Hydraulic jar

Details Hydraulic jar Hydraulic jar

1995-07-24

1997-01-21

Tsay, Frank

Wells

With jar means for releasing stuck part

175296, 175321, E21B 31107, E21B 414

Patent

active

055952445

ABSTRACT:
There is disclosed a single-acting hydraulic jar having upper and lower detent pressure chambers having upper and lower restrictions, respectively, formed on the inner diameter of its outer tubular member and through which upper and lower detent means carried about the outer diameter of the inner tubular member may be moved in order to impart an up jar.

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patent: 5318139 (1994-06-01), Evans
patent: 5447196 (1995-09-01), Roberts

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