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分子沉积(MD)膜驱油技术是依靠MD膜驱剂分子在油藏体系的各种界面上通过静电作用形成单层MD膜释放热量,从而提高原油采收率的新型技术。利用静态吸附法研究了不同pH值下MD-1膜驱剂在石英砂上的静电吸附特性,并进行吸附动力学和热力学分析。实验结果表明,MD-1膜驱剂在石英砂上的吸附主要由静电作用引起的,其吸附量随着pH值的增加而增大。动力学计算表明,pH值越高,石英砂表面所带负电越多,对MD-1膜驱剂吸附的活化能越低,吸附MD-1膜驱剂的速度越快;热力学计算表明,MD-1膜驱剂在石英砂上的吸附受pH值影响较大。pH值越高,石英砂表面所带负电越多,石英砂与MD-1膜驱剂间的静电引力越大,MD-1膜驱剂在石英砂上的理论饱和吸附量越大,吸附放热越多。
Molecular deposition (MD) membrane flooding technology is a new technique that enhances oil recovery by relying on the formation of single-layer MD films by electrostatic interaction of MD film-displacing molecules in various interfaces of a reservoir system to release heat. The static adsorption method was used to study the electrostatic adsorption characteristics of MD-1 membrane flooding agent on quartz sand under different pH values. The adsorption kinetics and thermodynamics were also studied. The experimental results show that the adsorption of MD-1 membrane flooding agent on quartz sand is mainly caused by electrostatic interaction, and its adsorption capacity increases with the increase of pH value. The kinetic calculations show that the higher the pH is, the more negative charges the quartz sand surface carries. The lower the activation energy is, the faster the MD-1 membrane flooding agent is adsorbed. The thermodynamic calculation shows that MD -1 membrane flooding on quartz sand adsorption by the pH value of a larger impact. The higher the pH value, the more negative charge the quartz sand surface carries. The greater the electrostatic attraction between the quartz sand and the MD-1 film drive agent, the larger the theoretical saturated adsorption capacity of MD-1 film drive agent on quartz sand, more.