Pressure controlled test valve system for offshore wells

Details Pressure controlled test valve system for offshore wells Pressure controlled test valve system for offshore wells

1976-07-22

1978-05-23

Myracle, Jerry W.

Measuring and testing

Borehole or drilling

Downhole test

166128, E21B 4700

Patent

active

RE0296384

ABSTRACT:
Methods and apparatus for performing a drill stem test of an offshore well utilizing a pressure controlled test valve. The test valve includes a valve element having a transverse pressure area with the high pressure side exposed to the pressure of fluids in the well annulus and the low pressure side subject to the pressure of a compressible fluid medium contained within a chamber in the test valve. The pressure in the chamber is equalized with the hydrostatic head of the well fluids so that at test depth the same pressure is acting on both sides of the transverse pressure area, whereupon this pressure is confined within the chamber. Then a fluid pressure in excess of the hydrostatic head is applied to the well fluids externally of the test valve to develop a pressure difference across the valve element which causes it to shift from closed to open position.

REFERENCES:
patent: 3304776 (1967-02-01), Bennett et al.
patent: 3318145 (1967-05-01), Lynn et al.
patent: 3353605 (1967-11-01), Garrett et al.
patent: 3664415 (1972-05-01), Wray et al.

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