Drilling pipe for directional boring

Details Drilling pipe for directional boring Drilling pipe for directional boring

1997-06-04

1999-12-14

Dang, Hoang

Boring or penetrating the earth

Processes

175 61, 175320, 228168, 2852881, E21B 1702

Patent

active

060004827

ABSTRACT:
An improved drilling pipe for directional boring uses a frictionally welded threaded coupling attached to pipe ends for connecting multiple pipes in a drill string. A stress spreader of the end coupling crosses the frictionally welded region to modify stresses on the weld. A weld flash receiving groove positioned beneath the weld allows the insert to be in place during the inertial welding operation and to be closely coupled to the interior pipe surfaces to receive forces therefrom.

REFERENCES:
patent: 1344221 (1920-06-01), Burns
patent: 2205697 (1940-06-01), Scharpenberg
patent: 3618196 (1971-11-01), Sluetz
patent: 3784235 (1974-01-01), Kessler et al.
patent: 3825083 (1974-07-01), Flarity et al.
patent: 5104152 (1992-04-01), Galfant
patent: 5211100 (1993-05-01), Fuller et al.
patent: 5713423 (1998-02-01), Martin et al.

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