E - Fixed Constructions – 21 – B
Patent
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.
Sabina Dominique
Teixeira Jose
Schlumberger Canada Limited
Smart & Biggar
LandOfFree
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