新型缓蚀起泡剂的配方筛选与性能机理研究

New Corrosion Inhibitor Formulation Screening and Performance Mechanism Research

气井积液和腐蚀是油气田生产急需解决的问题之一。本文以LHSB、CAO-40和水溶性咪唑啉等为主剂,三乙醇胺、互溶剂等为助剂,通过复配,获得了一种兼具缓蚀和起泡功能的新型一体化缓蚀型起泡剂配方。通过优化筛选,获得的最佳配方为:12.25%水溶性咪唑啉+45.5%CAO-40+12.25%LHSB+8%乙二醇单丁醚+5%水+5%三乙醇胺+5%EDTANa_(2)+7%十六烷基三甲基氯化铵。性能研究结果表明,获得的最佳配方体系具有良好的起泡和缓蚀性能,携液率在65%以上,缓蚀率在85%以上,且具有良好的抗凝析油性能。缓蚀起泡机理研究结果表明,缓蚀型起泡剂具有较好的表面活性,表面张力可降低至32.7m N·m^(-1),形成的气泡液膜较厚,有利于泡沫稳定。缓蚀机理研究表明,该缓蚀型起泡剂在金属表面上的吸附符合Langmuir吸附机理,是一种以抑制阳极为主的混合型吸附缓蚀剂。

Gas well fluid accumulation and corrosion was one of the urgent problems in oil and gas field production.LHSB,CAO-40 and water-soluble imidazoline were used as the main agents,combined with triethanolamine,inter-solvent and other additives,a new integrated corrosion inhibiting and foaming agent formulation was obtained.The best formulation was obtained by optimization screening:12.25% water-soluble imidazoline+45.5%CAO-40+12.25%LHSB+8% ethylene glycol monobutyl ether+5% water+5% triethanolamine+5%EDTANa2+7% hexadecyl trimethyl ammonium chloride.The results of the performance study showed that the best formulation system obtained had good foaming and corrosion inhibition performance,in which the liquid-carrying rate was more than 65%,the corrosion inhibition rate was more than 85%,and had good anti-condensation oil performance.The results of the corrosion inhibition foaming mechanism study showed that the corrosion inhibition foaming agent had good surface activity,surface tension could be reduce to 32.7 mN/m,the formation of a thicker bubble film was conducived to foam stability.Corrosion inhibition mechanism study showed that the corrosion inhibition foaming agent adsorption on the metal surface in line with the Langmuir adsorption mechanism,was a mixed type of adsorption inhibition inhibiting anodic corrosion inhibitors.