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Experimental Research on the Mechanical Properties of Methane Hydrate-Ice Mixtures
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, China
* Author to whom correspondence should be addressed.
Received: 8 December 2011; in revised form: 11 January 2012 / Accepted: 17 January 2012 / Published: 30 January 2012
Abstract: The mechanical properties of methane hydrate are important to the stability of borehole and methane extraction from a methane hydrate reservoir. In this study, a series of triaxial compression tests were carried out on laboratory-formed methane hydrate-ice mixtures with various methane hydrate contents. Axial loading was conducted at an axial strain rate of 1.33%/min and a constant temperature of −10 °C. The results indicate that: (1) the deformation behavior is strongly affected by confining pressure and methane hydrate content; (2) the failure strength significantly increases with confining pressure when confining pressure is less than 10 MPa, and decreases with methane hydrate content; (3) the cohesion decreases with methane hydrate content, while the internal friction angle increases with methane hydrate content; (4) the strength of ice specimens are higher than that of methane hydrate-ice mixture specimens; Based on the experimental data, the relationship among failure strength, confining pressure and methane hydrate content was obtained, and a modified Mohr-Coulomb criterion considering the influence of methane hydrate content on shear strength was proposed.
Keywords: methane hydrate; mechanical properties; safe extraction
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Li, Y.; Song, Y.; Liu, W.; Yu, F. Experimental Research on the Mechanical Properties of Methane Hydrate-Ice Mixtures. Energies 2012, 5, 181-192.
Li Y, Song Y, Liu W, Yu F. Experimental Research on the Mechanical Properties of Methane Hydrate-Ice Mixtures. Energies. 2012; 5(2):181-192.
Li, Yanghui; Song, Yongchen; Liu, Weiguo; Yu, Feng. 2012. "Experimental Research on the Mechanical Properties of Methane Hydrate-Ice Mixtures." Energies 5, no. 2: 181-192.