| 摘要 |
PCT No. PCT/GB84/00369 Sec. 371 Date Aug. 29, 1985 Sec. 102(e) Date Aug. 29, 1985 PCT Filed Oct. 31, 1984 PCT Pub. No. WO85/01983 PCT Pub. Date May 9, 1985.A wedging assembly for steering or branching a borehole comprises a wedge defining the steering or branching angle, a locking device for locking the wedge in a desired position, and an actuator for actuating the locking device, the locking device including cooperable male and female locking members which are relatively moveable to cause an annular locking surface on the female member to lock firmly about the wall of the borehole.
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