A New Operational Paradigm for Small‐Scale <scp>ASR</scp> in Saline Aquifers

Ginkel, Marloes van; Olsthoorn, Theo; Bakker, Mark

doi:10.1111/gwat.12113

Cited by 12 publications

(10 citation statements)

References 15 publications

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“…Kacimov et al () explored a mathematically similar situation with horizontal oil wells at late stages of a secondary EOR: a light hydrocarbon bubble resting above the well on a phreatic surface can suddenly emerge in the well, if the rate of pumping is suddenly increased (in this case, a positive surprise to a reservoir engineer). A similar accumulation of a finite freshwater lens in a depressed (downconed) saline water table has been investigated by Van Ginkel et al ().…”

Section: Saline Protruding Lens Under Line Sinkmentioning

confidence: 69%

Analytical Solution for Interface Flow to a Sink With an Upconed Saline Water Lens: Strack's Regimes Revisited

Kacimov

2018

Water Resources Research

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A study is made of a steady, two‐dimensional groundwater flow with a horizontal well (drain), which pumps out freshwater from an aquifer sandwiched between a horizontal bedrock and ponded soil surface, and containing a lens‐shaped static volume of a heavier saline water (DNAPL‐dense nonaqueous phase liquid) as a free surface. For flow toward a line sink, an explicit analytical solution is obtained by a conformal mapping of the hexagon in the complex potential plane onto a reference plane and the Keldysh‐Sedov integral representation of a mixed boundary‐value problem for a complex physical coordinate. The interface is found as a function of the pumping rate, the well locus, the ratio of liquid densities, and the hydraulic heads at the soil surface and in the well. The shape with two inflexion points and fronts varies from a small‐thickness bedrock‐spread pancake to a critical curvilinear triangle, which cusps toward the sink. The problem is mathematically solvable in a relatively narrow band of geometric and hydraulic parameters. A similar analytic solution for a static heavy bubble confined by a closed‐curve interface (no contact with the bedrock) is outlined as an illustration of the method to solve a mixed boundary‐value problem.

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Section: Saline Protruding Lens Under Line Sinkmentioning

confidence: 69%

Analytical Solution for Interface Flow to a Sink With an Upconed Saline Water Lens: Strack's Regimes Revisited

Kacimov

2018

Water Resources Research

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“…In order to re-enable recovery of freshwater, the deepest wells of the MPPWs (AW1S3 and AW2S3) were transformed to interception wells or "Freshkeepers" (Stuyfzand and Raat, 2010;Van Ginkel et al, 2014), abstracting the intruding saltwater and injecting this in a deep injection well in Aquifer 2 at of distance 200 m from the ASR site. This way, an acceptable water quality (Cl < 50 mg L −1 ) could be recovered at AW2S1 and AW1S2 again (from 15 April onwards).…”

Section: Cycle 2 (2013-2014): Improving the Asr Operationmentioning

confidence: 99%

Consequences and mitigation of saltwater intrusion induced by short-circuiting during aquifer storage and recovery in a coastal subsurface

Zuurbier

Stuyfzand

2017

Hydrol. Earth Syst. Sci.

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Abstract. Coastal aquifers and the deeper subsurface are increasingly exploited. The accompanying perforation of the subsurface for those purposes has increased the risk of shortcircuiting of originally separated aquifers. This study shows how this short-circuiting negatively impacts the freshwater recovery efficiency (RE) during aquifer storage and recovery (ASR) in coastal aquifers. ASR was applied in a shallow saltwater aquifer overlying a deeper, confined saltwater aquifer, which was targeted for seasonal aquifer thermal energy storage (ATES). Although both aquifers were considered properly separated (i.e., a continuous clay layer prevented rapid groundwater flow between both aquifers), intrusion of deeper saltwater into the shallower aquifer quickly terminated the freshwater recovery. The presumable pathway was a nearby ATES borehole. This finding was supported by field measurements, hydrochemical analyses, and variable-density solute transport modeling (SEAWAT version 4; Langevin et al., 2007). The potentially rapid short-circuiting during storage and recovery can reduce the RE of ASR to null. When limited mixing with ambient groundwater is allowed, a linear RE decrease by short-circuiting with increasing distance from the ASR well within the radius of the injected ASR bubble was observed. Interception of deep short-circuiting water can mitigate the observed RE decrease, although complete compensation of the RE decrease will generally be unattainable. Brackish water upconing from the underlying aquitard towards the shallow recovery wells of the ASR system with multiple partially penetrating wells (MPPW-ASR) was observed. This "leakage" may lead to a lower recovery efficiency than based on current ASR performance estimations.

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“…3). This clay restricts the depth of the storage zone (Tijs 2014). In such shallow and extended artificial aquifers, freshwater is best injected and recovered by multiple fully penetrating wells.…”

Section: Artificial Aquifer Designmentioning

confidence: 99%

A New Operational Paradigm for Small‐Scale ASR in Saline Aquifers

Cited by 12 publications

References 15 publications

Analytical Solution for Interface Flow to a Sink With an Upconed Saline Water Lens: Strack's Regimes Revisited

Analytical Solution for Interface Flow to a Sink With an Upconed Saline Water Lens: Strack's Regimes Revisited

Consequences and mitigation of saltwater intrusion induced by short-circuiting during aquifer storage and recovery in a coastal subsurface

Aquifer design for freshwater storage and recovery in artificial islands and coastal expansions

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