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

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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)

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.

Suggested Citation

  • Tingting Luo & Yanghui Li & Weiguo Liu & Xiang Sun & Shi Shen, 2017. "Experimental Study on the Mechanical Properties of CH 4 and CO 2 Hydrate Remodeling Cores in Qilian Mountain," Energies, MDPI, vol. 10(12), pages 1-17, December.
  • Handle: RePEc:gam:jeners:v:10:y:2017:i:12:p:2078-:d:121957
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    References listed on IDEAS

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    1. Bei Liu & Heng Pan & Xiaohui Wang & Fengguang Li & Changyu Sun & Guangjin Chen, 2013. "Evaluation of Different CH 4 -CO 2 Replacement Processes in Hydrate-Bearing Sediments by Measuring P-Wave Velocity," Energies, MDPI, vol. 6(12), pages 1-13, November.
    2. Zhao, Jiafei & Yu, Tao & Song, Yongchen & Liu, Di & Liu, Weiguo & Liu, Yu & Yang, Mingjun & Ruan, Xuke & Li, Yanghui, 2013. "Numerical simulation of gas production from hydrate deposits using a single vertical well by depressurization in the Qilian Mountain permafrost, Qinghai-Tibet Plateau, China," Energy, Elsevier, vol. 52(C), pages 308-319.
    3. Zhao, Jiafei & Zhu, Zihao & Song, Yongchen & Liu, Weiguo & Zhang, Yi & Wang, Dayong, 2015. "Analyzing the process of gas production for natural gas hydrate using depressurization," Applied Energy, Elsevier, vol. 142(C), pages 125-134.
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