X0101 EFFECT 33 LIVE 2006-12-08 14:00:00

S-3

0000003982 Allis Chalmers Energy Inc. 333-139058 0001373578 Allis-Chalmers GP, LLC 333-139058-13 0001373611 Allis-Chalmers LP, LLC 333-139058-12 0001373580 Allis-Chalmers Management, LP 333-139058-11 0001373577 Allis-Chalmers Production Services, Inc. 333-139058-10 0001373576 Allis-Chalmers Rental Tools, Inc. 333-139058-09 0001373575 Allis-Chalmers Tubular Services, Inc. 333-139058-08 0001373574 AirComp L.L.C. 333-139058-07 0001373573 Mountain Compressed Air, Inc. 333-139058-06 0001373572 OilQuip Rentals, Inc. 333-139058-05 0001373579 Rogers Oil Tool Services, Inc. 333-139058-04 0001023751 STRATA DIRECTIONAL TECHNOLOGY, INC. 333-139058-03 0000875495 TARGET ENERGY, INC. 333-139058-02 0001381747 Petro-Rentals, INC 333-139058-01