Optional up-blow, down-blow jar tool

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

E - Fixed Constructions

21

B

255/29

E21B 4/00 (2006.01)

Patent

CA 1068254

Abstract of the Disclosure An improvement on the tool shown in United States Patent No. 3,853,187, this tool embodies in a single structure inner and outer tele- scopically 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.

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