朝45区块剩余油分布及挖潜效果预测

Remaining oil distribution of Chao 45 and potential tapping Prediction

分析了朝 45区块的水淹特征 ,得出剩余油主要分布在注采不完善区、构造的边缘地区、厚度较大油层的上部及分布面积小的砂体 ,给出了剩余油的挖潜方法 ,应用数值模拟软件对 2 0 0 4～ 2 0 0 7年的注采比、油水井堵水、水井转油井、井网加密的效果进行了预测 .研究结果表明 :朝 45区块合理注采比为 2 .0 0 0 ;在保持合理注采比的条件下 ,油水井堵水可使含水率下降、地层压力和产量提高 ;水井转油井可使含水率比基础方案的低、地层压力下降和采出程度提高 ;井网加密可使含水率下降 ,且短时间内 ,综合含水率上升缓慢 ,见水后含水率上升较快 ,地层压力基本不变 ,采出程度提高 .

This paper analyzes water flooding characteristics of Chao 45,investigates the distribution rule of remaining oil, shows potential tapping measure of remaining oil, applies the software of numerical modeling forecasted injection-production ration, oil well water plugging, converted oil well from water well, well infilling network from 2004 to 2007. According to forecast conclusion, the remaining oil of Chao 45 mostly distributes at the faultiness tract of injection-production, structure fringe tract, the top of thicker oil formation, sandstone that has little distribution and can't form integrity injection-production well network. Injection-production ratio of Chao 45 is 2 Retaining appropriate injection-production ratio, oil well water plugging can decline water cut and increase formation pressure and output, converting oil well from water well can make the water cut lower than basic rule, formation pressure decline slightly, and oil recovery increased. Well infilling network can lower the water cut, make composite water cut increase slowly in short time, the water cut increase rapidly, formation pressure remain constant and the recovery percent of reserves increase when water breakthrough happens.