Differential pressure test/bypass valve and method for using the

Details Differential pressure test/bypass valve and method for using the Differential pressure test/bypass valve and method for using the

1995-07-14

1997-07-22

Tsay, Frank

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

166320, E21B 4312

Patent

active

056495978

ABSTRACT:
A well tool apparatus (40) comprising a tubular housing (56) and operating mandrel (58) each having autofill ports (74, 76) and bypass ports (128, 130) therein. The well tool apparatus (40) also comprising a normally closed ball valve (96) rotatably disposed within the operating mandrel (58) preventing communication between the upper section (104) and the lower section (106) of the operating mandrel (58) such that internal pressure above the ball valve (96) greater than internal pressure below the ball valve (96) downwardly urges the operating mandrel (58) allowing pressure testing of the pipe string (32) above the ball valve (96) and such that internal pressure below the ball valve (96) greater than internal pressure above ball valve (96) upwardly urges the operating mandrel (58). The well tool (40) further comprising a lower mandrel (150) disposed within the tubular housing (56) below the operating mandrel (58) that communicates with the well bore (16) through rupture disk port (174) such that sufficient well bore pressure will upwardly urge the lower mandrel (150) allowing operating mandrel (58) to slide downward relative to the tubular housing (56) and lock therein.

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patent: 5193621 (1993-03-01), Manke et al.
patent: 5484022 (1996-01-01), Coutte et al.

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