Identification of aquifer and well parameters from step-drawdown tests

Avcı, Cem B.; Çiftçi, Emin; Şahin, Abdurrahman

doi:10.1007/s10040-010-0620-2

Cited by 16 publications

(8 citation statements)

References 35 publications

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“…Well performance can be evaluated using the well efficiency before and after surging. Many methods for the evaluation of well efficiency have been developed and reported in the literature [19][20][21][22][23][24][25][26][27], but in this study, well efficiency was evaluated using Jacob's [22] and Rorabaugh's model [26]. Well efficiency is the ratio between the theoretical drawdown of the aquifer to the actual drawdown of the well [16,17].…”

Section: Step Drawdown Test and Interpretationmentioning

confidence: 99%

Evaluation of Well Improvement and Water Quality Change before and after Air Surging in Bedrock Aquifers

Lee

et al. 2022

Water

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When a drought occurs, drought response is mainly focused on the development of new wells. However, it is inefficient to respond to droughts by developing additional new wells in areas where many existing groundwater wells have been developed. Rather, it is necessary to find a way to use the existing wells efficiently and, if possible, increase the amount of groundwater that can be pumped. In this study, a pumping test and analysis method were used to evaluate the effect of air surging on improving existing wells. Drawdowns were reduced in the test wells, and, accordingly, the average specific discharges and transmissivities were increased. Since many factors in bedrock aquifers must be considered in order to calculate the well efficiency for the evaluation of the well performance, it seems better to compare the pumping rate and drawdown based on a reference time calculated by an adjusted time. Such factors could be the uncertainty of the aquifer model, aquifer inhomogeneity, and a hydrogeologic boundary. Additionally, in this process, the changes in groundwater quality were investigated, as well as the substances that caused the degradation of the well performance in bedrock aquifers. According to the results of the groundwater quality analysis conducted during the surging process and the step drawdown tests, there was no significant groundwater quality change before and after surging, but it appeared that there was an inflow of contaminants from the upper shallow strata close to the surface. According to the results of the XRD, XRF, and SEM-EDS analyses for the substances collected during surging and the substances deposited inside the well pipe, most of the substances were Fe-related amorphous components. Additionally, Fe coexisted with components such as As, V, and Zn, which formed the well casing together with Fe and were eluted in the surging process and step drawdown tests.

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Section: Step Drawdown Test and Interpretationmentioning

confidence: 99%

Evaluation of Well Improvement and Water Quality Change before and after Air Surging in Bedrock Aquifers

Lee

et al. 2022

Water

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“…This means that the equality of function limits will be satisfied. Equations (23) and (24) provide knowledge about the possibility of the following relationship:…”

Section: Full Compensation Of Well Ageingmentioning

confidence: 99%

“…The method is based on taking the derivative of the drawdown with respect to time for the entire pumping test period, eliminating the constant well-loss terms. The conducted tests showed that the method allows the generation of the aquifer function B(t) for the entire duration of the step-drawdown test [24]. The choice of the model is the most difficult choice that the analyst of such a hydraulic test has to make since a wrong model can only lead to the wrong conclusions and failure of the borehole [25].…”

Section: Introductionmentioning

confidence: 99%

The Dynamics of Water Wells Efficiency Reduction and Ageing Process Compensation

Polak

Górecki²,

Kaznowska-Opala

2019

Water

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Water wells play an increasingly important role in providing water for the civilian population all over the world. Like other engineering structures, wells are subject to ageing processes resulting in degradation, which is observed as a reduction in hydraulic efficiency throughout their lifespan. To date, it has been found that the ageing process of a well is determined by a number of factors. The mathematical description of this process can be simplified. Drawing on Jacob’s equation, this paper presents the course of the degradation process as a variable depending on operation time, well loss and flow rate. To apply the determined relationships in practice, simplifying assumptions were adopted, which make it possible to determine the moment of ageing compensations of the degradation processes. It was also demonstrated that the degradation process may be slowed down by the appropriate selection of initial operating parameters. The presented discussion highlights the significance of parameters α, δ and exponent β. The relation between hydraulic resistances in an aquifer and in the engineering structure is closely connected with these values. The presented arguments indicate that step drawdown tests provide the necessary information which allows tracking changes in the ageing processes occurring in the engineering structure. The analysis of the drawdown test results makes it possible to determine the moment when the necessary adjustments in the operating parameters of a water well should be performed. Eventually, it allows maintaining the high hydraulic efficiency of the intake and extending the lifespan of the well in accordance with the principle of sustainability.

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“…El caudal de extracción es entonces incrementado hasta que un nuevo estado cuasi-estacionario es alcanzado y el procedimiento se repite para caudales adicionales. Estas pruebas de caudal escalonado (step-drawdown tests), también conocidas como aforos, permiten estimar los parámetros K y S s del acuífero y, además, evaluar las pérdidas de carga no lineales que son necesarias para la selección del caudal de operación del pozo (Rorabaugh, 1953;Avci, 1992;Kruseman y De Rider, 1994;Kawecki, 1995;Batu, 1998;Jha et al, 2006;Shekhar, 2006;Louwyck et al, 2010;Mathias y Todman, 2010;Avci et al, 2010).…”

Section: Métodosunclassified

Estimación de parámetros mediante inversión y análisis de las pérdidas hidráulicas lineales y no-lineales durante el desarrollo y aforo del pozo San Lorenzo Tezonco

Morales-Casique¹,

Escolero²,

Arce³

2015

BSGM

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Estimación de parámetros durante el aforo del pozo SLT 203 ResumenSe presenta un análisis de las pruebas de bombeo escalonadas en el pozo San Lorenzo Tezonco (SLT) localizado en la Ciudad de México y que alcanzó 2008 m de profundidad. Los parámetros hidrogeológicos y los parámetros correspondientes a las pérdidas de carga hidráulica debidas al pozo son estimados mediante inversión. Los resultados de las pruebas ilustran claramente el efecto del desarrollo mediante el bombeo donde la eficiencia del pozo se incrementa durante el desarrollo y durante las pruebas de aforo posteriores. Por otra parte, los valores de conductividad hidráulica y almacenamiento específico obtenidos en este trabajo son los primeros valores reportados en la literatura para la Cuenca de México correspondientes a las formaciones profundas entre 1176 y 2008 m de profundidad y que son representativos de una escala de cientos de metros. Estos valores pueden ser utilizados como parámetros iniciales en la calibración de modelos regionales de flujo de agua subterránea en la Cuenca de México. Adicionalmente, los parámetros del acuífero y del pozo SLT proporcionan valores de referencia útiles para planear aforos y el diseño constructivo de pozos de condiciones similares.Palabras clave: Ciudad de México, hidrogeología, formaciones profundas, eficiencia hidráulica, estimación de parámetros, prueba de bombeo escalonada. Abstract We present an analysis of step-drawdown tests conducted at the San Lorenzo Tezonco (SLT) deep well located in Mexico City that reached a depth of 2008 m. The hydrogeologic and well parameters are estimated through inversion. The results of the tests illustrate clearly the effect of well development through pumping, where the well efficiency increases during well-development and through

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Identification of aquifer and well parameters from step-drawdown tests

Cited by 16 publications

References 35 publications

Evaluation of Well Improvement and Water Quality Change before and after Air Surging in Bedrock Aquifers

Evaluation of Well Improvement and Water Quality Change before and after Air Surging in Bedrock Aquifers

The Dynamics of Water Wells Efficiency Reduction and Ageing Process Compensation

Estimación de parámetros mediante inversión y análisis de las pérdidas hidráulicas lineales y no-lineales durante el desarrollo y aforo del pozo San Lorenzo Tezonco

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