E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/42
E21B 34/10 (2006.01) E21B 34/12 (2006.01) E21B 49/00 (2006.01) E21B 49/08 (2006.01)
Patent
CA 1195236
Abstract of the Disclosure A recloseable circulation valve includes a cylindrical housing having a central flow passage disposed therethrough and having a power port and a circulation port disposed through a wall thereof. An operating mandrel is telescopingly received in the upper end of the housing. A valve sleeve is slidably received in the housing and movable to open and close the cir- culation port. A power mandrel is disposed in the housing and is connected to the valve sleeve for moving the valve sleeve from an initial position toward an open position. A mandrel lock is pro- vided for locking the operating mandrel and power mandrel together after the power mandrel moves the valve sleeve from its initial position. The power mandrel and valve sleeve are ini- tially held in their initial positions by a shear pin assembly. After the power mandrel moves the valve sleeve upward toward its open position, and the power mandrel is locked to the operating mandrel by the mandrel lock, the circulation valve may be sub- sequently repeatedly opened and closed by picking up weight from or setting down weight on the circulation valve. Methods of testing and treating subsurface formations utilizing such a cir- culation valve are also disclosed.
426184
Company Halliburton
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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