层内纵向非均质性对稠油油藏剩余油分布的影响研究

渤海某油田层内纵向非均质性严重,导致低渗透层动用程度低,影响油藏的高效开发。根据非均质油藏地质特征,利用人造物理模型制作技术制作二维物理模型,进行水驱油实验,从而明确纵向非均质性对剩余油分布规律的影响。实验表明:水驱采收率的高低主要取决于层内纵向非均质性,平均渗透率对它影响相对较小;相同级差、不同渗透率条件下,无水采收率和水驱采收率都随着渗透率的增加而增加,但增幅不明显;相同平均渗透率、不同级差条件下,无水采收率和水驱采收率都随着级差的增大而减少,变化幅度明显。

THE VERTICAL HETEROGENEITY AFFECTING OF RESIDUAL OIL DISTRIBUTION IN HEAVY OIL RESERVOIR

A Bohai oil layer in vertical heterogeneity is serious, resulting in low permeability reservoir producing degree low, affecting the efficient development of reservoir. According to the geological characteristics of heterogeneous reservoir,we make two-dimensional physical model using artificial physical model technology. We do experiments of water flooding, so as to clear the longitudinal heterogeneity influence on residual oil distribution law. Experimental results show: high and low water flooding recovery depends mainly onlayer vertical heterogeneity,and the average permeability has relatively small impact on it; The same differential, different permeability conditions, anhydrous recovery and water flooding recovery are increased with the increase of permeability of the recovery, but the increase was not obvious; The same average permeability, different differential conditions, anhydrous recoveryand water flooding are decreased with the increase of differential recovery, change significantly.