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...gamma ray, resistivity, or porosity), drilling parameters (e.g., downhole torque, weight on bit, temperature, or pressure), or geophysical information (look

...relatively homogeneous formations or when anticipating higher than normal torque loads. This system can also be especially attractive when rig time is the l ...ned to cut cores up to 5.25 in. in diameter. Heavy duty threads allow more torque to be applied to the bit and improve the margin of safety against tool fail

* Weight and torque on bit

* Rotary torque (in ft-lb)

* ''Reduction of torque and drag problems''—Since oil is the continuous phase, the borehole and t