Flexible drill string member especially for use in...

Details Flexible drill string member especially for use in... Flexible drill string member especially for use in...

E - Fixed Constructions

21

B

255/24

E21B 17/22 (2006.01) E21B 17/20 (2006.01)

Patent

CA 1335448

The invention relates to an improved drill string member having at least one spiral groove formed in its outside surface and incorporating a combination of engineering considerations and criteria such that the invention member will have an extraordi- narily high performance capacity in directional drilling. The invention member can make bends in the well on radii as short as 25-50 feet and is particularly suitable for operation together with downhole motor driven bits.

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