Experimental Study on the Mechanical Properties of CH 4 and CO 2 Hydrate Remodeling Cores in Qilian Mountain

Tingting Luo, Yanghui Li, Weiguo Liu, Xiang Sun and Shi Shen
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Tingting Luo: Key Laboratory of Ocean Energy Utilization and Energy Conservation of the Ministry of Education, Dalian University of Technology, Dalian 116024, China
Yanghui Li: Key Laboratory of Ocean Energy Utilization and Energy Conservation of the Ministry of Education, Dalian University of Technology, Dalian 116024, China
Weiguo Liu: Key Laboratory of Ocean Energy Utilization and Energy Conservation of the Ministry of Education, Dalian University of Technology, Dalian 116024, China
Xiang Sun: Key Laboratory of Ocean Energy Utilization and Energy Conservation of the Ministry of Education, Dalian University of Technology, Dalian 116024, China
Shi Shen: Key Laboratory of Ocean Energy Utilization and Energy Conservation of the Ministry of Education, Dalian University of Technology, Dalian 116024, China

Energies, 2017, vol. 10, issue 12, 1-17

Abstract: The CH 4 -CO 2 replacement method has attracted global attention as a new promising method for methane hydrate exploitation. In the replacement process, the mechanical stabilities of CH 4 and CO 2 hydrate-bearing sediments have become problems requiring attention. In this paper, considering the hydrate characteristics and burial conditions of hydrate-bearing cores, sediments matrices were formed by a mixture of kaolin clay and quartz sand, and an experimental study was focused on the failure strength of CH 4 and CO 2 hydrate-bearing sediments under different conditions to verify the mechanical reliability of CH 4 -CO 2 replacement in permafrost-associated natural gas deposits. A series of triaxial shear tests were conducted on the CH 4 and CO 2 hydrate-bearing sediments under temperatures of ?20, ?10, and ?5 °C, confining pressures of 2.5, 3.75, 5, 7.5, and 10 MPa, and a strain rate of 1.0 mm/min. The results indicated that the failure strength of the CO 2 hydrate-bearing sediments was higher than that of the CH 4 hydrate-bearing sediments under different confining pressures and temperatures; the failure strength of the CH 4 and CO 2 hydrate-bearing sediments increased with an increase in confining pressure at a low confining pressure state. Besides that, the failure strength of all hydrate-bearing sediments decreased with an increase in temperature; all the failure strengths of the CO 2 hydrate-bearing sediments were higher than those of the CH 4 hydrate-bearing sediments in different sediment matrices. The experiments proved that the hydrate-bearing sediments would be more stable than that before CH 4 -CO 2 replacement.

Keywords: CH 4 -CO 2 replacement; hydrate-bearing sediments; remodeling cores; stress-strain curves; failure strength; cohesion force (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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