X油藏注气混相驱可行性实验研究.pdf

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1、石油与天然气化工第４６卷第４期CHEMICALENGINEERINGOFOIL&GAS６３X油藏注气混相驱可行性实验研究１２３１１李轶超姚先荣王长权代宸宇杨琳琳１．中国石油大学（北京）２．中国石油川庆钻探工程公司３．长江大学摘要针对X底水油藏油井注水后综合含水上升过快的问题，利用HB７０／３００型高压物性分析仪开展了该区块原油相态特征实验、注气相态特征实验，并运用细管法开展了注CO２最小混相压力实验。对比分析了CO２和N２两种性质气体注入前后原油的相态特征变化，确定了该区块原油注CO２最小混相压力，为X油藏注气

2、提高采收率可行性提出依据。实验结果表明，X油藏原始地层压力为４６．０１MPa，原油饱和压力为１１．０６MPa，注N２后饱和压力上升迅速，在原始地层条件下难以实现混相，表现出典型的非混相特征；注CO２后饱和压力上升较平缓，细管法测得的最小混相压力为２８．０３MPa，说明利用CO２可实现CO２的混相驱替，而且最终的驱替效果比较理想。说明该油藏可开展注CO２混相驱，为进一步的开发方案调整提供了依据和合理的建议。关键词N２CO２饱和压力混相驱替中图分类号：TE３５７．４５文献标志码：ADOI：１０．３９６９／j．iss

3、n．１００７‐３４２６．２０１７．０４．０１２FeasibilityexperimentalresearchonmisciblefloodingofXreservoirbygasinjection12311LiYichao，YaoXianrong，WangChangquan，DaiChenyu，YangLinlin１．ChineseUniversityofPetroleum，Beijing，China；２．CNPCChuanqingDrillingandExplorationEngineeringCompany

4、Ltd，Chengdu，Sichuan，China；３．YangtzeUniversity，Jingzhou，Hubei，ChinaAbstract：InordertosolvetheproblemthatthecomprehensivewatercutisrisingtoofastafterwaterinjectioninXreservoir，theresearchhasbeencarriedoutinthispaper．Experimentsonphasebehaviorofcrudeoilandphase

5、behaviorexperimentsofgasinjectionhavebeencarriedoutbyusingHB７０／３００highpressurephysicalpropertiesanalyzer．TheminimummiscibilitypressureofCO２injectionhasbeencarriedoutbyusingthintubemethod．ThephasebehaviorofcrudeoilhasbeenanalyzedbeforeandafterN２orCO２injection

6、．Inthispaper，theminimummisciblepressureofcrudeoilforCO２injectionisdetermined，whichprovidesbasisforEORofXreservoir．TheseexperimentsshowedthattheoriginalpressureofXreservoiris４６．０１MPa，thesaturationpressureofcrudeoilis１１．０６MPa，whichcanhardlygetmisciblefloodingb

7、yN２injectionbecausethesaturationpressurewillrisequickly．ThesaturationpressurewillrisegentlyforCO２．Theminimummiscibilitypressuremeasuredbythethintubemethodis２８．０３MPa，indicatingthatmisciblefloodingbyCO２injectioncanbeachieved．Andtheultimatedisplacementeffectisi

8、deal．ThereservoircanbeinjectedwithCO２miscibleflooding，whichprovideabasisandreasonablesuggestionsforadjustingdevelopmentplan．Keywords：nitrogen，carbondioxide，saturationpressure，miscibleflooding基金项