• Energy Research

Suspended and abandoned wells present a considerable opportunity for renewable energy production, whether in the form of thermal, electrical, or combined energy. By utilizing existing infrastructure to harness these forms of energy, it is possible to reduce negative environmental impacts while simultaneously increasing energy efficiency and sustainability. This approach contributes to reducing dependence on fossil fuels and promotes the development of technologies based on renewable energy sources. Suspended wells offer the advantage of being immediately ready for use when needed, making them an efficient solution. In this paper, completion of suspended and abandoned wells for the production of thermal and/or electrical energy is presented.

Southeastern Europe (SEE), which includes Serbia, along with Germany and Poland, is one of the largest producers of solid fuels in Europe. Despite growing environmental concerns, coal, especially lignite, persists and remains the dominant fuel for electricity generation in this region. Concurrently, these power plants emerge as the predominant emitters of pollutants in all the observed states. To conduct a comprehensive analysis, data on major emitters within the EU were gathered, allowing for a detailed comparison with SEE countries. A specific focus was placed on the thermal power plant Kostolac in Serbia, where the calculation of SO2 emissions for two thermoblocks was undertaken. Comparisons were drawn with emitters in EU countries, with a particular emphasis on SEE nations. The analysis involved data from wells that have undergone excavation over specific periods, facilitating an exploration of the correlation between calculated values, those from exploited wells, and projections of future SO2 emissions from new wells in areas earmarked for surface mining exploitation.

Artificial lift methods have applications in oil wells where oil production is no longer possible due to natural reservoir energy, so this necessary energy is added by introducing lift methods. In order to achieve optimum production, the selection of an artificial lift method is very important. This paper uses fuzzy logic as a mathematical and conceptual model for selection of the optimal artificial lift method. The outcome or IF-THEN rules, as the central part of the model, is based on empirical data from the selected oil fields. Results are presented in two ways: according to the surfaces of irregular geometric bodies, and their gravity with the scattering of results, i.e., on smaller and greater possibilities of interpreting results when there are small differences in outputs. Finally, a sensitivity analysis of the model is presented.

Abstract Since 2012, when Serbia became a candidate for European Union membership, the harmonization of the Serbian energy policy regulatory framework in compliance with EU energy acquis has been accelerating. An umbrella framework adopted recently as a basis for conducting reforms in all Serbian energy sub-sectors involves a new Energy law that transpose the EU Third Energy Package and a new Energy Development Strategy of Serbia by 2025, with projections to 2030. The priorities of Serbian energy policy are increasing energy security supply, the further development of the energy market, and provision of sustainable energy development. The adopted strategic objectives for the oil sector are: providing a secured supply on the domestic market in petroleum products whose quality meets the highest EU standards; reduction of import dependency, and securing new crude oil supply routes. This paper provides an overview of the Serbian oil sector reforming progress concerning adoption of new legislation relating to key issues for adjustment with EU directives. Also, it represents new activities and major development projects in the oil sector, including projects that contribute to the development of the Serbian oil sector on the principles of sustainability.