Pressure responsive safety system for fluid lines

Details Pressure responsive safety system for fluid lines Pressure responsive safety system for fluid lines

1979-06-28

1980-08-05

Novosad, Stephen J.

Wells

Automatic

166 65R, 166 66, 166 67, 137458, 137557, E21B 3416, E21B 4312, F16K 1700, F16K 3700

Patent

active

042157463

ABSTRACT:
An electro-pneumatic or electro-hydraulic safety system for shutting in a well or the like in the event of unusual pressure conditions in the production line of the well. The safety system includes a pressure transducer (30) which senses the flowline pressure and provides a corresponding electrical signal to a digital controller (34). When the signal applied to the controller is outside of a preset range defined between low and high settings of the controller, a control circuit deenergizes a solenoid valve which bleeds fluid from a fluid actuator in order to close a surface safety valve (10). Once the safety valve has closed, the controller is latched out of service and must be manually reset before the safety valve can be opened. For protection of a subsurface safety valve (155), the safety system provides a time delay between opening of the subsurface valve and opening of the surface valve and also between closing of the surface valve and closing of the subsurface valve.

REFERENCES:
patent: 3258027 (1966-06-01), Willis
patent: 3419076 (1968-12-01), Sizer et al.
patent: 3739845 (1973-06-01), Berry et al.
patent: 3768506 (1973-10-01), McGill
patent: 3878863 (1975-04-01), Snyder
patent: 3920040 (1975-11-01), Powell
patent: 4062379 (1977-12-01), Clinton
patent: 4082147 (1978-04-01), Wolff et al.
patent: 4109714 (1978-08-01), Greenlee et al.
patent: 4150721 (1979-04-01), Norwood
patent: 4174729 (1979-11-01), Roark et al.

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