■■■■■■■■■■■■■■■■采矿与井巷工程第42卷第03期2023年03月煤炭技术CoalTechnologyVol.42No.03Mar.2023doi:10.13301/j.cnki.ct.2023.03.001低阶煤气水两相渗流特征的数值模拟研究*祝捷，侯晨雨，刘谨嘉，唐俊，邵唐砂，邹骐竹（中国矿业大学(北京)力学与建筑工程学院，北京100083）摘要：以海拉尔盆地伊敏低阶煤为研究对象，建立了考虑煤体三维变形的煤储层气水两相流模型，运用COMSOL软件得到了与伊敏煤样气驱水实验结果吻合的气、水流量和进口气体压力变化曲线。进一步探讨了不同井底流压下降方案（0.005MPa/d和0.01MPa/d）的煤储层产气特征。研究表明：煤层气井排采需经历产量提升阶段，在井底流压达到最低值时，产气量达到峰值，然后产量降低进入稳产阶段；减缓井底流压的下降速率有利于保持稳产阶段的产气量。关键词：低阶煤；气水两相流；数值模拟；产气量；井底流压中图分类号：TE312文献标志码：A文章编号：1008－8725（2023）03－001－04ResearchonNumericalSimulationofGas-WaterTwo-phaseSeepageinLow-rankCoalsZHUJie,HOUChenyu,LIUJinjia,TANGJun,SHAOTangsha,ZOUQizhu(SchoolofMechanicsandCivilEngineering,ChinaUniversityofMiningandTechnology-Beijing,Beijing100083,China)Abstract：Yiminlow-rankcoalinHailarbasinwereselectedastheresearchobject,andthegas-watertwo-phaseflowmodelofcoalreservoirwasestablishedconsideringthethree-dimensionaldeformationofcoalbody.UsingCOMSOLsoftware,thegasandwaterflowrateandinletgaspressurecurvewereobtainedwhichwereconsistentwiththeresultsoftheYimincoalsamplegasdrivingwaterexperiment.Thegasproductioncharacteristicsofcoalreservoirunderdifferentbottom-holeflowingpressurereductionschemes(0.005MPa/dand0.01MPa/d)werefurtherdiscussed.TheresearchshowsthatCBMwelldrainageneedstogothroughtheproductionincreasestage.Whenthebottom-holeflowingpressurereachestheminimumvalue,thegasproductionreachesthepeakvalue,andthentheproductiondecreasesandentersthestableproductionstage;slowingdownthedeclinerateofthebottom-holeflowingpressureisconducivetomaintainingthegasproductioninthestableproductionstage.Keywords:low-rankcoal;gas-watertwo-phaseflow;numericalsimulation;gasproduction;bottom-holeflowingpressure0引言世界煤层气...
