Steerable PDC bits require balanced design

Mark Dykstra, Chris Beuershausen Hughes Christensen Houston Jim Norris Hughes Christensen Salt Lake City Roger Fincher Baker Hughes Inteq Houston Michael Ohanian Baker Hughes Inteq Cairo The formation of ledges, as shown here, are a common occurrence of short-gauge, aggressive PDC bits. Such ledges can hang up bottom-hole assemblies, resulting in increased friction and mechanical slip-stick movements (Fig. 6). This PDC bit uses long-gauge pads to promote steerability. Although short gauge bits can kick off much quicker, long-gauge bits help eliminate ledges across the course of a directional well (F...

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