低渗透油藏水平井产能分析

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1、’～k，h■ResearchofProductivityofHorizontai、№llinLowPermeabilityReservoirChenHan(Oil&Gas‘FieldDevelopmentEngineering)Directedbyprof．CuiChuan出AbstractAtpresent，thereh．asbeenmanycasesindevelopinglowpermeabilityreservoirbyusinghorizontalwellshomeandabroad．IfhorizontalwellCallbeusedtodeveloplowpermeabil

2、ityreservoir，notonlyeffectivedisplacementpressurecanbebuiltandpressuredroparoundthewellborecanbelowered，butalsomorenumberoffracturesCallbethroughed．Itissignificanttopredictproductivityofhorizontalwellinlowpermeabilityreservoircorrectly,becauseitisinvolvedinoptimaldesignofhorizontalwell，developmen

3、teffectandeconomicefficiency．BasedonthedeterminationofTPG，stableproductivityofhorizontalwellsisderivedbyprincipleofsuperposition．TheinfluencingfactorsofstableproductivityofhorizontalwellsareanalysedincludingTPG，coefficientofdeformation，anisotropyfactor,horizontalwelllength,reservoirthickness．Basi

4、cseepagedifferentialequationofone-dimensionalradialfluidflowisestablishedforperformanceofhorizontalwellsinlowpermeabilityreservoir．Inordertosolvetheequation，LaplacetransformisusedandLaplacespacesolutionisobtained，andthenphysicalspacesolutionisgotbyStehfestnumericalinversion．Furthermore，thechangin

5、gregularityofdimensionlessbottomholepressure(BHP)isanalyzedonthebasisoffixedprodutionandthechangingregularityofdimensionlessproductionisanalyzedonthebasisoffixedBHP．Intheprocessofderivingstableproductivityoffracturedhorizontalwellsinlowpermeabilityreservoir,itisvitaltogettheoutputofeveryfractureb

6、yusingEquivalentFiltrationalResistanceMethod(EFRM)．Theproductivityequationfromthistextiscomparedwithotherfourdifferentformula．Thenapplicableconditionsofeveryformulaandoptimizednumberoffracturesaregained．Fornon—steady—stateproductivityoffracturedhorizontalwell，mathematicalmodelwasestablishedwhichi

7、sinsimationofabox-typereservoir．SolutionWasgotbytheGreenFunctionandSourceFunctionmethod．Thenanalyticalformulaswasgained．Onthebasisofthat，thechangingregularityofoutputofeveryfracturewereanalysedandoutputoffracturedhoriz