X0202 4/A 2006-11-28 2006-11-30 0 0000003982 Allis Chalmers Energy Inc. ALY 0001141105 NEDERLANDER ROBERT E ET AL 1450 BROADWAY, 20TH FLOOR NEW YORK NY 10018 1 0 0 0 Common Stock 2006-11-29 4 S 0 4000 18.5 D 13862 I By QEN Corp. The sole purpose of this amendment is to correct 4,000 shares that were previously reported on the Form 4 filed November 30, 2006 as sold out of the shares the Reporting Person owned directly, to correctly reflect that the 4,000 shares were sold out of the shares the Reporting Person owns indirectly through QEN Corp. The Reporting Person owns 80% of the issued and outstanding stock of QEN Corp. /s/ Robert Nederlander 2006-12-06