低渗透油藏高浓度表面活性剂降压实验研究  

Experimental Study on Depressurization of High Concentration Surfactant in Low Reservoirs

作　　者：张卫平[1] 章倩倩 彭红霞[1] 鲍银亮 ZHANG Wei-ping;ZHANG Qian-qian;PENG Hong-xia;BAO Yin-liang(Yanchang Oilfi eld Co.,Ltd.Yulin 718600,Shaanxi,China)

机构地区：[1]延长油田股份有限公司定边采油厂,陕西榆林718600

出　　处：《合成材料老化与应用》2021年第3期80-82,164,共4页Synthetic Materials Aging and Application

摘　　要：针对低渗透油藏注水压力大的问题,研制了一种高浓度表面活性剂体系。以油在表面活性剂水溶液中的增溶为判据,从阴离子和非离子型表面活性剂中筛选出一个最佳的减压体系,即13.3%表面活性剂HEX+2.23%正丙醇+4.47%正丁醇,该体系具有良好的耐盐性,在1~200 g/L的NaCl浓度范围内表现出水外相微乳液。岩心驱油结果表明,这种高浓度表面活性剂体系与岩心中的残余油形成水外相微乳液,驱油压力降低35%以上。同时,还研究了浓度和注入量对降压效果的影响。结果表明,注入1孔容、盐浓度为100g/L的体系,降压效果良好。To solve the problem of high pressure of water injection in low permeability reservoirs,a high concentration of surfactant system was developed in this article.With the solubilization of oil in aqueous surfactant solution as a criterion,a formula was screened from anionic and nonionicanionic surfactants,and the optimal depressurized system was obtained as follows,13.3%surfactant HEX+2.23%n-propanol+4.47%n-butanol.The system has good salt tolerance,and the effluent microemulsion is in the range of 1~200 g/L NaCl concentration.Core flooding results show that this high concentration of surfactant system formed water external microemulsion with the residual oil in the core,reducing the displacement pressure over 35%.Meanwhile,the effects of concentration and injection volume on depressurization were also investigated.It indicated that a good depressurization effect was achieved after injecting 1 pore volume of the system with the salt concentration of 100 g/L.

关 键 词：联合系统 降压 注入压力 低渗透储层 微乳液 

分 类 号：TE357[石油与天然气工程—油气田开发工程]