均质油藏试井解释模型研究

Study on Well Test Interpretation Model of Homogeneous Reservoir

油气井开发过程中,均质油藏具有一定的特性。为了计算测试井的特性参数,基于渗流力学基本理论,创建了均质油藏试井解释模型,选取Stehfest拉式逆变换数值反演算法,在压力、压力导数图版拟合方法的基础上,获得典型试井分析样板曲线,进而估算出反映储层特征的参数。研制的压力反演解释软件可以通过不同的反演算法获得均质油藏的储层特性参数,如地层渗透率、无因次表皮系数、无因次井筒储集系数等,反演精度可达到90%以上。数值反演过程仍然需要人工参与,拟合点选择不同,反演结果会呈现不同程度的误差。

In the process of oil and gas well development,homogeneous reservoirs have certain characteristics.To calculate the characteristic parameters of test wells,a well-test interpretation model is built for homogeneous reservoirs based on the basic theory of mechanics of fluids in porous media.The numerical inversion algorithm of Stehfest inversion Laplace transform is selected,and a typical well test analysis sample curve is obtained based on the pressure and pressure derivative chart fitting method,and then the parameters reflecting the reservoir characteristics are estimated.The developed pressure inversion interpretation software can obtain the reservoir characteristic parameters of homogeneous reservoirs through different inversion algorithms,such as formation permeability,dimensionless skin coefficient,and dimensionless wellbore storage coefficient,and the inversion accuracy can reach more than 90%.The process of numerical inversion still requires manual participation,and the inversion results will show different degrees of error with different fitting points.