黏土矿物对三元复合体系驱油效果的影响  

Effect of Clay Mineral on Oil Displacement Efficiency of Alkali-surfactant-polymer System

作　　者：施雷庭[1] 李尧[1] 叶仲斌[1] 张言亮 张晓芹[3] 石京平[3] SHI Leiting;LI Yao;YE Zhongbin;ZHANG Yanliang;ZHANG Xiaoqin;SHI Jingping(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,P R of China;Changqing Oilfield Company,PetroChina,Xi’an,Shaanxi 710000,P R of China;Exploration and Development Research Institute of Daqing Oilfield Company,Ltd,Daqing,Heilongjiang 163712,P R of China)

机构地区：[1]油气藏地质与开发工程国家重点实验室(西南石油大学),四川成都610500 [2]中国石油天然气股份有限公司长庆油田分公司,陕西西安710000 [3]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《油田化学》2022年第4期695-698,共4页Oilfield Chemistry

基　　金：十三五国家科技重大专项子课题“海上油田化学驱关键应用基础问题研究”(项目编号2016ZX05025003-012);海洋石油高效开发国家重点实验室开放基金课题“稠油油藏多孔超支化分子降黏驱油体系研究”(项目编号CCL2018RCPS0027RON)。

摘　　要：为研究黏土矿物含量对大庆三类油层油藏三元复合驱驱油效果的影响,采用孔隙度和渗透率相近、但黏土矿物含量不同的天然岩心开展驱油实验,并对实验前后的岩心进行核磁共振、X射线衍射分析及产出液乳化粒径测试。结果表明,随着黏土矿物含量逐渐增大,三元复合驱提高原油采收率幅度先增加后降低。在黏土矿物含量为9.5%时,三元复合驱采收率增幅(15.7%)最大。产出液中存在明显的乳化现象,黏土矿物含量由2.3%增至9.6%时,乳状液由油包水型转变为水包油型,粒径不断变小。黏土矿物含量越高,矿物中的高岭石越容易发生运移,使岩心孔喉变大并形成特定渗流通道,导致水驱效果变差,总采收率降低。黏土矿物的含量对大庆油田三元复合驱的驱油效果存在较大影响,主要通过改变产出液乳状液类型、粒径和矿物发生运移后岩心孔喉大小影响水驱及三元复合驱原油采出程度,进而改变最终采收率。In order to study the influence of clay mineral content on the oil displacement efficiency of ternary composite flooding in three types of reservoirs in Daqing,using natural cores with similar porosity and permeability but different content of clay,oil displacement experiment was developed. The core before and after the experiment was analyzed by X-ray diffraction and nuclear magnetic resonance. The emulsified particle size of the produced fluid was also tested. The results showed that with the increase of clay mineral content,the range of oil recovery improved by alkali-surfactant-polymer(ASP)flooding increased first and then decreased. When the clay mineral content was 9.5%,the recovery of ASP flooding had the largest growth rate(15.7%). There was obvious emulsification in the produced solution. When the clay mineral content increased from 2.3% to 9.6%,the emulsion changed from water-in-oil type to oil-in-water type. The particle size kept decreasing. The higher the clay mineral content,the easier migration of kaolinite in mineral was. It made the pore throat of the core larger. A specific seepage channel formed,leading to the poor water flooding effect and the reduction of ultimate recovery factor. The content of clay mineral had a great influence on the oil displacement efficiency of ASP flooding in Daqing oilfield. The oil recovery degree of water flooding and ASP flooding was affected mainly through changing the type of emulsion in produced liquid,particle size and the size of core pore throat after mineral migration. As a result,the final recovery factor was changed.

关 键 词：黏土矿物 三元复合驱 驱油效果 采收率 

分 类 号：TE357[石油与天然气工程—油气田开发工程]