Journal
APPLIED ENERGY
Volume 240, Issue -, Pages 842-850Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2019.02.022
Keywords
Natural gas hydrate; Reservoir reformation; Depressurization; CO2 emulsion; CO2 hydrate cap
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Funding
- National Key Research and Development Program of China [2016YFC0304003, 2017YFC0307302]
- National Natural Science Foundation of China [21636009, 51676207, 51576209, 21522609]
- Research Foundation of China University of Petroleum-Beijing At Karamay [YJ2018B02007]
- Science Foundation of China University of Petroleum, Beijing [2462018BJC004]
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To enhance the exploitation efficiency of natural gas hydrate by decreasing the yield of water, a novel reservoir reformation concept is proposed that involves the reformation of a natural gas hydrate reservoir by constructing an artificial impermeable overlying CO2 hydrate cap. The feasibility of this concept has been demonstrated in this laboratory-scale experiment. After reformation by injecting CO2 emulsion into the permeable overburden, a confined environment with an impermeable CO2 hydrate cap is successfully constructed for depressurization operation. The cap can maintain mechanical stability until the end of production process. With the protection provided by the artificial CO2 hydrate cap, the production efficiency was greatly improved to 83.3% and the water yield is remarkably decreased. Moreover, the optimal CO2/H2O volume ratio of the emulsion for forming the desired CO2 hydrate cap was confirmed to be 1:1. The formation of CO2 hydrate cap can also protect the geological stability of depleted methane hydrate zones and seal a large amount of CO2, which is of both energetic and environmental significance; however, intensive and extensive research should be conducted in the future.
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