疏水修饰纳米颗粒强化天然气泡沫的稳定性及影响因素

Stability of Natural Gas Foam Enhanced by Hydrophobically Modified Nanoparticle and Its Influencing

为了增强天然气泡沫在提高采收率中的应用效果,采用注射法研究了疏水修饰纳米颗粒(HMNP)与不同类型表面活性剂复合生成的天然气泡沫的稳定性及温度、无机盐(NaCl、CaCl_(2))对天然气泡沫稳定性的影响机制。结果表明:在室温(25℃)纯水条件下,HMNP与阴离子表面活性剂(十二烷基磺酸钠(SDS)、十二烷基苯磺酸钠(SDBS)、十二烷基聚氧乙烯醚硫酸钠(AES))复合体系生成的天然气泡沫在3000 min内可保持很好的稳定性,具有显著协同稳定天然气泡沫稳定性的作用。而且,在50℃条件下或离子强度为0.2 mol/L的情况下,阴离子表面活性剂中的聚氧乙烯(EO)基团可以进一步增强HMNP/AES复合体系天然气泡沫的稳定性及耐温耐盐性;阴离子表面活性剂中的苯环则可显著促进HMNP与阴离子表面活性剂的协同效应,更大幅度提高HMNP/SDBS复合体系天然气泡沫的稳定性、耐温性及耐一价金属离子能力。

To enhance the application effect of natural gas foam in oil recovery,the stability of natural gas foam generated by the combination of hydrophobic modified nanoparticle(HMNP)and different types of surfactants and the influence of temperature and inorganic salts(NaCl,CaCl_(2))on the stability of natural gas foam were studied by injection method.The results showed that,under the condition of pure water at room temperature of 25℃,the natural gas foam generated by the composite system of HMNP and anionic surfactants(sodium dodecyl sulfonate(SDS),sodium dodecyl benzene sulfonate(SDBS),sodium dodecyl polyoxyethylene ether sulfate(AES))could maintain good stability within 3000 min,and had a significant synergistic effect on stabilizing the stability of natural gas foam.Moreover,at high temperature of 50℃or in the presence of mineral ions,ionic strength being of 0.2 mol/L,the polyoxyethylene(EO)group in the anionic surfactant could further enhance the stability,temperature resistance and salt resistance of HMNP/AES composite natural gas foams;the benzene ring in the anionic surfactant significantly promoted the synergistic effect of HMNP and anionic surfactant,and could significantly improve the stability,temperature resistance and monovalent ion resistance of HMNP/SDBS composite natural gas foam.