Flexible drill string member

Details Flexible drill string member Flexible drill string member

E - Fixed Constructions

21

B

E21B 7/08 (2006.01)

Patent

CA 2756585

A drilling tool that has a flexible shaft so as to be able to make short radius curves while still being able to transmit torque and axial loads. The drilling tool includes a drill shaft for transmitting axial load, comprising a series of coaxial ring members connected together such that adjacent ring members are flexible in an axial plane relative to each other; each ring member being connected to an adjacent ring member by connecting member arranged to transmit torque therebetween; and axial supports extend between adjacent ring members so as to transmit axial loads therebetween.

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