Drill pipe for directional drilling

Details Drill pipe for directional drilling Drill pipe for directional drilling

E - Fixed Constructions

21

B

E21B 17/10 (2006.01) E21B 7/04 (2006.01)

Patent

CA 2162698

A drill pipe (10) having first and second end portions (12, 14) at opposite longitudinal ends thereof and a middle portion (16) extending between said first and second end portions; said end portions having a first outside diameter and said middle portion having a second outside diameter less than said first outside diameter; and said drill pipe having a plurality of centraliser means (22, 24 26) spaced along the length of said middle portion. The centralisers have an outside diameter greater than the outside diameter of the middle portion and, preferably, equal to or greater than the outside diameter of die end portions. The centralisers may be formed integrally with the drill pipe and are preferably arcuate in longitudinal cross section and formed with hard-faced spiral flutes.

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