Double acting accelerator jar

Details Double acting accelerator jar Double acting accelerator jar

1990-06-19

1992-08-18

Neuder, William P.

Wells

With jar means for releasing stuck part

175299, E21B 31107

Patent

active

051390868

ABSTRACT:
A combined accelerator, for accumulating energy, and jar, for sudden release of accumulated energy, for delivering up or down jarring impacts to objects stuck downhole in a wellbore, includes upper and lower tubular members which are telescopically connected within an integral outer tubular housing. The upper tubular member is connected to a pipe or tubing string inserted into the wellbore and cooperates with the outer tubular housing through mechanical spring means so as to accumulate a selected amount of energy to be released as a jarring impact. The lower tubular member is connected to the stuck object and cooperates with the outer housing through spring biased, tapered latch bars, so as to provide a sudden energy releasing means. A threaded adjusting bushing is provided within the outer housing so as to allow selection of a desired amount of spring bias, imposed on the latch bars, thereby providing a convenient field means for controlling the amount of jarring impact imparted to the stuck object.

REFERENCES:
patent: 4844157 (1989-07-01), Taylor
patent: 4846273 (1989-07-01), Anderson et al.
patent: 4865125 (1989-09-01), De Cuir

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