一种新型预测产液量模型的改进及应用

Improvement and Application of A New Model for Predicting Fluid Production

针对传统的产量递减分析方法大多是一些经验公式,不具备完善的理论基础,而数值模拟方法所需时间较长,为了快速地预测油藏区块的总产液量,在物质平衡和信号处理的理论基础上,介绍了一种新型预测产液量的模型。新型产液量模型建立在油藏区块是完全封闭的理想情况下,认为其区块的连通系数fij为1,其预测产液量高于实际产液量。针对上述情况,考虑到实际油田区块的非均质性以及其他一些地质和注水方案因素,或者油藏是不封闭的,有流体流出油藏区块,都有可能导致fij不为1。因此,有必要对原新型模型进行改进,并用实际油田数据验证改进模型。结果表明,原新型模型高估了实际产液量数据;而改进的产液量模型能够更好地进行历史拟合,其连通系数是介于0和1之间的一个参数。

In view of the most of production decline analytical approaches being empirical formulae without theoretical basis,too much time was used to match the history production data in numerical simulation.In order to predict the liquid production of reservoir quickly,a liquid production model was presented based on material balance and signal processing.A new fluid production predicting model was built on the condition of closed reservoirs,it took the connection coefficient fij as 1,but the predicted fluid production was higher than the actual one.In allusion to the heterogeneity and the other factors of geology and water injection schemes or the reservoir being not closed with fluid flowing out from the reservoir,it was possible that fij was not 1.Therefore it was necessary to improve the original model and modify it with production data.The result indicates that the high fluid production is predicted with the original model,while the modified model can be used to well match the production history with connection coefficient between 0 and 1.