超稠油蒸汽co,2复合吞吐实验研究

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1、中国石油大学（华东）硕士学位论文超稠油蒸汽CO<,2>复合吞吐实验研究姓名：战永平申请学位级别：硕士专业：油气田开发工程指导教师：孙仁远20090401摘要超稠油粘度大，开发难度大，蒸汽吞吐开发效果较差。为了改善超稠油油藏的开发效果，提出蒸汽C02复合吞吐开采超稠油的方法。采用改进的PVT分析仪，研究了C02对稠油和超稠油饱和压力、溶解气油比、体积系数的影响。采用自行设计的高压含气原油粘度测量系统，测量了高温高压下含C02稠油、超稠油的粘度，研究了其影响因素。利用填砂管模型，采用稠油蒸汽驱实验装置，对比研究了超稠油注蒸汽、蒸汽

2、．C02复合吞吐对稠油采收率的影响，分析了蒸汽注入压力等因素的影响。结果表明，C02在稠油和超稠油中的溶解度很小，溶解C02的稠油和超稠油粘度降低，降幅约为300／,。蒸汽．C02复合吞吐比蒸汽吞吐采收率提高10％15％。同时探讨了蒸汽和C02复合驱油机理，指出C02的溶解有助于改善稠油在地层中的流动特性，并且蒸汽和C02的复合吞吐可以提高蒸汽的热利用率，提高蒸汽的波及系数，从而获得较高的采收率。超稠油蒸汽．C02复合吞吐技术是一种新型的采油技术，是一种针对超稠油油藏开采有效的增产措施。关键词：超稠油，C02，蒸汽吞吐，辅助蒸

3、汽吞吐，溶解度ExperimentalStudiesonC02AssistedSteamInjectionforSuper-heavyOilReservoirDevelopment(Oil&GasFieldDevelopmentEngineering)DirectedbyAbstractItisverydifficulttoexploitthesuper-heavyoilreservoirforitshigherviscosity，andlesseffectivebysteamstimulationmethod．Inorder

4、toenhancetherecoveryofsuper-heavyoilreservoirs，themethodofc02assistedsteamstimulationisproposed．TheeffectofC02onbubblepointpressure，solutiongas-oilratio，formationvolumefactorofheavyandsuper-heavyoilwasstudiedbythenewly-improvedPVTapparatus．Theviscositiesofheavyandsu

5、per-heavyoildissolvedbyC02underhighpressureandtemperatureweremeasuredbyself-designedhighpressureviseo-meter．ThefactorsefleetingtheviscosityofC02-heavyorsuperheavyoilsystemswerealsostudied．TheoilrecoverieswerecomparedbysteamstimulationandC02assistedsteamstimulationus

6、ingsteamfloodingequipmentandsand-packedmodels．Theeffectofinjectionpressureofsteamwasanalyzed．ExperimentsshowthatthesolubilitiesofC02inheavyandsuper-heavyoilsareverylow．TheviscosityofC02-heavyorsuper-heavyoilsystemsdecreasesbyupto30％．Comparedwimsteamstimulation,theoi

7、lrecoveryincreasesfrom10％to15％byC02assistedsteamstimulation．ThedisplacementmechanismsofC02injectionandsteamstimulationareanalyzed．C02dissolutioninheavyoilshelps．toimproveflowperformanceofheavyoil，c02alsohelps．toimprovetheheatutilizationofsteamtosomeextentcompared、炳t

8、hsteaminjectiononly．C02assistedsteamstimulationforsuper—heavyoilrecoveryisabrandnewtechniqueandveryeffectiveforenhantedsuper—heavyoilrecov