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... assemblies. None of these down-hole motors were accepted by the oilwell drillers because they did not compete economically with the conventional rotary drilling method. Bits, drill pipe, collars and drilling fluids were improved to keep up with increasing penetration rates and greater depths that were...

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... a simpler static solution. It appeared on the basis of the preceding points that an annular pressure technique was Unreliable from an engineering standpoint and that a drill-pipe pressure technique should be used. This introduces a fourth point which 82 ABNORMAL PRESSURE CONTROL-MAXIMUM CASING PRESSURE FROM...