摘要
随着油井钻探加深,常规减阻剂已不能满足新工况下固井水泥的性能及环保要求。以聚羧酸减水剂聚醚(TPEG-2400)、甲基丙烯磺酸钠(SMAS)、丙烯酸等为原料,通过自由基聚合反应合成一种环保型聚羧酸油井水泥减阻剂(HZ-1)。通过正交实验优化了最佳合成条件;通过红外光谱、核磁共振氢谱、热重及同步热分析仪对HZ-1的结构和热稳定性进行分析;根据石油天然气行业标准对HZ-1的减阻性、抗温性、环保性进行室内评价;通过吸附量、空间位阻、Zeta电位变化探讨HZ-1的减阻作用机理。结果表明,HZ-1的最佳制备条件为:10 g SMAS、0.41 g次磷酸钠、175 g TPEG-2400、7.6 g双氧水、0.91 g抗坏血酸、22.22 g丙烯酸、20 g 20%氢氧化钠,滴加时间为2.0 h,反应温度20℃,反应时间0.5 h。HZ-1的热稳定性良好,分解温度为338℃。将0.40%HZ-1与油井水泥按水灰比0.44配制的水泥浆体系具有较好的减阻性能,流性指数为1.033、稠度系数为0.023 Pa·s^(n)、抗压强度为18.413 MPa,可耐170℃高温。HZ-1的生物降解性好,绿色环保,半数有效浓度(EC_(50))为36307 mg/L,化学需氧量(COD)为571984 mg/L、生化需氧量(BOD_(5))为196330 mg/L,BOD_(5)/COD为0.3432,生物等级为无毒。HZ-1空间位阻越大,水泥浆流变性能越好;HZ-1在水泥颗粒表面的吸附曲线符合Langmuir吸附模型,为单分子层的化学吸附;HZ-1降低了水泥颗粒表面的Zeta电位,增强其静电斥力,从而增强水泥浆的流变性能。
With the deepening of oil well drilling,conventional drag reduction can no longer meet the performance and environmental protection requirements of cementing cement under new working conditions.An environmental polycarboxylate oil well cement drag reducer(HZ-1)was synthesized through free radical polymerization reaction using polycarboxylate superplasticizer polyether(TPEG-2400),sodium methacrylate sulfonate(SMAS),acrylic acid and other raw materials.The optimum synthesis conditions were optimized through orthogonal experiments.The structure and thermal stability of HZ-1 were analyzed by infrared spectroscopy,nuclear magnetic resonance hydrogen spectroscopy,thermogravimetric analysis and synchronous thermal analyzer.Indoor evaluation of the drag reduction,temperature resistance and environmental protection of HZ-1 was conducted according to the standards of oil and gas industry.The drag reduction mechanism of HZ-1 was explored through the changes in adsorption capacity,steric hindrance and Zeta potential.The results showed that the optimum preparation conditions for HZ-1 were obtained as follows:10 g SMAS,0.41 g sodium hypophosphite,175 g TPEG-2400,7.6 g hydrogen peroxide,0.91 g ascorbic acid,22.22 g acrylic acid,20 g 20%sodium hydroxide,dropwise addition time of 2.0 h,reaction temperature of 20℃,and reaction time of 0.5 h.HZ-1 had good thermal stability and a decomposition temperature of 338℃.The cement slurry system prepared by mixing 0.40%HZ-1 with oil well cement at a water cement ratio of 0.44 had good drag reduction performance,the flowability index of 1.033,the consistency coefficient of 0.023 Pa·s^(n),the compressive strength of 18.413 MPa,and the temperature-resistance capacity up to 170℃.HZ-1 had good biodegradability and environmental protection.Its EC_(50)(half effective concentration)was 36307 mg/L,COD(chemical oxygen demand)was 571984 mg/L,and BOD_(5)(biochemical oxygen demand)was 196330 mg/L.The ratio of BOD_(5)/COD was 0.3432.So the biological grade of HZ-1 was non-toxic.The greater the steric hindrance of HZ-1,the better the rheological property of cement slurry was.The adsorption curve of HZ-1 on the surface of cement particles met the Langmuir adsorption model,which was the chemisorption of single molecular layer.HZ-1 reduced the Zeta potential on the surface of cement particles and enhanced its electrostatic repulsion,thus enhancing the rheological properties of cement slurry.
作者
胡耀太
项楠
刘凯
张燕
张兰兰
严思明
李新亮
HU Yaotai;XIANG Nan;LIU Kai;ZHANG Yan;ZHANG Lanlan;YAN Siming;LI Xinliang(School of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,P R of China;Drilling Company of Jianghan Petroleum Engineering Limited Company,Sinopec,Qianjiang,Hubei 524034,P R of China;Sichuan Hongsheng Petroleum Engineering Technology Service Limited Company,Ziyang,Sichuan 641500,P R of China;Sichuan of Biological Engineering and Wuliangye Liquor,Sichuan University of Science and Engineering,Yibing,Sichuan 644002,P R of China;Sichuan Dragon Python Phosphorus Chemical Limited Company,Deyang,Sichuan 618000,P R of China)
出处
《油田化学》
CAS
CSCD
北大核心
2024年第4期588-595,共8页
Oilfield Chemistry
基金
四川省科技计划资助项目“环保型纳米颗粒-多糖杂化聚合物调控深层水基钻井液高温稳定性机理研究”(项目编号2023NSFSC0922)
中国石化科技部项目“顺北油气田一区优快钻井技术研究”(项目编号P18021)
“顺北一区易漏失地层固井技术研究与应用-可酸溶水泥浆堵漏技术评价与优化”(项目编号34400007-19-ZC0607-0127)。
关键词
环保
聚羧酸
减阻剂
水泥
自由基聚合
化学吸附
environmental protection
polycarboxylic acid
drag reducer
cement
free radical polymerization
chemical adsorption
作者简介
胡耀太(1994-),男,西南石油大学化学化工学院材料与化工硕士(2023),从事油田固井外加剂的研究,E-mail:hyt199455@126.com;通讯联系人:严思明(1963-),男,教授,从事油田化学方面的教学和研究工作,通讯地址:610500四川省成都市新都区新都大道8号化学化工学院,E-mail:yansm843@163.com。
