Method and apparatus for determining the torque applied to a...

Details Method and apparatus for determining the torque applied to a... Method and apparatus for determining the torque applied to a...

E - Fixed Constructions

21

B

E21B 44/00 (2006.01) E21B 44/04 (2006.01) E21B 45/00 (2006.01) E21B 47/00 (2006.01) G01L 3/00 (2006.01)

Patent

CA 2046229

ABSTRACT METHOD AND APPARATUS FOR DETERMINING THE TORQUE APPLIED TO A DRILLSTRING AT THE SURFACE The invention relates to the determination of the torque Ts acting at the surface in a drillstring while drilling a borehole, the drillstring being rotated by rotating driving elements which include an electrical motor with an output shaft. The method comprises the steps of: measuring the angular acceleration .gamma. of said shaft; measuring the torque Tm of said motor; determining the gear ratio G; determining the moment of inertia Mt of said rotating driving elements; and determining the torque Ts from the values of .gamma., Tm, G and Mt.

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