E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/00 (2006.01) F15B 13/02 (2006.01) F15B 15/02 (2006.01) F15B 15/26 (2006.01)
Patent
CA 2552030
An activating mechanism for a hydraulically operable downhole tool provided in a drill string, in which the mechanism is adapted to be incorporated in the drill string and comprises: a tubular housing; a pressure piston mounted for linear reciprocating movement in the housing between first and second end positions a mandrel coupled with the piston for movement therewith between an activating position (Figure 1c) and a non activating position (Figure 1a), in which the mandrel controls the supply of hydraulic pressure fluid to operate the downhole tool when the mandrel is in the activating position; a cam arrangement for controlling the linear movement of the piston and having a cylindrical cam with a cam profile, and a cam follower engageable with the cam profile such that, upon relative rotation taking place between the cam and the cam follower, linear indexing movement of the piston is permitted between the first and second end positions; communication means for applying drill string pressure to the piston to move the piston from the first end position to the second end position when permitted by the cam arrangement; and means biassing the piston in a direction from the second end position to the first end position so that, when drill string pressure is released, the activating mechanism is indexed whereby, upon subsequent pressurisation of the drill string, the cam arrangement does not undergo relative rotation and linear movement of the piston from the first end position is prevented.
Lee Paul Bernard
Ridout & Maybee Llp
LandOfFree
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