Jar enhancer

Details Jar enhancer Jar enhancer

1993-10-29

1995-07-11

Schoeppel, Roger J.

Wells

With below and above ground modification

Above ground actuating means for below ground device

166178, 175321, E21B 31113

Patent

active

054312213

ABSTRACT:
There is disclosed a tool for enhancing the impact of a jar delivered to an object stuck in a well bore during both upward and downward jars to the stuck object. The tool includes a first tubular member having an lower end connectible to the tubular member of the jar on which the hammer is mounted and a second tubular member connectible to a well pipe string above it and arranged for reciprocation with respect to the first member to form an annular space between them. The space is divided into upper and lower chambers by means of seal rings disposed between the members and the spaces are filled with a compressible fluid which is compressed as the second tubular member is moved in either upward or downward directions.

REFERENCES:
patent: 3735828 (1973-05-01), Berryman
patent: 3834472 (1974-09-01), Perkins
patent: 4200158 (1980-04-01), Perkins
patent: 4361195 (1982-11-01), Evans
patent: 4846273 (1989-07-01), Anderson et al.
patent: 5086853 (1992-02-01), Evans
patent: 5174393 (1992-12-01), Roberts et al.
patent: 5232060 (1993-08-01), Evans

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