Threaded tubular coupling

Details Threaded tubular coupling Threaded tubular coupling

1988-07-25

1991-05-14

Arola, Dave W.

Pipe joints or couplings

Particular interface

Tapered

285383, 285390, F16L 2500

Patent

active

050150170

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.

REFERENCES:
patent: 2054118 (1936-09-01), Childs et al.
patent: 2122757 (1938-07-01), Scott
patent: 2161568 (1939-06-01), Gignoux
patent: 2918315 (1959-12-01), Peter et al.
patent: 4384737 (1983-05-01), Reusser
patent: 4538840 (1985-09-01), DeLange
patent: 4550937 (1985-11-01), Duret
patent: 4600219 (1986-07-01), Yoshida et al.

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