Circulation valve and method for operating the same

Details Circulation valve and method for operating the same Circulation valve and method for operating the same

E - Fixed Constructions

21

B

166/41

E21B 34/10 (2006.01) E21B 23/00 (2006.01) E21B 49/00 (2006.01)

Patent

CA 1287567

85.056Al Abstract Pressure operated circulation valve and method for using the same. A cylindrical housing has an open longitudinal passageway therethrough and a circulation port disposed through a wall thereof. A valve mandrel is slidably received in the housing and is moveable between a position in which fluid may be circulated only between the passageway and the exterior of the housing, a position in which fluid may be circulated only between the exterior of the housing and the passageway, and a position in which fluid may not be circulated in either direction. An annular piston is operatively connected to the valve mandrel and has a first side exposed to pressure exterior of the housing and a second side exposed to pressure interior of the housing to permit movement of the valve mandrel to its various positions by application of pressure to the interior and exterior of the housing.

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