特低渗油藏油气两相启动压力梯度研究(英文)

特低渗油藏油气两相启动压力梯度研究(英文)Abstract The study of two-phase startup pressure gradient is crucial for the de

() 特低渗油藏油气两相启动压力梯度研究英文 Abstract Thestudyoftwo-phasestartuppressuregradientiscrucialfor thedevelopmentofspeciallow-permeabilityreservoirs.The low-permeabilityreservoirsthatcontainbothoilandgaspresent challengesfortheexplorationandexploitationofhydrocarbon resources.Inthispaper,weinvestigatethepressuregradient duringthestartupoftwo-phaseflowinspeciallow-permeability reservoirscontainingoilandgas.Weanalyzetheeffectsofvarious factorsonthepressuregradientduringthestartupoftwo-phase flow.Theresultsshowthatthepressuregradientisinfluencedby multiplefactors,includingtheviscosityoftheliquidphase,the relativepermeability,thegassaturation,andthecapillary pressure. Introduction Speciallow-permeabilityreservoirsarecharacterizedbya permeabilitylessthan1millidarcy,andtheypresentunique challengesintheexplorationandexploitationofhydrocarbon resources.Thechallengesarerelatedtothelowproductivityof thewells,theuncertaintyintherecoveryofhydrocarbons,andthe highdrillingandcompletioncosts.Inthesereservoirs,theoiland gasphasescoexist,andthetwo-phaseflowbehaviorisnotwell understood.Athoroughunderstandingofthetwo-phaseflow behaviorinspeciallow-permeabilityreservoirsiskeytothe optimalexploitationofhydrocarbonsfromthesereservoirs. Inthispaper,wefocusonthestudyofthepressuregradient duringthestartupoftwo-phaseflowinspeciallow-permeability reservoirsthatcontainbothoilandgas.Thestartuppressure gradientistheminimumpressuregradientneededtoestablish theflowofoilandgasinthereservoir.Thepressuregradientis influencedbyvariousfactors,suchastheviscosityoftheliquid phase,therelativepermeability,thegassaturation,andthe capillarypressure. MaterialsandMethods Wegeneratedasyntheticreservoirmodelusingthe petrophysicaldataofanactuallow-permeabilityreservoir.The syntheticmodelincludeddimensionsof1000ftx1000ftx100ft,