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Application of fracturing technology to increase gas production in low-permeability hydrate reservoir:A numerical study

引用

Chinese Journal of Chemical Engineering 2021年第6期34卷 267-277页

作者： Peng-Fei Shen Gang Li Xiao-Sen Li Bo Li Jin-Ming Zhang State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China School of Resources and Safety Engineering Chongqing UniversityChongqing 400044China Key Laboratory of Gas Hydrate Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640China Guangzhou Center for Gas Hydrate Research Chinese Academy of SciencesGuangzhou 510640China

Low temperature and low permeability are the challenges for the development of hydrate reservoirs in *** ice produced around the production well caused by high depressurization driving force reduces the gas production,and it is necessary to reduce the effect of ice production on gas *** this work,a new combination of fracturing technology and depressurization method was proposed to evaluate the gas production potential at the site DK-2 in Qinghai-Tibet Plateau Permafrost.A relatively higher intrinsic permeability of the fracture zone surround the horizontal production well was created by the fracturing *** simulation results showed that the fracture zone reduced the blocking of production ice to production wells and promoted the propagation of production *** the gas production increased by 2.1 times as the radius of the fracture zone increased from 0 to 4 m in 30 *** half of the hydrate reservoirs were dissociated in 30 years,and greater than 51.7%of the gas production was produced during the first 10 ***,production behaviours were sensitive to the depressurization driving force but not to the thermal *** growth of gas production was not obvious with the intrinsic permeability of the fracture zone higher than 100 m *** effect of ice production on gas production by fracturing technology and depressurization method was limited.

关键词： Gas hydrates fracturing technology Depressurization Low-permeability Permafrost

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