Variable hydraulic resistor jarring tool

Details Variable hydraulic resistor jarring tool Variable hydraulic resistor jarring tool

1978-08-25

1979-12-18

Leppink, James A.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

E21B 106, E21B 110

Patent

active

041790022

ABSTRACT:
A hydraulic jarring tool includes a system for externally adjusting the sleeve valve flow rate mechanically. 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 fluid seals 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 a sleeve valve with an internal needle valve that is adjustable to change the fluid restriction. An exterior port allows a wrench or tool to be inserted to adjust the needle valve and provide a selectable size passage that produces the detent action by the slow metering of hydraulic working fluid.

REFERENCES:
patent: 2678805 (1954-05-01), Sutliff
patent: 2690226 (1954-09-01), Comstock
patent: 3087559 (1963-04-01), Hazen et al.
patent: 3729058 (1973-04-01), Roberts
patent: 3735827 (1973-05-01), Berryman
patent: 3797591 (1974-03-01), Berryman

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