低渗透油层超低界面张力化学驱油方式研究  

Study on ultralow interfacial tension chemical flooding in low permeability reservoirs

作　　者：陈涛平[1] 蒲春生[2] 

机构地区：[1]中国科学院渗流流体力学研究所,河北廊坊065007 [2]西安石油大学石油工程学院,陕西西安710065

出　　处：《西安石油大学学报（自然科学版）》2006年第3期30-33,共4页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家西部科技行动计划重大攻关项目:"陕甘宁盆地低渗油田高效开发与水资源可持续发展关键技术研究"部分成果(项目编号:2005BA901A13)

摘　　要：针对目前低渗透油层水驱采收率较低的问题,在室内采用新型超低界面张力活性剂(SLB甜菜碱型)稀体系及其与相对分子质量为480万的聚丙烯酰胺复配体系,在人造低渗透均质圆柱状岩心中进行了8个方案的化学驱油方式对比研究.结果表明:对未开发或刚投入水驱的低渗透油层单独使用SLB超低界面张力活性剂驱油时,应先注活性水段塞,后进行水驱,方可获得较高的采收率;对已进行水驱且注入水接近突破的低渗透油层,在采出液含水率达98%以后,先注低分子量聚合物水溶液段塞,后注SLB超低界面张力活性水段塞,将比注入二者的复配体系段塞获得更高的采收率.In accordance with the low recovery efficiency of water flooding in low permeability reservoirs, the comparative study of 8 chemical flooding schemes of surfactant (SLB Lycine type) system and surfactant-polymer compound system (relative molecular mass of 480 × 104) is carried out with the artificial isotropic cores of low permeability in the lab. The study shows: when SLB ultralow interfacial tension surfactant flooding system is applied to undeveloped or just putting into water flooding blocks, higher recovery efficiency can be obtained if the activated water slug of SLB surfactant is injected at the first time and then the traditional waterflooding is carried out; for the waterflooding blocks with the water cut of above 98% , higher recovery efficiency is obtained by injecting polymer slug firstly and then injecting the activated water slug of SLB surfactant than by directly injecting SLB surfactant - polymer compound slug.

关 键 词：低渗透油层 超低界面张力化学驱油 表面活性剂驱油 活性剂-聚合物驱油 提高原油采收率 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]