期刊
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
卷 149, 期 -, 页码 56-64出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.petrol.2016.09.040
关键词
Gas hydrate; CO2; Direct shear; Sediment; Mechanical property
资金
- National Natural Science Foundation of China [51274177, 51239010, 41572295]
- Program for New Century Excellent Talents in University [NCET-13-1013]
- Fok Ying Tong Education Foundation [132019]
- Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) [CUG120112]
Understanding the mechanical behaviours of gas hydrate-bearing sediments (GHBS) is important for their associated applications in wellbore stability, stratum deformation during exploitation, geological disaster prevention, and the risk assessment of replacing CH4 with CO2 in hydrate reservoirs and CO2 sequestration in oceans. However, triaxial tests on mechanical properties of GHBS are taxing and time-consuming. Here, we presented an easy and efficient way to evaluate these behaviours by using a self-developed direct shear apparatus. Then a series of direct shear tests on GHBS represented by CO2 hydrate-bearing silt were performed to investigate their mechanical behaviours and strength indices by changing the axial pressure, CO2 hydrate saturation, shear rate and hydrate synthesis temperature. Our results indicate that CO2 hydrate significantly strengthens specimens by cementing silt grains. In addition, when hydrate saturation increases, the cohesions are enhanced from 0.09 to 2.39 MPa, and the internal friction angles increase and decrease at the range from 28.6 degrees to 43.3 degrees under the experimental conditions. These findings have direct implications for evaluating the stability and safety of natural gas hydrate reservoirs, CO2 replacement to extract CH4 and CO2 sequestration.
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