| 摘要 |
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 differential pressure and a second valve system releases pressured fluid from the accumulator to the well tubing in response to accumulator-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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