A Regression Analysis Approach To Van Everdingen-Hurst Dimensionless Water Influx Variables For Infinite And Finite Aquifers

Abstract

Until now, water influx calculations have relied on accurate values of the van Everdingen-Hurst W_eD dimensionless variables. For programming and hand calculators, equations are needed to determine W_eD. The previous model provides equations for W_eD calculations for the infinite aquifer case. This paper presents two sets of regression equations that are simple to apply to obtain accurate values of W_eD either the infinite or finite aquifer case. The proposed equations have good agreement with the van Everdingen-Hurst method with an average difference of 0.77% and 1.18% for the cases of infinite aquifer and finite aquifer, respectively.