ASP体系在大庆二类油层中的色谱分离现象及其对采收率的影响  

Chromatographic Separation of ASP System and Its Effect on Recovery in Daqing Second-Class Oil Layer

作　　者：郝宏达[1,2,3] 侯吉瑞[1,2,3] 赵凤兰[1,2,3] 刘刚[1,2,3] 吴晨宇[1,2,3] 王凤刚[1,2,3] 郭福广[1,2,3] 

机构地区：[1]中国石油大学(北京)提高采收率研究院,北京102249 [2]中国石油三次采油重点实验室低渗油田提高采收率应用基础理论研究室,北京102249 [3]教育部油田开发重点实验室,北京102249

出　　处：《油田化学》2015年第1期119-122,127,共5页Oilfield Chemistry

基　　金：国家重大专项"油田开采后期提高采收率技术"(项目编号2011ZX05009-004);国家示范工程"大庆长垣特高含水油田提高采收率示范工程"(项目编号2011ZX05052);国家自然科学基金项目"ASP复合驱油藏油水界面张力变化规律及残余油启动机制研究"(项目编号NO.51174216)

摘　　要：ASP体系在二类油层中运移不同距离时,体系的黏度和及其与原油间的界面张力等均会发生变化。本实验采用不同长度的人造岩心(10、20、30、60和80 cm)来模拟ASP体系在油藏中的运移距离,通过测定各组实验产出液的黏度及其与原油间界面张力,分析ASP体系运移不同距离时体系性能的变化及其对采收率的影响。实验结果表明,随着ASP驱油剂运移距离的增大,复合驱采收率逐渐降低,且在近井地带附近采收率降低的幅度较大。复合驱采收率受复合体系的黏度和其与原油界面张力影响,在0~30 cm运移范围内,由于超低界面张力和较强流度控制能力的综合作用,驱油剂在油藏中的波及体积和驱油效率较大,复合驱采收率和最终采收率较高;当运移距离大于30 cm时,由于界面张力值迅速升高,其对采收率的贡献较小,此时体系的黏度在驱油过程中起着主导作用;复合驱采收率随着驱油剂相对注入量的增大而增加,适当地增大ASP驱油剂的相对注入量可有效的提高大庆二类油层的采收率。The viscosity of ASP system and the interfacial tension between ASP system and the crude oil can be changed when the ASP agent flows through the Secondary-Class oil layer. In this paper,five different length of artificial cores(10,20,30,60,80 cm)were used to simulate the different ASP migration distances. The viscosity of the production fluid and the interfacial tension between the production fluid and the simulated oil were measured in order to analysis the effect of the change of ASP agent properties on recovery. The result showed that as the migration distance increasing,the ASP flooding recovery decreased gradually and the decreasing range of the recovery was larger nearby the injection end. The ASP flooding recovery was affected by the viscosity and the interfacial tension. When the migration distance was smaller than 30 cm,the displacement efficient and sweep efficient were relative higher because of the low interfacial tension and strong mobility control ability,leading to higher flooding recovery and ultimate recovery;however,when the migration distance was larger than 30 cm,the viscosity played the dominant role in the ASP flooding process and the effect of the interfacial tension was weak. The ASP flooding recovery increased with the increase of relative injection volume. Therefore,the increase of the relative injection volume of the ASP flooding adequately could enhance the recovery of Daqing second-class oil layer effectively.

关 键 词：二类油层 三元复合驱 黏度 界面张力 采收率 

分 类 号：TE357.4[石油与天然气工程—油气田开发工程]