Bypass valve

Details Bypass valve Bypass valve

1979-05-16

1981-08-04

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Destructible element

137 70, 166323, E21B 4700

Patent

active

042817153

ABSTRACT:
A bypass valve for use with an oil well testing string is disclosed which includes a spring loaded check valve which is normally in the closed position. If pressure in the interior of the test string is higher than the pressure in the well annulus, the check valve means opens until the interior pressure is equalized with the well annulus pressure. When the interior string pressure is reduced to that pressure present in the well annulus, the check valve means returns to the closed condition. The check valve means contains frangible shear means which shear when the well annulus pressure exceeds the interior string pressure by a predetermined amount. The check valve means then moves to the locked closed condition. The bypass valve disclosed is intended for use in a testing string for an oil well, and is to be placed in the testing string below a normally closed tester valve and above a seal assembly for insertion into sealing engagement with a preset production type packer. This bypass valve relieves elevated internal pressure in the testing string generated while the seal assembly is further lowered into the packer.

REFERENCES:
patent: 3822745 (1974-07-01), Mott
patent: 3970147 (1976-07-01), Jessup et al.
patent: 3981360 (1976-09-01), Marathe
patent: 4044829 (1977-08-01), Jessup
patent: 4105075 (1978-08-01), Helmus

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