Pressure-controlled accumulator charging valve system for...

Details Pressure-controlled accumulator charging valve system for... Pressure-controlled accumulator charging valve system for...

E - Fixed Constructions

21

B

166/41, 138/94

E21B 43/00 (2006.01)

Patent

CA 1268704

Abstract of the Disclosure Apparatus for pressure charging pressure accumulators in apparatus downhole in a well, wherein a first valve system admits pressured fluid into an accumulator from a well tubing such as a drill string in response to well tubing - accumulator differen- tial pressure and a second valve system releases pressured fluid from the accumulator to the well tubing in response to accumu- lator - well tubing differential pressure. The apparatus utilizes valve assemblies called "fuses", which can be used for accumulator pressure adjustments in lower well tubing pressure ranges and which close in response to higher fluid pressures in the well tubing so that well tubing pressure can be used to do work in the well such as to operate a piston actuator, or the like.

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