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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 continuous

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.

대표청구항 ▼

A valve for use in a well testing string located in a wellbore and having a packer arranged for selectively sealing the wellbore isolating that portion of the wellbore above the packer from that portion of the wellbore below the packer to allow the production of fluids from that portion of the wellb

A valve for use in a well testing string located in a wellbore and having a packer arranged for selectively sealing the wellbore isolating that portion of the wellbore above the packer from that portion of the wellbore below the packer to allow the production of fluids from that portion of the wellbore below the packer through said valve in the testing string as well as the introduction of fluids into that portion of the wellbore below the packer through said valve in the testing string, said valve being responsive to changes in the pressure of the fluid in the annulus between the wellbore and the well testing string in that portion of the wellbore above the packer when the packer sealingly engages the wellbore, said valve comprising: valve section means having a valve means therein in a closed position to prevent the flow of fluid through the well testing string, the valve means being responsive to changes in the pressure of the fluid in the annulus to open the valve means to allow the flow of fluid through the well testing string; power section means responsive to changes in the pressure of the fluid in the annulus, the power section means having first means therein adapted to move the valve means of the valve section means to the open position and having resilient means therein adapted to return the valve means of the valve section means to the closed position from the open position in response to a change in the pressure of the fluid in the annulus; and isolation valve means for being continuously responsive substantially without interruption during such time as said valve is located in said wellbore to changes in the pressure of the fluid in the annulus to maintain the resilient means of the power section means at a level of force sufficient to close the valve means of the valve section means regardless of the hydrostatic pressure and temperature of the fluid in the annulus and the pressure ahnd temperature of the fluid in said valve in the testing string.