海相砂岩底水稠油油藏水锥形态物理模拟研究

Physical Experiment on Water Cone Shape in Marine Sandstone Bottom Water Heavy Oil Reservoir

针对P油田底水稠油油藏波及规律影响因素开展研究,利用二维物理模型和三维物理模型,采用预埋电极方式,得到不同因素影响下的水脊变化规律和波及规律。实验表明,海相砂岩底水稠油油藏水平井开发时底水锥形突进,含水上升规律呈“厂”字形,且含水曲线会因隔夹层呈阶梯状上升,而波及系数与流度、驱替速度和隔夹层因素呈正相关关系;在三维物理模型的实验条件下,隔夹层能让波及系数提高18%。因此,P油田下步挖潜策略应在流度高且油藏上部存在隔夹层的区域布井挖潜,开发时采用高采油速度开发。

Based on 2D physical model and 3D physical model with the method of embedded electrode,this paper studies the water cut variation and sweep law of marine sandstone bottom water heavy oil reservoir under the influence of different factors.The results show that the bottom water cones in horizontal well development of marine sandstone bottom water heavy oil reservoir.The law of water cut rising shows a“厂”shape,and the water cut curve rises in a stepwise manner because of interlayer.Sweep efficiency is positively correlated with mobility,displacement velocity and interlayer factors.The closer the interlayer is to the upper part,the greater the sweep efficiency is.The three-dimensional physical model shows that the sweep coefficient is increased by 18%under the experimental conditions.Therefore,the next potential tapping strategy of P oilfield should be in the area with high fluidity and interlayer developed in the upper part of the reservoir.Oil field should develop with high oil recovery rate.