X0202 4 2005-12-16 0000003982 Allis Chalmers Energy Inc. ALY 0001329712 Hidayatallah Alya 5075 WESTHEIMER, SUITE 890 HOUSTON, TX 77056 0 1 0 0 VP - Planning and Development Option to Purchase Common Stock 10.85 2005-12-16 4 A 0 15000 0 A 2015-12-16 Common Stock, par value $.01 per share 15000 15000 D The option is exercisable (a) immediately with respect to 5,000 shares, (b) on December 16, 2006 with respect to 5,000 shares, and (c) on December 16, 2007 with respect to 5,000 shares. Grant under employee stock option plan. /s/ Alya H. Hidayatallah 2006-01-19