水力压裂技术诱导冻融水合物储层增产数值模拟

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A Numerical Study on Freeze-thaw Hydrate Reservoir Exploitation Induced by Fracturing Technology

HAO Guoqiang1，²， HOU Jiaxin²， DUAN Shuo²， LI Xinwang²， SHEN Pengfei2，3*

1.Guangdong Provincial KeyLaboratoryofRenewableEnergy，Guangzhou，Guangdong 5lo640，China 2.SchoolofiningandGeomaticsEngineering，HebeiUniversityofEngineering，Handan，HebeiO56o38，China aboratoryofGasHydrate，inistryfNaturalResourcesQngdaoIstituteofMarineGologyQingdaohadong6627hn

Abstract：Theformationoficephaseduringtheexploitationofnaturalgashydratesinpermafrostregionsincreasesthedifculty ofgas migration within thereservoir.Therefore，enhancinggas productionandreducingiceformationtoaleviate theblockage ofgas migrationinthereservoirarekey isues fortheefcientdevelopmentoffrozen-thawedhydratereservoirs.Basedonthe reservoir parameters of the WellDK-2inthe Qilian Mountain permafrostregion，this paper proposes acombineddevelopment strategyofdepressurizationand hydraulic fracturing.Throughnumericalsimulation，the influenceof thefractureradius （0～5m） andpermeability（ ）on theexploitation effect is systematically evaluated. The research shows that the modified reservoirarea formedbyhydraulic fracturingcanefectivelyinhibiticephaseblockageandacelerate pressure transmission andgasmigration.Whenthefractureradius increasesfrom 0m to 5m ，thecumulative gasproduction over 30 years increases by 219% ，with a contribution rate of 54.8% in the first 1O years，and the overall reservoir decomposition rate is 48.7% . The parameter sensitivity analysis indicates thatthe production enhancement efect slows down when the fracture permeability exceeds 100mD ，andtheoptimal fractureradiusisrecommended tobe 4m .Thisresearch providesatheoretical basisfor theengineringcontroloficeplugging effcts inpermafrosthydrateexploitationandrevealsthesignificantroleofeservoir modification in improving the efficiency of two-phase gas and water migration.

Keywords：gas hydrates;fracturing technology;freeze-thawreservoir;numerical model; QilianMountainpermafrostegion

网络出版地址：http：//link.cnki.net/urlid/51.1718.TE.20250702.1327.005

引言

中国能源供需矛盾日益突出，油气资源自给能力与持续增长的市场需求存在显著缺口，导致对外依存度不断攀升。（剩余20525字）