Threaded tubular coupling
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
May 14, 1991
Issued Date -
N/A
app pub date -
Jul 25, 1988
filing date -
Mar 19, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Threaded oil well pipe joint comprising a coupling having internally threaded ends and an intermediate unthreaded area with substantially greater cross section area. The internally threaded ends are made up with externally threaded ends of pipe. Stresses resulting from joining either end of the coupling to a pipe section are absorbed by the intermediate area so that such stresses will not affect the opposing end of the coupling. Because the stresses during makeup of one end do not affect the other end of the coupling, the overall stress levels, pootential for thread damage and leakage are reduced in the joint. As a result, the outside diameter of the coupling may be significantly reduced so that the joint can be run more easily in a restricted diameter well bore.
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Cited Art Landscape
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