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WELL,ANNULUS PRESSURE CHANGE OPERATED VALVE RELIEF OF FLUID ON ACTUATING PISTON PRESSURE DELAY SIDE
WELL,ANNULUS PRESSURE CHANGE OPERATED VALVE RELIEF OF FLUID ON ACTUATING PISTON PRESSURE DELAY SIDE
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机译:执行活塞压力延迟侧时油井的环形压力变化操作阀的释放
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摘要
An annulus pressure responsive downhole tool includes a housing having a power piston slidably disposed therein. First and second pressure conducting passages communicate a well annulus with first and second sides of the power piston. A retarding device is disposed in the second pressure conducting passage for delaying communication of a sufficient portion of an increase in well annulus pressure to the second side of the power piston for a sufficient time to allow a pressure differential across the power piston to move the power piston from a first position to a second position relative to the housing. A pressure relief valve is communicated with the second pressure conducting passage between the power piston and the retarding device for relieving from the second pressure conducting passage a volume of fluid sufficient to permit the power piston to travel to its second position.
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