CO_(2)响应性增强泡沫体系室内试验研究  

Laboratory Test Study of CO_(2) Responsive Enhanced Foam System

作　　者：吕伟[1] 刘笑春[1] 白海龙[2] 彭明兰[3] LYU Wei;LIU Xiaochun;BAI Hailong;PENG Minglan(Oil and Gas Technology Research Institute,PetroChina Changqing Oilfield Company,Xi’an,Shaanxi,710018,China;Engineering Technology Management Department,PetroChina Changqing Oilfield Company,Xi’an,Shaanxi,710018,China;The No.2 Oil Production Plant,PetroChina Changqing Oilfield Company,Qingyang,Gansu,745100,China)

机构地区：[1]中国石油长庆油田分公司油气工艺研究院,陕西西安710018 [2]中国石油长庆油田分公司工程技术管理部,陕西西安710018 [3]中国石油长庆油田分公司第二采油厂,甘肃庆阳745100

出　　处：《石油钻探技术》2021年第5期88-93,共6页Petroleum Drilling Techniques

基　　金：国家科技重大专项“长庆低渗透砂岩油藏CO_(2)驱油与埋存注采工艺配套”(编号:2016ZX05056002);中国石油重大科技专项“CO_(2)驱油与埋存注采配套技术研究”(编号:2014E-3603)联合资助。

摘　　要：为解决低渗透油藏CO_(2)驱气体窜流影响开发效果的问题,以泡沫综合值为评价指标,通过搅拌法优选发泡剂,建立了CO_(2)响应性增强泡沫体系,配方为0.1%发泡剂AOS+4.0%小分子胺+水。该体系在接触CO_(2)前黏度与水接近,与CO_(2)作用后黏度可升高18倍以上。性能评价结果显示:CO_(2)响应性增强泡沫体系的泡沫综合值可达到常规泡沫体系的11倍以上;具有明显的剪切稀释特性,流变方程符合幂律流体流变模式;比常规泡沫体系具有更强的黏弹性,可以封堵优势渗流通道,抑制非均质低渗透油藏CO_(2)驱气体窜流,提高低渗透油藏CO_(2)驱的采收率。研究结果表明,CO_(2)响应性增强泡沫体系可以解决低渗透油藏CO_(2)气体窜流问题,提高CO_(2)驱的开发效果。The development effect of CO_(2) flooding in low permeability reservoirs is affected by the gas channeling.In response to this problem,the foam comprehensive value was used as the evaluation index to establish CO_(2) responsive enhanced foam system by optimizing foaming agent with stirring method.The formula was 0.1%foaming agent AOS(alpha olefin sulfonate)adding 4.0%small molecule amine and water.Its viscosity,which was close to water viscosity before exposure to CO_(2),increased by more than 18 times after reaction with CO_(2).The results of performance evaluation indicated the foam comprehensive value of the proposed CO_(2) responsive enhanced foam system could reach more than 11 times those of conventional foam systems,with obvious shear-thinning characteristics.The rheological equation conformed to the rheological model of power-law fluids.With stronger viscoelasticity than those of conventional foam systems,the proposed foam system could also be used to plug the dominant seepage channels to inhibit the gas channeling during CO_(2) flooding in heterogeneous low permeability reservoirs and ultimately to enhance the oil recovery in such reservoirs.The research results showed that the CO_(2) responsive enhanced foam system could solve the problem of gas channeling and improve the development effect of CO_(2) flooding in low permeability reservoirs.

关 键 词：低渗透油藏 二氧化碳驱 窜流 泡沫 提高采收率 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]