考虑拟流度比的蒸汽驱前缘预测模型研究

Van Lookeren研究了拟流度比为0时的蒸汽驱前缘预测模型，提出形状因子取得最大值时的注汽参数为最优参数。而在实际油藏中，由于地层中原油黏度较大，或注汽速率较小，拟流度比往往较大，此时利用最大形状因子优化注汽参数受到限制。针对该情形，应用数学方法研究了拟流度比不为0时的蒸汽驱前缘预测模型。绘制了形状因子、拟流度比、注汽速率与前缘形状关系图版，发现增大注汽速率，可增大形状因子，从而减小拟流度比，减轻蒸汽超覆程度，提高前缘驱的波及效率。由于注汽速率受注汽压力限制，研究了注汽速率与注汽压力的协调关系，利用该关系和研究的前缘模型，对前人的注汽参数优化方法进行了改进。

THE STUDY ON STEAM FLOODING FRONTIER PREDICTION MODEL CONSIDERING PSEUDO MOBILITY RATIO

Van Lookeren studied the steam flooding frontier prediction model when the pseudo mobility ratio was zero，and proposed the steam injection parameters were optimal，while the shape factor got its maximum value.But in actual reservoirs ，the pseudo mobility ratio was usually not zero but greater because of higher oil viscosity or lower injection rate.In this case，the optimal method of steam injection parameters was limited.In this paper，the steam flooding frontier prediction model considering pseudo mobility ratio is studied，the charts among shape factor，pseudo mobility ratio and steam injection rate are drawn.It can be concluded from the charts that increasing steam injection rate can increase shape factor，so as to decrease the pseudo mobility ratio，reduce steam override and increase sweep efficiency.For steam injection rate was limited by pressure，the correlation among them was studied.Through the correlation and frontier model，the optimal method of steam injection parameters was modified.