边底水气藏注二氧化碳泡沫控水技术研究  

Water Control in the CO_2 Foal-Flooding Gas Reservoir with Bottom-Edge Aquifer

作　　者：牛保伦[1,2] Niu Baolun(Sinopec Zhongyuan Oilfield Company,Puyang,Henan 457001,China;Puyang Key Laboratory of Enhanced Oil Recovery,Puyang,Henan 457001,China)

机构地区：[1]中国石化中原油田分公司,河南濮阳457001 [2]濮阳市提高石油采收率重点实验室,河南濮阳457001

出　　处：《特种油气藏》2018年第3期126-129,共4页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金"改性纳米二氧化硅和表面活性剂协同作用的CO_2泡沫稳定机理及渗流特征"(51274228);"十三五"国家科技重大专项"高含硫气田水侵区注CO_2控水先导试验"(2016ZX05017-001);河南省博士后基金"非均质油藏CO_2驱流度控制技术"(P2013070)

摘　　要：针对气田普遍存在边底水入侵、常规液体堵剂无法深度堵水的问题,提出CO_2(CO_2泡沫)阻挡水体入侵的方式,通过高温高压微观可视化实验、CO_2泡沫控水模拟实验方法,从微观控水机理、宏观控水能力等方面探讨了CO_2与CO_2泡沫控水方法差异,优化了CO_2泡沫控水注入参数。实验结果表明:CO_2控水难以形成稳定的阻水带,其控水机理为贾敏效应;CO_2泡沫通过超临界CO_2形成的致密泡沫堆积作用可形成相对均衡推进的阻水带。该项研究明确了CO_2泡沫控水参数,即采用小段塞交替注入、泡沫浓度为0.8%、注入量为0.5倍孔隙体积。研究成果提出了可指导现场应用的关键注入参数,证实了采用CO_2泡沫控水方法可有效缓解强非均质气田水侵速度,并同时实现CO_2的埋存。该项研究对四川盆地、新疆等气田控水稳气具有指导意义。In order to improve the limitation of conventional liquid blocking agents in in-depth water plugging performance and widespread aquifer invasion in the gasfield,the CO2（CO2 foam） injection is proposed to block the aquifer invasion.The high temperature-pressure microscopic visualization experiment and water-control simulation with CO2 foam-flooding,the difference in water-control performances with CO2 and CO2 foam is discussed from the microscopic mechanism and macroscopic performance.In addition,the CO2 foam injection parameters are optimized for water-control.Experiment result shows that it is difficult to create a stable water blocking zone by CO2 watercontrol with Jamin effect.A relatively stable water blocking zone can be established by CO2 foam through the dense foam accumulation from supercritical CO2.According to this research,the reasonable CO2 foam-flooding parameters include alternate injection with small slug,0.8% foam concentration and 0.5-time injection volume factor.It provides key injection parameters for field application and confirms that the CO2 foam water-control can significantly relieve the aquifer invasion velocity of the strong-heterogeneity gas reservoir and realize CO2 storage.This research could provide certain guidance for the production maintenance and water-control of gasfields such as Sichuan Basin,Xinjiang and other areas.

关 键 词：CO2泡沫 微观机理 注气控水 水侵 参数优化 普光气田 

分 类 号：TE341[石油与天然气工程—油气田开发工程]