多场耦合作用下深部煤层气水平井裂缝扩展及产气规律

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中图分类号：TE377 文献标志码：A 文章编号：1000-7393（2025）-02-0224-11

Abstract：Inresponsetothekeyissuesofunclear fracture propagation paternsand productiondynamicsofdeecoalbedethane （CBM）horzontal welswithstaged fracturing intheShenfu block，thisstudyaimstorevealthefracturepropagationandgas production behaviorundermulti-fieldcoupling efects，providing theoretical supportfortheeficient developmentof deep CBM. Basedongeologicaldata，wellogging，fracturing，andproductiondata fromthe Shenfu block，numericalsimulation methodsare employed，using theBenxi Formation 8+9# coal as the research object.A gas-water two-phase flow fracturing-production integrated numericalsimulatothod，osideringdsotosotioectsiteow-solageodel，isods studyinvestigates thecontroloffracturigsectiondesignparameters （clusterspacig）andgeologicalparameters （stressdifference elastic modulusandPoisson’satio）onfracture propagationandevaluatestheefectsofreservoirfracturigonCBMdevelopment andoptimization ofthe fracturingscheme.The numerical simulationresultsshow thatthe HMD model is efectively applied tothe studyof fracture propagationand CBMdevelopment effects indeepCBMhorizontal welswith staged fracturing.Therankingof geologicalandegineeingpaametersintesofteirotrolovrfractures，froosttoleastifluetialisasfo：str difference > Poisson's ratio > elastic modulus > cluster spacing. After fracturing， the coal seam permeability and cumulative gas productioincreasedby67timsand5.18times，espectivelyompaedtobeforefracturigProductiosimulationresultsicate thatthhighest productionisachieved whenthefractureclusterspacingisbetween2Oand2.5meters.Thestudyreveals hefracture propagationpatesundermulti-fieldcouplingefects indeepCBMorizontalwels，providingvaluable insightsforoptimingdep coalbed fracturing schemes and evaluating development effects.

Keywors：deepcoalbedmethane;horizontalwell;stagedfracturing;fracturepropagation;gasproductionbehavior;numerical simulation

0 引言

中国深部煤层气（煤层埋深大于 2000m 煤层气）资源丰富[1]，是非常规天然气勘探开发的重要方向与规模性增储上产的重要领域[2]。（剩余18708字）