| 摘要 |
A whipstock and whipstock anchor that allows for select orientation of the whipstock, retrievability of the whipstock, and also resetting of the whipstock in select orientation. The device is for use in drilling a cased subterranean well with a drill bit. The device includes a first means that directs the drill bit. The first means is supported at a desired location along the well casing by a second means. The first means and second means incorporate mechanisms that allow selective orientation of the first means with respect to the second means. The orientation of the second means in its location along the well casing can be accurately detected, and the mechanisms that allow selective orientation of the first means with the second means can be adjusted to provide an accurate, desired orientation for diverting a drill bit or other tool as it contacts the first means. The first means of the device is retrievable and may be run multiple times to the same wellbore location to provide multiple orientations for creating wellbore bends and branching.
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