Review: Hydraulics of water wells—head losses of individual components

Houben, Georg

doi:10.1007/s10040-015-1313-7

Cited by 40 publications

(32 citation statements)

References 38 publications

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“…aquifer thickness, hydraulic conductivity, radius of the cone of depression, (natural) water level fluctuations and porosity. A paper related to this study (Houben 2015) shows the practical application of the analytical models discussed here for well design and investigates the relative contributions of individual well components to total head loss and how they may be improved. bulk density of aquifer material (M/L 3 ) τ tortuosity ф porosity ф e effective porosity ϑ angle between flow direction and gravitation ϕ 0 grain geometry factor Constants g 9.81 m/s 2 ρ ρ w =1,000 kg/m 3 μ 0.001 kg/s·m ν 1.01·10 −6 m 2 /s…”

Section: Discussionmentioning

confidence: 98%

“…Weisbach 1845; Smreker 1878Smreker , 1914Forchheimer 1901a, b;Thiem 1906;Sichardt 1928;Kozeny 1933;Nahrgang 1954Nahrgang , 1965Heinrich 1964;Klotz 1971) and is, thus, often ignored or sometimes even cited or interpreted incorrectly. In a paper related to this study (Houben 2015), the practical consequences of well hydraulics for well design are discussed in detail for all of the individual well components.…”

Section: Introductionmentioning

confidence: 99%

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Review: Hydraulics of water wells—flow laws and influence of geometry

Houben

2015

Hydrogeol J

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Water wells are an indispensable tool for groundwater extraction. The analytical and empirical approaches available to describe the flow of groundwater towards a well are summarized. Such flow involves a strong velocity increase, especially close to the well. The linear laminar Darcy approach is, therefore, not fully applicable in well hydraulics, as inertial and turbulent flow components occur close to and inside the well, respectively. For common well set-ups and hydraulic parameters, flow in the aquifer is linear laminar, non-linear laminar in the gravel pack, and turbulent in the screen and the well interior. The most commonly used parameter of well design is the entrance velocity. There is, however, considerable debate about which value from the literature should be used. The easiest way to control entrance velocity involves the well geometry. The influence of the diameter of the screen and borehole is smaller than that of the screen length. Minimizing partial penetration can help to curb head losses.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Review: Hydraulics of water wells—flow laws and influence of geometry

Houben

2015

Hydrogeol J

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“…The well skin is usually developed outside the wellbore because of the well construction (Novakowski 1989;Park and Zhan 2002;Chang and Chen 2002;Yeh and Yang 2006;Yeh and Chang 2013;Houben 2015b). In general, the well skin can be classified into two types, the infinitesimal skin and finite thickness skin.…”

Section: Introductionmentioning

confidence: 99%

Non-Darcian flow to a partially penetrating well in a confined aquifer with a finite-thickness skin

Feng

Wen

2016

Hydrogeol J

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Non-Darcian flow to a partially penetrating well in a confined aquifer with a finite-thickness skin was investigated. The Izbash equation is used to describe the non-Darcian flow in the horizontal direction, and the vertical flow is described as Darcian. The solution for the newly developed nonDarcian flow model can be obtained by applying the linearization procedure in conjunction with the Laplace transform and the finite Fourier cosine transform. The flow model combines the effects of the non-Darcian flow, partial penetration of the well, and the finite thickness of the well skin. The results show that the depression cone spread is larger for the Darcian flow than for the non-Darcian flow. The drawdowns within the skin zone for a fully penetrating well are smaller than those for the partially penetrating well. The skin type and skin thickness have great impact on the drawdown in the skin zone, while they have little influence on drawdown in the formation zone. The sensitivity analysis indicates that the drawdown in the formation zone is sensitive to the power index (n), the length of well screen (w), the apparent radial hydraulic conductivity of the formation zone (K r2 ), and the specific storage of the formation zone (S s2 ) at early times, and it is very sensitive to the parameters n, w and K r2 at late times, especially to n, while it is not sensitive to the skin thickness (r s ).

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“…Despite its minute thickness, wellbore skin can significantly increase head losses since its hydraulic conductivity is often considerably lower than that of the aquifer and the gravel pack. The drawdown it causes can be one of the largest contributors to total well loss (Houben ).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Wellbore Skin Samples—Typology, Composition, and Hydraulic Properties

Houben¹,

Halisch

Kaufhold

et al. 2016

Groundwater

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The presence of a wellbore skin layer, formed during the drilling process, is a major impediment for the energy-efficient use of water wells. Many models exist that predict its potential impacts on well hydraulics, but so far its relevant hydraulic parameters were only estimates or, at best, model results. Here, we present data on the typology, thickness, composition, and hydraulic properties obtained from the sampling of excavated dewatering wells in lignite surface mines and from inclined core drilling into the annulus of an abandoned water well. Despite the limited number of samples, several types of skin were identified. Both surface cake filtration and particle straining in the aquifer occur. The presence of microcracks may be a determining feature for the hydraulic conductivity of skin layers. In the case of the well-developed water supply well, no skin layer was detected. The observed types and properties of wellbore skin samples can be used to test the many mathematical skin models.

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Review: Hydraulics of water wells—head losses of individual components

Cited by 40 publications

References 38 publications

Review: Hydraulics of water wells—flow laws and influence of geometry

Review: Hydraulics of water wells—flow laws and influence of geometry

Non-Darcian flow to a partially penetrating well in a confined aquifer with a finite-thickness skin

Analysis of Wellbore Skin Samples—Typology, Composition, and Hydraulic Properties

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