| 摘要 |
An apparatus and method are provided for enhancing fatigue and stress resistance properties of a subterranean well drill pipe string section (10) by providing a helical groove (14) near the pipe to tool joint weld (18). Stresses in and around the top portion (22) of the pipe are redistributed to and absorbed by the helical groove region (17) 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 (10) less prone to fail due to rotational, tensile, and bending stresses.
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