混相溶剂法降低CO_2驱混相压力研究  

Study on reducing miscibility pressure in CO_2 flooding by miscible solvent

作　　者：张广东[1] 刘建仪[1] 柳燕丽[2] 周飞[2] 

机构地区：[1]油气藏地质及开发工程国家重点实验室西南石油大学,四川成都610500 [2]中油辽河油田公司,辽宁盘锦124010

出　　处：《特种油气藏》2013年第2期115-117,157,共3页Special Oil & Gas Reservoirs

基　　金：国家重点基础研究发展计划("973"计划)"温室气体提高石油采收率的资源化利用及地下埋存"项目资助(2006CB705800)

摘　　要：利用自主研制的高温高压界面张力测试仪,对混相溶剂法进行了大量的实验研究,优选最佳混相溶剂,然后进行了混相溶剂段塞对驱油效果影响实验,优选最佳注入尺寸,为现场实践提供依据。研究结果表明:混相溶剂法可以降低CO2驱油混相压力。综合考虑经济成本和混相溶剂来源等因素,优选轻质油C为降低目标油藏CO2驱混相压力的最佳混相溶剂,最佳的溶剂段塞尺寸为6%,驱油效率为85.19%,比单纯注CO2驱油提高了32.81个百分点。说明利用混相溶剂法降低CO2驱最小混相压力方法是合理可行的。This paper puts forward a miscible solvent method to reduce minimum miscibility pressure in CO2 flooding.By using self-developed high temperature and high pressure interfacial tension tester,a large number of experiments on miscible solvent method are carried out to select the best miscible solvent.The impact of miscible solvent slug size on oil displacement is also tested in the experiments to select the best injection size and provide basis for field operation.The results show that miscible solvent can reduce miscibility pressure in CO2 flooding.Considering the cost and source of miscible solvent and other factors,light oil C is selected as the best miscible solvent to reduce the miscibility pressure of CO2 flooding.The optimal solvent slug size is 6%,and oil displacement efficiency is 85.19% which increases by 32.18% compared to purely CO2 flooding.

关 键 词：CO2驱油 混相溶剂法 混相压力 段塞尺寸 实验研究 

分 类 号：TE357.45[石油与天然气工程—油气田开发工程]