Solution for Flow Rates across the Wellbore in a Two-Zone Confined Aquifer
Publication: Journal of Hydraulic Engineering
Volume 128, Issue 2
Abstract
A closed-form solution for transient flow rates across the wellbore in a confined aquifer is derived from a two-zone radial ground-water flow equation subject to the boundary condition of keeping a constant head at the well radius. An aquifer may be considered as a two-zone system if the formation properties near the wellbore are significantly changed due to the well construction and/or well development. An efficient numerical approach is used to evaluate this newly derived solution. Values of the transient flow rate are provided in a tabular form and compared with those obtained by numerical inversion for the Laplace-domain solution. The results show that the two solutions are in good agreement. This newly derived solution can be used not only for predicting the transient flow rate across the wellbore but also for identifying the effects of a skin with a finite thickness on the estimation of transient flow rates in a ground-water system with two different formation properties.
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Information
Published In
Journal of Hydraulic Engineering
Volume 128 • Issue 2 • February 2002
Pages: 175 - 183
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Aug 18, 2000
Accepted: Jul 25, 2001
Published online: Feb 1, 2002
Published in print: Feb 2002
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