Experimental Study on the Mechanical Properties of CH4 and CO2 Hydrate Remodeling Cores in Qilian Mountain
Abstract
:1. Introduction
2. Experimental Methods
2.1. Experimental Apparatus
2.2. Sample Preparation
2.3. Experimental Procedures
3. Results and Discussions
3.1. The Effect of Confining Pressure
3.2. Effect of Temperature
3.3. Effect of Sediment Matrix
3.4. Mohr–Coulomb Strength Theory
4. Conclusions
- (1)
- The stress-strain curves of CO2 hydrate-bearing sediments are consistent with that of CH4 hydrate-bearing sediments. The effects of temperature, confining pressure, and sediment matrices on the stress-strain relationships of CH4 hydrate-bearing sediments are consistent with the effects of those on CO2 hydrate-bearing sediments.
- (2)
- The failure strength of CO2 hydrate-bearing sediments is higher than that of CH4 hydrate sediments under different confining pressures, temperatures, and sediment matrices. The failure strength of the CH4 and CO2 hydrate-bearing sediments first increased and then decreased with an increase in confining pressure, and achieved a maximum at 7.5 MPa.
- (3)
- The cohesion and the internal friction angle of CO2 hydrate-bearing sediments are both higher than those of CH4 hydrate-bearing sediments. The internal friction angle plays a dominant role in the failure strength of CH4 and CO2 hydrate-bearing sediments. In this study, all of the experiments and the theoretical analysis proved the stability of the reservoir in Qilian Mountain under CH4-CO2 replacement.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Luo, T.; Li, Y.; Liu, W.; Sun, X.; Shen, S. Experimental Study on the Mechanical Properties of CH4 and CO2 Hydrate Remodeling Cores in Qilian Mountain. Energies 2017, 10, 2078. https://doi.org/10.3390/en10122078
Luo T, Li Y, Liu W, Sun X, Shen S. Experimental Study on the Mechanical Properties of CH4 and CO2 Hydrate Remodeling Cores in Qilian Mountain. Energies. 2017; 10(12):2078. https://doi.org/10.3390/en10122078
Chicago/Turabian StyleLuo, Tingting, Yanghui Li, Weiguo Liu, Xiang Sun, and Shi Shen. 2017. "Experimental Study on the Mechanical Properties of CH4 and CO2 Hydrate Remodeling Cores in Qilian Mountain" Energies 10, no. 12: 2078. https://doi.org/10.3390/en10122078