X0202 4 2005-12-16 0000003982 Allis Chalmers Energy Inc. ALY 0001227412 PEREZ VICTOR M 5075 WESTHEIMER, SUITE 890 HOUSTON, TX 77056 0 1 0 0 Chief Financial Officer Option to Purchase Common Stock 10.85 2005-12-16 4 A 0 45000 0 A 2015-12-16 Common Stock, par value $.01 per share 45000 45000 D The option is exercisable (a) immediately with respect to 15,000 shares, (b) on December 16, 2006 with respect to 15,000 shares, and (c) on December 16, 2007 with respect to 15,000 shares. Grant under employee stock option plan. /s/ Victor M. Perez 2006-01-19