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

Metal working – Method of mechanical manufacture – Shaping one-piece blank by removing material

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Details

29DIG18, 72340, 72368, 138172, 138177, 175320, 285333, B23P 1300

Patent

active

046741712

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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