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论文类型：期刊论文

发表时间：2014-01-01

发表刊物：AMERICAN MINERALOGIST

收录刊物：SCIE、Scopus

卷号：99

期号：1

页面范围：178-183

ISSN号：0003-004X

关键字：Carbon dioxide hydrate; mechanical behavior; CH4-CO2 replacement technology; triaxial tests

摘要：Understanding the mechanical behaviors of carbon dioxide/methane hydrate-bearing sediments is essential for assessing the feasibility of CO2 displacement recovery methods to produce methane from hydrate reservoirs. In this study, a series of drained triaxial compression tests were conducted on synthetic carbon dioxide hydrate-bearing sediments under various conditions. A comparative analysis was also made between carbon dioxide and methane hydrate-bearing sediments. The stress-strain curves, shear strength, and the effects of hydrate saturation, effective confining stress, and temperature on the mechanical behaviors were investigated. Our experimental results indicate that the newly formed carbon dioxide hydrate would keep the reservoir mechanically stable when CH4-CO2 gas exchange took place in a relatively short period of time and spatially well distributed in the pore space. Experiments of CO2 injection in methane hydrate-bearing sediments are necessary to confirm this hypothesis.