无机盐对阴离子Gemini表面活性剂溶液流变性的 影响及机理
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国家自然科学基金“阴离子双子表面活性剂黏弹流体提高非常规油藏采收率基础研究”(项目编号51774049),国家自然科学基 金“阴离子双子表活剂-纳米粒子构筑耐高温清洁压裂液基础研究”(项目编号51474035)


Effect of Inorganic Salts on Rheological Properties of Anionic Gemini Surfactant Solution and Its Mechanism
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    摘要:

    为探讨无机盐对阴离子双子表面活性剂 GACS416 溶液流变性能的影响及机理,采用 DV2T 黏度计和 MCR 301界面流变仪考察了无机盐类型及浓度对GACS416溶液黏度和黏弹性的影响;并通过动态光散射技术 考察其溶液胶束尺寸变化特征。研究结果表明,加入适量的 NaCl、KCl 可对 GACS416 溶液有效增黏,MgCl2、 CaCl2无增黏效果。NaCl浓度的增加,溶液黏度先增大再减小,而黏弹性由弱变强。随KCl浓度的增加,溶液黏 度先增大后减小,黏弹性不断增强。当NaCl或KCl浓度低于1000 mg/L时可有效增黏,浓度高于1000 mg/L时无 增黏效果。随NaCl浓度的增大,GACS416溶液中胶束的平均水力半径先增大后减小,使溶液黏度和弹性呈先增 大后减小趋势;而随KCl浓度的增大,GACS416溶液中胶束的平均水力半径则逐渐增大,溶液黏度和弹性均相应 增大。NaCl 质量浓度为 500 mg/L 时,GACS416 溶液黏度和黏弹性最好;KCl 质量浓度为 1000 mg/L 时, GACS416溶液的黏度和黏弹性最好。

    Abstract:

    In order to explore the effects of inorganic salts on the rheological properties of anionic Gemini surfactant(GACS416) solution and its mechanism,the influence of inorganic salt type and concentration on the viscosity and viscoelasticity of surfactant solution were measured by DV2T viscometer and MCR 301 interfacial rheometer. The dimensional variations of micelles were studied by dynamic light scattering technique. The experimental results indicated that after adding NaCl and KCl with appropriate concentration,the viscosity of GACS416 solution could be effectively increased,while MgCl2 and CaCl2 has no viscosification effect. With the increase of NaCl concentration,the solution viscosity first increased and then decreased,while the elasticity first weakened and then strengthened. The solution viscosity and viscoelasticity of the solution were the best when the NaCl concentration was 500 mg/L. With the increase of KCl concentration,the viscosity of the solution increased first and then decreased,and the elasticity increased continuously. When NaCl or KCl concentration was lower than 1000 mg/L,the viscosity of the solution could be increased effectively. The microstructure of the solution demonstrated that with the increase of NaCl concentration,the average hydraulic radius of micelles in GACS416 solution first increased and then decreased,and the viscosity and elasticity of the solution first increased and then decreased. However,with the increase of KCl concentration,the average hydraulic radius of micelles gradually increased,and the viscosity and elasticity of the solution also increased correspondently. The solution viscosity and viscoelasticity were the best when the NaCl concentration was 500 mg/L or when the KCl concentration was 1000 mg/L.

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  • 在线发布日期: 2021-07-06
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