高温高压作用下致密砂岩三轴压缩试验

doi:10.11743/ogg20170618

Abstract

Abstract: The impact of temperature and confining pressure upon mechanic characteristics and failure modes of the tight quartz sandstone in the second member of the Xuejiahe Formation(T₃x²) in Xinchang gas field of Sichuan Basin,was studied through a conventional triaxial compression test by using a MTS 815 servo-controlled testing machine to simulate subsurface environment of high temperature and high confining pressure.The results show that,when the temperature remains constant,the average values of compressive strength and elastic modulus of quartz sandstone samples increase with growing confining pressure.And when under a constant confining pressure,the value changes in a two-stage way below and over the temperature of 60℃.Before the temperature reaches 60℃,the samples have a quadratic nonlinear decrease in terms of cohension and a nonlinear increase for their internal friction angle,triaxial compression strength,and elastic modulus.When the temperature is higher than 60℃,the above-mentioned parameters vary in a totally reverse direction.The temperature of 60℃ is then the critical point for the mechanical properties of the samples to reverse under joint control of temperature and confining pressure.Within the ranges of pressure from 0 to 100 MPa and temperature from 15 to 150℃,the deformation or failure modes of the samples depends on temperature and confining pressure,with the latter having stronger impact than that of the former.Based on deformation process and failure modes,we roughly categorize the stress-strain curves into five types,which in turn loosely correspond to failure modes of tensile,shear,shear dilatancy,and tensile-shear,respectively.

Key words: confining pressure, failure mode, conventional triaxial compression test, tight quartze sandstone, Xingchang gas field, Sichuan Basin

CLC Number:

TE135

Deng Hui, Zhang Mi, Deng Tonghai, Zhang Qian. A triaxial compression test of tight quartz sandstone under high temperature and high confining pressure[J]. Oil & Gas Geology, 2017, 38(6): 1172-1179.

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A triaxial compression test of tight quartz sandstone under high temperature and high confining pressure

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