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Energies 2012, 5(2), 181-192; doi:10.3390/en5020181

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 / Revised: 11 January 2012 / Accepted: 17 January 2012 / Published: 30 January 2012
(This article belongs to the Special Issue Natural Gas Hydrate 2011)
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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 methane hydrate; mechanical properties; safe extraction
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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.

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