摘要
为解决酸压技术副产物酸化油因高黏度、高酸值与难破乳等特性导致的后处理技术难题,对塔河酸化油醇碱萃取原油酸组分进行了FTIR和MS表征,构建了温敏型W/O/W双重乳状液堵水技术体系。以木质素磺酸钠、聚丙烯酰胺、聚氧乙烯山梨糖醇酐单棕榈酸酯和聚乙二醇对异辛基苯基醚为主要原料,合成了油溶性W/O乳化剂KN-1与温敏型水溶性O/W乳化剂KN-2,并分别配制了W/O乳状液和W/O/W乳状液。考察了乳化剂添加量(KN-1以酸化油的质量计、KN-2以地层水的质量计,下同)、含水率和温度对W/O乳状液和W/O/W乳状液界面张力、黏度及稳定性的影响。结果表明,添加量>2%的KN-1可使W/O乳状液油水界面张力降至5 mN/m。添加量3%的KN-1配制的含水率50%的W/O乳状液在130℃高温环境下仍维持2054 mPa·s的高黏度,其分水率在35 d内为0。添加量>4%的KN-2可降低W/O/W乳状液界面张力至5 mN/m;添加量3%的KN-2配制的含水率50%的W/O/W乳状液黏度在常温下<80 mPa·s,且180 min内分水率仅为35%,在130℃下,体系120 min内分水率能迅速升至90%,迅速释放高黏度W/O乳状液实现有效封堵。
To address the technical challenges in post-treatment caused by the high viscosity,high acid value,and strong emulsion stability of acid-crude oil,the byproduct of acid fracturing,a temperaturesensitive W/O/W double emulsion water blocking system was developed based on the analysis on the acidic components via alcohol-alkali extraction of acid-crude oil from Tahe oilfield and characterization by FTIR and MS.Oil-soluble W/O emulsifier KN-1 and temperature-sensitive water-soluble O/W emulsifier KN-2 were synthesized from sodium lignosulfonate,polyacrylamide,sorbitan monopalmitate,and polyethylene glycol mono(2-octylphenyl)ether,and applied to formulate W/O emulsions and W/O/W emulsions respectively,with the influence of emulsifier addition amount(KN-1 based on the mass of acid-crude oil and KN-2 based on the mass of formation water,the same below),moisture content and temperature on the interfacial tension,viscosity and stability of W/O emulsion and W/O/W emulsion evaluated.The results showed that the addition of>2%KN-1 reduced the oil-water interfacial tension of W/O emulsion to 5 mN/m.The W/O emulsion prepared with 3%KN-1 and 50%water retained a high viscosity of 2054 mPa·s even at 130℃,and the system maintained a low water separation rate(0 after 35 d).Similarly,the addition of>4%KN-2 reduced the interfacial tension of W/O/W emulsion to 5 mN/m.The W/O/W emulsion prepared with 3%KN-2 and 50%water exhibited a viscosity below 80 mPa·s at room temperature and a water separation rate of only 35%within 180 min.At 130℃,the system displayed a water separation rate rapidly increasing to 90%within 120 min,effectively releasing the high-viscosity W/O emulsion and achieving efficient water blocking.
作者
石鑫
伍亚军
康博晗
李亮
郭小军
李娇
亢智
吴贝贝
杨矞琦
SHI Xin;WU Yajun;KANG Bohan;LI Liang;GUO Xiaojun;LI Jiao;KANG Zhi;WU Beibei;YANG Yuqi(Sinopec Northwest Oilfield Company Petroleum Engineering Technology Research Institute,Urumqi 830011,Xinjiang,China;Sinopec Key Laboratory for Improving Oil Recovery in Fractured and Caved Reservoirs,Urumqi 830011,Xinjiang,China;School of Engineering,China University of Petroleum-Beijing at Karamay,Karamay 834000,Xinjiang,China;College of Chemical Engineering and Environment,China University of Petroleum-Beijing,Beijing 100100,China)
出处
《精细化工》
2026年第3期660-670,共11页
Fine Chemicals
基金
新疆维吾尔自治区自然科学基金项目(2022D01A126)
新疆维吾尔自治区天山英才项目(2022TSYCCX0057)
中国石油科技创新基金项目(2024DQ02-0148)
中央引导地方科技发展专项资金项目(ZYYD2023A08)
新疆维吾尔自治区重点研发计划项目(2022B01058-2)。
关键词
表面活性剂
酸化油
选择性堵水剂
乳状液稳定性
提高采收率
油田化学品
surfactants
acid-crude oil
selective water blocking agents
emulsion stability
enhance oil recovery
oil filed chemicals
