为进一步认识海上陆相砂岩底水油藏开发中后期水驱油规律,指导剩余油挖潜工作,以渤海Q油田为例,以室内长岩心水驱油实验获取的相渗数据为依据,利用建立的高精度底水油藏理论模型,对水平井提高产液量开采的增油效果进行了数值模拟研究。研究结果表明，增大生产压差、提高产液量,可较大幅度地提高驱油效率,同时有利于扩大水驱波及范围。过路井获取的实钻资料与模型计算结果基本吻合表明研究成果符合实际。结合Q油田2口大液量开采试验井近10 a的生产动态数据,建立了底水油藏驱替指标预测经验公式。研究成果成功指导了5口低油柱水平井提液矿场试验,实施后平均单井日増油50 m3,有效期超过3 a,水驱曲线法预测采收率提高了20%。

In order to further understand the law of water flooding in the middle and late period of the development of offshore continental sandstone reservoir with bottom water and guide the exploration of remaining oil potential,with Bohai Oilfield Q taken as an example, a numerical simulation study was carried out on the oil-increasing effect of horizontal well to increase the production of liquid based on the established high-precision theoretical model of bottom water reservoirin accordance withthe data of phase permeability obtained from the indoor long core water flooding experiment.The results show that increasing the production pressure difference and the liquid production can greatly improve the oil displacement efficiency,and help expand the sweep scope as well.The actual drilling data obtained from the pass-through well are in good agreement with the calculated results of the model.At the same time, the empirical formula for predicting displacement index of bottom water reservoir is established based on the production performance data of two large liquid production test wells in Oilfield Q in the past decade.The results have successfully guided the extraction field test of five horizontal wells with low oil column.After the implementation, the average daily oil production per well is increased by 50 m3, with the validity duration over three years.The predicted recovery rate is increased by 20% by water flooding curve method.