考虑供给边界和摩阻损失的水平井产能计算方法研究

Method for Calculation of Horizontal Wells Considering Supply Boundaries and Friction Loss

常用的水平井产能计算公式如Joshi公式、Renard&Dupuy公式等在推导时没有考虑油层供给边界和井筒摩阻损失的影响,因此在优化水平段长度、计算产能时误差较大。通过将水平井近似处理,采用镜像反映法推导出考虑油层供给边界和井筒摩阻损失影响的水平井产能计算公式。研究表明,采用改进公式可以优化水平段长度且计算的产能结果准确可靠。

The productivity calculation of horizontal wells commonly uses formula such as Joshi,Renard and Dupuy without considering the effects of oil supply boundary and wellbore friction loss in the derivation,induce big error in the optimal horizontal section length calculation.Approximation is used to deal with the horizontal well,and new formulae are deduced for calculating the productivity of horizontal wells,the permeability anisotropy coefficient and friction of the wellbore are introduced.The formula optimization of the horizontal section length and capacity calculation are used and the result is accurate and reliable.