塔木察格油田降压增注工作液配方体系研究  

Study on formula system of antihypertensive injection working fluid in Tamchag Oilfield

作　　者：曹广胜[1] 杜雨洋 白玉杰 翟胜博 赵小萱 CAO Guang-sheng;DU Yu-yang;BAI Yu-jie;ZHAI Sheng-bo;ZHAO Xiao-xuan(Key Laboratory of Enhanced Oil Recovery of Oil and Gas,Ministry of Education,Northeast Petroleum University,Daqing 163318,China)

机构地区：[1]东北石油大学教育部油气提高采收率重点实验室,黑龙江大庆163318

出　　处：《化学工程师》2023年第9期62-66,118,共6页Chemical Engineer

基　　金：国家自然科学基金(51574089):活性原油在非均质储层中的自适应控水增油机理。

摘　　要：塔木察格油田属于低渗透油田,在实际开采过程中,会出现“注水压力高、注入难度大”的问题。为了提高低渗透油藏注水开发效果,工作液的选择起到关键性的作用。通过测定工作液与原油的界面张力,结合储层配伍性实验和降压增注性能评价实验,配制出适用于塔木察格储层特性的阴离子-非离子表面活性剂工作液体系。在塔木察格油田21区块北部南一段油层Ⅰ+Ⅱ油组地层水的pH值为7.5、矿化度为3000mg·L^(-1)的条件下,本文选择的增注配方为:0.9%椰子油二乙醇酰胺+0.7%十二烷基苯磺酸钠+0.5%无水乙醇+3%黏土稳定剂。该配方对渗透率低于80m D的岩芯,降压率可以达到25%以上;对于渗透率小于15.9m D的岩芯,降压率可达到30%以上。该工作液体系可以有效提高塔木察格油田增注效果。Tamtsag Oilfield is a low-permeability oilfield.In the actual production process,there will be"high water injection pressure and high injection difficulty".In order to improve the waterflood development effect of low permeability reservoir,the selection of working fluid plays a key role.By measuring the interfacial tension between the working fluid and crude oil,combined with the reservoir compatibility test and the depressurization and injection performance evaluation test,the anion-nonionic surfactant working fluid system suitable for the characteristics of the Tamtsag reservoir was prepared.Under the condition that the pH is 7.5 and the salinity is 3000mg·L^(-1)in the formation water of Ⅰ+Ⅱ oil group in the southern section of the northern part Block 21 of Tamchatag Oilfield,the injection increasing formula selected in this paper is:0.9%coconut oil diethanolamide+0.7%sodium dodecylbenzene sulfonate+0.5%anhydrous ethanol+3%clay stabilizer.For cores with permeability less than 80mD,the depressurization rate can reach more than 25%;For cores with permeability less than 15.9mD,the depressurization rate can reach more than 30%.The working fluid system can effectively improve the effect of increasing injection in Tamtsag Oilfield.

关 键 词：低渗透 界面张力 防膨率 表面活性剂 降压增注 

分 类 号：TE38[石油与天然气工程—油气田开发工程]