基于新型纳米二氧化硅胶凝剂的酸化液性能分析  

Performance analysis of acidizing fluid based on new nano-silica gelling agent

作　　者：李强 王福玲[1,2,3] 李庆超[2,3,4] 吴静娟 王彦玲 LI Qiang;WANG Fuling;LI Qingchao;WU Jingjuan;WANG Yanling(Faculty of Engineering,China University of Petroleum-Beijing at Karamay,Xinjiang Karamay 834000,China;School of Petroleum Engineering,China University of Petroleum(East China),Shandong Qingdao 266580,China;Key Laboratory of Unconventional Oil&Gas Development,Ministry of Education,China University of Petroleum(East China),Shandong Qingdao 266580,China;School of Energy Science and Engineering,Henan Polytechnic University,Henan Jiaozuo 454000,China)

机构地区：[1]中国石油大学(北京)克拉玛依校区工学院,新疆克拉玛依834000 [2]中国石油大学(华东)石油工程学院,山东青岛266580 [3]中国石油大学(华东)非常规油气开发教育部重点实验室,山东青岛266580 [4]河南理工大学能源科学与工程学院,河南焦作454000

出　　处：《非常规油气》2025年第2期120-127,共8页Unconventional Oil & Gas

基　　金：国家自然科学基金重点项目“超深井安全高效井筒工作液构建及调控方法基础研究”(U1762212);山东省重点研发计划项目“底水稠油二氧化碳非混相驱技术研究”(2022CXGC020303)。

摘　　要：为改善普通酸化液在超深页岩储层高温环境下耐温耐剪切性能低的问题,以纳米二氧化硅、N-乙基丙烯酰、N-烯丙基对甲苯磺酰胺和辛基酚聚氧乙烯醚为原料,制备了一类耐高温、耐剪切的纳米二氧化硅胶凝剂NSJ,并研究了胶凝剂含量、储层温度、储层压力和二氧化硅含量对酸化液表观黏度与溶蚀速率的影响。结果表明,在180℃和170 s^(-1)剪切60 min可使含1%HNJ胶凝剂和20%盐酸的酸液表观黏度和黏度保持率达到55 mPa·s和89%,远高于市售胶凝剂SJ的14 mPa·s和46%。此外,纳米二氧化硅胶凝剂NSJ的酸液在60 min内的溶蚀速率仅为5.4 mg/s,远低于市售胶凝剂SJ的7.5 mg/s。纳米二氧化硅胶凝剂NSJ具有比市售胶凝剂更优异的缓蚀和黏度保持性能。To improve the low temperature resistance and shear resistance of ordinary acidizing fluid in the high temperature environment of ultra-deep shale reservoirs,a kind of heat-resistant and shear-resistant nano-silica gelling agent NSJ was prepared with nano-silica,N-ethylacryloyl,N-allyl-p-toluenesulfonamide and octylphenol polyoxyethylene ether,and the effects of gelling agent content,reservoir temperature,reservoir pressure and silica content on the apparent viscosity and dissolution rate of acidizing fluid were studied.The results show that the apparent viscosity and viscosity retention rate of the acid solution containing 1% HNJ gelling agent and 20% hydrochloric acid can reach 55 mPa·s and 89% at 180 ℃ and 170 s^(-1) for 60 min,which are much higher than those of commercial gelling agent SJ(14 mPa·s and 46%).In addition,the dissolution rate of acid solution of nano-silica gelling agent NSJ in 60 minutes is only 5.4 mg/s,which is far lower than 7.5 mg/s of commercial gelling agent SJ.Nano-silica gel gelling agent NSJ shows better corrosion inhibition and viscosity retention performance than commercially available gelling agents.

关 键 词：超深高温页岩储层 酸化压裂 胶凝酸液 耐温耐剪切 黏度保持 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]