Industry survey for horizontal wells. Final report

Wilson, Dan; Kaback, D.S.; Denhan, M.E.; Watkins, D.R.

doi:10.2172/10108808

Cited by 5 publications

(3 citation statements)

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“…If installed in a coastal aquifer, a horizontal well could reduce salt water coning for a given production rate, which subsequently reduces the potential of seawater intrusion [ Sawyer and Lieuallen‐Dulama , ]. A horizontal well with a long screen length can initially mobilize a larger volume of groundwater and contaminants during aquifer remediation process [ Cleveland , ; Wilson and Kaback , ; Zuurbier et al ., ]. However, the cost of drilling a horizontal well is usually more than that of drilling a vertical well for the same length of well screen.…”

Section: Introductionmentioning

confidence: 99%

Intrawellbore kinematic and frictional losses in a horizontal well in a bounded confined aquifer

Wang

Zhan

2017

Water Resources Research

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Horizontal drilling has become an appealing technology for water resource exploration or aquifer remediation in recent decades, due to decreasing operational cost and many technical advantages over vertical wells. However, many previous studies on flow into horizontal wells were based on the Uniform Flux Boundary Condition (UFBC), which does not reflect the physical processes of flow inside the well accurately. In this study, we investigated transient flow into a horizontal well in an anisotropic confined aquifer laterally bounded by two constant-head boundaries. Three types of boundary conditions were employed to treat the horizontal well, including UFBC, Uniform-Head Boundary Condition (UHBC), and Mixed-Type Boundary Condition (MTBC). The MTBC model considered both kinematic and frictional effects inside the horizontal well, in which the kinematic effect referred to the accelerational and fluid-inflow effects. A new solution of UFBC was derived by superimposing the point sink/source solutions along the axis of a horizontal well with a uniform flux distribution. New solutions of UHBC and MTBC were obtained by a hybrid analytical-numerical method, and an iterative method was proposed to determine the well discretization required for achieving sufficiently accurate results. This study showed that the differences among the UFBC, UHBC, and MTBC solutions were obvious near the well screen, decreased with distance from the well, and became negligible near the constant-head boundary. The relationship between the flow rate and the drawdown was nonlinear for the MTBC solution, while it was linear for the UFBC and UHBC solutions.

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Section: Introductionmentioning

confidence: 99%

Intrawellbore kinematic and frictional losses in a horizontal well in a bounded confined aquifer

Wang

Zhan

2017

Water Resources Research

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“…Karlsson (), stated that a single HDD well would replace between 5 and 10 vertical wells. Parmentier and Klemovich (), stated it was as high as 30 and many others have attempted to quantify the number of vertical wells that a single horizontal well can replace (Cleveland, ; Fileccia, ; Koenigsberg, Piatt, & Robinson, ; Wilson, Kaback, & Oakley, ; Zhan, ; Zhan & Coa, ).…”

Section: Vertical Wells Versus Hdd Wellsmentioning

confidence: 99%

“…This cannot be accomplished with vertical wells but rather only with mini piezometers. This leads to a much larger contact area for an HDD well over that of a vertical well (Wilson et al, ). Several advancements have come about in the last decade to include the placement of multiport HDD wells (Koenigsberg et al, ).…”

Section: Vertical Wells Versus Hdd Wellsmentioning

confidence: 99%

New perspectives on horizontal to vertical well ratios for site cleanup

Laton

2019

Remediation Journal

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Directional drilling has been used for a variety of purposes, including utilities, dewatering, and remedial activities. Using this method for site cleanup versus traditional vertical extraction wells needs to be considered based upon today's remedial challenges. Traditionally, it has been stated that a single horizontal well can substitute for up to 11 vertical wells. This "rule" is arbitrary, since length and depth of the plume, surface access, and hydrogeological conditions must be considered. A better way to evaluate the cost-benefit of a horizontal versus vertical well system is a predicted zone of influence using a mathematical and hydrogeological approach, as described herein.

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Analytical study of capture time to a horizontal well

Zhan

1999

Journal of Hydrology

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Industry survey for horizontal wells. Final report

Abstract: The attached document was completed under the direction of the Environmental Sciences Section, Geotechnical Group of the Savannah River Technology Center, Westinghouse Savannah River Company. I have reviewed the document, and to the best of my knowledge, it is true, accurate, and correct.

Cited by 5 publications

References 0 publications

Intrawellbore kinematic and frictional losses in a horizontal well in a bounded confined aquifer

Intrawellbore kinematic and frictional losses in a horizontal well in a bounded confined aquifer

New perspectives on horizontal to vertical well ratios for site cleanup

Analytical study of capture time to a horizontal well

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