Remotely adjustable fishing jar and method for using same

Details Remotely adjustable fishing jar and method for using same Remotely adjustable fishing jar and method for using same

1991-06-10

1992-10-20

Novosad, Stephen J.

Wells

Processes

Freeing stuck object, grappling or fishing in well

166178, E21B 31107

Patent

active

051562111

ABSTRACT:
A remotely-adjustable, downhole fishing jar of the mechanical type is used within a well bore for freeing stuck pipe or tools. The jar, while downhole, can be set or reset by an operator at the surface for each firing stroke for any desired impact force within the capability of the finishing string to apply tension to the jar. A selected amount of tension to the fishing string is applied by the operator to set in a mechanical memory of the jar the desired impact force.

REFERENCES:
patent: 3658598 (1972-08-01), Nutter
patent: 4646830 (1987-03-01), Templeton
patent: 4919219 (1990-04-01), Taylor
patent: 5022473 (1991-06-01), Taylor

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