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Effects of Well Parameters Analysis Techniques on Evaluation of Well Efficiency in Step-Drawdown Test  

Chung, Sang-Yong (Department of Environmental Geosciences, Pukyong National University)
Kim, Byung-Woo (K-water Institute, Korea Water Resources Corporation)
Kim, Gyoo-Bum (K-water Institute, Korea Water Resources Corporation)
Kweon, Hae-Woo (Domestic Exploration Support Team, Korea Resources Corporation)
Publication Information
The Journal of Engineering Geology / v.19, no.1, 2009 , pp. 71-79 More about this Journal
Abstract
Step-drawdown tests were conducted at four pumping Wells, two in porous media and two in fractured rocks, respectively. In general, P = 2.0 suggested by Jacob (1947) is applied to porous media and fractured rocks in terms of drawdowns of step-drawdown test. In an attempt to review problems of linear model (Jacob's graphic method) in interpreting the step-draw down test, the outcomes of well parameters (aquifer loss coefficient (B), well loss coefficient (C) and well loss exponent (P)) calculated from linear and nonlinear model (Labadie and Helweg's least-squares method) were compared and analyzed. The values of C and P calculated from linear and nonlinear models differed according to permeability of aquifer and the conditions of pumping well. The value C obtained from nonlinear models in porous media and fractured rocks is about $10^0{\sim}10^{-2}$ and $10^{-3}{\sim}10^{-6}$ times lower than in their linear models, respectively. The value P of porous media obtained from nonlinear model ranged from 2.123 to 2.775, while it ranged from 3.459 to 5.635 for fractured rocks. In case of nonlinear model, well loss highly depends on the value P. At this time, well efficiencies calculated from linear and nonlinear models were $1.56{\sim}14.89%$ for porous media and $8.73{\sim}24.71%$ for fractured rocks, showing a significant error according to chosen models. In nonlinear model, it was found that the regression analysis using the least squares method was very useful to interpret step-drawdown test in all aquifer.
Keywords
step-drawdown test; well loss; well efficiency; least-squares method; nonlinear model;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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