Method of measuring material properties of rock in the wall of a

Details Method of measuring material properties of rock in the wall of a Method of measuring material properties of rock in the wall of a

1983-04-26

1985-04-16

Birmiel, Howard A.

Measuring and testing

Borehole or drilling

Downhole test

73783, 73784, E21B 4902, G01N 3324, G01N 302

Patent

active

045107998

ABSTRACT:
To measure the modulus of elasticity of the rock in the wall of a borehole, a plug is cut in the borehole wall. The plug, its base attached to the surrounding rock, acts as a short column in response to applied forces. A loading piston is applied to the top of the plug and compression of the plug is measured as load is increased. Measurement of piston load and plug longitudinal deformation are made to determine the elastic modulus of the plug material. Poisson's ratio can be determined by simultaneous measurements of longitudinal and lateral deformation of the plug in response to loading. To determine shear modulus, the top of the plug is twisted while measurements are taken of torsional deformation.

REFERENCES:
patent: 3457778 (1969-07-01), Gill et al.
patent: 3992928 (1976-11-01), Thoms
patent: 4155264 (1979-05-01), Bender

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