A Study on the Law of Microstructure Changing and Mechanical Properties of Shale

doi:10.11885/j.issn.1674-5086.2020.06.04.01

Abstract

Abstract: Currently, there is less knowledge about the effect of carbon dioxide on the microstructure and mechanical properties of shale; this study aims to obtain some parameters through designing the special experiments for researching the effect of carbon dioxide on shale. Results show that mineral composition cannot be changed after shale soaked by slick water, supercritical carbon dioxide and liquid carbon dioxide, but porosity of shale could be scaled up; as bathing time goes up, Poisson's ratio increases and elastic modulus decreases under uniaxial compression condition, which expresses plasticity characteristics of shale is more obvious; under triaxial compression test, Poisson's ratio goes down and elastic modulus is affected scarcely by those working fluid, which tells brittleness of shale is stronger than before, and carbon dioxide has best performance; tensile strength declines with soaking time goes away, and slick water performs better than carbon dioxide; compressive strength hardly weakened by three types of liquids.

Key words: shale, carbon dioxide, rock mechanics, microstructure, fracturing

CLC Number:

TE312

ZUO Luo, ZHONG Guanyu, JIANG Tingxue, WANG Haitao. A Study on the Law of Microstructure Changing and Mechanical Properties of Shale[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(5): 125-134.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2020.06.04.01

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