Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent
1978-10-10
1980-04-08
Purser, Ernest R.
Boring or penetrating the earth
Below-ground impact members
Fluid-operated
166 91, 166178, E21B 110
Patent
active
041967828
ABSTRACT:
A hydraulic jarring tool includes a temperature compensated hydraulic detent actuation means. 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 provide 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. The hydraulic detent actuation means provides a tripping action to produce the jarring effect. The hydraulic detent actuation includes a sliding sleeve member with an orifice passage that produces a detent action by the slow metering of the hydraulic working fluid. A valve means is positioned in the orifice passage for providing a consistent flow through the sleeve valve to produce the hydraulic detent irrespective of the temperature of the working fluid.
REFERENCES:
patent: 3323550 (1967-06-01), Lee
patent: 3340899 (1967-12-01), Welty et al.
patent: 3716109 (1973-02-01), Griffith
patent: 3949821 (1976-04-01), Raugust
patent: 4111271 (1978-09-01), Perkins
Dresser Industries Inc.
Nichols Jr. Nick A.
Purser Ernest R.
Scott Eddie E.
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