Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent
1977-01-06
1978-02-28
Leppink, James A.
Boring or penetrating the earth
Below-ground impact members
Fluid-operated
E21B 110
Patent
active
040760863
ABSTRACT:
A fishing jar is provided for removing stuck objects from a well bore wherein an upward strain on the running string compresses hydraulic fluid in a compression chamber to the amount of the upward jar or impact load desired to be applied to the fish stuck in the well. A pressure relief mechanism is provided to transfer compressed hydraulic fluid within the compression chamber to automatically activate the jarring mechanism when the load on the jar exceeds the recommended operating load. In a preferred form, the relief mechanism is provided in a piston means which has a normally activated flow regulator bypass means therein together with the pressure relief mechanism. The piston means also includes seal means which define cross sectional areas adjacent each end of the piston means that are of different sizes and are responsive to the compressed hydraulic fluid to move it through the pressure relief mechanism and/or the flow regulator by-pass means in the piston means, and thereby move the piston means in the compression chamber to contact and open a valve which substantially instantaneously releases the compressed hydraulic fluid so that a jar or impact is applied to the fish.
REFERENCES:
patent: 3851717 (1974-12-01), Berryman
Baker International Corporation
Leppink James A.
Norvell, Jr. William C.
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