大尺寸模型水驱波及规律对比实验

Comparative experiment of water flooding rule by large-scale model

水驱波及规律的研究是油藏开发的重点。依照油水在电性上的差异,利用电极法测量物理模型水驱过程中油水饱和度场的分布与变化,可直观地了解油水运动规律,掌握驱替动态。采用三维物理模拟实验装置,利用胶结模型考察井网改变对水驱波及规律的影响,发现2个模型在相同驱替条件下得到的水驱规律一致,平均采出程度为50.50%,改变井网后可提高采出程度18.82百分点。对于均质模型,将开发井网由五点法调整为九点法,可有效提高模型波及面积和采出程度,从而提高采收率。应用此类大平板模型进行水驱模拟更接近油藏实际情况,所得到的规律认识可直接应用于均质油藏的实际开发。

Investigation of the rule of water flooding is the key to reservoir development, according to the difference of oil and water in electricity, using electrode method to measure the distribution of oil and water saturation, the motion of oil and water in the model is understood and dynamic displacement is controlled. With advanced three-dimensional physical simulation device and cementation model, the effect of changing pattern of well spacing on flooding rule is investigated, the two models under the same displacement conditions of water flooding are consistent, the average recovery is 50.50%, average oil recovery rises 18.82% after well pattern changes. For the homogeneous model, the development pattern changes from five points to nine points, which can effectively improve flooding area and the degree of displacement. This large physical simulation is very similar to the real reservoir,the results can be directly applied to the development of homogeneous reservoirs in situ.