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| Influence of well pattern and injection-production parameters on gas hydrate recovery via CO2 injection and replacement method |
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SUN Zhixue1,2, ZHU Xuchen1, ZHANG Jianguo1,3, ZHANG Lei3, DU Jinwen1, LIU Lei1, HE Chuqiao1
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(1.School of Petroleum Engineering in China University of Petroleum(East China), Qingdao 266580, China;2.Key Laboratory of Unconventional Oil & Gas Development(China University of Petroluem(East China)), Ministry of Education, Qingdao 266580, China;3.Drilling Technology Research Institute, Shengli Petroleum Engineering Company, SINOPEC, Dongying 257017, China)
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| Abstract: |
| A combination of depressurization and CO2 injection to replace natural gas was proposed for the exploitation of natural gas hydrate reservoirs. In this study, a heterogeneous reservoir model was established for numerical simulation, and the effect of well pattern, well spacing, gas (CO2) injection rate, bottom hole pressure of production well and initial hydrate saturation on natural gas production were investigated. The simulation results show that a nine-spot well pattern has the maximum cumulative CH4 production and CO2 storage factor in comparison with five-spot and seven-spot well patterns, and a large well spacing is beneficial to increase gas production, in which high storage factor and replacement efficiency can be achieved. In addition, at 2.5 MPa of bottom hole pressure, optimum cumulative CH4 production and CO2 replacement efficiency can be obtained. CO2 replacement mainly occurs within the control range of the well pattern. The reservoir temperature in CH4 replacement area rises 5-10 ℃, and it can drop 3-5 ℃ in CO2 unswept areas. |
| Key words: natural gas hydrate CO2 replacement decompression storage factor |
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