Grant Prideco, Inc.

Michael Payne

Jackie E Smith

Edmond I Bailey

A drill pipecomprises an elongate pipe sectionhaving a substantially uniform pipe outer diameterand a substantially uniform pipe inner diameter. A pin tool jointis welded at one end to the pipe section, and a box tool jointis 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, P, the pipe outer diameter, P, the tool joint inner diameter, TJ, and the tool joint outer diameter, TJ. This ratio may be expressed as: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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Katy, TX, United States of America

Michael Payne