Flexible drill shaft

Details Flexible drill shaft Flexible drill shaft

E - Fixed Constructions

21

B

E21B 17/20 (2006.01) E21B 17/22 (2006.01) E21B 7/06 (2006.01)

Patent

CA 2628981

A flexible drill shaft for drilling lateral boreholes comprising: a helical outer wire coil spring; and at least one inner helical wire coil spring residing concentrically within the outer coil spring, with the coils of adjacent springs having an opposite pitch; wherein the wire forming each helical spring has a cross section such that when the drill shaft is in a straight alignment there is planar contact between adjacent coils of the spring.

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