甲烷在三元复合液中的溶解度及表观溶解常数研究

A STUDY ON SOLUBILITY AND EQUILIBRIUM DISSOLUTION CONSTANT OF METHANE IN ASP FLOODING SOLUTION

在 35— 75℃和 2 4— 2 4 0bar( 2 .4— 2 4MPa)范围内 ,实验测定了甲烷在三元复合驱油液 (碱 表面活性剂 聚合物溶液 )中的溶解度。结果表明 ,甲烷在三元复合驱油液中的溶解特性与在盐溶液中相似 ,但在相同温度、压力下 ,三元复合驱油液比纯水和盐溶液对甲烷有更强的溶解能力。根据实验结果提出了胶束增溶机理。建立了甲烷在三元复合驱油液中的表观溶解常数 (Ka)与温度 (T)的关系式 :lnKa=754.99/T - 1 3.81 8。该方程结合其它参数方程 ,使理论计算甲烷在三元复合驱油液中的溶解度成为现实。

The solubility of methane in alkaline surfactant polymer(ASP) follding solution(formulated for use in Daqing Oil Fields) has been determined in the range of temperature 35-75℃ and of pressure 24-240 bar. At equal temperature and pressure conditions the ASP solution dissolves more methane than pure water and salt solution do although the nature of dissolution is similar in these cases. A micelle solubilization mechanism is proposed to explain the enhancement in solubility of methane in ASP solution. A relationship between equilibrium constant, K a, of dissolution reaction and temperature, T , is deduced as ln K a=754.99/ T -13.818. By using this and other equations, the solubility of methane in ASP solution can be calculated.