Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent
1995-03-06
1996-12-17
Neuder, William P.
Boring or penetrating the earth
Below-ground impact members
Fluid-operated
166178, E21B 414
Patent
active
055843530
ABSTRACT:
A hydraulic well jar accelerator used in a fishing string in conjunction with a well jar. The well jar accelerator includes inner and outer cylindrical assemblies movable longitudinally relative to each other and having an annular space between the cylindrical assemblies. An annular seal and an expansion sleeve disposed between the cylindrical assemblies are longitudinally spaced relative one another to form an annular liquid chamber in the annular space. The annular liquid chamber confines a hydraulic operating fluid. The volume of the annular liquid chamber can be adjusted by spring-loading the expansion sleeve without relative longitudinal movement of the inner and outer assemblies. The annular liquid chamber is operatively segregated into a main liquid chamber and an expansion liquid chamber. An annular seal body and an annular piston are disposed between the cylindrical assemblies in the annular liquid chamber. The seal body is attached to one of the cylindrical assemblies and has a first end surface. The piston has a first end surface capable of contacting the first end surface of the seal body such that the first and second liquid chambers are in non-fluid communication with each other.
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Chancey Roger D.
Kovar Wayne A.
Peil Archie W.
Bowen Tools, Inc.
Neuder William P.
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