Measuring and testing – Borehole or drilling – Downhole test
Patent
1980-12-09
1982-11-23
Myracle, Jerry W.
Measuring and testing
Borehole or drilling
Downhole test
E21B 4700
Patent
active
043598986
ABSTRACT:
In accordance with an illustrative embodiment of the present invention, a new and improved weight-on-bit and/or torque measuring apparatus for use in making measurements-while-drilling includes a tubular housing adapted to be attached in the drill string above the bit, the housing having diametrically opposed, radially directed holes that are enclosed to provide a sealed chamber isolated from ambient well fluids. The holes have peripheral wall surfaces to which are attached sensors that measure strain induced by axial and/or torsional loading of the housing. The strain sensors are attached to the walls at locations to be substantially insensitive to strains induced by temperature gradients, and an internal sleeve is utilized in combination with pressure equalization to eliminate spurious stresses in the region of the holes caused by pressure differences inside and outside the housing.
REFERENCES:
patent: 3686942 (1972-08-01), Chatard et al.
patent: 3855853 (1974-12-01), Claycomb
patent: 3864968 (1975-02-01), Anderson
patent: 3929009 (1975-12-01), Lutz et al.
patent: 3968473 (1976-07-01), Patton et al.
patent: 4120198 (1978-10-01), Tanguy et al.
patent: 4186596 (1980-02-01), Bohringer et al.
Leising Larry J.
Tanguy Denis R.
Myracle Jerry W.
Schlumberger Technology Corporation
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