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低渗透砂岩油藏剩余油整体监测研究的中期报告 Abstract Basedonthemonitoringdataofalow-permeabilitysandstoneoilreservoir,thisstudyanalyzedthereservoir'soverallperformanceandprovidedinsightsintothereservoir'sremainingoildistribution,flowcharacteristicsandpotentialforenhancedoilrecovery.Theresearchfoundthattheremainingoilinthereservoirwasmostlydistributedinlow-permeabilityzonesandfavorablemicrofacies.Theflowcharacteristicsofthereservoirwerecomplex,withacombinationofdiffusion,viscousflowandgravitysegregation.Thestudyalsorevealedpotentialforenhancedoilrecovery,includingwaterfloodingandchemicalinjection. Introduction Low-permeabilitysandstoneoilreservoirshavebecomeanimportanttargetforoilexplorationanddevelopmentduetotheirlargereservesandpotentialforenhancedoilrecovery.However,thesereservoirspresentcomplexgeologicalcharacteristicsandflowbehavior,whichmakeitdifficulttoanalyzetheirperformanceandexploreeffectiveoilrecoverymethods.Toaddressthesechallenges,thisstudyconductedanoverallmonitoringofalow-permeabilitysandstoneoilreservoirandprovidedinsightsintothereservoir'sremainingoildistribution,flowcharacteristicsandpotentialforenhancedoilrecovery. Materialsandmethods Themonitoringdatausedinthisstudywereobtainedfromalow-permeabilitysandstoneoilreservoirintheWesternOilfieldofChina.Thereservoirhasadepthof2200-2400mandathicknessof50-80m.Atotalof15horizontalproductionwellsweredrilledinthereservoir,andmonitoringinstrumentswereinstalledineachofthemtocapturedataonproduction,pressure,temperatureandfluidproperties.ThemonitoringperiodwasfromJuly2017toDecember2019. Resultsanddiscussion Theanalysisofthemonitoringdatashowedthattheoilproductionrateofthereservoirdeclinedrapidly,indicatingthatthereservoirhadenteredthelatestageofproduction.Theremainingoilinthereservoirwasmostlydistributedinlow-permeabilityzonesandfavorablemicrofacies,suchasintergranularpores,intragranularporesanddissolvedpores.Theflowcharacteristicsofthereservoirwerecomplex,withacombinationofdiffusion,viscousflowandgravitysegregation.Theflowregimewasinf