High torque threaded tool joint for drill pipe and other drill s

Details High torque threaded tool joint for drill pipe and other drill s High torque threaded tool joint for drill pipe and other drill s

1997-12-08

2000-02-29

Nicholson, Eric K

Pipe joints or couplings

Particular interface

Tapered

285333, 285390, F16L 3504, F16B 700

Patent

active

060300043

ABSTRACT:
A double shouldered high torque resistance threaded connection for drill stem components having enhanced resistance to torque forces, tensile loads and material stress and fatigue is disclosed. The tool joint is provided with threads having a 75.degree. included angle between the thread flanks thereof and with generally elliptical root surfaces to minimize material stress and fatigue during operation under high torque and high tensile loads. When made up, the double intrerengaging shoulders of the threaded tool joint are in firm face to face engagement permitting torque forces and tensile loads to propagate through the tool joint in a manner that minimizes bending forces and minimizes high stress concentration so that the resulting service life of the tool joint is significantly enhanced.

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