Field, laboratory, and modeling investigation of the skin effect at wells with slotted casing, Boise Hydrogeophysical Research Site

Barrash, Warren; Clemo, Tom; Fox, J. J.; Johnson, Timothy C.

doi:10.1016/j.jhydrol.2005.10.029

Cited by 70 publications

(77 citation statements)

References 33 publications

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“…Skin layers can also cause significant errors in the analysis of pumping, slug or flowmeter tests, if their head loss is erroneously attributed to the aquifer (van Everdingen 1953;Moench 1984;Yang and Gates 1997;Young 1998;Barrash et al 2006). In layered aquifers, skin layers can induce additional head losses through flow diversion between layers (Barrash et al 2006).…”

Section: Head Losses In the Aquifermentioning

confidence: 99%

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

Houben

2015

Hydrogeol J

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Knowledge about the hydraulics of water wells is important to optimize their energy efficiency. By minimizing head losses around the well, energy consumption and ageing processes can be limited, thereby prolonging the well's service life. The contribution of the individual components to total head loss (drawdown) in the well is analyzed in detail. The single most important contributor to drawdown is commonly the aquifer. Its hydraulic conductivity can only be improved slightly through development. The second most important contributor is the formation of a wellbore skin layer. This occurs if no proper well development was performed after drilling; the layer contains remnants of drilling-fluid additives or mobilized fine aquifer particles. The head loss caused by groundwater flow in the gravel pack, through the screen slots and inside the well, was found to be small. Thus, well development is the most important measure to influence well performance and energy efficiency. For longer operation times and pumped volumes, the energy gains outperform the cost for the development.

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Section: Head Losses In the Aquifermentioning

confidence: 99%

“…In layered aquifers, skin layers can induce additional head losses through flow diversion between layers (Barrash et al 2006). Assuming an even distribution of the filter cake and laminar flow therein, the head loss can be calculated applying the adapted Thiem (1906) Eq.…”

Section: Head Losses In the Aquifermentioning

confidence: 99%

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

Houben

2015

Hydrogeol J

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“…Cooley and Cunningham 1979;Kaleris et al 1995;Von Hofe and Helweg 1998;Rushton 2006;Chenaf and Chapuis 2007), while others relied on commercially available groundwater modeling programs, such as MODFLOW (e.g. Barrash et al 2006;Horn and Harter 2009;Houben and Hauschild 2011;McMillan et al 2014), FEFLOW (Rubbert and Treskatis 2008) and HYDRUS-2D (Yakirevitch et al 2010). There is at least one reactive transport model of flow to wells, based on PHAST (Larroque and Franceschi 2010).…”

Section: Transient Flow To Wellsmentioning

confidence: 99%

述评:水井水力学—水流定律和几何学的影响

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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“…There are, however, differing opinions with regard to the porosity and permeability of typical screened PVC casings. We use a porosity of 4 per cent (Bakulin et al 2008) and a permeability of 1900 D (Barrash et al 2006).…”

Section: Sensitivity Of Stoneley Waves To Formation Permeability Behimentioning

confidence: 99%

A pseudospectral method for the simulation of 3-D ultrasonic and seismic waves in heterogeneous poroelastic borehole environments

Sidler¹,

Carcione²,

Holliger³

2013

Geophysical Journal International

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S U M M A R YWe present a novel approach for the comprehensive, flexible and accurate simulation of poroelastic wave propagation in 3-D cylindrical coordinates. An important application of this method is the realistic modelling of complex seismic wave phenomena in fluid-filled boreholes, which represents a major, as of yet largely unresolved, problem in exploration geophysics. To this end, we consider a numerical mesh consisting of three concentric domains representing the borehole fluid in the centre followed by the mudcake and/or casing, and the surrounding porous formation. The spatial discretization is based on a Chebyshev expansion in the radial direction and Fourier expansions in the vertical and azimuthal directions as well as a Runge-Kutta integration scheme for the time evolution. Trigonometric interpolation and a domain decomposition method based on the method of characteristics are used to match the boundary conditions at the fluid/porous-solid and porous-solid/porous-solid interfaces as well as to reduce the number of gridpoints in the innermost domain for computational efficiency. We apply this novel modelling approach to the particularly challenging scenario of near-surface borehole environments. To this end, we compare 3-D heterogeneous and corresponding rotationally invariant simulations, assess the sensitivity of Stoneley waves to formation permeability in the presence of a casing and evaluate the effects of an excavation damage zone behind a casing on sonic log recordings. Our results indicate that only first arrival times of fast modes are reasonably well described by rotationally invariant approximations of 3-D heterogenous media. We also find that Stoneley waves are indeed remarkably sensitive to the average permeability behind a perforated PVC casing, and that the presence of an excavation damage zone behind a casing tends to dominate the overall signature of recorded seismograms.

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Field, laboratory, and modeling investigation of the skin effect at wells with slotted casing, Boise Hydrogeophysical Research Site

Cited by 70 publications

References 33 publications

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

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

述评:水井水力学—水流定律和几何学的影响

A pseudospectral method for the simulation of 3-D ultrasonic and seismic waves in heterogeneous poroelastic borehole environments

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