Proportional annular B.O.P. controller

Details Proportional annular B.O.P. controller Proportional annular B.O.P. controller

1990-11-02

1991-12-24

Fox, John C.

Valves and valve actuation

Blow-out preventers

137495, E21B 3306

Patent

active

050745182

ABSTRACT:
An annular blowout preventer control system which provides a closing hydraulic pressure to the preventer in proportion to the well-bore pressure with an additive offset equal to the pressure required to energize the preventer. The control system utilizes an annular-type blowout preventer, a hydraulic pressure regulator valve, a pneumatic pressure regulating valve, and necessary controls, all mounted above a standard blowout preventer assembly on a well casing during drilling operations, or on the existing well head during workover operations. The regulator valve includes a diaphragm which operates to establish the initial closing pressure needed to seal the annular blowout preventer. After activation, changes in pressure in the well bore are sensed by the hydraulic pressure regulator valve, which delivers regulated closing pressure to the annular blowout preventer. The regulated closing pressure is proportional to the pressure encountered in the well bore.

REFERENCES:
patent: 3533468 (1970-10-01), Lewis
patent: 3695349 (1972-10-01), Murman et al.
patent: 3887158 (1975-06-01), Polk
patent: 3889959 (1975-06-01), Persson

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