2023·11基础研究42ModernChemicalResearch当代化工研究祁连山冻土区水合物多井系统降压联合热盐水增产数值模拟＊张婷婷1,2李波1,2*韦文娜1,2（1.重庆大学煤矿灾害动力学与控制国家重点实验室重庆4000442.重庆大学资源与安全学院重庆400044）摘要：基于模拟软件TOUGH+HYDRATE对祁连山冻土区水合物藏的产气行为进行数值研究，采用五点水平井降压联合热盐水注入开采水合物藏，分析了储层关键物性参数的空间演化规律和产气产水以及能量效率等的变化规律。结果表明，生产前期热盐水的注入加快了产气速率。但后期热盐水可流经储层从生产井产出，限制了抑制剂在储层中的作用范围，使得水合物主要在降压和热刺激的作用下分解，产气速率也随之降低。此外，热盐水的注入可有效避免因二次水合物和冰的生成而抑制产气的现象。关键词：天然气水合物；数值模拟；热盐水增产；降压；水平井中图分类号：TE文献标识码：ADOI：10.20087/j.cnki.1672-8114.2023.11.013NumericalStudyonHotBrineStimulationCombinedDepressurizationofHydrateReservoirsinaMulti-WellSysteminPermafrostAreaofQilianMountainZhangTingting1,2,LiBo1,2*,WeiWenna1,2(1.StateKeyLaboratoryofCoalMineDisasterDynamicsandControl,ChongqingUniversity,Chongqing,4000442.SchoolofResourcesandSafetyEngineering,ChongqingUniversity,Chongqing,400044)Abstract：BasedonthesimulationsoftwareTOUGH+HYDRATE,thegasproductionbehaviorofhydratereservoirsintheQilianMountainpermafrostregionwasnumericallystudied.Thefive-pointhorizontalwelldepressurizationcombinedwithhotbrineinjectionwasusedtoexploithydratedeposits.Thespatialevolutionlawofkeyphysicalparametersofreservoirandthevariationlawofgas,waterproductionandenergyefficiencyareanalyzed.Theresultsshowthattheinjectionofhotbrineintheearlystageacceleratesthegasproductionrate.However,thehotbrinecanflowdirectlythroughthereservoirandbeproducedfromproductionwellsinthelaterstage,whichlimitsthediffusionrangeofinhibitorsinreservoir.Thehydrateismainlydecomposedundertheactionofdepressurizationandthermalstimulation,andthegasproductionrateisalsoreduced.Meanwhile,theinhibitionofgasproductionduetotheformationofsecondaryhydrateandicecouldbeavoidedbythehotbrineinjection.Keywords：natur...
