Apparatus for measuring weight, torque and side force on a drill

Details Apparatus for measuring weight, torque and side force on a drill Apparatus for measuring weight, torque and side force on a drill

1989-08-07

1990-09-25

Chapman, John

Measuring and testing

Borehole or drilling

Downhole test

175 40, E21B 4700

Patent

active

049585177

ABSTRACT:
Apparatus is presented for measuring weight, torque and side force (bending) on a drill bit for oil and gas well drilling. This apparatus includes radial holes which do not pass completely through the wall of the drill collar sub, but instead, pass only partially through the wall of the drill collar sub. Strain gages are located in the partial radial openings. These strain gages measure each of the three parameters of weight, torque and bending. Each partially formed hole is sealed by a plug and retained in place by a retaining ring. For torque and bending measurements, the strain gages are arranged with symmetry of position between diametrically opposed holes. The strain gages are positioned in an array which departs from symmetry of position to minimize errors in the weight measurement caused by pressure changes in the drilling fluid.

REFERENCES:
patent: 3864968 (1975-02-01), Anderson
patent: 4359898 (1982-11-01), Tanguy et al.
patent: 4715451 (1987-12-01), Bseisu et al.

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