Allis Chalmers Energy Inc.

Q: Sep 30 2011

Q: Sep 30 2011

Q: Mar 31 2011

Q: Jun 30 2011

FY: Dec 31 2010

Q: Jun 30 2011

Q: Mar 31 2011

FY: Dec 31 2010

Q: Sep 30 2010

Q: Jun 30 2010

Q: Mar 31 2010

FY: Dec 31 2009

Q: Sep 30 2009

Q: Jun 30 2009

Q: Mar 31 2009

FY: Dec 31 2008

FY: Dec 31 2008

Q: Sep 30 2008

Q: Jun 30 2008

FY: Dec 31 2007

4.02

4.01,9.01

1.01,2.01,2.03,3.03,5.01,5.03,8.01,9.01

1.01,3.01,5.02,5.07,9.01

8.01,9.01

5.02,8.01

Material Impairments

1.01,5.02,9.01

Results of Operations and Financial Condition

Entry into a Material Definitive Agreement

Entry into a Material Definitive Agreement

1.01,5.02,9.01

Entry into a Material Definitive Agreement

2.02,7.01,9.01

1.01,9.01

5.07

1.01,5.02,9.01

Results of Operations and Financial Condition

5.02,7.01,9.01

5.02,9.01

No description available

Certification of termination of registration of a class of securities (Section 12(b))

Post Effective Amendment to S-8

Notification of removal from listing and/or registration on a national securities exchange

Post Effective Amendment to S-8

Post Effective Amendment to S-8

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Withdrawal of a registration statement

Registration statement under Securities Act of 1933 (amendment)

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

No description available

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Bulgheroni Alejandro Pedro

LIME ROCK PARTNERS V LP

KEANE TERRENCE P

PEREZ VICTOR M

Pound Ted

LIME ROCK PARTNERS V LP; Lime Rock Partners GP V, L.P.; LRP GP V, Inc.

Patterson Mark C

HENNESSY JAMES M

Sauers Bruce

Etcheverry Carlos F

Dell' Orto Giovanni

NEDERLANDER ROBERT E ET AL

Bargach Saad

HIDAYATALLAH MUNAWAR H

Germack Victor F

REYNOLDS JOHN T

Bulgheroni Alejandro Pedro

Associated Petroleum Investors Ltd.

Tankel Zane

Dell' Orto Giovanni

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Correspondence with the SEC

Letter from the SEC

Annual Report Scanned (Paper)

Annual Report Scanned (Paper)

Annual Report Scanned (Paper)

Correspondence with the SEC

Correspondence with the SEC

Correspondence with the SEC

Letter from the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

No description available

Annual Report Scanned (Paper)

No description available

Notification of the removal from listing and registration of matured redeemed or retired securities