Tester valve with silicone liquid spring

Details Tester valve with silicone liquid spring Tester valve with silicone liquid spring

E - Fixed Constructions

21

B

166/41

E21B 34/12 (2006.01) E21B 34/10 (2006.01) E21B 49/00 (2006.01) E21B 49/08 (2006.01) E21B 34/00 (2006.01)

Patent

CA 1213517

ABSTRACT OF THE DISCLOSURE A flow tester valve apparatus includes a housing having a flow passage disposed therethrough with a flow valve disposed therein for opening and closing the flow passage. A power mandrel is disposed in the housing and includes a power piston. The power mandrel is operatively associated with the flow valve for moving the flow valve from its closed position to its open position. A power port transmits pressure from a well annulus to a first side of the power piston. A first chamber is disposed in the housing and filled at least partially with a compressible liquid and a second side of the power piston is in fluid communication with the first chamber. A second chamber is disposed in the housing and includes a float- ing piston which divides the second chamber into a first zone and a second zone. An equalizing port is disposed in the housing for transmitting pressure from the well annulus to the second zone of the second chamber. Pressurizing and depressurizing passages communicate the first chamber with the first zone of the second chamber. A first back pressure check valve and a first flow restrictor are disposed in the pressurizing passage. A second back pressure check valve and a second flow restrictor are disposed in the second passage. The power piston may include a main piston and a booster piston.

422684

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