Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent
1977-05-31
1978-09-05
Purser, Ernest R.
Boring or penetrating the earth
Below-ground impact members
Fluid-operated
13761414, 13761421, E21B 110
Patent
active
041112717
ABSTRACT:
There is disclosed a hydraulic jarring device in which an impediment mechanism for controlling the movement of a mandrel with respect to a barrel is exposed to a fluid pressure which is significantly reduced from that pressure generated by the tensional load applied to the jarring device by the hoisting apparatus used to recover an object lodged within a well bore. The impediment mechanism, in one embodiment, is actuated by one or more hydraulically operated plungers slidably mounted within the housing of the jarring device. The plungers cooperate with a control sleeve whose movement is in turn controlled by a metering valve operating at a pressure significantly less than that above the plungers, and having an effect on movement of the sleeve inverse to the tension generated by the hoisting apparatus. The metering valve, in one embodiment, comprises a movable helical plug having a needle nose which associates with a valve seat to control fluid flow. Upon the control sleeve reaching a predetermined position in its stroke, pressures are relieved and a hammer associated with the mandrel impacts against an anvil associated with the barrel.
In another embodiment of the impediment mechanism, the hydraulically operated plungers are replaced by helical springs. Also disclosed is a metering valve wherein the helical plug is replaced by a generally linear hydraulic choke.
REFERENCES:
patent: 3285353 (1966-11-01), Young
patent: 3349858 (1967-10-01), Chenoweth
patent: 3392795 (1968-07-01), Greer
patent: 3399741 (1968-09-01), Monroe
patent: 3429389 (1969-02-01), Barrington
patent: 3491838 (1970-01-01), Wilder
patent: 3566981 (1971-03-01), Love
patent: 3729058 (1973-04-01), Roberts
patent: 3851717 (1974-12-01), Berryman
Kajan Specialty Company, Inc.
Pate III William F.
Purser Ernest R.
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