三元复合驱波及系数和驱油效率的实验研究

为了搞清三元复合体系提高采收率的机理,通过室内三维物理模拟驱油实验研究了非均质砂岩油田三元复合驱油过程中波及系数与驱油效率的变化特征,量化三元复合驱不同类型储层驱油效率和波及系数对提高采收率的贡献程度.结果表明,在有隔层的条件下,中渗透层贡献程度达到了25.29%,其次是低渗透层,贡献率为44.31%,而高渗透层仅为30.40%;分析认为,三元复合驱的主要作用在于提高驱油效率,而且主要是提高高渗透层的驱油效率,同时能够提高中低渗透层的波及系数.初步得出驱油效率对提高采收率值的贡献率为33.27%,波及系数的贡献率为66.73%.

Experimental research on sweep efficiency and displacement efficiency of ASP flooding

In order to understand mechanism of ASP flooding, the dynamic characteristics of sweep efficiency and displacement efficiency in ASP flooding process is studied through three-dimensional physical simulation, and contribution degree of displacement efficiency and sweep efficiency of different reservoirs in ASP flooding to enhancing oil recovery is also given quantitatively. Results show that, with barrier existing, the contribution of medium permeable reservoirs is up to 25. 29%, secondly, contribution of low permeable reservoirs is up to 44. 31%, and contribution of high permeable reservoirs is up to 30. 40%. Analysis shows that the key role of ASP flooding is dominant on improving sweep efficiency, especially for that of high permeable layer, and can increase sweep efficiency of low and medium permeable layer. Contribution generated from displacement oil to enhance oil recovery is obtained, which is 33.27%, and sweep efficiency contribution is 66. 73%.