| 摘要 |
A tool for controlling rotation of a bottom hole assembly with respect to a drillstring has a mandrell with a longitudinal groove and a circumferential groove extending therearound and in communication with the longitudinal groove, a locking element extending around and over at least a portion of the grooves, and an actuator cooperative with the locking element for selectively moving the locking element such that locking member extending from the locking element engages either the longitudinal groove ro the circumferential groove relative to a fluid pressure in the drillstring.
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