Patent ID: RE39869

Claim:
A drill pipe with enhanced strength and fluid flow capability, the drill pipe comprising: an elongate pipe section having a central axis, a substantially uniform pipe outer diameter, P OD , of from 5 3 / 4 inches to 6 inches along its axial length, and a substantially uniform pipe inner diameter, P ID , along its axial length; a pin tool joint at an axial end of the pipe section, the pin tool joint having external pin threads and a pin shoulder; a box tool joint at an axial end of the pipe section opposing the pin tool joint, the box tool joint having internal box threads for mating engagement with the external pin threads of a mating drill pipe and a box shoulder for engagement with the pin shoulder of the mating drill pipe; the pin tool joint and the box tool joint each having a substantially uniform tool joint outer diameter, TJ OD , along its axial length and a substantially uniform tool joint inner diameter, TJ ID , along its axially axial length; and the drill pipe having a ratio, R, expressed as: 8.8 ≥ P ID + TJ ID TJ OD - P OD ≥ 8.0 .