Direct calculation of aquifer parameters in slug test analysis

1984 ◽  
pp. 222-239 ◽  
Author(s):  
V. Nguyen ◽  
G. F. Pinder
Keyword(s):  
Direct Calculation ◽  
Test Analysis ◽  
Slug Test ◽  
Aquifer Parameters

scholarly journals Simple methods for quick determination of aquifer parameters using slug tests

2016 ◽  
Vol 48 (2) ◽  
pp. 326-339 ◽  
Author(s):  
A. Ufuk Şahin
Keyword(s):  
Field Data ◽  
Random Noise ◽  
Time Shift ◽  
Real Field ◽  
Hydraulic Parameters ◽  
Arc Length ◽  
Slug Test ◽  
Slug Tests ◽  
Aquifer Parameters ◽  
Heterogeneous Rock

The slug test is still one of the simplest and cost-effective methods to interpret the hydraulic parameters for aquifer analysis. This study introduces two new estimation approaches for the slug test, the time shift method (TSM) and arc-length matching method (AMM), to identify aquifer parameters in a reliable and accurate manner, which was established on the idea that any change in the normalized drawdown or arc-length measurements of the data curve at the predefined drawdown levels is linked with the variation of storativity. These approaches remove the need for superimposition of the type curves and the field data. The proposed methods are straightforward to apply and automatize the parameter estimation process. TSM and AMM were tested with a number of numerical experiments including synthetically generated data augmented with random noise, hypothetical slug tests conducted in a heterogeneous rock-fracture system, and well-known real field data. The skin effect was also implemented to evaluate its impact on the estimation performance of the suggested approaches. The results verified that both proposed methods are able to produce estimates of hydraulic parameters more accurately than existing methods. The proposed methods could serve as a viable supplementary interpretation tool for slug test analysis.

scholarly journals Hydrogeological analysis of slug tests in glacier boreholes

2005 ◽  
Vol 51 (173) ◽  
pp. 269-280 ◽  
Author(s):  
Bernd Kulessa ◽  
Bryn Hubbard ◽  
Mike Williamson ◽  
Giles H. Brown
Keyword(s):  
Test Data ◽  
Hydraulic Properties ◽  
Silty Sand ◽  
Sensitivity Analyses ◽  
Unconsolidated Sediments ◽  
Test Analysis ◽  
Slug Test ◽  
Fitting Procedures ◽  
Zone Of Influence ◽  
Linear Effects

AbstractSlug testing allows estimation of subglacial hydraulic properties by evaluating the response of a coupled borehole–subglacial flow system to an artificial displacement of its steady-state hydraulic head. However, existing models developed specifically for application to slug-test data collected in glacier boreholes are challenging to apply in practice. Here, we demonstrate that conventional linear methods, which are relatively readily applicable and widely used in groundwater studies, can also be used to estimate subglacial hydraulic properties. Overdamped, underdamped and critically damped slug-test data were recorded in fluctuating boreholes drilled to the bed of Haut Glacier d’Arolla, Valais, Switzerland. We find that non-linear effects in the data are negligible, supporting the application of conventional hydrogeological methods. Results suggest that the hydraulic conductivity of the unconsolidated sediments within the area influenced by a major subglacial drainage channel is enhanced (several 10–2 m s–1; typical of gravelly sand) compared to areas outside the zone of influence (~0.1 × 10–2ms–1; typical of silty sand). A distance to a flow boundary within the subglacial aquifer, inferred on the basis of slug-test analysis, was found to coincide with the actual location of the subglacial channel. Sensitivity analyses reveal that uncertainties in borehole and filter radii, as well as the storage coefficient of the subglacial aquifer, are more likely to affect the accuracy of the hydraulic and distance estimates than uncertainties regarding the repeatability of the slug-test responses and curve-fitting procedures involved in the conventional hydrogeological methods.

scholarly journals Consideration of Bentonite Cake Existing on Vertical Cutoff Wall in Slug Test Analysis

2013 ◽  
Vol 29 (6) ◽  
pp. 5-17
Author(s):  
Jeehee Lim ◽  
The-Bao Nguyen ◽  
Dongseop Lee ◽  
Jaeyoon Ahn ◽  
Hangseok Choi
Keyword(s):  
Cutoff Wall ◽  
Test Analysis ◽  
Slug Test

Hydrodynamic Response — or Slug Tests as a Means to Monitor the Progress of Well Development

1975 ◽  
Vol 12 (1) ◽  
pp. 1-12 ◽  
Author(s):  
J. A. Vonhof
Keyword(s):  
Development Process ◽  
Water Levels ◽  
Clear Water ◽  
Easy Method ◽  
Test Analysis ◽  
Slug Test ◽  
Slug Tests ◽  
Sand Aquifer ◽  
Hydrodynamic Response ◽  
Well Development

Sequential hydrodynamic response—or slug tests in a well during well development—provide an easy method for objective measurement of well development and comparison of the various development techniques that may be employed. Slug-test equipment developed in Saskatchewan permits precise continuous recording of changing water levels for all times except the first few seconds after the introduction of the slug into the well. Three examples of slug-test analysis indicate jetting and air development to be the most successful techniques for well development in a sand aquifer in southeastern Saskatchewan; mechanical surging, on the other hand, actually reversed the development process in the aquifer. The substitution of a bentonite mud for clear water in drilling out the completion zone in one well proved to be highly undesirable because considerably more effort and time were required to develop this well.

An Evaluation of the Bouwer and Rice Method of Slug Test Analysis

1995 ◽  
Vol 31 (5) ◽  
pp. 1239-1246 ◽  
Author(s):  
David L. Brown ◽  
T. N. Narasimhan ◽  
Z. Demir
Keyword(s):  
Test Analysis ◽  
Slug Test
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