Search

In the NW part of the Romania, there are geological conditions that allow to geothermal phenomena to manifest on the surface of the Earth. The limited exploitation of this energy resource is still limited by existing technologies and by the high cost of deep-water equipment. For a good image of the Romania's geothermal potential, we present, in our paper, the temperature map at 3000 m deep and the geothermal flow map on the surface. These maps were made with the Surfer program, based on the data obtained through digitalizing geothermal maps of Romania (scale 1: 1000000) using Surfer software, kriging method for interpolation. Also, we made maps with other geophysical parameters after smoothed and filtrated of data (Bouguer anomaly, Free Air anomaly, geoid). The Pannonian geothermal aquifer is multi-layered, confined and is located in the sandstones at the basement of the Upper Pannonian (late Neocene age), on an approximate area of 2,500 km2 along the western border of Romania, from Satu Mare in the north to Timisoara in the south. The aquifer is situated at the depth of 800 m to 2,400 m. It was investigated by more than 100 geothermal wells, all possible producers, out of which 33 are currently exploited. The thermal gradient is 45-55°C/km and the wellhead temperatures range are between 50°C and 85°C. In the area of Oradea, Baile Felix and 1 Mai, drillings have been made and geothermal waters have been exploited for therapeutic purposes for more than 100 years. Lately, systematic actions have been launched to prospect, explore, evaluate and exploit geothermal deposits. In all geological formations there are aquifers layers with very varied thermal capacities and properties, with surface thermal fluxes higher than other areas. The most important thermal aquifer system of the Pannonian Depression is the system based on the upper Pannonian, highlighted by surveys. The water in this system is generally eruptive due to the high dissolved gas content. Because of this, they can be used especially for therapeutic purposes and domestic hot water. [ABSTRACT FROM AUTHOR]

The subject of contribution is solution a review of the presented territory, where is located geothermal borehole GTH-1, to evaluate the properties of the well and calculate the potential energy of the well. After finding the heat energy potential, contribution will focus on the design of appropriate use and potential solutions to the problems associated with it. A part of contribution is to assess the current situation in the use of geothermal energy as a whole in the Slovak Republic in comparison with other countries. In this area, concludes that despite several implemented and currently implemented many projects remain unused wells and geothermal potential, which we have not used as in neighboring countries. Exploitation of geothermal borehole GTH-1 in the village Kaluza can change that situation. After determining the parameters of the borehole as flow, specific heat of water and the temperature difference calculated potential energy work well. As a way to harness the potential proposed aquapark. After sizing pool determines the need for thermal power to heat water. The contribution concludes that output borehole GTH-1 is not sufficient, as a solution to propose the installation of two heat pumps. The result of the solution is sufficient thermal power to heating the water in the model aquapark. [ABSTRACT FROM AUTHOR]

In 2016 Pasztor and Schultz[1] proposed an analytical method for calculating a perforation design's effect on hydrocarbon-well inflow, using a new concept to analyze the effect of the shape of the perforation channels' drainage area. The method compares well with standard industrial methods used to calculate the pressure drop caused by a given perforation design. In 2017 Toth and Pasztor[2] applied their model to investigate geothermal-well inflow, and achieved promising results. The model's complexity makes it unsuitable for optimizing the perforation design. Our aim was rather to develop a new algorithm based on the original model, one which could then be used for the optimization. In investigating the different perforation parameters' effect on productivity, we introduced a design coefficient which resulted in a new optimization method. This directly correlates to the well's productivity. [ABSTRACT FROM AUTHOR]

Coverage of Slovakia's energy needs depends primarily on collecting energy from abroad (mostly from the Russian Federation). Therefore, the state is inclined to making substantial use of renewable energy sources, which are also environmentally less aggressive. Slovakia has a significant potential in geothermal energy. The systematic investigation of geothermal energy sources using geothermal wells started in 1971 in Slovakia. There are 120 registered geothermal wells in Slovakia, which proved about 1787 l.s-1 of geothermal waters with the temperature ranging from 18 to 129°C on the wellhead. The heat output of the utilized geothermal waters to reference temperature of 15°C is 306,8 MWt. Mentioned outputs represent 5,5% of the total geothermal energy potential of Slovakia which was evaluated to 6653,0 MWt by geological research. The geothermal waters are used at 36 sites in total for district heating, agriculture and recreation. It was distinguished 26 geothermal areas for obtaining and use of geothermal water. Differing degree of available hydrogeothermal exploration results is characteristic for particular geothermal areas. A number of geothermal water reservoirs in Slovakia and the existence of many district heating systems, with utilization of geothermal energy are ideal conditions for expansion of geothermal projects. For the purpose of assessment utilization of geothermal resources was created a computer model. This model reflects technical and economic constraints. Input parameters working with this model include temperature, yield and relevant level of mineralization, respectively chemical type of water. Among the additional parameters of this model belongs availability of resources with sufficient disposal capacity, the possibility of reinjection the geothermal waters, as well as the availability of delivery points, or the possibility of central heating. Use of this model may be a useful tool in decision-making activities on the direction of investment in a particular area of geothermal energy utilization. [ABSTRACT FROM AUTHOR]