储层多孔介质表面凝析气体混合物的吸附研究

STUDY OF ADSORPTION OF CONDENSATE GAS MIXTURE ON SURFACE OF POROUS MEDIA

凝析气藏流体处于地下多孔介质中 ,由于多孔介质具有巨大的比面积 ,不可避免地会发生吸附现象 ,从而对气藏储量计算、相态模拟计算以及油气井产能计算等气藏工程问题产生影响。为此 ,根据气—固吸附的基本理论 ,在分析研究储层条件下凝析气藏流体在储层多孔介质表面的吸附机理的基础上 ,建立了凝析气混合物在储层多孔介质表面吸附的数学模型 ,并通过实例计算分析了凝析气混合物在储层多孔介质表面的吸附量及吸附相的组成。结果表明 ,凝析气体混合物在储层孔隙介质中的吸附量随温度的升高而减少 ,随压力的升高而增大 ;同时在同一孔隙介质中 ,当温度压力相同时 ,重组分含量相对较高的凝析气体系 ,其吸附量相应较大。最后得出结论 ,凝析气体混合物在储层多孔介质表面的吸附量的数量级为 1 0 - 2 mol/kg。

Because the porous media have very large specific area, adsorption of fluid of gas condensate reservoir in porous medium are is in reality, so that it will affect the problems of gas reservoir engineering, such as reserves calculation, phase behavior simulation and gas well production calculation etc. On the basis of analyzing the mechanism of porous medium adsorbing gas condensate reservoir fluid and according to the theory of gas solid adsorption, adsorption mathematics model of condensate gas in porous medium has been developed. By case calculating, adsorption amount and the composition of the adsorbed fluid of condensate gas in porous medium have been analyzed. Results show that the adsorption amount decreases with temperature rising, and increases with pressure going up. At the same time, in the same porous medium and under the same temperature and pressure, the system with high heavy component cut has high adsorption amount. Finally, it is concluded that the order of the adsorption amount of reaches 10 2 ?mol/kg and it should be taken into account in the practical engineering.