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The influence of borehole design on the production and efficiency parameters of wells intaking Quaternary waters in the south of Łódź

Macuda J., Styrkowiec E.

AGH Drilling, Oil, Gas

2017

Vol. 34, no. 4

895--906

Quaternary wellbores are very liable to rapid drops of hydraulic efficiency mainly caused by clogging processes and the corrosion of the wellbore structure. The presence of such processes and their intensity largely depend on the hydrogeochemical conditions of the intaken aquifer and also the production rate and extraction method of a given wellbore. Among the major factors slowing down the hydraulic intensity are a correctly designed well, especially the properly selected type and design of the filter. A well designed wellbore filter should have low hydraulic resistance of the inflowing water and be resistant to clogging and corrosion in the given hydrochemical conditions. This allows for long and failure-free extraction of large high-production wells. The results of analyses of the effect of intake wellbore design on its hydraulic efficiency are presented in the paper. The intake wells producing Quaternary waters for waterworks in the southern part of Łódź were analyzed.

Utilization of high potential geothermal energy in the Czech Republic

Klempa M., Rado R., Bujok P., Janeckova N., Porzer M.

AGH Drilling, Oil, Gas

2016

Vol. 33, no. 1

195--203

In the Czech Republic the electrical energy and heat from geothermal energy can be generated with the use of Engineering/Enhancing Geothermal System (EGS). In this case a downhole heat exchanger is performed to a depth at which the temperature of the rock mass is at least 150–160°C or more, preferably about 200°C. Taking into account the geological conditions in the Czech Republic, such temperatures can be ob- served at about 5000–6000 m of depth. The site of a pilot project of geothermal electrical energy production was selected on the basis of the analysis of deep-seated geological structures in the Czech Republic, i.e. area of crust faults in the Ore Mountains Erzgebirge. The selected geological units consist of the Ore Mountains Fault and Central Bohemian Uplands, which are part of the Ohersky Rift Valley. Two deep research wells are planned in that area, with detailed geological, geophysical and geothermal analyses, including laboratory analyses of sampled rocks (cores).