Thread coupling for drill string members

Details Thread coupling for drill string members Thread coupling for drill string members

1989-07-07

1990-11-06

Arola, Dave W.

Pipe joints or couplings

Screw

285417, 285906, 403343, 29434, F16L 1500

Patent

active

049680684

ABSTRACT:
A thread coupling includes at least one male thread and one female tread. The male thread is arranged upon a spigot that constitutes an integral part of one drill string element. The one drill string element is provided with a contact surface spaced from the free end of the spigot. The female thread is a part of a coupling sleeve that is connected to another drill string element. The coupling sleeve is provided with an internal stop surface. The contact surface of the one drill string element contacts a free end of the sleeve, but the free end of the spigot is spaced slightly from the stop surface by a gap which is eventually eliminated after the threads have become worn-in. The gap is greater than zero, but no greater than 1 mm.

REFERENCES:
patent: 1477855 (1923-12-01), Thurston
patent: 1959919 (1934-05-01), Jones
patent: 3537738 (1970-11-01), Fischer et al.
patent: 3645570 (1972-02-01), Johansson et al.
patent: 4548431 (1985-10-01), Hall et al.
patent: 4687368 (1987-08-01), Eklof et al.
patent: 4707001 (1987-11-01), Johnson

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