E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 7/06 (2006.01) E21B 23/01 (2006.01)
Patent
CA 2126553
2126553 9315301 PCTABS00024 A whipstock (14) adapted for insertion into a wellbore through a tubing string (12) having a smaller diameter than the wellbore casing (10) or the open hole portion of the wellbore includes a setting mechanism comprising extendable legs (42, 48, 50) which engage the wellbore wall to bias the whipstock (14) into a position of inclination of the whipstock guide surface (22) relative to the wellbore axis (19). The setting mechanism includes an actuating rod (62) which may be actuated by a conventional downhole tool setting device to extend and retain the legs (42, 48, 50) in their extended position. Cooperating ratchet means (94) and tensionable couplings (82) on the setting mechanism including a frangible coupling part (100) permit actuation of the whipstock to its set position and retrieval of setting device. The whipstock (14) is releasable from the setting device by an adaptor (24) having cooperating ball keys (36) engageable with an adaptor actuating shaft (28) and the upper end of the whipstock body.
Blount Curtis G.
Ottoson Javan D.
Atlantic Richfield Company
Osler Hoskin & Harcourt Llp
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