Mechano-hydraulic double-acting drilling jar

Details Mechano-hydraulic double-acting drilling jar Mechano-hydraulic double-acting drilling jar

1983-12-05

1986-04-15

Novosad, Stephen J.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

175300, 175304, E21B 414

Patent

active

045821488

ABSTRACT:
This invention relates to a double-acting drilling jar characterized by a constantly recharged hydraulic system operating in concert with a mechanical brake to actuate the latter and temporarily inhibit extension of the relatively moving parts utilizing a modest fluid pressure multiplied many-fold so as to exert a holding force far in excess of that which the hydraulic system could impose alone without destroying the seals. The invention also encompasses the virtual elimination of heat build-up through the use of drilling mud as the working fluid in a hydraulic system where once-used fluid is discharged downhole before it gets too hot while, at the same time, being replaced by a fresh supply of cool fluid from the surface. By calling upon the hydraulic system to only exert enough force to actuate the mechanical system, none of the fluid seals need be loaded to anywhere near their capacity.

REFERENCES:
patent: 2710171 (1955-06-01), Bagnell
patent: 3955634 (1976-05-01), Slator et al.
patent: 4109736 (1978-08-01), Webb et al.
patent: 4161224 (1979-07-01), Hostrup
patent: 4456081 (1984-06-01), Newman

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