基于油藏井间动态连通性评价化学驱油效果

应用信号处理方法建立了油藏井间动态连通性反演模型,并基于遗传算法和最小二乘法给出了反演模型的自动求解方法.利用该模型对化学驱油前后单元井组内井间连通系数进行求解,同时基于变异系数法对连通系数离散程度的变化进行分析,建立了一种新的化学驱油效果评价方法.该方法仅需注采量动态数据,易于操作,简便直观.对典型概念模型和孤东油田二元复合驱矿场实例对比分析表明,该方法可有效预测化学驱后注入井的水流方向改变情况,直观有效地反映化学驱油效果,从而验证了新方法的适用性和有效性.

Effect evaluation of chemical flooding based on inter-well dynamic connectivity for reservoir

A novel model of inter-well dynamic connectivity for reservoir is eslahlished by signal proeessing, which can he solved atltnmatically hy genetic algorithm and the least square method. By solving this model, the inter-well connectivity coefficient of well group unit before and alter chemical floodiug can be ohtained. Using the variation coefficient method to analyze the discrete degree variability of connectivity coefficient, a new method to evaluate the displacement effect of chemical flooding is proposed. The injection and production data is essential for the method. Meanwhile. it is maneuverable, cheap anti simple. The new method can effectively predict the water changing direction of injection well after chemical flooding anti reflect the displacement effect of chemical flooding intuitively by comparing with the result of a typical synthetic rondel and polymer-surfactant flooding case of Gudong Oilfield.