纳米驱油剂在增注驱油中的作用  

Effect of Nano-sized Oil-displacement Agent in Increasing Water Injection for Oil Displacement

作　　者：任晓娟[1] 王睿 潘谦宏 齐银[3] 阿斯亚·巴克 罗向荣[1] REN Xiaojuan;WANG Rui;PAN Qianhong;QI Yin;ASYA Barker;LUO Xiangrong(College of Petroleum Engineering,Xi’an Shiyou University,Xi’an,Shaanxi 710065,P R of China;Xi’an Changqing Chemical Group,Xi’an,Shaanxi 710018,P R of China;Oil and Gas Technology Research Institute,Changqing Oilfield Branch Company,PetroChina,Xi’an,Shaanxi 710018,P R of China)

机构地区：[1]西安石油大学石油工程学院,陕西西安710065 [2]西安长庆化工集团有限公司,陕西西安710018 [3]中国石油长庆油田分公司油气工艺研究院,陕西西安710018

出　　处：《油田化学》2021年第1期147-151,共5页Oilfield Chemistry

基　　金：国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”(项目编号2016ZX05050006)。

摘　　要：为分析纳米驱油剂在低渗储层增注驱油中的作用,评价了以硅烷偶联剂改性的纳米SiO_(2)为主要成分的纳米驱油剂的基本性能,通过枣湾区块长6储层天然岩心和微观模型驱替实验研究了纳米驱油剂的流动特征和驱油特征。结果表明,纳米驱油剂中的纳米颗粒粒径较小,具有较低的油水界面张力、良好的亲水性及一定的静态吸附能力。30℃下,0.1%纳米驱油剂的油水界面张力为0.784 mN/m,在亲水和亲油载玻片上的润湿接触角分别为22.5°和16.2°,在长6岩心表面的平均静态吸附量为0.0033 mL/g。纳米驱油剂可以驱替常规水驱波及不到的圈闭在小孔隙中的残余油,且能剥离吸附在孔隙表面的油,对片状集中分布残余油的驱替效果好于网状分散分布的残余油。在微观模型和天然岩心中注入1 PV 0.1%纳米驱油剂后,水驱渗透率分别提高55.2%~56.7%和34.3%~55.4%,驱油效率分别提高10.9%~21.6%和6.1%~10.1%,增注驱油效果较好。In order to analyze the effect of nano-sized oil-displacement agent in increasing water injection in low permeability reservoir,the basic properties of nano-sized oil-displacement agent with nano-SiO_(2)modified by silane coupling agent as the main component were evaluated,and the flow characteristics and displacement characteristics of nano-sized oil-displacement agent were studied through natural core and microscopic model displacement experiments of Chang6 reservoir in Zaowan block.The results showed that the nano particles in nano-sized oil-displacement agent had small particle size,low oil-water interfacial tension,good hydrophilicity and certain static adsorption.At 30℃,the oil-water interfacial tension of 0.1%nano-sized oil-displacement agent was 0.784 mN/m,the wetting contact angle on hydrophilic and oil-wet slide was 22.5°and 16.2°,and the average static adsorption capacity on the surface of long 6 core was 0.0033 mL/g.The nano-sized oil-displacement agent could displace the residual oil trapped in small pores which could not be swept by conventional water flooding,and could peel off the oil adsorbed on the pore surface.The displacement effect on flake concentrated distribution of residual oil was better than that of network dispersed distribution of residual oil.After 1 PV 0.1%nano-sized oil-displacement agent was injected into the core micro model and natural core,the water flooding permeability increased by 55.2%—56.7%and 34.3%—55.4%,and the oil displacement efficiency increased by 10.9%—21.6%and 6.1%—10.1%,respectively,showing good effect of increasing water injection for oil displacement.

关 键 词：低渗储层 纳米驱油剂 采收率 渗透率 增注驱油 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]