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时间:2020-01-17
《低渗透油藏CO2驱过程中含水率变化规律》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第4l卷第4期吉林大学学报(地球科学版)V01.41No.42011年07月JournalofJilinUniversity(EarthScienceEdition)July2011低渗透油藏C02驱过程中含水率变化规律俞宏伟,杨思玉,李实,杨永智国家提高采收率重点实验室/中国石油勘探开发研究院,北京100083摘要:通过国内外多个油田水驱后实施C0:驱的矿场实例研究,发现注入C0z后很多油井存在含水率下降的现象;这种现象发生在C()2驱的整个开发阶段,包括注气初期阶段COz未到达生产井、生产井见气阶段以及高气油比阶段。重点讨论了生产井见气前的开发规律.在该阶段油藏内
2、以油水两相渗流为主,不受三相渗流作用的影响。通过现场动态反应并结合室内细管和长岩心实验,揭示了COz与油、水2种介质的相互作用,得到了两个结论:第一是始于低含水阶段的C02驱过程中气体穿越地层水驱替地层油到达生产井;第二是始于高含水阶段的C02驱替规律在不同级别低渗透岩心中的差异非常明显:对于特低渗岩心,C02突破前的采出程度占C02驱总采出程度的73.27%,C02突破后的采出程度占26.73%,对于一般低渗岩心,C0:突破前的采出程度仅占C02驱总采出程度的16.72%,而C02突破后的采出程度占到了C02驱总采出程度的83.28%。关键词:C02驱;低渗透;室内
3、实验;含水;开发规律;油气中图分类号:P618.13文献标志码:A文章编号:1671—5888(2011)04—1028—05RulesofWaterCutVariationinLowPermeabilityOilReservoirC02FloodingProcessYUHong-wei,YANGSi-yu,LIShi,YANGYong—zhiStateKeyLaboratoryofEnhancedo“Recovery/ResearchInstituteofPetroleumExplorationandDevelopment,PetroChina,Beijin_{l1
4、00083,ChinaAbstract:ThroughthestudyofmanydomesticandabroadfieldexamplesofC02floodingafterwaterflooding,itisdiscoveredthataftertheinjeetionofC02,thewatercutofmanyproductionwellsdecreasessharply,andthisphenomenonhappensacrossthewholedevelopmentphase,includingtheearlystageofC02injectionwhi
5、chtheC02displacingfrontdoesn’treachproductionwells,thestageoflittlegasproducing,andthestageofhighgas—oilratio.WetakeemphasisondiscussingthedevelopmentrulesofIOWpermeabilityreservoirbeforethebreakthroughofC02,andonthisstageoil—watertWO—phasefluidflowisthemainflowtype,andthree-phaseflowdo
6、esnotexist.ThereasonisthatamajorityoftheinjectedC02dissolvedinlocaloilandwater.AccordingtOtheactualoilfielddynamicresponseandtheresultsofin-houseslimtubeandlongcorefloodingexperiment,weexplaintheactionbetweenCOzandoil—watersystem.finallygaintWOconclusions.Thefirstisthatgascandrivecrudeo
7、ilreachingproducersbytravelingthroughlocalwater.ThesecondisthatthedisplacementlawisobviouslydifferentindifferentlowpermeabilitycoreswhenC02floodingstartingfromhighwatercutstage,forthespeciallowpermeabilitycores,theoilrecoverybeforeC02breakingaccountedforC02totalrecoveryof收稿日期:2
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