Measuring and testing – Borehole or drilling – Downhole test
Patent
1991-06-20
1993-04-27
Williams, Hezron E.
Measuring and testing
Borehole or drilling
Downhole test
166250, E21B 4400
Patent
active
052051633
ABSTRACT:
The invention relates to the determination of the torque T.sub.s 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 T.sub.m of said motor; determining the gear ratio G; determining the moment of inertia Mt of said rotating driving elements; and determining the torque T.sub.s from the values of .gamma., T.sub.m, G and Mt.
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Halsey, Kyllingstad & Kylling "Torque feedback used to cure slip-stick motion"--SPE 18049 1988.
Dombroske George
Kanak Wayne I.
Ryberg John J.
Schlumberger Technology Corporation
Williams Hezron E.
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