High efficiency drill pipe

Details High efficiency drill pipe High efficiency drill pipe

2007-10-09

2007-10-09

Safavi, Michael (Department: 3673)

Pipe joints or couplings

Particular interface

Tapered

C285S355000, C285S390000

Reissue Patent

active

10459359

ABSTRACT:
A drill pipe10comprises an elongate pipe section12having a substantially uniform pipe outer diameter18and a substantially uniform pipe inner diameter20. A pin tool joint14is welded at one end to the pipe section, and a box tool joint16is welded to the other end of the pipe section. Each of the pin and box tool joints includes a thread for mating engagement and preferably first and second shoulders. The drill pipe has a ratio, R, which takes into consideration the pipe inner diameter, PID, the pipe outer diameter, POD, the tool joint inner diameter, TJID, and the tool joint outer diameter, TJOD. This ratio may be expressed as:R=(PID+TJID)(TJOD-POD).According to the present invention, this ratio is greater than 8.0, and is preferably from 8.1 to 8.5, thereby providing a drill pipe with desired strength and fluid flow capabilities.

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