曲线自动拟合法在多井试井分析中的应用

Automated Type—Curve Matching for Multiple Well Testing Analysis

本文从渗流方程的反问题出发,提出一种用于多井试井解释的通用方法——曲线自动拟合法。该方法通过一个非线性最小二乘参数估计,使实测数据与油藏数学模型的理论曲线自动拟合。为了判断各井之间地层明显异性的情况,文中提出了一种新的多井试井方法(即多井激动、一井观察试井法),并研制了相应的多井试井软件。矿场实测和虚拟测试的分析结果表明,这种新方法既可以一次性地解释同一油藏中各激动井与观测井之间的不同渗透率,又节省了测试时间和少用了测试仪器。

In this paper, an automatic interpretation method used for multiple well testing is presented, based on the basic theory of well testing interpretation—the inverse problem in flow equation of fluids flowing in a reservoir. This method can enable the data in practice to correspond with the theoretical curve of reservoir mathematic model using least-squares estimation of nonlinear parameters. In order to observe the anisotropy of formations, a new method is offered for testing multiple wells activated with one well observed and an interpretation software is developed. The results from both field tests and mathematical model experiments have proved that this method is capable of interpreting the anisotropy of permeabilities from the observed well to each individual activated well, but also of saving a lot of time and labor for well testing.