Abstract: Demonstrates how to identify the comprehensive physical parameters of geology and fluids by means of backward algorithm. It can fit the pressure field under given well productionor injection rates. So the pressure within the infill and adjusting wells can be calculated neednot to know physical parameters of geology and fluids macroscopically in forward algorithm.Meanwhile,it can include the effect of some special cases on pressure field,such as reservoirdamage and fauIted formation etc. of the nearby wellsite. Oilfield test indicate that thismethod has a high accuraey and the relative error between predicted ones and field measure-ment is less than 10%.

Key words: infiliing well, formation pressure prediction, mathematical model, finite element method, match, computation

摘要： 用反算法识别地质和流体的综合物理参数,在给定井点产量或注水量和井底压力条件下,对压力场进行拟合,以求得加密井位或调整井位的层中压力.避免用正算法必须给定地质和流体的各种物理参数,而且宏观地包含了类似井点附近的油层污染、断层等特殊情况对压力场的作用.结果表明,拟合的精度高,与实测数据比较误差小于10%.

关键词: 加密井, 地层压力预测, 数学模型, 有限元法, 拟合, 计算