Method and apparatus for bottom hole measurement

Details Method and apparatus for bottom hole measurement Method and apparatus for bottom hole measurement

1985-10-23

1987-05-05

Leppink, James A.

Boring or penetrating the earth

Automatic control

Of advance or applied tool weight

175 45, 175 61, E21B 708, E21B 4712

Patent

active

046624589

ABSTRACT:
A method and apparatus for obtaining complete loading on a drill bit at the end of a drill string in a borehole employ at least three rosette strain gauges uniformly disposed on an instrument sub to measure torque and axial force on the sub, two bending moments in mutually perpendicular directions, and two shear forces in mutually perpendicular directions. These measurements are used to obtain torque on bit, weight on bit, two side forces on the bit normal to each other, and two bending moments on the bit normal to each other which, in turn, can be used to control the bit movement.

REFERENCES:
patent: 4303994 (1981-12-01), Tanguy
patent: 4324297 (1982-04-01), Denison
patent: 4445578 (1984-05-01), Millheim
patent: 4479564 (1984-10-01), Tanguy
"Three-Dimensional Bottomhole Assembly Model Improves Directional Drilling", by P. N. Jogi, T. M. Burgess and J. P. Bowling, IADC/SPE 14768, 1986 IADC/SPE 1986 Drilling Conference.

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