Method and apparatus for measuring three dimensional stress in r

Details Method and apparatus for measuring three dimensional stress in r Method and apparatus for measuring three dimensional stress in r

1993-03-08

1995-01-17

Warden, Robert J.

Measuring and testing

Borehole or drilling

Downhole test

73155, 73781, 73783, 73784, E21B 4700, G01N 1906, G01B 500

Patent

active

053816900

ABSTRACT:
A method for measuring the three dimensional stress in rock surrounding a borehole comprises the steps of cutting slots into the wall of a borehole at different angles relative to the borehole axis so as to effect stress relaxation and strain deformations which are representative of the stresses normal to the angle of the respective slots, and measuring the respective strain deformations adjacent to the slots that are being cut into the borehole wall at a sufficient number of angles to satisfy the mathematical requirement of six independent equations to solve for the three dimensional stress tensors so as to determine the three dimensional stress field surrounding the borehole from measurements in a single borehole.

REFERENCES:
patent: 4491022 (1985-01-01), de la Cruz
patent: 4813278 (1989-03-01), Kosugi
patent: 4899320 (1990-02-01), Hearn et al.
patent: 5113707 (1992-05-01), Herget
Prokhorov; "Strain measuring device and device for investigating strain distribution"; Ind. Lab. (USA), vol. 37(5), May 1971, 775-7.
Bock et al., "A new stress relief concept for in-situ stress measurements in rock and its implementation in two recoverable stressmeters", Proc. 4th Austr. N.Z. conf. on geomechanics, Perth, 1984.

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