Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Patent
1994-07-05
1996-07-16
Tsay, Frank S.
Boring or penetrating the earth
With tool shaft detail
Helix or helically arranged structure
285333, E21B 1722, F16L 1500
Patent
active
055358373
ABSTRACT:
An apparatus and method are provided for enhancing fatigue and stress resistance properties of a subterranean well drill pipe string section by providing a helical groove near the pipe to tool joint weld. Stresses in and around the top portion of the pipe are redistributed to and absorbed by the helical groove region of the drill pipe string section, which has a relatively greater resistance to fatigue caused by bending and other stresses, thereby making the drill pipe string section less prone to fail due to rotational, tensile, and bending stresses.
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Grant Prideco, Inc.
Tsay Frank S.
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