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Title: Method of measuring material properties of rock in the wall of a borehole

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. Measurements 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.

Inventors:
Issue Date:
OSTI Identifier:
5270319
Application Number:
ON: DE84006176
Assignee:
SNL; EDB-84-037863
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Patent
Resource Relation:
Other Information: Portions are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; ELASTICITY; MEASURING METHODS; POISSON RATIO; ROCKS; SHEAR PROPERTIES; BOREHOLES; PISTONS; CAVITIES; MECHANICAL PROPERTIES; TENSILE PROPERTIES; 440400* - Well Logging Instrumentation

Citation Formats

Overmier, D.K. Method of measuring material properties of rock in the wall of a borehole. United States: N. p., 1984. Web.
Overmier, D.K. Method of measuring material properties of rock in the wall of a borehole. United States.
Overmier, D.K. Sun . "Method of measuring material properties of rock in the wall of a borehole". United States.
@article{osti_5270319,
title = {Method of measuring material properties of rock in the wall of a borehole},
author = {Overmier, D.K.},
abstractNote = {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. Measurements 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {1}
}