Standing column wells

Investigation of Thermo-hydro-geochemical Processes in a Standing Column Well Intersected by a Fracture

“…More details on the simulation framework, boundary conditions, relation between reaction constants (ki, k-i) and temperature, or connection between fracture' aperture and calcite precipitation can be found in Eppner et al, (2015), Nguyen et al, (2015) and Pasquier et al, (2016).…”

“…A thermo-hydro-geochemical (THG) model coupling groundwater flow, heat transfer and reactive transport of dissolved species has been developed recently (Eppner et al, 2015Pasquier et al;2016) to investigate the risks of calcite dissolution and precipitation in the vicinity of a SCW. In this article, this THG model is used to explain complex interactions between thermal, hydraulic and geochemical processes which may cause precipitation and dissolution of calcite.…”

Hydrogeothermal characterization and modelling of a standing column well experimental installation

“…Results showed minimal deviation (MAE of 0.12 °C) from the inlet and outlet groundwater temperatures computed by the previous top-pumped simulation presented in Figure 5. These results suggest that installation and maintenance difficulties occasioned by the widespread down-pumped configuration of SCWs (Orio, et al 2005;Pasquier, et al 2016) could be avoided by placing the submersible pump in the annular region at the top of the well since both configurations provide, in the absence of bleed, the same EWT.…”

“…Groundwater was discharged from the SCW to a nearby storm sewer at a rate of 33 L/min to reflect a typical maximal bleed ratio of 30% (Orio, et al 2005;Pasquier, et al 2016). The water level was located at an initial depth of 2 m and was monitored during the test using pressure sensors with 0.5 cmH 2 O accuracy.…”

“…SCWs performance can be enhanced by discharging or bleeding part of the pumped water, an action that promotes groundwater flow and advective heat transfer around the well. This operation has been described as a key feature for maintaining the groundwater temperature within the heat pumps operational range in the peak heating conditions that frequently occur in cold climates (Spitler, et al 2002;Deng, et al 2005;Orio, et al 2005;Nguyen, et al 2015;Pasquier, et al 2016).…”