缓膨耐盐性纳米复合凝胶颗粒的合成及性能研究
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摘要
通过AM/AMPS在水溶液中共聚,并向凝胶体系中引入锂皂石纳米颗粒,制备了缓膨耐盐的纳米复合凝胶颗粒(NCPG)。考察了单体质量比、纳米颗粒质量分数、交联剂和引发剂的质量分数对凝胶颗粒吸水性能的影响,优化出最佳配方为:m(AM)∶m(AMPS)=18∶2,锂皂石质量分数为0.75%,交联剂质量分数为0.05%,引发剂质量分数为0.05%。性能研究实验结果表明,NCPG具有p H敏感性、缓膨性以及耐温耐盐性。在碱性水中NCPG具有较高的膨胀倍数;常温下NCPG膨胀倍数较低,而在80℃下膨胀倍数会大幅增加,且在80℃下矿化度为81 521.2 mg/L的地层水中稳定吸水膨胀18.1倍,并保持稳定30 d以上,可满足油藏温度80℃以上的高盐油藏深部调剖需求。
Nanocomposite gel particles(NCGP) with characteristics of salt tolerance and retarding swelling is synthesized through copolymerization between acrylamide(AM) and 2-acrylamido-2-methylpropane sulfonic acid(AMPS) in water solution,with addition of laponite nano-particle in formed gel system.The effects of mass ratio between monomers,concentration of laponite and mass fractions of crosslinker and initiator on the swelling performance of gel particles are studied.The optimum formulation is obtained as follows:m(AM)∶m(AMPS)=18∶2 and the mass fractions of laponite,crosslinker and initiator are 0.75%,0.05% and 0.05% respectively.In addition,the performance evaluation experiment result indicates that the gained NCPG is sensitive to p H and exhibits characteristics of retarding swelling,temperature resistance and salt tolerance.It shows high swelling times in weak alkaline water.Its swelling rate is low at room temperature while increases greatly at 80℃.It can swell 18.1 times in formation water with a mineralization 81,521.2 degree of mg·L-1 at 80℃ and keeps this swelling rate steady in 30 days.This NCPG can meet the requirements of high salinity reservoir with temperature above 80℃.
Nanocomposite gel particles(NCGP) with characteristics of salt tolerance and retarding swelling is synthesized through copolymerization between acrylamide(AM) and 2-acrylamido-2-methylpropane sulfonic acid(AMPS) in water solution,with addition of laponite nano-particle in formed gel system.The effects of mass ratio between monomers,concentration of laponite and mass fractions of crosslinker and initiator on the swelling performance of gel particles are studied.The optimum formulation is obtained as follows:m(AM)∶m(AMPS)=18∶2 and the mass fractions of laponite,crosslinker and initiator are 0.75%,0.05% and 0.05% respectively.In addition,the performance evaluation experiment result indicates that the gained NCPG is sensitive to p H and exhibits characteristics of retarding swelling,temperature resistance and salt tolerance.It shows high swelling times in weak alkaline water.Its swelling rate is low at room temperature while increases greatly at 80℃.It can swell 18.1 times in formation water with a mineralization 81,521.2 degree of mg·L-1 at 80℃ and keeps this swelling rate steady in 30 days.This NCPG can meet the requirements of high salinity reservoir with temperature above 80℃.
引文
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[3]唐山,孙丽萍,蒲万芬,等.体膨颗粒深部调剖技术研究[J].应用化工,2012,41(5):771-773.
[4]宋官龙.耐温耐盐预交联交联凝胶颗粒的性能研究[J].现代化工,2016,36(7):100-103.
[5]李东旭,侯吉瑞,赵凤兰,等.预交联颗粒调剖性能及粒径与孔隙匹配研究[J].石油化工高等学校学报,2010,23(2):25-29.
[6]Imqam A,Wang Z,Bai B.Preformed-particle-gel transport through heterogeneous void-space conduits[J].SPE J,2017,22(5):1437-1447.
[7]马红卫,刘玉章,李宜坤,等.柔性转向剂在多孔介质中的运移规律研究[J].石油钻采工艺,2007,29(4):80-83.
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