新型磺酸基Gemini表面活性剂的合成及其在油气井中的应用性能

Synthesis of a novel sulfate Gemini surfactant and its application in oilfield

以油酸酰胺丙基叔胺、3-氯-2-羟基丙磺酸钠和1,4-二溴丁烷为原料,通过两步反应合成了一种甜菜碱双子表面活性剂B18-4-18,通过傅里叶变换红外光谱仪和核磁共振波谱仪对合成产物进行了结构表征,用表面张力仪测定不同浓度下的双子表面活性剂(B18-4-18)的表面张力,用携液率装置测定了其在清水中、矿化水中、凝析油溶液中、甲醇溶液中的携液率,用罗氏泡高仪测定不同类型表面活性剂的泡沫高度。结果表明:合成产物与预期目标产物结构一致,在25℃时,B18-4-18的临界胶束浓度CMC为5.0×10^(–6)mol/L,相应的表面张力γcmc为31.67mN/m;质量分数为0.5%的B18-4-18在清水、矿化水、凝析油溶液、甲醇溶液中的最高携液率分别可以达到90%、87%、78%、87%;对比不同的表面活性剂的泡沫性能,优选出在泡沫酸中使用最佳的起泡剂为B18-4-18。

A type of betaine Gemini surfactant(B18-4-18)was synthesized by two-step reaction with N-(3-dimethylaminopropyl)oleoylamide,3-chloro-2-hydroxypropanesulfonate,and 1,4-dibromobutane as main raw materials.The structure of the product was characterized by Fourier transform infrared spectroscopy and 1H nuclear magnetic resonance spectrum.The surface tension curve and related parameters were acquired by surface tension measurements.Liquid carrying rates of B18-4-18 were measured by carrying capacity ratio measurement device in water,mineralized water,methanol solution,and condensate solution,respectively.The foam heights with different types of surfactants were determined by a Roche bubble instrument.The experimental results showed that the structure of the synthesized compounds was in conformity with the expected structure of surfactant.The critical micelle concentration of B18-4-18 was 5.0×10–6mol/L;the corresponding surface tension was 31.67mN/m at 25℃.The highest carrying capacities of the B18-4-18 with the mass fraction of 0.5%were 90%,87%,78%and 87%in water,in mineral water,in methanol solution and in condensate solution,respectively.In contrast to the foaming properties of other surfactants,for the foam acid,the best foaming agent is the B18-4-18.