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<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>
<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 1pt"><B>As filed with the Securities and Exchange Commission on November&nbsp;12, 2009</B>
</DIV>

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    <TD align="left" valign="top">&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top"><B>Registration No.&nbsp;333-</B>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<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: 12pt"><B>UNITED STATES<BR>
SECURITIES AND EXCHANGE COMMISSION</B>
</DIV>

<DIV align="center" style="font-size: 12pt"><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: 12pt"><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">
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    <TD width="47%">&nbsp;</TD>
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<TR valign="bottom">
    <TD align="center" valign="top"><B>Delaware</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>39-0126090</B></TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">(State or other jurisdiction <BR>
of incorporation or organization)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">(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>
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<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>
Second Amended and Restated 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" style="font-size: 10pt; margin-top: 18pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></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" style="font-size: 10pt; margin-top: 18pt"><DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>Indicate by check mark whether the registrant is a large accelerated filer, an accelerated
filer, a non-accelerated filer, or a smaller reporting company. See the definitions of &#147;large
accelerated filer,&#148; &#147;accelerated filer&#148; and &#147;smaller reporting company&#148; in Rule&nbsp;12b-2 of the
Exchange Act.</B>
</DIV>

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    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px"><B>Large accelerated filer <FONT face="Wingdings">&#111;</FONT></B>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top"><B>Accelerated filer <FONT style="font-family: Wingdings">&#120;</FONT></B></TD>
</TR>
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    <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"><B>Non-accelerated filer <FONT face="Wingdings">&#111;</FONT> (Do not check if a smaller reporting company)</B>
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top"><B>Smaller reporting company <FONT face="Wingdings">&#111;</FONT></B></TD>
</TR>
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</TABLE>
</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%">
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<TR valign="bottom">
    <TD width="1%">&nbsp;</TD>
    <TD width="54%">&nbsp;</TD>
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    <TD width="2%">&nbsp;</TD>
    <TD width="7%">&nbsp;</TD>
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    <TD width="2%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
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    <TD width="2%">&nbsp;</TD>
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    <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>&nbsp;</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="center"><B>Title of securities 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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    <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 $0.01 per share
</DIV></TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 2px solid #000000"><FONT style="white-space: nowrap">7,000,000 shares (1)</FONT>
</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD nowrap align="right" valign="top" style="border-top: 2px solid #000000">$</TD>
    <TD align="right" valign="top" style="border-top: 2px solid #000000">3.55</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">$</TD>
    <TD align="right" valign="top" style="border-top: 2px solid #000000">24,850,000</TD>
    <TD nowrap valign="top" style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD nowrap align="right" valign="top" style="border-top: 2px solid #000000">$</TD>
    <TD align="right" valign="top" style="border-top: 2px solid #000000">1,386.63</TD>
    <TD nowrap valign="top" style="border-top: 2px solid #000000">(2)</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>

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</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 an increase in the shares reserved for issuance under the Allis-Chalmers Energy
Inc. Second Amended and Restated 2006 Incentive Plan (the &#147;Plan&#148;) from 1,500,000 shares of
common stock to 8,500,000 shares of common stock. Pursuant to Rule 416(a) under the
Securities Act of 1933, as amended (the &#147;Securities Act&#148;), 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>

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<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>Estimated solely for the purpose of computing the registration fee, pursuant to Rule 457(h)
and Rule 457(c) under the Securities Act. The offering price of the shares of common stock
and registration fee are calculated in accordance with these rules based on the average of the
high and low prices of the shares on November&nbsp;10, 2009 as reported on the New York Stock
Exchange.</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>

</DIV>

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






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<A name="toc"><DIV align="CENTER" style="page-break-before:always"><U><B>TABLE OF CONTENTS</B></U></DIV></A>

<P><CENTER>
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</TR>
<TR><TD colspan="9"><A HREF="#000">INCORPORATION BY REFERENCE OF PRIOR REGISTRATION STATEMENT</A></TD></TR>
<TR><TD colspan="9"><A HREF="#001">PART II</A></TD></TR>
<TR><TD colspan="9"><A HREF="#002">INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#003">Item&nbsp;3. Incorporation of Documents by Reference.</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#004">Item&nbsp;6. Indemnification of Directors and Officers.</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#005">Item&nbsp;8. Exhibits.</A></TD></TR>
<TR><TD colspan="9"><A HREF="#006">SIGNATURES</A></TD></TR>
<TR><TD colspan="9"><A HREF="#007">POWER OF ATTORNEY</A></TD></TR>
<TR><TD colspan="9"><A HREF="#008">EXHIBIT INDEX</A></TD></TR>
<TR><TD colspan="9"><A HREF="h68623exv5w1.htm">EX-5.1</A></TD></TR>
<TR><TD colspan="9"><A HREF="h68623exv23w1.htm">EX-23.1</A></TD></TR>
</TABLE>
</CENTER>
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<!-- link1 "INCORPORATION BY REFERENCE OF PRIOR REGISTRATION STATEMENT" -->
<DIV align="left"><A NAME="000"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>INCORPORATION BY REFERENCE OF PRIOR REGISTRATION STATEMENT</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This Registration Statement on Form S-8 is being filed for the purpose of registering an
additional 7,000,000 shares of the Registrant&#146;s common stock that may be issued pursuant to the
Registrant&#146;s Second Amended and Restated 2006 Incentive Plan (the &#147;Plan&#148;) pursuant to the
Registration Statement on Form S-8, File No.&nbsp;333-139957, filed with the Securities and Exchange
Commission, or the SEC, on January&nbsp;12, 2007 (the &#147;Prior Registration Statement&#148;).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This Registration Statement relates to securities of the same class as those to which the
Prior Registration Statement relates, and is submitted in accordance with General Instruction E to
Form S-8 regarding Registration of Additional Securities. Pursuant to General Instruction E of Form
S-8, the contents of the Prior Registration Statement are incorporated herein by reference and made
part of this Registration Statement, except as amended hereby.
</DIV>
<!-- link1 "PART II" -->
<DIV align="left"><A NAME="001"></A></DIV>

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

<!-- link1 "INFORMATION REQUIRED IN THE REGISTRATION STATEMENT" -->
<DIV align="left"><A NAME="002"></A></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"><A NAME="003"></A></DIV>

<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, 2008, as filed
with the SEC on March&nbsp;9, 2009, as amended by Amendment No.&nbsp;1 to such report, as filed
with the SEC on April&nbsp;30, 2009.</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, 2009, as
filed with the SEC on May&nbsp;8, 2009.</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, 2009, as filed
with the SEC on August&nbsp;6, 2009.</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, 2009, as
filed with the SEC on November&nbsp;5, 2009.</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, as filed with the SEC on January&nbsp;5, 2009,
January&nbsp;7, 2009, March&nbsp;13, 2009, April&nbsp;9, 2009, May&nbsp;27, 2009, June&nbsp;2, 2009, July&nbsp;1,
2009, August&nbsp;11, 2009, September&nbsp;2, 2009, October&nbsp;16, 2009 and November&nbsp;12, 2009.</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>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 March&nbsp;16, 2007, 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 by us with the SEC 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 in 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 securities then remaining unsold, shall be deemed
to be incorporated by reference in this Registration Statement and to be 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>

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</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">
<!-- link2 "Item&nbsp;6. Indemnification of Directors and Officers." -->
<DIV align="left"><A NAME="004"></A></DIV>

<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;Allis-Chalmers Energy Inc. (&#147;Allis-Chalmers&#148;)
is incorporated in the State of Delaware.
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. Allis-Chalmers&#146;
Amended and Restated Certificate of Incorporation (the &#147;Certificate of Incorporation&#148;) and its
by-laws provide for the indemnification by Allis-Chalmers of each director, officer and employee of
Allis-Chalmers to the fullest extent permitted by the Delaware General Corporation Law, as the same
exists or may hereafter be amended.
</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;Allis-Chalmers&#146; Certificate of Incorporation provides that a director of Allis-Chalmers&#146; shall
not be liable to Allis-Chalmers or its stockholders for monetary damages for breach of fiduciary
duty as a director. Section&nbsp;102(b)(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 to the corporation
or its stockholders; acts or omissions not in good faith or which involve intentional misconduct or
a knowing violation of the law; unlawful payment of dividends or unlawful stock purchase or
redemption pursuant to Section&nbsp;174 of the Delaware General Corporation Law; 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;Allis-Chalmers has obtained officers&#146; and directors&#146; liability insurance to insure against
liabilities that its officers and directors, in such capacities, may incur.
</DIV>
<!-- link2 "Item&nbsp;8. Exhibits." -->
<DIV align="left"><A NAME="005"></A></DIV>

<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>


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

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

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



<!-- link1 "SIGNATURES" -->
<DIV align="left"><A NAME="006"></A></DIV>

<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 November&nbsp;12, 2009.
</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/ Theodore F. Pound
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">Theodore F. Pound&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">General Counsel and Secretary&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
</TABLE>
<!-- link1 "POWER OF ATTORNEY" -->
<DIV align="left"><A NAME="007"></A></DIV>

<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 the
registrant 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 and resubstitution, 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="30%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="30%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="30%">&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"><DIV align="left">/s/ Munawar H. Hidayatallah</DIV>
<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">November&nbsp;12, 2009</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"><DIV align="left">/s/ Victor M. Perez</DIV>
<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">November&nbsp;12, 2009</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"><DIV align="left">/s/ Bruce Sauers</DIV>
<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">November&nbsp;12, 2009</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"><DIV align="left">/s/ Saad Bargach</DIV>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Saad Bargach
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">November&nbsp;12, 2009</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"><DIV align="left">/s/ Alejandro P. Bulgheroni</DIV>
<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">November&nbsp;12, 2009</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"><DIV align="left">/s/ Giovanni Dell&#146; Orto</DIV>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Giovanni Dell&#146; Orto
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">November&nbsp;12, 2009</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"><DIV align="left">/s/ Victor F. Germack</DIV>
<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">November&nbsp;12, 2009</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"><DIV align="left">/s/ James M. Hennessy</DIV>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
James M. Hennessy
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">November&nbsp;12, 2009</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"><DIV align="left">/s/ Robert E. Nederlander</DIV>
<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">November&nbsp;12, 2009</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"><DIV align="left">/s/ John T. Reynolds</DIV>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
John T. Reynolds
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">November&nbsp;12, 2009</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"><DIV align="left">/s/ Zane Tankel</DIV>
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Zane Tankel
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">November&nbsp;12, 2009</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


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

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

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

<!-- link1 "EXHIBIT INDEX" -->
<DIV align="left"><A NAME="008"></A></DIV>

<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="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3">Exhibit</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3" 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 nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.1</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Amended and Restated Certificate of Incorporation of the 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).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.2</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Second Amended and Restated By-laws of the Registrant (incorporated by reference to Exhibit&nbsp;3.1
to the Registrant&#146;s Current Report on Form&nbsp;8-K filed on April&nbsp;3, 2008).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.3</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">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 on February&nbsp;21, 2002).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.4</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Certificate of Designations of 7% Convertible Perpetual Preferred Stock (incorporated by
reference to Exhibit&nbsp;3.1 to the Registrant&#146;s Current Report on Form&nbsp;8-K filed July&nbsp;1, 2009).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.5</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">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).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.6</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Certificate of Amendment of Certificate of Incorporation filed with the Delaware Secretary of
State on January&nbsp;5, 2005 (incorporated by reference to Exhibit&nbsp;3.5 to the Registrant&#146;s Current
Report on Form&nbsp;8-K filed on January&nbsp;11, 2005).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.7</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Certificate of Amendment of Certificate of Incorporation filed with the Delaware Secretary of
State on August&nbsp;16, 2005 (incorporated by reference to Exhibit&nbsp;3.5 to the Registrant&#146;s Current
Report on Form&nbsp;8-K filed on August&nbsp;17, 2005).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.8</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Specimen 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).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.9</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Registration Rights Agreement dated as of March&nbsp;31, 1999, by and between Allis-Chalmers
Corporation and the Pension Benefit Guaranty Corporation (incorporated by reference to Exhibit
10.3 to the Registrant&#146;s Quarterly Report on Form&nbsp;10-Q for the quarter ended June&nbsp;30, 1999).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.10</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Registration Rights Agreement dated as of January&nbsp;29, 2007 by and among the Registrant, the
Guarantors named therein and the Initial Purchasers named therein (incorporated by reference to
Exhibit&nbsp;10.2 to the Registrant&#146;s Current Report on Form&nbsp;8-K filed on January&nbsp;29, 2007).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.11</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Registration Rights Agreement dated as of January&nbsp;18, 2006 by and among the Registrant, the
Guarantors named therein and the Initial Purchasers named therein (incorporated by reference to
Exhibit&nbsp;10.2 to the Registrant&#146;s Current Report on Form&nbsp;8-K filed on January&nbsp;24, 2006).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.12</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Registration Rights Agreement dated as of August&nbsp;14, 2006 by and among the Registrant, the
guarantors listed on Schedule&nbsp;A thereto and RBC Capital Markets Corporation (incorporated by
reference to Exhibit&nbsp;10.1 to the Registrant&#146;s Form&nbsp;8-K filed on August&nbsp;14, 2006).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.13</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Registration Rights Agreement dated June&nbsp;26, 2009 between the Registrant and Lime Rock Partners
V, L.P. (incorporated by reference to Exhibit&nbsp;4.2 to the Registrant&#146;s Current Report on Form
8-K filed on July&nbsp;1, 2009).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.14</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Indenture dated as of January&nbsp;18, 2006 by and among the Registrant, the Guarantors named
therein and Wells Fargo Bank, N.A., as trustee (incorporated by reference to Exhibit&nbsp;4.1 to the
Registrant&#146;s Current Report on Form&nbsp;8-K filed on January&nbsp;24, 2006).</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


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

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></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="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3">Exhibit</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3" 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 nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.15</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">First Supplemental Indenture dated as of August&nbsp;11, 2006 by and among Allis-Chalmers GP, LLC,
Allis-Chalmers LP, LLC, Allis-Chalmers Management, LP, Rogers Oil Tool Services, Inc., the
Registrant, the other Guarantors (as defined in the Indenture referred to therein) and Wells
Fargo Bank, N.A (incorporated by reference to Exhibit&nbsp;4.2 to the Registrant&#146;s Form&nbsp;8-K filed on
August&nbsp;14, 2006).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.16</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Second Supplemental Indenture dated as of January&nbsp;23, 2007 by and among Petro-Rentals,
Incorporated, the Registrant, the other Guarantor parties thereto and Wells Fargo Bank, N.A.,
as trustee (incorporated by reference to Exhibit&nbsp;10.1 to the Registrant&#146;s Current Report on
Form&nbsp;8-K filed on January&nbsp;24, 2007).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.17</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Indenture dated as of January&nbsp;29, 2007 by and among the Registrant, the Guarantors named
therein and Wells Fargo Bank, N.A. (incorporated by reference to Exhibit&nbsp;4.1 to the
Registrant&#146;s Current Report on Form&nbsp;8-K filed on January&nbsp;29, 2007).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.18</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of 9.0% Senior Note due 2014 (incorporated by reference to Exhibit&nbsp;A to Exhibit&nbsp;4.1 to the
Registrant&#146;s Current Report on Form&nbsp;8-K filed on January&nbsp;24, 2006).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.19</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of 8.5% Senior Note due 2017 (incorporated by reference to Exhibit&nbsp;A to Exhibit&nbsp;4.1 to the
Registrant&#146;s Current Report on Form&nbsp;8-K filed on January&nbsp;29, 2007).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.20</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Investment Agreement dated May&nbsp;20, 2009 between the Registrant and Lime Rock Partners V, L.P.
(incorporated by reference to Exhibit&nbsp;4.1 to the Registrant&#146;s Current Report on Form&nbsp;8-K filed
on May&nbsp;27, 2009).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.21</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">First Amendment to Investment Agreement dated June&nbsp;25, 2009 between the Registrant and Lime
Rock Partners V, L.P. (incorporated by reference to Exhibit&nbsp;4.1 to the Registrant&#146;s Current
Report on Form&nbsp;8-K filed on July&nbsp;1, 2009).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.22</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Second Amendment to Investment Agreement dated September&nbsp;1, 2009 between the Registrant and
Lime Rock Partners V, L.P. (incorporated by reference to Exhibit&nbsp;4.1 to the Registrant&#146;s
Current Report on Form&nbsp;8-K filed on September&nbsp;2, 2009).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.23&#134;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Second Amended and Restated 2006 Incentive Plan (incorporated by reference to Exhibit&nbsp;10.1 to
the Registrant&#146;s Current Report on Form&nbsp;8-K filed on November&nbsp;12, 2009).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">5.1*</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Opinion of Andrews Kurth LLP with respect to legality of the securities.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">23.1*</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Consent of UHY LLP.</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">23.2*</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Consent of Andrews Kurth LLP (included as part of Exhibit&nbsp;5.1).</DIV></TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">24.1*</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Power of Attorney (set forth on the signature page of this registration statement).</DIV></TD>
</TR>
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</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 -->&nbsp;<!-- /Folio -->
</DIV>




</BODY>
</HTML>
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sv8
Table of Contents
As filed with the Securities and Exchange Commission on November 12, 2009
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
39-0126090
(State or other jurisdiction
of incorporation or organization)
(I.R.S. Employer
Identification No.)
5075 Westheimer, Suite 890
Houston, Texas
77056
(Address of Principal Executive Offices)
(Zip Code)
Allis-Chalmers Energy Inc.
Second Amended and Restated 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
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated
filer, a non-accelerated filer, or a smaller reporting company. See the definitions of "large
accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the
Exchange Act.
Large accelerated filer
o
Accelerated filer
x
Non-accelerated filer
o
(Do not check if a smaller reporting company)
Smaller reporting company
o
CALCULATION OF REGISTRATION FEE
Proposed maximum
Proposed maximum
Amount of
Amount to be
offering price
aggregate offering
registration
Title of securities to be registered
registered
per share
price
fee
Common Stock, par value $0.01 per share
7,000,000 shares (1)
$
3.55
$
24,850,000
$
1,386.63
(2)
(1)
Represents an increase in the shares reserved for issuance under the Allis-Chalmers Energy
Inc. Second Amended and Restated 2006 Incentive Plan (the "Plan") from 1,500,000 shares of
common stock to 8,500,000 shares of common stock. Pursuant to Rule 416(a) under the
Securities Act of 1933, as amended (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.
(2)
Estimated solely for the purpose of computing the registration fee, pursuant to Rule 457(h)
and Rule 457(c) under the Securities Act. The offering price of the shares of common stock
and registration fee are calculated in accordance with these rules based on the average of the
high and low prices of the shares on November 10, 2009 as reported on the New York Stock
Exchange.
TABLE OF CONTENTS
INCORPORATION BY REFERENCE OF PRIOR REGISTRATION STATEMENT
PART II
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 3. Incorporation of Documents by Reference.
Item 6. Indemnification of Directors and Officers.
Item 8. Exhibits.
SIGNATURES
POWER OF ATTORNEY
EXHIBIT INDEX
EX-5.1
EX-23.1
Table of Contents
INCORPORATION BY REFERENCE OF PRIOR REGISTRATION STATEMENT
This Registration Statement on Form S-8 is being filed for the purpose of registering an
additional 7,000,000 shares of the Registrant's common stock that may be issued pursuant to the
Registrant's Second Amended and Restated 2006 Incentive Plan (the "Plan") pursuant to the
Registration Statement on Form S-8, File No. 333-139957, filed with the Securities and Exchange
Commission, or the SEC, on January 12, 2007 (the "Prior Registration Statement").
This Registration Statement relates to securities of the same class as those to which the
Prior Registration Statement relates, and is submitted in accordance with General Instruction E to
Form S-8 regarding Registration of Additional Securities. Pursuant to General Instruction E of Form
S-8, the contents of the Prior Registration Statement are incorporated herein by reference and made
part of this Registration Statement, except as amended hereby.
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, 2008, as filed
with the SEC on March 9, 2009, as amended by Amendment No. 1 to such report, as filed
with the SEC on April 30, 2009.
(2)
Our quarterly report on Form 10-Q for the quarter ended March 31, 2009, as
filed with the SEC on May 8, 2009.
(3)
Our quarterly report on Form 10-Q for the quarter ended June 30, 2009, as filed
with the SEC on August 6, 2009.
(4)
Our quarterly report on Form 10-Q for the quarter ended September 30, 2009, as
filed with the SEC on November 5, 2009.
(5)
Our current reports on Form 8-K, as filed with the SEC on January 5, 2009,
January 7, 2009, March 13, 2009, April 9, 2009, May 27, 2009, June 2, 2009, July 1,
2009, August 11, 2009, September 2, 2009, October 16, 2009 and November 12, 2009.
(6)
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 March 16, 2007, and
any amendment or report subsequently filed by us for the purpose of updating such
description.
All documents filed by us with the SEC 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 in 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 securities then remaining unsold, shall be deemed
to be incorporated by reference in this Registration Statement and to be 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.
Table of Contents
Item 6. Indemnification of Directors and Officers.
Allis-Chalmers Energy Inc. ("Allis-Chalmers")
is incorporated in the State of Delaware.
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. Allis-Chalmers'
Amended and Restated Certificate of Incorporation (the "Certificate of Incorporation") and its
by-laws provide for the indemnification by Allis-Chalmers of each director, officer and employee of
Allis-Chalmers to the fullest extent permitted by the Delaware General Corporation Law, as the same
exists or may hereafter be amended.
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.
Allis-Chalmers' Certificate of Incorporation provides that a director of Allis-Chalmers' shall
not be liable to Allis-Chalmers or its stockholders for monetary damages for breach of fiduciary
duty as a director. Section 102(b)(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 to the corporation
or its stockholders; acts or omissions not in good faith or which involve intentional misconduct or
a knowing violation of the law; unlawful payment of dividends or unlawful stock purchase or
redemption pursuant to Section 174 of the Delaware General Corporation Law; and transactions from
which the director derived an improper personal benefit.
Allis-Chalmers has obtained officers' and directors' liability insurance to insure against
liabilities that its officers and directors, in such capacities, may incur.
Item 8. Exhibits.
The exhibits listed in the accompanying Exhibit Index are filed (except where otherwise
indicated) as part of this Registration Statement.
Table of Contents
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 November 12, 2009.
ALLIS-CHALMERS ENERGY INC.
By:
/s/ Theodore F. Pound
Theodore F. Pound
General Counsel and Secretary
POWER OF ATTORNEY
KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned officers and directors of the
registrant 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 and resubstitution, 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)
November 12, 2009
/s/ Victor M. Perez
Victor M. Perez
Chief Financial Officer
(Principal Financial Officer)
November 12, 2009
/s/ Bruce Sauers
Bruce Sauers
Chief Accounting Officer
(Principal Accounting Officer)
November 12, 2009
/s/ Saad Bargach
Saad Bargach
Director
November 12, 2009
/s/ Alejandro P. Bulgheroni
Alejandro P. Bulgheroni
Director
November 12, 2009
/s/ Giovanni Dell' Orto
Giovanni Dell' Orto
Director
November 12, 2009
/s/ Victor F. Germack
Victor F. Germack
Director
November 12, 2009
/s/ James M. Hennessy
James M. Hennessy
Director
November 12, 2009
/s/ Robert E. Nederlander
Robert E. Nederlander
Director
November 12, 2009
/s/ John T. Reynolds
John T. Reynolds
Director
November 12, 2009
/s/ Zane Tankel
Zane Tankel
Director
November 12, 2009
Table of Contents
EXHIBIT INDEX
Exhibit
Number
Description
4.1
Amended and Restated Certificate of Incorporation of the 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).
4.2
Second Amended and Restated By-laws of the Registrant (incorporated by reference to Exhibit 3.1
to the Registrant's Current Report on Form 8-K filed on April 3, 2008).
4.3
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 on February 21, 2002).
4.4
Certificate of Designations of 7% Convertible Perpetual Preferred Stock (incorporated by
reference to Exhibit 3.1 to the Registrant's Current Report on Form 8-K filed July 1, 2009).
4.5
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).
4.6
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 on January 11, 2005).
4.7
Certificate of Amendment of Certificate of Incorporation filed with the Delaware Secretary of
State on August 16, 2005 (incorporated by reference to Exhibit 3.5 to the Registrant's Current
Report on Form 8-K filed on August 17, 2005).
4.8
Specimen 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).
4.9
Registration Rights Agreement dated as of March 31, 1999, by and between Allis-Chalmers
Corporation and the Pension Benefit Guaranty Corporation (incorporated by reference to Exhibit
10.3 to the Registrant's Quarterly Report on Form 10-Q for the quarter ended June 30, 1999).
4.10
Registration Rights Agreement dated as of January 29, 2007 by and among the Registrant, the
Guarantors named therein and the Initial Purchasers named therein (incorporated by reference to
Exhibit 10.2 to the Registrant's Current Report on Form 8-K filed on January 29, 2007).
4.11
Registration Rights Agreement dated as of January 18, 2006 by and among the Registrant, the
Guarantors named therein and the Initial Purchasers named therein (incorporated by reference to
Exhibit 10.2 to the Registrant's Current Report on Form 8-K filed on January 24, 2006).
4.12
Registration Rights Agreement dated as of August 14, 2006 by and among the Registrant, the
guarantors listed on Schedule A thereto and RBC Capital Markets Corporation (incorporated by
reference to Exhibit 10.1 to the Registrant's Form 8-K filed on August 14, 2006).
4.13
Registration Rights Agreement dated June 26, 2009 between the Registrant and Lime Rock Partners
V, L.P. (incorporated by reference to Exhibit 4.2 to the Registrant's Current Report on Form
8-K filed on July 1, 2009).
4.14
Indenture dated as of January 18, 2006 by and among the Registrant, the Guarantors named
therein and Wells Fargo Bank, N.A., as trustee (incorporated by reference to Exhibit 4.1 to the
Registrant's Current Report on Form 8-K filed on January 24, 2006).
Table of Contents
Exhibit
Number
Description
4.15
First Supplemental Indenture dated as of August 11, 2006 by and among Allis-Chalmers GP, LLC,
Allis-Chalmers LP, LLC, Allis-Chalmers Management, LP, Rogers Oil Tool Services, Inc., the
Registrant, the other Guarantors (as defined in the Indenture referred to therein) and Wells
Fargo Bank, N.A (incorporated by reference to Exhibit 4.2 to the Registrant's Form 8-K filed on
August 14, 2006).
4.16
Second Supplemental Indenture dated as of January 23, 2007 by and among Petro-Rentals,
Incorporated, the Registrant, the other Guarantor parties thereto and Wells Fargo Bank, N.A.,
as trustee (incorporated by reference to Exhibit 10.1 to the Registrant's Current Report on
Form 8-K filed on January 24, 2007).
4.17
Indenture dated as of January 29, 2007 by and among the Registrant, the Guarantors named
therein and Wells Fargo Bank, N.A. (incorporated by reference to Exhibit 4.1 to the
Registrant's Current Report on Form 8-K filed on January 29, 2007).
4.18
Form of 9.0% Senior Note due 2014 (incorporated by reference to Exhibit A to Exhibit 4.1 to the
Registrant's Current Report on Form 8-K filed on January 24, 2006).
4.19
Form of 8.5% Senior Note due 2017 (incorporated by reference to Exhibit A to Exhibit 4.1 to the
Registrant's Current Report on Form 8-K filed on January 29, 2007).
4.20
Investment Agreement dated May 20, 2009 between the Registrant and Lime Rock Partners V, L.P.
(incorporated by reference to Exhibit 4.1 to the Registrant's Current Report on Form 8-K filed
on May 27, 2009).
4.21
First Amendment to Investment Agreement dated June 25, 2009 between the Registrant and Lime
Rock Partners V, L.P. (incorporated by reference to Exhibit 4.1 to the Registrant's Current
Report on Form 8-K filed on July 1, 2009).
4.22
Second Amendment to Investment Agreement dated September 1, 2009 between the Registrant and
Lime Rock Partners V, L.P. (incorporated by reference to Exhibit 4.1 to the Registrant's
Current Report on Form 8-K filed on September 2, 2009).
4.23†
Second Amended and Restated 2006 Incentive Plan (incorporated by reference to Exhibit 10.1 to
the Registrant's Current Report on Form 8-K filed on November 12, 2009).
5.1*
Opinion of Andrews Kurth LLP with respect to legality of the securities.
23.1*
Consent of UHY LLP.
23.2*
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.