X0303 4 2011-02-23 1 0000003982 Allis Chalmers Energy Inc. ALY 0001359742 Bargach Saad 274 RIVERSIDE AVENUE WESTPORT CT 06680 1 0 1 0 Common Stock 2011-02-23 4 D 0 10000 D 0 D Common Stock 2011-02-23 4 D 0 19889044 D 0 I By Lime Rock Partners V, L.P. These shares were disposed of pursuant to an Agreement and Plan of Merger among the Issuer, Seawell Limited and Wellco Sub Company, a wholly-owned subsidiary of Seawell Limited, dated August 12, 2010, as amended. The Reporting Person received 1.15 shares of Seawell Limited common stock for each share of Allis-Chalmers common stock owned. These securities are directly owned by Lime Rock Partners V, L.P. ("Lime Rock"). Mr. Bargach serves as a Director LRP GP V, Inc., which controls the investment decisions of Lime Rock. Mr. Bargach disclaims beneficial ownership of the Common Stock held by Lime Rock except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that Mr. Bargach is the beneficial owner of the securities for purposes of Section 16 or for any other purpose. /s/ Kris Agarwal through POA 2011-02-24