Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent
1977-11-21
1980-07-08
Purser, Ernest R.
Boring or penetrating the earth
With tool shaft detail
Axially telescoping shaft section
64 23, E21B 1700
Patent
active
042112907
ABSTRACT:
A tool having a low spring rate deformable element and a relatively long stroke is provided. The deformable element comprises a stack of alternating non-deformable metal washers and deformable elastomer rings extending throughout the length of the element chamber. The element washers and rings are substantially out of contact with the side walls of the mandrel and barrel, so that each segment of the element experiences the total shock load. The spline and deformable element are in an oil bath--the annular space between mandrel and barrel is sealed at the upper end by a fixed seal and at the lower end by a floating seal, so that the pressure internal of the chamber is equalized with the bottom hole pressure internal of the tool. Thus pre-loading of the element by the bottom hole pressure is avoided.
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patent: 3660990 (1972-05-01), Zerb et al.
patent: 3980146 (1976-09-01), Sutliff et al.
Anderson Clifford
Mason Leonard
Favreau Richard E.
Purser Ernest R.
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