Low pressure responsive apr tester valve

Details Low pressure responsive apr tester valve Low pressure responsive apr tester valve

E - Fixed Constructions

21

B

166/43

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

Patent

CA 1195237

ABSTRACT OF THE INVENTION An annulus pressure responsive tester valve including a pressure assisted isolation valve which includes a pressure differential metering cartridge to control the rate at which the isolation valve returns to the fluid pressure in the annulus between the wellbore and testing string thereby continuously controlling the rate of expansion the inert gas within the gas chamber and the attendant operation of the tester valve regardless of any temperature effect by cold fluids pumped therethrough.

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