REVERSE CIRCULATION AIR DRILLING CAN REDUCE WELL BORE DAMAGE

Reuben L. Graham, John M. Foster, Paul C. Amick, and J. Stanley Shaw Reuben L. Graham Inc. Charleston, W.Va. Reverse circulation air drilling coupled with an air dryer at the surface helped eliminate formation damage in several gas wells. During reverse circulation drilling, the air flows down the annulus and up the drill pipe (Fig. 1). The following were the three primary objectives of damage-free drilling (DFD): Reducing damage so the initial open flows would more accurately reflect natural

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