Rotary jar

Details Rotary jar Rotary jar

1996-03-01

1997-09-23

Bagnell, David J.

Boring or penetrating the earth

Below-ground impact members

Resiliently biased

166178, 175304, E21B 31107

Patent

active

056694580

ABSTRACT:
A rotary jar is described that is part of a drill string and includes a mandrel and an anvil that move longitudinally in opposite directions to deliver a sharp upward or downward blow that is transmitted to a fish, which may be a separate tool or a portion of the drill string that is stuck in the well bore in an effort to free the fish or the stuck portion of the drill pipe. The mandrel carries rollers that move through longitudinally extending grooves when the jars are tripped. In the jars of this invention, the grooves follow a serpentine path to cause the mandrel to transmit a torsional force on the fish to try to rotate the fish as well as providing an upward or downward blow.

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patent: 4526241 (1985-07-01), Anders
patent: 4665998 (1987-05-01), Burton
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