Execution Of A Triple Pumping Test And Interpretation By An Inverse Numerical Model

Lebbe, Luc; Mahauden, Michel; Breuck, William De

doi:10.1007/pl00010967

Cited by 21 publications

(13 citation statements)

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“…The efficiency of an ATES system relies on the hydraulic conductivity of the subsurface which governs the maximum pumping rate and the corresponding drawdown. Lebbe et al (1992) conducted a triple pumping test on Campus Sterre to determine the hydraulic parameters of the different layers. Pumping wells were drilled in the pervious layers Yd 2, Yd 4, and Yd 6 (named PP 2, PP 4 and PP 6 respectively).…”

Section: Pumping and Injectionmentioning

confidence: 99%

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Assessing the potential of low transmissivity aquifers for ATES systems: a case study in Flanders (Belgium)

Tas¹,

Simpson²,

Hermans³

2023

Preprint

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The Member States of the European Union pledged to reduce greenhouse gas emissions by 80-95% by 2050. Shallow geothermal systems might substantially contribute by providing heating and cooling in a sustainable way through seasonally storing heat and cold in the shallow ground (<200m). When the minimum yield to install a cost-effective aquifer thermal energy storage (ATES) system cannot be met, borehole thermal energy storage (BTES), relying mostly on the thermal conductivity of the ground, is proposed. However, for large-scale applications, this requires the installation of hundreds of boreholes which entails a large cost and high disturbance of the underground. In such cases, ATES systems can nevertheless become interesting. In this contribution, we present a case study performed on a Ghent University campus, where the feasibility of ATES in an area with a low transmissivity was determined. The maximum yield of the aquifer was estimated at 5 m³/h through pumping tests. Although this low yield was attributed to the fine grain size of the aquifer, membrane filtering index tests and long-term injection tests revealed that the clogging risk was limited. A groundwater model was used to optimize the well placement while limiting the risk of interactions between the wells resulting in a thermal breakthrough or flooding at the surface. It was shown that a well arrangement in a checkerboard pattern was most effective to reach these objectives. Hence, for large-scale projects, a minimal CO2 output might be reached using a (more cost-effective) ATES system even in low permeable sediments.

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Section: Pumping and Injectionmentioning

confidence: 99%

“…The main groundwater reservoir is situated below this formation. It has a uniform thickness of approximately 20 m and can be subdivided into 6 units according to Lebbe et al (1992) (Fig.…”

mentioning

confidence: 99%

Assessing the potential of low transmissivity aquifers for ATES systems: a case study in Flanders (Belgium)

Tas¹,

Simpson²,

Hermans³

2023

Preprint

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“…The slug test was interpreted using guidelines given by Butler (1998) and interpreted with the KGS model (Hyder et al, 1994). For Tertiary deposits, we estimated a horizontal hydraulic conductivity of 0.1 m∕d from previous studies (Lebbe et al, 1992). Vertical conductivity was taken ten times smaller for both cases and we estimated an effective porosity of 0.35, which is a typical value for sediments.…”

Section: Heat and Flow Transport Modelmentioning

confidence: 99%

A shallow geothermal experiment in a sandy aquifer monitored using electric resistivity tomography

et al. 2012

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Groundwater resources are increasingly used around the world for geothermal exploitation systems. To monitor such systems and to estimate their governing parameters, we rely mainly on borehole observations of the temperature field at a few locations. Bulk electric resistivity variations can bring important information on temperature changes in aquifers. We have used surface electric resistivity tomography to monitor spatially temperature variations in a sandy aquifer during a thermal injection test. Heated water (48°C) was injected for 70 hours at the rate of 87 l∕h in a 10.5°C aquifer. Temperature changes derived from time-lapse electric images were in agreement with laboratory water electric conductivity-temperature measurements. In parallel, a coupled hydrogeologic saturated flow and heat transport model was calibrated on geophysical data for the conceptual model, and on hydrogeologic and temperature data for the parameters. The resistivity images showed an upper flow of heated water along the well above the injection screens and led to a new conceptualization of the hydrogeologic source term. The comparison between the temperature models derived from resistivity images and from the simulations was satisfactory. Quantitatively, resistivity changes allowed estimating temperature changes within the aquifer, and qualitatively, the heated plume evolution was successfully monitored. This work demonstrates the ability of electric resistivity tomography to study heat and storage experiments in shallow aquifers. These results could potentially lead to a number of practical applications, such as the monitoring or the design of shallow geothermal systems.

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“…Mansour et al, 2011;Raghavan, 2004;Schad and Teutsch, 1994;Thorbjarnarson et al, 1998). Pumping tests have been simulated with finite difference (Barrash and Dougherty, 1997;Cheng and Chen, 2007;Halford and Yobbi, 2006;Kaleris et al, 1995;Lee et al, 2007;Leven and Dietrich, 2006;Mohamed and Rushton, 2006;Raghavan, 2009Raghavan, , 2006Schroth and Narasimhan, 1997), finite elements, and hybrid finite elements -finite difference models (Chen and Jiao, 1999;Lebbe et al, 1992). Radial flow models based on cylindrical coordinate grids are particularly appropriate for the simulation of pumping tests since they provide a more precise representation of the flow field around the pumping borehole (e.g.…”

Section: Introductionmentioning

confidence: 99%

Impact of model complexity and multi-scale data integration on the estimation of hydrogeological parameters in a dual-porosity aquifer

2018

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Execution Of A Triple Pumping Test And Interpretation By An Inverse Numerical Model

Cited by 21 publications

References 0 publications

Assessing the potential of low transmissivity aquifers for ATES systems: a case study in Flanders (Belgium)

Assessing the potential of low transmissivity aquifers for ATES systems: a case study in Flanders (Belgium)

A shallow geothermal experiment in a sandy aquifer monitored using electric resistivity tomography

Impact of model complexity and multi-scale data integration on the estimation of hydrogeological parameters in a dual-porosity aquifer

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