油藏非均质性对水平井蒸汽吞吐效果的影响

应用洛伦兹曲线计算油藏渗透率变异系数、储层厚度变异系数及孔隙度变异系数，将三者加权得到评价油藏非均质程度的综合指标。结合锦612稠油油藏地质开发特征，建立相同非均质程度不同物性分布规律的油藏模型；通过反解洛伦兹曲线的方法建立不同非均质程度的油藏模型。采用油藏数值模拟方法研究油藏非均质程度对水平井蒸汽吞吐效果的影响。研究结果表明，油藏非均质程度越强，水平井蒸汽吞吐效果越差；相同油藏非均质程度下，油藏物性的分布规律对水平井蒸汽吞吐效果有显著影响。当在水平井沿程方向油藏物性呈单调变化时，水平井的蒸汽吞吐效果最差；当水平井跟端落在前缘薄层砂相带，并依次穿过水下分流河道相带及水下分流间相带时，其蒸汽吞吐效果最好。

Effect of Reservoir Heterogeneity on Cyclic Steam Stimulation Result of Horizontal Well

Applying Lorenz curve to calculate coefficient of variation of reservoir permeability,reservoir thickness and porosity coefficient,the reservoir heterogeneity comprehensive index is obtained by the three weighted evaluation.Combined with geological development of heavy oil characteristics of Jin612 well,the reservoir model of the same non-homogeneous degree and different physical distribution is established.By inverse solution for the Lorenz curve,reservoir model with different degrees of non-homogeneous is established,and using numerical simulation method of the reservoir,the effect on result of cyclic steam stimulation of horizontal well by reservoir heterogeneity is studied.The results show that the stronger is the degree of reservoir heterogeneity,the worse is the effect of horizontal well cyclic steam stimulation.Under the same degree of reservoir heterogeneity,the distribution of reservoir properties has a significant effect on cyclic steam stimulation of the horizontal well.The effect of cyclic steam stimulation of horizontal well is the worst when reservoir properties is monotonically changing in the horizontal direction and the steam stimulation result is the best when the leading edge of horizontal wells falls at thin sand faces,and passing through the underwater distributary channel faces in turn and inter-phase segregation with water.