Heavy wall drill pipe and method of manufacture of heavy wall dr

Details Heavy wall drill pipe and method of manufacture of heavy wall dr Heavy wall drill pipe and method of manufacture of heavy wall dr

1987-03-30

1988-09-20

Thronson, Mark J.

Pipes and tubular conduits

Combined

With end structure

175320, F16L 902

Patent

active

047718110

ABSTRACT:
A substantially homogeneous heavy wall drill pipe and its method of manufacture are disclosed. A cylindrical ingot is placed in a multi-hammer forging press to form the ingot into a drill pipe bar having a central protector portion and upper and lower connector sections each of larger diameter than cylindrical body sections of the drill pipe. Thereafter, the bar is straightened and upper and lower end connectors are machined. Threaded end portions are machined on the connectors and a bore is drilled through the drill pipe bar.

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Darron, "Darron Oil Tools", brochure, copy in S.N. 602,385, paper No. 10, Ex. K-2, prior art date uncertain.

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