A modified true triaxial apparatus for measuring mechanical properties of sandstone coupled with CO 2 ‐H 2 O biphase fluid

Shaobin Hu, Xiaochun Li, Bing Bai, Lu Shi, Mingze Liu and Haiqing Wu

Greenhouse Gases: Science and Technology, 2017, vol. 7, issue 1, 78-91

Abstract: Mechanical behaviors of rock under biphase or multiphase fluids conditions are key scientific issues currently in geomechanics and geotectonics. In this work, we conducted a series of triaxial experiments using a semipermeable separator method to form a specific composition pressure; we comparatively investigated the mechanical behaviors of sandstone in the conditions of monophase fluids CO 2 /N 2 /H 2 O and biphase fluid CO 2 ‐H 2 O; and we analyzed the strength, elasticity modulus and brittleness of sandstones at different porous fluid conditions. The results showed that the selective adsorption of mineral compositions of sandstone on CO 2 /N 2 /H 2 O has obvious effects on mechanical behaviors. The linear elastic modulus of CO 2 ‐H 2 O coupled sandstone was slightly greater than that of H 2 O‐bearing sandstone, but significantly less than that of CO 2 ‐ or N 2 ‐bearing sandstone. Compared to H 2 O, CO 2 or N 2 containing sandstones are mainly subjected to the brittle failure and exhibit no obvious plastic deformation. Overall, the study analyzed the mechanisms of physicochemical interactions of fluid with sandstone minerals from the micro‐scales, and revealed the mechanical mechanism between fluids and mineral particles, and established a new effective stress model of sandstone under CO 2 ‐H 2 O biphase condition. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd.

Date: 2017
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