线型酚醛树脂交联P(AM-co-AMPS)暂堵剂的制备及耐温耐盐性能
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摘要
针对缝洞型油藏长期水驱开采造成的油水同出问题,设计开发了一套耐温耐盐的化学胶塞用剂体系。以低相对分子质量聚合物P(AM-co-AMPS)代替目前常用的高相对分子质量聚丙烯酰胺,线型酚醛树脂作交联剂,研究了聚合物和交联剂的不同加量对体系黏度、成胶时间和凝胶强度的影响及体系的耐温抗盐性。研究结果表明,随聚合物用量和交联剂用量增加,体系黏度增加,成胶时间缩短,凝胶强度提高,该体系可根据地层条件调整试剂用量,以满足不同地质条件的堵水作业。凝胶产物的TG和DSC测试结果显示凝胶具有良好的热稳定性。该体系具有优良的耐温抗盐性能,P(AM-co-AMPS)用量4.8%、酚醛树脂用量10%时所形成的凝胶产物在环境温度120℃、矿化度22×104mg/L的模拟地层水中48 h不降解。
The problem of producing both oil and water is caused by long-term waterflooding in the fractured-cavity carbonate reservoirs. To solve the problem,low molecular weight polymer was used in this paper to replace high molecular weight polyacrylamide which was commonly used as blocking agent,and novolac resin used as crosslinker. The effects of dosage of polymer and crosslinker on the viscosity,gelation time and gel strength were investigated,as well as high temperature and salt resistance. The results showed that with the increase of polymer dosage and crosslinker dosage,the viscosity of the system increased,the gelation time shortened and the gel strength enhanced. The results of TG and DSC indicated that the system had good thermal stability. The system had good temperature-resistance and salt-resistance. The gel product,prepared with 4.8% of P(AM-co-AMPS)and 10% of phenolic resin,did not degrade when soaked in the simulated formation water with the mineralization of 22×104 mg/L for 48 h at the temperature of 120℃
The problem of producing both oil and water is caused by long-term waterflooding in the fractured-cavity carbonate reservoirs. To solve the problem,low molecular weight polymer was used in this paper to replace high molecular weight polyacrylamide which was commonly used as blocking agent,and novolac resin used as crosslinker. The effects of dosage of polymer and crosslinker on the viscosity,gelation time and gel strength were investigated,as well as high temperature and salt resistance. The results showed that with the increase of polymer dosage and crosslinker dosage,the viscosity of the system increased,the gelation time shortened and the gel strength enhanced. The results of TG and DSC indicated that the system had good thermal stability. The system had good temperature-resistance and salt-resistance. The gel product,prepared with 4.8% of P(AM-co-AMPS)and 10% of phenolic resin,did not degrade when soaked in the simulated formation water with the mineralization of 22×104 mg/L for 48 h at the temperature of 120℃
引文
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[17] BISWAL D R,SINGH R P. Characterisation of carboxymethyl cellulose and polyacrylamide graft copolymer[J]. Carbohydr Polym,2004(57):379-387.
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[3]李阳,侯加根,李永强.碳酸盐岩缝洞型储集体特征及分类分级地质建模[J].石油勘探与开发,2016,43(4):600-606.
[4]白宝君,周佳,印鸣飞.聚丙烯酰胺类聚合物凝胶改善水驱波及技术现状及展望[J].石油勘探与开发,2015,42(4):481-487.
[5] YADAV U S,MAHTO V. Experimental studies,modeling and numerical simulation of gelation behavior of a partially hydrolyzed polyacrylamide-hexamine-pyrocatechol polymer gel system for profile modification jobs[J]. Int J Adv Petrol Eng Technol,2012,1(1):1-16.
[6] JIA Hu,ZHAO Jinzhou,JIN Fayang,et al. New insights into the gelation behavior of polyethyleneimine cross-linking partially hydrolyzed polyacrylamide gels[J]. Ind Eng Chem Res,2012,51:12155-12166.
[7] SINGH R,MAHTO V. Preparation,characterization and coreflood investigation of polyacrylamide/clay nanocomposite hydrogel system for enhanced oil recovery[J]. J Macromol Sci,Part B,2016,55(11):1051-1067.
[8]姚普勇.高浓度高分子量部分水解聚丙烯酰胺与低黏纤维素共混堵漏体系性能评价[J].油田化学,2017,34(3):412-416.
[9] ZHANG Jian,HE Hong,WANG Yefei,et al. Gelation performance and microstructure study of chromium gel and phenolic resin gel in bulk and porous media[J]. J Energy Resour Technol,2014,136:042910.
[10] ZHAO Guang,DAI Caili,CHEN Ang,et al. Experimental study and application of gels formed by nonionic polyacrylamide and phenolic resin for in-depth profile control[J]. J Petrol Sci Eng,2015,135:552-560.
[11]杨昌华,王斌,董俊艳,等.耐温抗盐水平井封堵体系研究与应用[J].油田化学,2016,33(4):648-652.
[12]孙立梅,李明远,彭勃,等.水溶性酚醛树脂的合成与结构表征[J].石油学报(石油加工),2008,24(1):63-68.
[13]唐孝芬,李红艳,刘玉章,等.交联聚合物冻胶调堵剂性能评价指标及方法[J].石油钻采工艺,2004,26(2):49-53.
[14] YADAV L D S. Organic Spectroscopy[M]. Dordrecht:Kluwer Academic Publishers,2005.
[15] GONZALEZ M G,CABANELAS J C,BASELGA J. Applications of FTIR on Epoxy Resins-Identification,Monitoring the Curing Process,Phase Separation and Water Uptake[M]//Theophanides Theophile. infrared Spectroscopy-Materials Science,Engineering andTechnology.Croatia:InTechEurope,2012.
[16]李淑君,陶毓博,李坚,等.用TG-DSC-FTIR联用技术研究酚醛树脂的热解行为[J].东北林业大学学报,2007,35(6):56-58.
[17] BISWAL D R,SINGH R P. Characterisation of carboxymethyl cellulose and polyacrylamide graft copolymer[J]. Carbohydr Polym,2004(57):379-387.