含氟纳米乳液的制备及在储层润湿逆转中的应用  

Preparation of fluorine-containing nano-emulsion and its application in reservoir wetting reversal

作　　者：卢丽娟 王磊[1] 吴江 赖小娟[1] 刘贵茹[1] 刘雅梦 LU Lijuan;WANG Lei;WU Jiang;LAI Xiaojuan;LIU Guiru;LIU Yameng(Shaanxi Key Laboratory of Light Chemical Additives,Shaanxi University of Science&Technology,Xi'an 710021,Shaanxi,China;National Engineering Laboratory of Ultra-Low Permeability,Research Institute of Petroleum Technology,PetroChina Changqing Oilfield Company,Xi'an 710000,Shaanxi,China)

机构地区：[1]陕西科技大学陕西省轻化工助剂重点实验室,陕西西安710021 [2]中国石油长庆油田分公司油气工艺研究院超低渗国家工程实验室,陕西西安710000

出　　处：《精细化工》2024年第2期440-446,共7页Fine Chemicals

基　　金：陕西省外国专家服务计划项目(2023WGZJ-ZD-03);陕西省重点研发计划项目(2023-YBGY-307);陕西省教育厅产业化项目(23JC008)。

摘　　要：以甲基丙烯酸甲酯、丙烯酸丁酯、γ-甲基丙烯酰氧基丙基三甲氧基硅烷、全氟己基乙基丙烯酸酯(PEA)为原料,制备了一种可改变储层润湿性、防止储层水锁的含氟纳米乳液(FPA)。采用FTIR、SEM、XRD、马尔文激光粒度仪对FPA乳液进行了表征,采用表面张力、排出率、毛细管自吸、接触角测试方法考察了FPA-3(PEA质量分数为1.5%)乳液质量分数对改变岩心润湿性的影响。结果表明,PEA成功引入到聚合物链上,随着PEA质量分数的增加,乳液粒径增大,当PEA质量分数>1.5%时,乳液出现分层,FPA-3乳液稳定性最好。随着FPA-3乳液质量分数的增大,FPA-3水溶液表面张力减小,排出率增大,毛细管自吸高度减小,与水的接触角增大。当乳液质量分数均为2.0%时,与PA水溶液相比,FPA-3水溶液的表面张力由46.01 mN/m减小至22.68mN/m,降低了50.70%;排出率由19.89%增至29.47%,提高了48.16%;岩心的表面自由能由73.2 mN/m减小至8.7 mN/m;使岩心由亲水性(θ=69.8°)转变为疏水性(θ=125.1°)。质量分数为2.0%的FPA-3水溶液的毛细管自吸高度由清水的42 mm减至30 mm。A fluorine-containing nanoemulsion(FPA)to change reservoir wettability and prevent reservoir water lock was prepared from methyl methacrylate,butyl acrylate,γ-methylacryloxy propyl trimethoxy silane and perfluoroalkyl ethyl acrylate(PEA),and then characterized by FTIR,SEM,XRD and Malvern laser particle size analyzer.The effect of FPA-3(mass fraction of PEA was 1.5%)emulsion mass fraction on the core wettability was analyzed by surface tension,discharge rate,capillary imbibition and contact angle.The results showed that PEA was successfully introduced into the polymer chain,and the particle size of the emulsion increased with the increase of PEA mass fraction.The emulsion was stratified when PEA mass fraction was greater than 1.5%and FPA-3 emulsion exhibited the best stability.With the increase of FPA-3 emulsion mass fraction,the surface tension and height of capillary imbibition of FPA-3 solution decreased,while the discharge rate and water contact angle increased.When the emulsion mass fraction was both 2.0%,compared with those of PA aqueous solution,the surface tension of FPA-3 aqueous solution decreased by 50.70% from 46.01 mN/m to 22.68 mN/m, the discharge rate increased by 48.16% from 19.89% to 29.47%, and the surface free energy of the core decreased from 73.2 mN/m to 8.7 mN/m. The core changed from hydrophilicity (θ=69.8°) to hydrophobicity (θ=125.1°). The height of the capillary self-imbibition liquid surface of FPA-3 aqueous solution with mass fraction of 2.0% was reduced from 42 mm (water) to 30 mm.

关 键 词：致密砂岩 表面自由能 接触角 疏水 表观稳定性 润湿性逆转 

分 类 号：TE343[石油与天然气工程—油气田开发工程]