特低渗透油藏CO2驱效果研究.doc

特低渗透油藏CO2驱效果研究————————————————————————————————作者：————————————————————————————————日期：个人收集整理勿做商业用途个人收集整理勿做商业用途个人收集整理勿做商业用途摘要特低渗透油藏注水开发过程中出现渗流阻力大，注水压力高，注水效果差等诸多问题，经研究发现注气开发有利于解决上述问题.本文通过室内物理实验方法，研究CO2驱中非混相驱替和混相驱的驱替效果和驱替机理,进一步确定此类油田是否适合CO2驱。实验结果表明,对于特低渗透油田有以下结论：(1)CO2驱采收率随注入量增加而增加,随驱替压力的增加而增加;（2)CO2突破前，生产气油比保持在原始溶解油气比，CO2突破后，生产气油比增加；(3）压力增加,CO2注入能力提高，当非混相驱时，压力增加，CO2注入能力增加的幅度比较小，达到混相以后，CO2注入能力迅速提高.（4)对于特低渗透油藏，混相驱采收率高于水驱,非混相驱采收率低于水驱;CO2驱注入能力最小是水驱700倍。总而言之，特低渗透油藏适合CO2驱。关键词：特低渗透油藏;CO2驱;驱替机理；室内实验AbstractWiththedevelopmentofnationaleconomy,crudeoildemandexceedssupply，moreandmoreverylowpermeabilityreservoirsneedtobeexploited.Wemeetmanyproblemsinthepresenceofwaterflooding，suchashighfiltrationalresistance，highwaterfloodingpressure，badwaterfloodingeffect。Reserchmentsofrecentyearsdemonstratethatgasinjectioncanresolvetheseproblems.LaboratoryexperimentofCO2displacementisdevelopedinordertoverifysuitabilityofCO2floodingtothiskindofreservoir。Theresultsoflaboratoryexperimentasflow:(1）InCO2flooding，oilrecoveryfactorincreasesasinjectionvolume;（2）BeforeCO2breakthrough，oil/gasratiomaintainsoriginaloil/gasratio，afterCO2breakthroughoil/gasratioincreases;(3)Injectioncapacityincreaseswithpressure，amplitudeofinjectioncapacityrisinginCO2misciblefloodingishigherthaninCO2immiscibleflooding;（4)OilrecoveryfactorofCO2misciblefloodingishigherthanwaterflooding,however，OilrecoveryfactorofCO2immiscibleislowerthanwaterflooding。InjectioncapacityofCO2ismorepowerfulthanwaterflooding.Inaword,CO2misciblefloodingissuitabletoverylowpermeabilityreservoir.本文为互联网收集，请勿用作商业用途个人收集整理,勿做商业用途Keywords:Extra—lowpermeablereservoir;CO2flooding;Displacementmechanism；LaboratoryexperimentⅠ目录TOC\o"1—2”\h\z\uHYPERLINK\l”_Toc202012814”第1章概述PAGEREF_Toc202012814\h1HYPERLINK\l”_Toc202012815”1.1我国低渗透油藏的地质特征PAGEREF_Toc202012815\h1HYPERLINK\l”_Toc202012816”1。2国内低渗透油田的注气开发现状PAGEREF_Toc202012816\h2HYPERLINK\l"_Toc202012817”1.3国外低渗透油田的注气开发现状PAGEREF_Toc202012817\h6HYPERLINK\l"_Toc202012818”1