Sleeve valve hydraulic jar tool

Details Sleeve valve hydraulic jar tool Sleeve valve hydraulic jar tool

1978-09-05

1980-01-01

Pate, III, William F.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

291567A, E21B 110

Patent

active

041811860

ABSTRACT:
A hydraulic jarring tool includes a reliable and closely repeating 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 detent actuation means provides a tripping action to produce the jarring effect. Annular grooves in a lower stop member cooperate with a sliding sleeve element to provide orifice passages that produce the detent action by the slow metering of the hydraulic working fluid. Large bypass holes through the sleeve element allow the working fluid to flow rapidly in the opposite direction to recock the jar tool.

REFERENCES:
patent: 3088533 (1963-05-01), Sutliff
patent: 3716109 (1973-02-01), Griffiths
patent: 3729058 (1973-04-01), Roberts
patent: 3889766 (1975-06-01), Sutliff
patent: 3987858 (1976-10-01), Slator

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