identification No.)
5075 Westheimer, Suite 890
Houston, Texas
77056
(Address of Principal Executive Offices)
(Zip Code)
Allis-Chalmers Energy Inc.
2006 Incentive Plan
(Full title of the plan)
Victor M. Perez, Chief Financial Officer
Allis-Chalmers Energy Inc.
5075 Westheimer, Suite 890
Houston, Texas 77056
(Name and address of agent for service)
(713) 369-0550
(Telephone number, including area code, of agent for service)
Copies to:
Robert V. Jewell
Andrews Kurth LLP
600 Travis, Suite 4200
Houston, Texas 77002
(713) 220-4200
CALCULATION OF REGISTRATION FEE
Proposed maximum
Proposed maximum
Amount of
Title of securities
Amount to be
offering price
aggregate offering
registration
to be registered
registered
per share
price
fee
Common Stock, par value $0.01 per share
1,500,000 shares (1)(2)
$
18.71
(1)
$
28,065,000
$
3,003
(1)
Represents 1,500,000 shares of common stock reserved for issuance under the Allis-Chalmers
Energy Inc. 2006 Incentive Plan. The registration fee for such shares was calculated in
accordance with Rule 457(h) under the Securities Act of 1933, as amended, based on the average
of the high and low prices of the common stock on January 9, 2007 as reported on the American
Stock Exchange.
(2)
Pursuant to Rule 416(a) under the Securities Act, there is also being registered such
additional number of shares of common stock that become available under the plan because of
events such as recapitalizations, stock dividends, stock splits or similar transactions
effected without the receipt of consideration that increases the number of outstanding shares
of common stock.
PART I
INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS
The document(s) containing the information specified in Part I of Form S-8 (plan information
and registrant information) will be sent or given to participants in the Allis-Chalmers Energy Inc.
2006 Incentive Plan (which we refer to as the Plan) as specified by Rule 428(b)(1) under the
Securities Act of 1933, as amended (which we refer to as the Securities Act). In accordance with
Rule 428 and the requirements of Part I of Form S-8, such documents are not being filed with the
Securities and Exchange Commission, or the SEC, either as part of this registration statement or as
prospectuses or prospectus supplements pursuant to Rule 424 under the Securities Act. We shall
maintain a file of such documents in accordance with the provisions of Rule 428(a)(2) of the
Securities Act. Upon request, we shall furnish to the SEC or its staff a copy of any or all of the
documents included in the file.
PART II
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 3. Incorporation of Documents by Reference.
We incorporate by reference in this registration statement the following documents and
information previously filed with the SEC, other than any portions of the respective filings that
were furnished (pursuant to Item 2.02 or Item 7.01 of current reports on Form 8-K or other
applicable SEC rules) rather than filed. Unless the context requires otherwise, references in this
registration statement to "Allis-Chalmers," "the registrant," "we," "us," or "our" refer to
Allis-Chalmers Energy Inc. and its direct and indirect subsidiaries on a consolidated basis.
(1)
Our annual report on Form 10-K for the year ended December 31, 2005, as filed
with the SEC on March 22, 2006, as amended by Amendment No. 1 to such report, as filed
with the SEC on May 1, 2006, and Amendment No. 2 to such report, as filed with the SEC
on July 24, 2006.
(2)
Our quarterly report on Form 10-Q for the quarter ended March 31, 2006, as
filed with the SEC on May 10, 2006, as amended by Amendment No. 1 to such report, as
filed with the SEC on July 24, 2006.
(3)
Our quarterly report on Form 10-Q for the quarter ended June 30, 2006, as filed
with the SEC on August 14, 2006.
(4)
Our quarterly report on Form 10-Q for the quarter ended September 30, 2006, as
filed with the SEC on November 8, 2006, as amended by Amendment No. 1 to such report,
as filed with the SEC on December 29, 2006.
(5)
Our current reports on Form 8-K and Form 8-K/A, as filed with the SEC on
January 24, 2006, February 1, 2006 (three reports), February 3, 2006, February 24,
2006, April 3, 2006, April 6, 2006, April 25, 2006, April 28, 2006, May 9, 2006, June
16, 2006, July 17, 2006, July 27, 2006, August 9, 2006, August 14, 2006 (two reports),
August 23, 2006, September 18, 2006, September 29, 2006, October 19, 2006, October 26,
2006, December 1, 2006, December 14, 2006, December 19 2006, December 26, 2006,
December 29, 2006 and January 4, 2007.
(6)
Our current reports on Form 8-K and Form 8-K/A containing additional
information required by Rule 3-05 and Article 11 of Regulation S-X, as filed with the
SEC on April 5, 2005, May 6, 2005, June 10, 2005, July 15, 2005 and September 2, 2005.
(7)
The description of our common stock, par value $0.01 per share, set forth in
our Registration Statement on Form 8-A, as filed with the SEC on September 10, 2004,
and any amendment or report subsequently filed by us for the purpose of updating such
description.
All documents filed with the SEC by us pursuant to Sections 13(a), 13(c), 14 or 15(d) of the
Securities Exchange Act of 1934, as amended (excluding any information furnished pursuant to Item
2.02 and Item 7.01 on any current report on Form 8-K), subsequent to the date of this registration
statement and prior to the filing of a post-effective amendment which indicates that all securities
offered have been sold or which deregisters all
II-1
securities then remaining unsold, shall be deemed to be incorporated by reference in this
registration statement and to be a part hereof from the date of filing of such documents.
Any statement contained herein or in a document incorporated or deemed to be incorporated
herein by reference shall be deemed to be modified or superseded for purposes of this registration
statement to the extent that a statement contained herein or in any subsequently filed document
which also is, or is deemed to be, incorporated by reference herein modifies or supersedes such
statement. Any such statement so modified or superseded shall not be deemed, except as so modified
or superseded, to constitute a part of this registration statement.
Item 4. Description of Securities.
Not applicable.
Item 5. Interests of Named Experts and Counsel.
None.
Item 6. Indemnification of Directors and Officers.
The registrant's Amended and Restated Certificate of Incorporation (the "Certificate of
Incorporation") and its by-laws provide for the indemnification by the registrant of each director,
officer and employee of the registrant to the fullest extent permitted by the Delaware General
Corporation Law, as the same exists or may hereafter be amended. Section 145 of the Delaware
General Corporation Law provides in relevant part that a corporation may indemnify any person who
was or is a party or is threatened to be made a party to any threatened, pending or completed
action, suit or proceeding, whether civil, criminal, administrative or investigative (other than an
action by or in the right of the corporation) by reason of the fact that such person is or was a
director, officer, employee or agent of the corporation, or is or was serving at the request of the
corporation as a director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise, against expenses (including attorneys' fees), judgments, fines
and amounts paid in settlement actually and reasonably incurred by such person in connection with
such action, suit or proceeding if such person acted in good faith and in a manner such person
reasonably believed to be in or not opposed to the best interests of the corporation, and, with
respect to any criminal action or proceeding, had no reasonable cause to believe such person's
conduct was unlawful.
In addition, Section 145 provides that a corporation may indemnify any person who was or is a
party or is threatened to be made a party to any threatened, pending or completed action or suit by
or in the right of the corporation to procure a judgment in its favor by reason of the fact that
such person is or was a director, officer, employee or agent of the corporation, or is or was
serving at the request of the corporation as a director, officer, employee or agent of another
corporation, partnership, joint venture, trust or other enterprise against expenses (including
attorneys' fees) actually and reasonably incurred by such person in connection with the defense or
settlement of such action or suit if such person acted in good faith and in a manner such person
reasonably believed to be in or not opposed to the best interests of the corporation and except
that no indemnification shall be made in respect of any claim, issue or matter as to which such
person shall have been adjudged to be liable to the corporation unless and only to the extent that
the Delaware Court of Chancery or the court in which such action or suit was brought shall
determine upon application that, despite the adjudication of liability but in view of all the
circumstances of the case, such person is fairly and reasonably entitled to indemnity for such
expenses which the Delaware Court of Chancery or such other court shall deem proper. Delaware law
further provides that nothing in the above described provisions shall be deemed exclusive of any
other rights to indemnification or advancement of expenses to which any person may be entitled
under any bylaw, agreement, vote of stockholders or disinterested directors or otherwise.
The registrant's Certificate of Incorporation provides that a director of the registrant shall
not be liable to the registrant or its stockholders for monetary damages for breach of fiduciary
duty as a director. Section 102(o)(7) of the Delaware General Corporation Law provides that a
provision so limiting the personal liability of a director shall not eliminate or limit the
liability of a director for, among other things: breach of the duty of loyalty; acts or omissions
not in good faith or which involve intentional misconduct or a knowing violation of the law;
unlawful payment of dividends; and transactions from which the director derived an improper
personal benefit.
The registrant has entered into separate but identical indemnity agreements (the "Indemnity
Agreements") with each director of the registrant and certain officers of the registrant (the
"Indemnitees"). Pursuant to the terms and conditions of the Indemnity Agreements, the registrant
indemnified each Indemnitee against any amounts which he or she becomes legally obligated to pay in
connection with any claim against him or her based upon any action or inaction which he or she may
commit, omit or suffer while acting in his or her capacity as a director and/or officer of
II-2
the registrant or its subsidiaries, provided, however, that Indemnitee acted in good faith and
in a manner Indemnitee reasonably believed to be in or not opposed to the best interests of the
registrant and, with respect to any criminal action, had no reasonable cause to believe
Indemnitee's conduct was unlawful.
Item 7. Exemption from Registration Claimed.
Not applicable.
Item 8. Exhibits.
The exhibits listed in the accompanying Exhibit Index are filed (except where otherwise
indicated) as part of this registration statement.
Item 9. Undertakings.
(a)      The undersigned registrant hereby undertakes:
(1)      To file, during any period in which offers or sales are being made, a post-effective
amendment to this registration statement:
(i)      To include any prospectus required by Section 10(a)(3) of the Securities Act of
1933;
(ii)      To reflect in the prospectus any facts or events arising after the effective date
of the registration statement (or the most recent post-effective amendment thereof) which,
individually or in the aggregate, represent a fundamental change in the information set
forth in the registration statement. Notwithstanding the foregoing, any increase or
decrease in volume of securities offered (if the total dollar value of securities offered
would not exceed that which was registered) and any deviation from the low or high end of
the estimated maximum offering range may be reflected in the form of prospectus filed with
the Securities and Exchange Commission pursuant to Rule 424(b) if, in the aggregate, the
changes in volume and price represent no more than a 20% change in the maximum aggregate
offering price set forth in the "Calculation of Registration Fee" table in the effective
registration statement;
(iii)      To include any material information with respect to the plan of distribution not
previously disclosed in the registration statement or any material change to such
information in the registration statement;
Provided, however,
That paragraphs (a)(1)(i) and (a)(1)(ii) of this section do not apply if the
information required to be included in a post-effective amendment by those paragraphs is contained
in periodic reports filed with or furnished to the Securities and Exchange Commission by the
registrant pursuant to section 13 or section 15(d) of the Securities Exchange Act of 1934 that are
incorporated by reference in the registration statement.
(2)      That, for the purpose of determining any liability under the Securities Act of 1933, each
such post-effective amendment shall be deemed to be a new registration statement relating to the
securities offered therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.
(3)      To remove from registration by means of a post-effective amendment any of the securities
being registered which remain unsold at the termination of the offering.
(b)      The undersigned registrant hereby undertakes that, for purposes of determining any liability
under the Securities Act of 1933, each filing of the registrant's annual report pursuant to section
13(a) or section 15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing
of an employee benefit plan's annual report pursuant to section 15(d) of the Securities Exchange
Act of 1934) that is incorporated by reference in the registration statement shall be deemed to be
a new registration statement relating to the securities offered therein, and the offering of such
securities at that time shall be deemed to be the initial bona fide offering thereof.
(h)      Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be
permitted to directors, officers and controlling persons of the registrant pursuant to the
provisions described under Item 6 above, or otherwise, the registrant has been advised that in the
opinion of the Securities and Exchange Commission such indemnification is against public policy as
expressed in the Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment of the registrant of expenses
incurred or paid by a director, officer or controlling person of the registrant in the successful
defense of any action, suit or proceeding) is asserted by such director, officer or controlling
person in connection with the securities being registered, the registrant will, unless in the
opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether such indemnification
by it is against public policy as expressed in the Act and will be governed by the final
adjudication of such issue.
II-3
SIGNATURES
Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it
has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and
has duly caused this registration statement to be signed on its behalf by the undersigned,
thereunto duly authorized, in the City of Houston, State of Texas, on
January 12, 2007.
ALLIS-CHALMERS ENERGY INC.
By:
/s/ Victor M. Perez
Victor M. Perez
Chief Financial Officer
POWER OF ATTORNEY
KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned officers and directors of
Allis-Chalmers Energy Inc. hereby constitutes and appoints Munawar H. Hidayatallah, Victor M. Perez
and Theodore F. Pound III, and each of them (with full power to each of them to act alone), his
true and lawful attorney-in-fact and agent, with full power of substitution, for him and on his
behalf and in his name, place and stead, in any and all capacities, to sign, execute and file this
Registration Statement on Form S-8 under the Securities Act of 1933, as amended, and any or all
amendments (including, without limitation, post-effective amendments), with all exhibits and any
and all documents required to be filed with respect thereto, with the Securities and Exchange
Commission or any regulatory authority, granting unto such attorneys-in-fact and agents, and each
of them, full power and authority to do and perform each and every act and thing requisite and
necessary to be done in order to effectuate the same, as fully to all intents and purposes as he
himself might or could do if personally present, hereby ratifying and confirming all that such
attorneys-in-fact and agents, or any of them, or their substitute or substitutes, may lawfully do
or cause to be done.
Pursuant to the requirements of the Securities Act of 1933, this registration statement has
been signed by the following persons in the capacities and on the date indicated.
Signature
Title
Date
/s/ Munawar H. Hidayatallah
Munawar H. Hidayatallah
Chief Executive Officer and
Chairman of the Board
(Principal Executive Officer)
January 12, 2007
/s/ Burt A. Adams
Burt A. Adams
Vice Chairman of the Board, President and
Chief Operating Officer
January 12, 2007
/s/ Victor M. Perez
Victor M. Perez
Chief Financial Officer
(Principal Financial Officer)
January 12, 2007
/s/ Bruce Sauers
Bruce Sauers
Chief Accounting Officer
(Principal Accounting Officer)
January 12, 2007
/s/ Ali H. M. Afdhal
Ali H. M. Afdhal
Director
January 12, 2007
Alejandro P. Bulgheroni
Director
Carlos A. Bulgheroni
Director
/s/ Jeffrey R. Freedman
Jeffrey R. Freedman
Director
January 12, 2007
/s/ Victor F. Germack
Victor F. Germack
Director
January 12, 2007
II-4
Signature
Title
Date
/s/ John E. McConnaughy, Jr.
John E. McConnaughy, Jr.
Director
January 12, 2007
/s/ Robert E. Nederlander
Robert E. Nederlander
Director
January 12, 2007
/s/ Leonard Toboroff
Leonard Toboroff
Director
January 12, 2007
II-5
EXHIBIT INDEX
Exhibit
Number
Description
4.1
Amended and Restated Certificate of Incorporation of Registrant (incorporated
by reference to Exhibit 3.1 to the Registrant's Annual Report on Form 10-K for the year
ended December 31, 2001 (SEC File No. 002-59583)).
4.2
Certificate of Designations, Preferences and Rights of the Series A 10%
Cumulative Convertible Preferred Stock ($.01 Par Value) of the Registrant (incorporated
by reference to Exhibit 3.1 to the Registrant's Current Report on Form 8-K filed
February 21, 2002 (SEC File No. 002-59583)).
4.3
Amended and Restated By-laws of Registrant (incorporated by reference to
Exhibit 3.3 to the Registrant's Annual Report on Form 10-K for the year ended December
31, 2001 (SEC File No. 002-59583)).
4.4
Certificate of Amendment of Certificate of Incorporation filed with the
Delaware Secretary of State on June 9, 2004 (incorporated by reference to Exhibit 3.3
to the Registrant's Quarterly Report on Form 10-Q for the quarter ended June 30, 2004
(SEC File No. 002-59583)).
4.5
Certificate of Amendment of Certificate of Incorporation filed with the
Delaware Secretary of State on January 5, 2005 (incorporated by reference to Exhibit
3.5 to the Registrant's Current Report on Form 8-K filed January 11, 2005 (SEC File No.
001-02199)).
4.6
Specimen of Stock Certificate of Common Stock of the Registrant (incorporated
by reference to Exhibit 4.1 to the Registrant's Quarterly Report on Form 10-Q for the
quarter ended June 30, 2004 (SEC File No. 002-59583)).
4.7†
Allis-Chalmers Energy Inc. 2006 Incentive Plan (incorporated by reference to
Exhibit 10.1 to the Registrant's Current Report on Form 8-K filed September 18, 2006
(SEC File No. 001-02199)).
4.8†
Form of Employee Restricted Stock Agreement (incorporated by reference to
Exhibit 10.2 to the Registrant's Current Report on Form 8-K filed September 18, 2006
(SEC File No. 001-02199)).
4.9†
Form of Employee Nonqualified Stock Option Agreement (incorporated by reference
to Exhibit 10.3 to the Registrant's Current Report on Form 8-K filed September 18, 2006
(SEC File No. 001-02199)).
4.10†
Form of Employee Incentive Stock Option Agreement (incorporated by reference
to Exhibit 10.4 to the Registrant's Current Report on Form 8-K filed September 18, 2006
(SEC File No. 001-02199)).
4.11†
Form of Non-Employee Director Restricted Stock Agreement (incorporated by
reference to Exhibit 10.5 to the Registrant's Current Report on Form 8-K filed
September 18, 2006 (SEC File No. 001-02199)).
4.12†
Form of Non-Employee Director Nonqualified Stock Option Agreement
(incorporated by reference to Exhibit 10.6 to the Registrant's Current Report on Form
8-K filed September 18, 2006 (SEC File No. 001-02199)).
5.1*
Opinion of Andrews Kurth LLP with respect to legality of the securities.
23.1*
Consent of UHY Mann Frankfort Stein & Lipp CPAs, LLP.
23.2*
Consent of Gordon, Hughes and Banks, LLP.
23.3*
Consent of Wright, Moore, Dehart, Dupuis & Hutchinson, LLC.
23.4*
Consent of Curtis Blakely & Co., PC.
23.5*
Consent of Accounting & Consulting Group, LLP.
Exhibit
Number
Description
23.6*
Consent of UHY Mann Frankfort Stein & Lipp CPAs, LLP.
23.7*
Consent of Sibille (formerly Finsterbusch Pickenhayn Sibille).
23.8*
Consent of Broussard, Poche, Lewis & Breaux, L.L.P.
23.9*
Consent of UHY LLP.
23.10*
Consent of Andrews Kurth LLP (included as part of Exhibit 5.1).
24.1*
Power of Attorney (set forth on the signature page of this registration statement).
†
Compensation plan or arrangement.
*
Filed herewith.