X0202 4 2005-02-02 0000003982 Allis Chalmers Energy Inc. ALY 0001232680 WILDE DAVID 5075 WESTHEIMER, SUITE 890 HOUSTON, TX 77056 0 1 0 0 President and COO Option to Purchase Common Stock 3.86 2005-02-02 4 A 0 200000 A 2015-02-02 Common Stock, par value $0.01 per share 200000 20000 D This option is exercisable (a) immediately with respect to 66,667 shares, (b) on February 2, 2006 with respect to an additional 66,666 shares, and (c) on February 2, 2007 with respect to the remaining 66,667 shares. Grant under employee stock option plan. /s/ David Wilde 2005-02-04