Wells – Above ground apparatus – Well caps or casing heads
Patent
1992-06-29
1994-03-22
Dang, Hoang C.
Wells
Above ground apparatus
Well caps or casing heads
137460, 137462, 1375133, 166 91, 166319, 166324, E21B 3408
Patent
active
052955346
ABSTRACT:
A well pressure monitoring system in which a hydrocarbon fluid is being produced through a Christmas tree or similar flow controller apparatus. Well pressure is transmitted through a tap-off communicated to a pressure sensor. The pressure is thereafter transmitted to a base or control station. To avoid a major uncontrolled flow of the hydrocarbon from the well in the event of inadvertent breakage or accident to the monitoring system, an excess flow control valve is positioned between the well flow and the pressure sensor. The excess flow valve functions to cut off fluid flow, but is provided with a vent passage in the valve actuator through which a minimal amount of the hydrocarbon can escape. When the damage to the monitoring system has been overcome, the vent passage will allow a downstream pressure build-up in the closed system, thus permitting a biasing spring to automatically reset the valve to open and operable position, thereby stabilizing the pressure acting on the actuator.
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G. M. Raulins, SPE 3491, 4 pages.
Dang Hoang C.
Gillespie Ronald G.
O'Loughlin James J.
Texaco Inc.
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