Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent
1996-05-16
1998-08-11
Dang, Hoang C.
Boring or penetrating the earth
Below-ground impact members
Fluid-operated
175321, E21B 31107
Patent
active
057914206
ABSTRACT:
A jar enhancer including a housing in which is telescopically mounted a mandrel, with the mandrel rotationally locked within the housing, and the housing and mandrel being spaced apart by an amount R at one location between them to form a chamber of width R. The upper end of the chamber is closed by a face, at least part of which is a shoulder extending inward from the housing, and the lower end of the chamber is closed by a face, at least part of which is a shoulder extending from the mandrel. The housing is sealed to the mandrel above and below the chamber and a port is provided for filling the chamber with compressible fluid. At least one of the shoulders has width W less than R, such that only a part of one of the faces bounding the chamber moves upon relative movement of the mandrel in relation to the housing. A second chamber of like design is provided in parallel with the first chamber to make a dual chamber, and in a still further jar enhancer, the dual chamber design has metallic springs rather than compressible fluid in the chambers and the shoulders need not occupy a portion of the end faces of the chamber.
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Abstract of U.S. Patent No. 5,174,393, issued Dec. 29, 1992.
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