Hydraulic jar device

Details Hydraulic jar device Hydraulic jar device

2007-01-16

2007-01-16

Bagnell, David (Department: 3672)

Wells

Processes

Freeing stuck object, grappling or fishing in well

C166S178000, C175S296000, C175S299000

Reexamination Certificate

active

10250850

ABSTRACT:
An arrangement by a hydraulic jar device, especially for use in underground wells, where the jar device is installed in a pipe string led down into the well, and designed so that e.g. a stuck object in the well may be loosened or broken up by upward or downward percussions from the jar device. The jar device is actuated by increasing the flow of drill fluid. Alternatively, the device is actuated by compression. A valve (27, 37, 38) closes off the flow of drill fluid, whereby a percussion cycle is initiated. The valve is designed so as also to seal during strong lateral accelerations.

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PCT International Search Report dated Apr. 11, 2002, for application No. PCT/NO01/00513.

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