用五点井网生产数据计算相对渗透率的简易算法

SIMPLE CALCULATING ALGORITHM OF THE RELATIVE PERMEABILITIES BY THE PRODUCTION DATA OF FIVE-SPOT WELL PATTERN

当面对五点法井网布井不规则和强非均质性时,在没有取心数据或取心数据不全面的情况下,仅根据生产数据计算相对渗透率的难度很大,为此提出一种利用生产数据近似计算复杂地层条件下相对渗透率的简易算法,并通过五点法井网模型水驱实验及CMG模型拟合来验证相对渗透率计算方法的准确性。结果表明该方法计算的相对渗透率比较接近实际情况,用于数值模拟能提高历史拟合的速度。与其他方法进行对比,具有更加简单的优点。

For a five-spot well pattern, it is very hard to calculate the relative permeabilities only according to the production data in the conditions of no or incomplete cored data when the well pattern is non-uniform and heteroge- neity is rather strong. Usually, a large number of the production data is needed to fit to get the relevant parameters for predicting the relative permeabilities of the reservoirs. A simple method is proposed in this paper to approximate- ly calculate the relative permeabilities with the help of the production data. And then taking the waterflooding test data in the five-spot well pattern model as example, the oil and water relative permeabilities of the cores are compu- ted, and meanwhile integrated with CMG model, the experimental results are fitted to demonstrate the accuracy of the calculating method. The achievements show that the relative permeability curves predicted by the method are more close to the facts, and moreover the application in the numerical simulation can enhance the speed of the his- tory matching. Finally comparing with the other approaches, the method is proven to possess more simple and con- cise advantage in the calculation of the relative permeabilities.