| 摘要 |
An anchor (A) is secured in a cased well bore by a setting tool (T) having latch (10) that releasably secures with the anchor (A). A whipstock (27) has surfaces (33) which are engaged with shaft surfaces (32) at the earth's surface to orient the whipstock to face in a desired direction. The whipstock (27) is then lowered into a cased well bore and releasably latched to the anchor (A) by retrievable latch (35) engaged in recess (3) of the anchor and secured against rotation by surface 31d engaged in whipstock latching surface 8 on the anchor (A). A lateral well bore (47) can then be drilled from the cased well bore in the desired direction and at the desired elevation. The whipstock (27) may be connected with a drill string (DS) for lowering into an anchor (A) in the well bore. If desired, an ordinary well string 53 with latch arrangement (77) cooperates with latch arrangement (78) in the whipstock (27) to retrieve the whipstock from the anchor (A), or to position the whipstock in the anchor (A).
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