Method and apparatus for investigating drag and torque loss...

Details Method and apparatus for investigating drag and torque loss... Method and apparatus for investigating drag and torque loss...

E - Fixed Constructions

21

B

354/28, 73/88

E21B 44/00 (2006.01)

Patent

CA 1312217

ABSTRACT Drilling conditions are analyzed by, for example, measuring the tongue applied at the surface to the drill string and the effective torque acting on the drill bit. The applied torque and effective torque are compared to determine torque loss, Likewise, applied weight on the drill string and effective weight acting on the drill bit may he measured and compared to determine drag losses. These measurements and comparisons may be done in real-time to diagnose unfavorable drilling conditions. The torque or weight measurements may be used to calculate a variable coefficient of friction acting on the drilling string. Trends in the torque or weight losses, or in the value of the coefficient of friction, may be observed on a plot of these quantities as a function of depth.

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