| 摘要 |
A system and method for detecting the wear of a roller bit bearing on a roller drill bit body where the roller bit has a plurality of cutting elements and is rotatably attached to the roller drill bit body at the bearing. In the invention, a rotation impeder is in between the roller bit and roller drill bit body and upon uneven rotation of the roller bit which indicates that the roller bit bearing may fail, the rotation impeder impedes the rotation of the roller bit. The drill rig operator at the surface can cease drilling operations upon detection of the cessation of rotation of the roller bit. The rotation impeder can also be seated in a drilling fluid outlet and cause a detectable loss in drilling fluid pressure when dislodged to otherwise cease rotation of the roller drill bit.
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