Patent ID: 9605527
Date: 2017-03-28
CPC Classifications: E21B

Claim:
1. An apparatus for mitigation of torsional noise effects on borehole measurements, the apparatus comprising: a bottom hole assembly (BHA); a sleeve having a sensor section, the sleeve rotatably disposed on the BHA; a sensor having at least one component disposed on the sensor section; and a driver coupled to the BHA and configured to rotate at least the sleeve sensor section such that the sleeve sensor section rotates about the BHA at a preset substantially constant rotational speed with respect to the borehole during measurement by the sensor, and wherein the driver comprises at least one of: (i) a motor that rotates the sleeve sensor section independent of the BHA and (ii) a coupler that selectively couples the sleeve with a rotary power source, wherein the driver is configured to maintain the instantaneous rotational speed of the sleeve sensor section at a standard deviation less than 2 percent of an average value of rotational speed.