HPAM溶液增粘方法研究及驱油效果评价

发布时间：2018-02-22 18:12

本文关键词： 部分水解聚丙烯酰胺粘度络合剂抗氧化剂　出处：《东北石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：目前,聚合物驱提高原油采收率技术在国内油田得到了较为广泛的应用。部分水解聚丙烯酰胺(HPAM)因其良好的增粘性而被广泛应用于各大油田驱油项目中。但是,在较高的二价金属离子浓度下,HPAM水溶液会降解,且其分子中的羧基与钙、镁等二价离子结合,形成絮凝、沉淀,发生相分离;同时,聚合物水溶液中的溶解氧会同样使HPAM水溶液发生氧化降解,这些降解作用致使HPAM水溶液粘度降低,最终导致驱油效果明显变差。本文分析和研究了聚合物浓度、温度、pH值、矿化度、二价离子浓度、溶解氧对HPAM水溶液粘度及其稳定性的影响规律。此基础上提出了聚合物驱油剂与添加剂协同作用提高原油采收率的新方法,基于络合反应原理利用络合剂去除HPAM水溶液中的高价金属阳离子,提高HPAM水溶液的粘度;通过添加抗氧化剂降低HPAM的氧化降解程度,提高HPAM水溶液粘度的稳定性。通过对4种络合剂及3种抗氧化剂进行优选实验,发现添加210mg/LDE草酸钠作为络合剂可以有效的提高HPAM水溶液初始粘度33.2%;添加硫代硫酸钠作为抗氧化剂,在老化时间为30d时HPAM水溶液的粘度保留率可以达到65.5%。室内驱油实验结果表明:经络合剂及抗氧化剂处理后的模拟水配制的HPAM水溶液化学驱采收率可以提高3.5%,对于高价阳离子含量高的油田开展聚合物驱油技术具有十分重要的意义。
[Abstract]:At present, polymer flooding enhanced oil recovery technology in the domestic oil field has been widely used. Partially hydrolyzed polyacrylamide (HPAM) because of its good viscidity and is widely used in the oil field flooding project. However, in two valence metal ions concentration, HPAM solution will degrade, and the carboxyl group with calcium in the molecule, magnesium and other two valent ion binding, formation of flocculation, sedimentation, phase separation; at the same time, the dissolved oxygen polymer in aqueous solution will also enable the aqueous solution of HPAM oxidative degradation, the degradation of the HPAM aqueous solution viscosity decreased, resulting in flooding effect gets worse. This paper analysis and study of polymer concentration, temperature, pH value, salinity, concentration of two valence ions, effect of dissolved oxygen on the viscosity and stability of aqueous solution of HPAM. Based on this oil agent and additive synergistic effect to improve the original polymer flooding A new method for oil recovery, the complexation reaction by using the principle of complexing agent removal of metal cations in aqueous solution based on HPAM, to improve the viscosity of HPAM solution by adding antioxidants; reduce the degradation of HPAM, improve the stability of the viscosity of the aqueous solution of HPAM. Through the optimization experiments on 4 kinds of complexing agents and 3 kinds of antioxidants, found adding sodium oxalate 210mg/LDE as complexing agent can effectively improve the initial viscosity of 33.2% HPAM aqueous solution; adding sodium thiosulfate as antioxidant in the aging time of 30d HPAM aqueous solution viscosity retention rate can reach to 65.5%. laboratory displacement experiment results show that the HPAM aqueous solution chemical simulated water mixture and meridian after treatment with antioxidants recovery rate can be increased by 3.5%, the high valence cation with high content of oilfield polymer flooding technology has very important significance.

【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.46

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