Multiple impact jar assembly and method

Details Multiple impact jar assembly and method Multiple impact jar assembly and method

2007-11-13

2007-11-13

Gay, Jennifer H. (Department: 3672)

Boring or penetrating the earth

Processes

C175S296000, C175S304000, C166S178000

Reexamination Certificate

active

10942700

ABSTRACT:
A hydraulic jarring tool may be suspended in a well from a wireline, tubular string or drill string, and may be activated to release a tool stuck in the well, or to release the drill string. Each of an upper and lower jarring section include a housing, a piston, a piston biasing member, a fluid metering device and a release mechanism for holding an hammer in a downward position and releasing the hammer to strike an anvil in response to movement of the piston. A timing mechanism results in a timed delay between the impact of one hammer striking the anvil and the other hammer striking the anvil.

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