Optional up-blow, down-blow jar tool

Details Optional up-blow, down-blow jar tool Optional up-blow, down-blow jar tool

1977-12-20

1980-02-05

Purser, Ernest R.

Boring or penetrating the earth

Below-ground impact members

With releasable means to detachably retain telescoping...

175300, 175304, 166178, E21B 110

Patent

active

041868072

ABSTRACT:
An improvement on the tool shown in U.S. Pat. No. 3,853,187, this tool also embodies in a single structure inner and outer telescopically related tubular elements confining a body of operating liquid and comprising a hydraulically retarded up-blow jar, actuated by placing a lifting strain on the drill string, and a simple mechanically retarded down-blow jar actuated optionally by a controlled downward pressure of the drill string on the jar. This jar differs from the patented jar by inverting said structure and actuating said two jar mechanisms respectively by upward and downward movements of said inner element. It also embraces improved specific control devices for said up-blow and down-blow jar mechanisms.

REFERENCES:
patent: 1885043 (1932-10-01), Beck
patent: 2241477 (1941-05-01), Rasmussen
patent: 3685598 (1972-08-01), Nutter
patent: 3853187 (1974-12-01), Sutliff et al.

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