Method for reducing friction in drilling operations

Details Method for reducing friction in drilling operations Method for reducing friction in drilling operations

E - Fixed Constructions

21

B

255/24

E21B 7/04 (2006.01) B23K 35/30 (2006.01) E21B 7/10 (2006.01) E21B 17/10 (2006.01) E21B 21/00 (2006.01)

Patent

CA 1286281

Abstract Hardfacing the principal bearing surface of a drill pipe with an alloy having the composition of: 50-65% Cobalt, 25-35% Molybdenum, 1-18% Chromium, 2-10% Silicon and less than 0.1% Carbon reduces the friction between the drill string and the casing or rock. As a result, the torque needed for the rotary drilling operation, especially directional drilling, is decreased. The alloy also provides excellent wear resistance on the drill string while reducing the wear on the well casing.

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