高温高盐油藏空气驱起泡剂研制及性能评价

为筛选适合高温高盐油藏的起泡剂,对烷基二苯醚二磺酸盐(2A1)、α-烯烃磺酸盐(AOS)、羧甲基聚氧乙烯烷基醇醚(AEC10)以及6种甜菜碱表面活性剂进行起泡性能研究。结果表明:2A1、AOS和AEC10的发泡率低、泡沫稳定性差;甜菜碱表面活性剂中含酰胺基的羟磺基甜菜碱的发泡率高,不含酰胺基的羟磺基甜菜碱的泡沫稳定性好;同类甜菜碱表面活性剂中碳链长的稳泡性能好,碳链短的发泡率高;复配碳链长度不同的羟磺基甜菜碱得到泡沫性能良好的复合起泡剂S11和S12,并对其进行热稳定性评价,发现分子中含酰胺基的S11在110 ℃下具有较好的热稳定性,而分子中不含酰胺基的S12在130 ℃下热稳定性较好。研究结果对高温高盐油藏起泡剂的选择具有理论指导意义。

Development and Performance Evaluation of Foaming Agent for Air Flooding in Reservoirs with High Temperature and Salinity

To select foaming agents applicable to reservoirs with high temperature and salinity, foaming performance studies were conducted on alkyl diphenyl ether disulfonate (2A1), alpha olefin sulfonate (AOS), carboxymethyl polyoxyethylene alkyl ether (AEC10) and six betaine surfactants. The results showed that, 2A1, AOS and AEC10 had low foaming rate and poor foam stability; among betaine surfactants, the hydroxysulfobetaine with amide groups was high in foaming rate and the hydroxysulfobetainehas without amide groups was sound in foaming performance; among similar betaine surfactants, the surfactants with long carbon chain had good foam stability and the surfactants with short carbon chain had high foaming rate; the hydroxysulfobetaine with different carbon chain lengths was compounded to obtain compound foaming agents S11 and S12 with excellent foaming performance, and their thermal stability was evaluated; it was found that S11 with amide groups had better thermal stability at 110 ℃, and S12 without amide groups had better thermal stability at 130 ℃. The study results provide a theoretical guidance for the selection of foaming agents applicable to reservoirs with high temperature and salinity