在油田开发中,颗粒凝胶可用于堵水,以控制含水和封堵高渗层窜流,从而提高采收率.研究了纳米蒙脱土(Na-MMT)黏土在增强预成型颗粒凝胶(R-PPGs)中的强化作用.以丙烯酰胺为单体、N,N-亚甲基双丙烯酰胺为交联剂、过硫酸钾(KPS)为还原剂、纳米Na-MMT为强化材料,合成了R-PPGs.采用X射线衍射、核磁共振、场发射扫描电镜和能量色散 X 射线能谱对合成的 R-PPG 进行了物理和化学表征.研究结果表明:Na-MMT黏土的平均粒径约为(368±20)nm,纳米黏土对PPG的基体有强化效果,δ=179.90 和δ=41.89处始观察到2 个峰对应酰胺基的羰基和脂肪族基团.纳米黏土强化PPG中有致密网状结构,其热稳定性较好.
Synthesis and Performance Evaluation of Particle Gel Polymers for Water Plugging Reinforcement in Inhomogeneous Reservoirs
In oilfield development,particulate gels can be used for water plugging to control water content and seal off high-permeability formation runoff for enhanced recovery.In this paper,the reinforcing role of nanomontmorillonite(Na-MMT)clay in reinforced preformed particulate gels(R-PPGs)was investigated.R-PPGs were synthesized using acrylamide as monomer,N,N-methylenebisacrylamide as cross-linking agent,potassium persulfate(KPS)as reducing agent,and nanoNa-MMT as reinforcing material.The synthesized R-PPGs were physically and chemically characterized using X-ray diffraction,nuclear magnetic resonance(NMR),field emission scanning electron microscopy(FESEM),and energy-dispersive x-ray spectroscopy(EDSX).The results showed that the average particle size of Na-MMT clay was about(368±20)nm,and the nanoclay had a reinforcing effect on the matrix of the PPGs,with two peaks corresponding to the carbonyl and aliphatic groups of the amide group observed at δ=179.90 and δ=41.89.Meanwhile,there was dense mesh structure in the nanoclay-reinforced PPG,and its thermal stability was better.
Water pluggingGel polymerNano-montmorilloniteSynthesisPerformance evaluation
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