Mechanical lockout for pressure responsive downhole tool

Details Mechanical lockout for pressure responsive downhole tool Mechanical lockout for pressure responsive downhole tool

1995-06-07

1997-01-28

Brinson, Patrick

Pipes and tubular conduits

With flow regulators and/or baffles

Restrictors

138 42, 138 43, 138 45, 215251, F15D 114

Patent

active

055970168

ABSTRACT:
An improved mechanical system selectively locks the tester valve of an annulus pressure responsive tester valve in position for an indeterminate number of well annulus pressure cycles. The tester valve also features a multi-range metering cartridge which is operable to meter fluid over a wide range of differential pressures. The metering cartridge provides an adjustable resistance flow path which permits fluid flow across the cartridge. The resistance of the flow path is adjustable by selectively diverting the fluid through a series of fluid flow resistors. Resistance may be increased either by adding a number of flow resistors serially or by adding a single flow resistor which itself provides a greater fluid flow resistance.

REFERENCES:
patent: 4075294 (1978-02-01), Saito et al.
patent: 4515308 (1985-05-01), Jardinier et al.
patent: 4535969 (1985-08-01), Riley
patent: 4669495 (1987-06-01), Boyce
patent: 4774984 (1988-10-01), Peters
patent: 4867198 (1989-09-01), Faust
patent: 5070902 (1991-12-01), Schraub
patent: 5340080 (1994-08-01), Cleland
patent: 5421547 (1995-06-01), Phillips

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