摘要
针对水基钻井液钻遇高温高矿化度地层时滤失量大、流变性控制难等问题,开展了抗温抗盐降滤失剂的研究。以丙烯酰胺(AM)、丙烯酸(AA)、2-乙丙烯酰胺基-2-甲基丙磺酸(AMPS)和N-乙烯基-2-吡咯烷酮(NVP)为单体,采用反相乳液聚合法制备一种抗温抗盐乳液聚合物降滤失剂。正交试验确定其最佳合成条件为n(AM)∶n(AA)∶n(AMPS)∶n(NVP)=3∶2∶0.5∶0.4,HLB=4.5,反应温度为50℃,反应时间为5 h。在该条件下合成出降滤失剂LX-28。其红外光谱分析表明4种单体均参与反应,热重分析显示其功能性基团开始降解温度为345℃。在淡水浆和复合盐水浆中评价了LX-28与同类产品的抗温抗盐降滤失性。结果显示,LX-28在淡水浆中抗温达220℃,抗盐至饱和,且滤失量降低率远高于同类产品;在复合盐水浆中抗温达200℃,滤失量降低率80.6%以上,优于同类产品。电镜扫描滤饼分析其微观形貌,揭示了LX-28的降滤失机理。
A study on anti-temperature and anti-salt emulsion filtrate loss reducers was carried out to solve the problems of high filtration loss and difficult rheological control when water-based drilling fluid was drilled in high-temperature and high mineralization formations.An anti-temperature and anti-salt emulsion filter loss reducer was prepared by reverse-phase emulsion polymerization using acrylamide(AM),acrylic acid(AA),2-ethylacryl amido-2-methyl propane sulfonic acid(AMPS),N-vinyl-2-pyrrolidone(NVP)as monomers.The optimal synthesis conditions were determined by orthogonal tests as follows:n(AM)∶n(AA)∶n(AMPS)∶n(NVP)=3∶2∶0.5∶0.4,HLB=4.5;The reaction temperature was 50℃;The reaction time was 5 h.The emulsion polymerizer LX-28 was synthesized under the above conditions,and its infrared spectrum analysis showed that all four monomers participated in the reaction,and the thermogravimetric analysis showed that the functional groups started to degrade at 345℃.The temperature and salt resistance of LX-28 and similar products were evaluated in freshwater drilling fluids and composite brine drilling fluids.The results show that LX-28 is resistant to temperatures up to 220℃in freshwater slurry,and can resist salt(NaCl)to saturation,and the filtration loss reduction rate is much higher than that of similar products.In compound brine slurry,the temperature resistance reaches 200℃,and the filtration loss reduction rate is over 80.6%,which is better than similar products.Scanning electron microscope analysis of the filter cake reveals the filtration loss reduction mechanism of LX-28.
作者
罗春芝
向欢
章楚君
王怡迪
刘冲
LUO Chunzhi;XIANG Huan;ZHANG Chujun;WANG Yidi;LIU Chong(College of Chemistry&Environmental Engineering,Yangtze University,Jingzhou 434020,Hubei;School of Petroleum Engineering,Yangtze University,Wuhan 430100,Hubei)
出处
《长江大学学报（自然科学版）》
2023年第6期93-102,共10页
Journal of Yangtze University(Natural Science Edition)
基金
国家自然科学基金项目“页岩气开发条件下泥页岩井壁稳定与破裂机理研究”(51174036)。
关键词
降滤失剂
水钻井液
抗温抗盐
抗钙
反相乳液聚合
filtrate loss reducer
drilling fluid
anti-temperature and anti-salt
anti-calcium
reversed-phase emulsion polymerization
