【摘要】 为了改善储层的非均质性差异,有效提高碳酸盐储层的酸化解堵效果,以长链烷基二甲基叔胺、3-氯-2-羟基丙烷磺酸钠和1,4-二溴丁烷为原料,通过两步反应合成了一系列磺基甜菜碱双子表面活性剂（2C_n-SGS,其中n为疏水链中碳原子数,n=12,14,16,18）自转向酸主剂。以2C₁₆-SGS为例,采用FTIR对中间产物(C₁₆-SGS)及2C₁₆-SGS的结构进行表征。通过表面张力法测定2C_n-SGS的表面活性,结果表明,2C_n-SGS具有良好的表面活性,随着疏水链的增长,2C_n-SGS的CMC和表面张力均减小,且胶束化能力增强。可用于黏弹性表面活性剂自转向酸酸化技术,具有良好的转向分流能力,优选配方为4%2C₁₆-SGS+20%盐酸+20%Ca²⁺,而且高黏胶束遇煤油等烃类能够自动破胶降黏,易返排对地层无伤害。更多还原

【Abstract】 In order to change the heterogeneity difference, improve the acidizing and unplugging effect of carbonate reservoir, a series of sulfobetaine Gemini surfactants（2C_n-SGS, where n is the number of carbon atoms in the hydrophobic chain, n=12, 14, 16, 18） were synthesized by a two-step reaction using long chain alkyl dimethyl tertiary amine, 3-chloro-2-hydroxypropane sulfonic acid sodium and 1,4-dibromobutane as raw materials. Taking 2C₁₆-SGS as an example, the structures of mid product(C₁₆-SGS)and 2C₁₆-SGS were characterized by FTIR. Surface activity of 2C_n-SGS was analyzed by surface tension method. The results show that 2C_n-SGS have good surface activity, and the CMC and surface tensions of 2C_n-SGS decrease with the increase of hydrophobic chain, and the micellization ability is enhanced. It can be used in viscoelastic surfactant self-steering acidification technology, with good steering and shunting ability. The optimal formula is 4% 2C₁₆-SGS+20% hydrochloric acid + 20% Ca²⁺. The high viscosity gel of acidizing system is easy to break when mixing with hydrocarbons such as kerosene. It is easy to backflow and has no damage to the formation.更多还原