| 摘要 |
<p>VARIABLE ORIFICE SLEEVE VALVE HYDRAULIC JAR TOOL A hydraulic jarring tool includes a system for externally adjusting the orifice size of the sleeve valve flow passage. The jarring tool includes an outer member and an inner member telescopically arranged. Spline means between said outer member and said inner member transmit torque. A hammer and anvil system provides a jarring effect upon actuation of the tool. An upper seal and lower seal provide a fluid seal between said outer member and said inner member. A working fluid is maintained in a working fluid chamber between the upper and lower seals. A detent means provides a tripping action to produce the jarring effect. The detent means includes an orifice plate that is rotatable to change the fluid restriction. An exterior port allows a wrench or tool to be inserted to rotate the orifice plate to provide selectable orifice passages that produce the detent action by the slow metering of hydraulic working fluid.</p> |
