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147 items
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Double traveling valve increases rod-pump efficiency
Traditional sucker rod pumps (SRP) use a single traveling valve, but recent double traveling valve innovations have improved SRP performance and efficiency in field applications with double traveling valves installed in pumps with top mechanical seating. The valves sealed better and produced similar fluid volumes compared with the previous single-valve pumps. They also enabled a reduction in pump diameter and optimized usage of surface equipment. Overall, the double travel valve SRPs produced stable production rates and annual production targets.Miloš Petrović, Bojan Martinović, Milica Ješić, Miroslav Crnogorac. "Double traveling valve increases rod-pump efficiency" in Oil & Gas Journal (2023)
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The different approaches in seismic stratigraphy interpretation
Dejan Radivojević (2018)U tekstu su prikazana dva osnovna pristupa u seizmostratigrafskoj interpretaciji. Prvi kao polaznu osnovu ima seizmičke sekcije, čija se interpretacija u kasnijoj fazi koreliše sa bušotinskim podacima. Drugi u prvoj fazi analizira podatke dobijene dubokim bušenjem koji se kasnije korelišu sa seizmičkim sekcijama. Prikazan je hronološki redosled i objašnjen postupak pri seizmostratigrafskoj interpretaciji oba pristupa. Ovakav način interpretacije omogućio je naftnim kompanijama detaljnije i preciznije sagledavanje geoloških odnosa, smanjenje rizika istraživanja i racionalnije projektovanje razradnih bušotina.seizmostratigrafija, istraživanje nafte i gasa, karakteristične seizmičke sekvence, seiz-mofacijalna analiza... approaches. Those interpretation approaches enabled oil companies a detailed and more precise insight into geological features, reduction of exploration risk and more rational design of development wells. Key words: seismic stratigraphy, oil and gas exploration, operational seismic sequence, seismic ...Dejan Radivojević. "The different approaches in seismic stratigraphy interpretation" in Tehnika – rudarstvo, geologija i metalurgija, Savez inženjera i tehničara Srbije, Beograd (2018). https://doi.org/10.5937/tehnika1802211R
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Convective heat transfer in centrifugal pumps lifted wells: the case of South-Eastern Europe waxy wells
Electric submersible pumps (ESP) are applied in wells where additional energy is needed to ensure discharge of the fluid to the surface through the tubing. At the discharge side of the pump the fluid has bigger velocity, thus the pump induces a forced convection between the fluid and the tubing inner surface. Understanding of convective heat transfer in wellbores and analyses of influential parameters provides a possibility to optimise value of convective heat transfer coefficient in order to avoid ...Bojan Martinovic, Marija Živković, Branko Grubač. "Convective heat transfer in centrifugal pumps lifted wells: the case of South-Eastern Europe waxy wells" in International Journal of Oil, Gas and Coal Technology, Inderscience Publishers (2021). https://doi.org/10.1504/IJOGCT.2021.10043281
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Upper Miocene depositional environments of the Kikinda-Mokrin High (Serbia)
Saša Ivanišević, Dejan Radivojević (2018)Exploration for oil and gas in mature areas, such as the Pannonian Basin, can benefit from reexamination of old data using more advanced modern workflows that focus on the temporal and spatial aspects of sediment deposition. Specifically, we apply a new environment of deposition model that interprets the Upper Miocene- Pliocene sediments as being deposited in a rapidly filling basin characterized by quick shelf edge progradation from the northwest toward the southeast. Reconstruction of this shelf edge trajectory reveals ...Saša Ivanišević, Dejan Radivojević. "Upper Miocene depositional environments of the Kikinda-Mokrin High (Serbia)" in Interpretation, AAPG SEG (2018). https://doi.org/10.1190/INT-2017-0084.1
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Termičke metode povećanja iskorišćenja naftnih ležišta
Vesna Karović Maričić (2019)Vesna Karović Maričić. Termičke metode povećanja iskorišćenja naftnih ležišta, Beograd : Univerzitet u Beogradu, Rudarsko-geološki fakultet, 2019
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Анализа примене утискивања полимера за повећање искоришћења лежишта „Х“
Јана Ивановић (2024)Лежиште „Х“ се налази у Панонском басену и део је нафтно-гасног поља „ХХ“.С обзиром на висок удео воде у произведеном флуиду на лежишту је потребно применити неку методу којом би се смањила брзина напредовања фронта воде ка производним бушотинама, односно смањио удео воде у производњи. Овај рад има за циљ да детаљно испита могућност примене једне од допунских метода повећања искоришћења лежишта, методе утискивања полимера на изабраном лежишту „Х“. Први део рада приказује основне теоријске појмове на којима се ...... enhanced oil recovery using polymer flooding: Fundamentals, experimental and numerical simulation”, KeAi Journals, Petroleum, 2020. 52 [11] Freire Marcelo, B. Z. L. Moreno Rosangela, „Polymer Flooding Jor Enhanced Oil Recovery”, 2019. [12] Green D.W., G.P. Wilhite, „Enhanced Oil Recovery” ...
... Jlooding in heavy oil recovery”, 2011. [6] Dao Saleh Laila, Wei Mingzen, Bai Baojun, „Data Analysis and Updated Screening Criteria for Polymer Flooding Based on Oilfield Data”, SPE&Reservoir Evaluation&Engineering, 2014. [7] Delamaide Eric, „Polymer Flooding of Heavy Oil - From Screening to ...
... Recovery”, Society of Petroleum Engineers, 1998. [13] Hinkley Richard, Brown Glenn, „Polymer Enhanced Oil Recovery“, Oil&Gas Authority, 2017. [14] Ibiam Emmanuel, „Numerical Simulation and Optimisation of Polymer Flooding ı in a Heterogenous Reservoir: Constrained Versus Unconstrained Optimisation” ...Јана Ивановић. Анализа примене утискивања полимера за повећање искоришћења лежишта „Х“, 2024
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Environmental Energy Security Indicators as Tools for Environmental Protection
Еколошка прихватљивост је постала незаменљив синтезни показатељ сваке валидне енергетске анализе у последње две-три деценије. Енергетска безбедност је у директној хармонији с еколошком прихватљивошћу кроз многе прописане политичке циљеве, економске користи, правне тековине итд. Индикатори еколошке сигурности представљају један од основних елемената за одређивање енергетске безбедности и снажне алате за усмеравање енергетског сектора ка одрживом развоју. У овом раду, анализа је била концентрисана на показатеље енергетске безбедности у области животне средине који се односе на сектор природног гаса у ...енергетска безбедност, еколошки енергетски индикатори, заштита животне средине, еколошка прихватљивост... emission factors [13] Fuel Emission [kg CO2/GJ] Biomass 109.6 Peat 106 Stone coal 101.2 Brown coal 97.09 Lignite 96.43 Diesel 77.4 Crude oil 74.1 Kerosene 73.3 Gasoline 71.5 LPG 63.1 Natural gas 56.1 The amount of greenhouse gases emitted is standard expressed per tons of CO2eq ...
... fauna in the water itself [15]. Analyzes show that coal combustion is the largest source of sulfur oxide emissions. Petroleum derivatives and fuel oil also emit sulfur oxides, but to a lesser extent than in the case of coal [16]. Combustion of biomass does not lead to the emission of sulfur oxide ...
... produced for different energy products are given in Table 2. Table 2. The SO2 emission factors [16] Fuel Emission [g SO2/GJ] Coal 1000 Fuel-oil 670 Natural gas 0 Fire wood 0 3.2.2 Nitrogen oxides (NOx) Nitrogen damage is manifested through combustion sub-products - nitrogen oxides ...Aleksandar Madžarević, Dejan Ivezić, Marija Živković , Miloš Tansijević. "Environmental Energy Security Indicators as Tools for Environmental Protection" in Mining and Environmental Protection-MEP 2019, University of Belgrade, Faculty of Mining and Geology (2019)
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Long-term planning methodology for improving wood biomass utilization
The insufficiently developed forest management system is often followed by undeveloped forest resources supply chain and insufficient institutional support. These cause inefficient usage of fuel-wood as well as huge amounts of unused forest residues. In order to achieve optimal and long-term sustainable utilisation of biomass, an original methodology based on the interaction of mathematical optimization and backcasting approach has been developed. Mathematical optimization is used for both generation and consideration of techno-economic parameters of the forest biomass supply chain. ...Vladimir Vukašinović, Dušan Gordić, Marija Živković, Davor Koncalović, Dubravka Živković. "Long-term planning methodology for improving wood biomass utilization" in Energy, Elsevier BV (2019). https://doi.org/10.1016/j.energy.2019.03.105
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The analysis of the geothermal energy capacity for power generation in Serbia
Jana Stojković, Goran Marinković, Petar Papić, Mihailo Milivojević, Maja Todorović, Marina Ćuk (2013)... and Debrc. The geothermal flow rate is 2.5 l/s and the water temperature is 48 °C, about 7.5 tons of fuel oil or 82.6 MWh of heat en- ergy may be saved per heating season (assuming the fuel oil heat capacity was 40 MJ/kg. Methodology Samples of groundwater were collected for this research during 2011-2012 ...
... and Debrc. The geothermal flow rate 1s 2.5 I/s and the water temperature is 48 °C, about 7.5 tons of fuel oil or 82.6 MWh of heat en- ergy may be saved per heating season (assuming the fuel oil heat capacity was 40 MJ/kg. Methodology Samples of groundwater were collected for this research during 2011-2012 ...Jana Stojković, Goran Marinković, Petar Papić, Mihailo Milivojević, Maja Todorović, Marina Ćuk. "The analysis of the geothermal energy capacity for power generation in Serbia" in Thermal Science, National Library of Serbia (2013). https://doi.org/10.2298/TSCI120215033S
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The Fuzzy–AHP Synthesis Model for Energy Security Assessment of the Serbian Natural Gas Sector
Natural gas is used for the production of almost 20% of total energy today. The natural gas security of the Republic of Serbia is an urgent strategic, political and security issue. Serbia is one of the most vulnerable countries in Southeast Europe, because it only has one supply route. This study is a contribution to efforts to better understand the factors affecting energy security through the implementation of a new methodology based on the fuzzy–AHP synthesis model for measuring ...... directly connected with WWI and oil demand for the military [3]. Some years before and soon after the energy crisis in 1970s, energy security became an important field of academic research [4]. Although the academic interest in energy security declined with the stabilization of oil prices in the 1980s and 1990s ...
... the 1980s, energy security is was defined as the stable supply of cheap oil under threats of embargoes and price manipulations by exporters [6,7]. Contemporary energy security studies deal with security issues extending beyond oil supplies [8]. Symmetry 2020, 12, 908; doi:10.3390/sym12060908 www.mdpi ...
... directly connected with WWI and oil demand for the military [3]. Some years before and soon after the energy crisis in 1970s, energy security became an important field of academic research [4]. Although the academic interest in energy security declined with the stabilization of oil prices in the 1980s and 1990s ...Aleksandar R. Madžarević, Dejan D. Ivezić, Miloš L. Tanasijević, Marija A. Živković. "The Fuzzy–AHP Synthesis Model for Energy Security Assessment of the Serbian Natural Gas Sector" in Symmetry, MDPI AG (2020). https://doi.org/10.3390/sym12060908
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The Rift Sequence Stratigraphy of the Itebej Field (Pannonian Basin, Serbia)
... syn-rift carbonate reservoir rocks have high-quality petrophysical properties with commercial quantities of heavy to heavy medium paraffin-base crude oil. The seal rock are deep-water syn-rift pelagic sediments and hemipelagic post-rift marls of the Lake Pannon. Keywords: Central Paratethys, Itebej field ...Saša Ivanišević, Jelena Radišić, Ivana Isić, Dejan Radivojević. "The Rift Sequence Stratigraphy of the Itebej Field (Pannonian Basin, Serbia)" in AAPG Vienna, Paratethys petroleum systems between Central Europe and the Caspian Region, Vienna, 26-27 mart, 2019, AAPG (2019)
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Overcoming the Low Oral Bioavailability of Deuterated Pyrazoloquinolinone Ligand DK-I-60-3 by Nanonization: A Knowledge-Based Approach
Jelena R. Mitrović , Branka Divović-Matović, Daniel E. Knutson, Jelena B. Ðoković, Aleksandar Kremenović, Vladimir D. Dobričić, Danijela V. Randjelović, Ivana Pantelić, James M. Cook, Miroslav M. Savić, Snežana D. Savić (2021)Poor water solubility of new chemical entities is considered as one of the main obstacles in drug development, as it usually leads to low bioavailability after administration. To overcome these problems, the selection of the appropriate formulation technology needs to be based on the physicochemical properties of the drug and introduced in the early stages of drug research. One example of the new potential drug substance with poor solubility is DK-I-60-3, deuterated pyrazoloquinolinone, designed for the treatment of various neuropsychiatric ...... are listed: medium-chain triglyc- erides, propylene glycol (Fagron GmbH & KG, Barsbüttel, Germany), soybean oil (Lipoid Purified Soybean Oil 700, Lipoid GmbH, Ludwigshafen, Germany), castor oil, isopropanol, benzyl alcohol, polyethylene glycol 400, sodium lauryl sulfate (Sigma-Aldrich Labor- chemikalien ...
... hydrochloride acid, phosphate buffer (pH 6.8), benzyl alcohol, polyethylene glycol 400, commonly used oils (medium-chain triglycerides, soybean oil, and castor oil), and organic solvents (isopropanol, methanol, ethanol, and dimethyl sulfoxide) at 25 ◦C was investigated by the shake flask method. An excess ...
... 5.23) 6.34 ± 1.14 0.1 M HCl (pH 1.2) 7.21 ± 0.40 Phosphate buffer (pH 6.8) 7.75 ± 1.09 Medium-chain tryglycerides 50.33 ± 7.19 Soybean oil 13.81 ± 0.69 Castor oil 57.96 ± 1.79 Benzyl alcohol 10,373.53 ± 371.41 Polyethylene glycol 400 8224.72 ± 103.20 Isopropanol 1009.41 ± 19.50 Methanol 802.86 ± 103 ...Jelena R. Mitrović , Branka Divović-Matović, Daniel E. Knutson, Jelena B. Ðoković, Aleksandar Kremenović, Vladimir D. Dobričić, Danijela V. Randjelović, Ivana Pantelić, James M. Cook, Miroslav M. Savić, Snežana D. Savić. "Overcoming the Low Oral Bioavailability of Deuterated Pyrazoloquinolinone Ligand DK-I-60-3 by Nanonization: A Knowledge-Based Approach" in Pharmaceutics, MDPI, Basel, Switzerland (2021). https://doi.org/10.3390/pharmaceutics13081188
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A hundred years of Milutin Milanković's climate change theory - geological implications
Dejan Radivojević (2020)Миланковићева теорија циклуса објављена пре сто година је најважнија теорија у наукама које проучавају климу и имала је велики утицај на дисциплине које се баве Земљом. Ипак, његов рад је чекао више од педесет година да би добио потврду. Може се рећи да Миланковићев рад највећи утицај на геологију има у изради астрономске временске скале, подршци хипотези континенталног дрифта и палеоклиматологији. Добри резултати примене астрономске временске скале на неогене седименте иницирали су примену ове методе у мезозојским и у последње ...циклостратиграфија, астономска временска скала, геолошка временска скала, климатске промене, континентални дрифт... scientific cir- cles. People have become aware of its influence on the increased emission of carbon dioxide and tem- perature rise. As a result, many oil and other large manufacturing companies came under the public at- A hundred years of Milutin Milanković’s climate change theory – geological implications ...
... cognition]. zavod za udžbenike, 977 pp. NASIRIToUSI, N. 2017. Fossil Fuel Emitters and Climate Change: Unpacking the Governance Activities of Large oil and Gas Companies. Environmental Politics, 26 (4): 621–647. NICoLo, M., j., DICKENS, G. R. & HoLLIS, C. j. 2010. South Pacific intermediate water ...
... record. Palaeogeography, Palaeoclimatology, Pala eo - ecology, 142 (3–4): 123–138. RADIvojEvIć, D.N. 2020. Naftna industrija i klimatske promene [The oil industry and climate changes]. Tehnika, 75 (1): 31–37. RoUTLEDGE, R. 2013. Deep Time: The Story of Mother Earth. Retrieved from http://www.alpineanalytics ...Dejan Radivojević. "A hundred years of Milutin Milanković's climate change theory - geological implications" in Geološki anali Balkanskoga Poluostrva, Univerzitet u Beogradu, Rudarsko geološki fakultet (2020). https://doi.org/10.2298/GABP201125011R
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Utilizing sewage wastewater heat in district heating systems in Serbia: effects on sustainability
Marija Živković, Dejan Ivezić (2021)Transformation of the heating sector is recognized as being essential for ensuring reliable and afordable energy services provided with reduced consumption of energy sources and diminished impact on the environment and less import dependency. The possibility of utilizing energy sources that otherwise would be wasted needs to be considered and treated as a big advantage of district heating systems. Despite many advantages, sewage wastewater heat is still a mostly unused resource at the global level and a totally unused ...рекуперација топлоте из отпадних вода, систем даљинског грејања, топлотне пумпе, енергетске уштеде, емисија угљендиоксида, енергетска безбедност, Србија... (Madžarević et al. 2018). The second most used fuel, heavy oil, is produced in the country, but mainly from imported oil. Only coal and wood fuel can be considered as indigenous energy sources. Gas import dependency of 82.1% and oil import dependency of 75.9% makes overall import dependency of ...
... such systems. For pro- jection of the future energy mix, it is assumed that heat delivered by heat pumps will firstly substitute coal, then heavy oil and at the end natural gas. Such an approach and order of substitution is governed by the need for maximiz- ing the reduction of GHG emission and air ...
... reduction is due to the assumption that waste heat as heat source would firstly substitute environmentally less acceptable fuels (coal and heavy fuel oil). Analyses of expected effects can be further elaborated at the level of cities or DH companies. For the comparison with the present state and exploring ...Marija Živković, Dejan Ivezić. "Utilizing sewage wastewater heat in district heating systems in Serbia: effects on sustainability" in Clean Technologies and Environmental Policy, Springer Science and Business Media LLC (2021). https://doi.org/10.1007/s10098-021-02063-6
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A Model for Determining Fuzzy Evaluations of Partial Indicators of Availability for High-Capacity Continuous Systems at Coal Open Pits Using a Neuro-Fuzzy Inference System
This paper presents a model for determining fuzzy evaluations of partial indicators of the availability of continuous systems at coal open pits using a neuro-fuzzy inference system. The system itself is a combination of fuzzy logic and artificial neural networks. The system availability is divided into partial indicators. By combining the fuzzy logic and artificial neural networks, a model is obtained that has the ability to learn and uses expert judgment for that learning. This paper deals with the ...системи, континуални системи експлоатације (роторни багер-транспортер-дробилично постројење), рударство, расположивост, меко рачунарство, фази логика, ANN, ANFISMiljan Gomilanović, Miloš Tanasijević, Saša Stepanović, Filip Miletić. "A Model for Determining Fuzzy Evaluations of Partial Indicators of Availability for High-Capacity Continuous Systems at Coal Open Pits Using a Neuro-Fuzzy Inference System" in Energies, MDPI AG (2023). https://doi.org/10.3390/en16072958
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Influence of paleoenvironmental conditions on distribution and relative abundance of saturated and aromatic hydrocarbons in sediments from the NW part of the Toplica basin, Serbia
Nikola Burazer, Aleksandra Šajnović, Nebojša Vasić, Milica Kašanin-Grubin, Dragana Životić, João Graciano Mendonça Filho, Predrag Vulić, Branimir Jovančićević (2020)Nikola Burazer, Aleksandra Šajnović, Nebojša Vasić, Milica Kašanin-Grubin, Dragana Životić, João Graciano Mendonça Filho, Predrag Vulić, Branimir Jovančićević. "Influence of paleoenvironmental conditions on distribution and relative abundance of saturated and aromatic hydrocarbons in sediments from the NW part of the Toplica basin, Serbia" in Marine and Petroleum Geology, Elsevier BV (2020). https://doi.org/10.1016/j.marpetgeo.2020.104252
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Managing mining project documentation using human language technology
Purpose: This paper aims to develop a system, which would enable efficient management and exploitation of documentation in electronic form, related to mining projects, with information retrieval and information extraction (IE) features, using various language resources and natural language processing. Design/methodology/approach: The system is designed to integrate textual, lexical, semantic and terminological resources, enabling advanced document search and extraction of information. These resources are integrated with a set of Web services and applications, for different user profiles and use-cases. Findings: The ...Digital libraries, Information retrieval, Data mining, Human language technologies, Project documentationAleksandra Tomašević, Ranka Stanković, Miloš Utvić, Ivan Obradović, Božo Kolonja . "Managing mining project documentation using human language technology" in The Electronic Library (2018). https://doi.org/10.1108/EL-11-2017-0239
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Assessments of effects of implementation of strategic plans for development of Belgrade District heating system
The district heating system (DHS) is one of the key elements of the Belgrade energy system. Overview of the current state and basic characteristics of the DHS are presented in this paper. The focus is on the planned development of DHS and on the analyses of effects of realization of measures and projects defined by strategic documents related to DHS which are adopted by city authorities (Development Strategy of DHS and Strategy of Belgrade Development). Two exploratory scenarios were ...Dejan Ivezić, Marija Živković, Aleksandar Madžarević, Miodrag Grujić. "Assessments of effects of implementation of strategic plans for development of Belgrade District heating system" in Sustainable Cities and Society, Elsevier BV (2020). https://doi.org/10.1016/j.scs.2020.102304
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Energetska bezbednost sektora prirodnog gasa Srbije
U prve dve decenije 21. veka obezbeđivanje sigurnosti snabdevanja prirodnim gasom domaćeg tržišta bio je jedan od prioriteta razvoja energetike Srbije. Istovremeno, aspekt sigurnog snabdevanja bio je neizostavni deo slagalice stvaranja energetske bezbednosti. Izražena uvozna zavisnost je dominantna karakteristika sektora prirodnog gasa, tačnije, Republika Srbija je snažno zavisna od ruskog gasa, sa više od 80% uvezenih količina gasa, a do pre dve godine snabdevala se isključivo kroz jednu interkonekciju. U radu se razmatra aktuelna situacija u sektoru prirodnog ...... Mining and Geology, University of Belgrade. He graduated, completed his master's studies, and received his doctorate in the scientific field of oil mining, mechanization, and automation in mining, at the Faculty of Mining and Geology, University of Belgrade, where he was first elected to the ...Aleksandar Madžarević, Predrag Jovančić, Miroslav Crnogorac. "Energetska bezbednost sektora prirodnog gasa Srbije" in 36. Međunarodni kongres o procesnoj industriji – Procesing ’23, Šabac, 1. i 2. juna 2023. , Beograd : Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije (SMEITS) Društvo za procesnu tehniku (2023)
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Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal
Ivan Kojić, Achim Bechtel, Nikoleta Aleksić, Dragana Životić, Snežana Trifunović, Gordana Gajica, Ksenija Stojanović (2021)... main difference between the composi- tions of liquid lignite/HDPE pyrolysate and crude oil is reflected through the presence of n-alkenes and n-dienes in pyrolysate (Figure S3; Table 6), which are absent in crude oil. However, the presence of these unsaturated hydrocarbons in liquid co-pyrolysate does ...
... estimation of the origin, type/quality, depositional environment, maturity, and hydrocarbon generation potential of sedimentary organic matter (OM) in the oil shale, coal, and source rocks [27–31]. In the last 15 years, much attention has been given to thermal treatment of coal/plastic blends. Namely, hydrocarbon ...
... PE co-pyrolysis product at 500 ◦C, as documented by bulk composition and GC–MS analysis of individual hydrocarbons, is comparable to those of crude oil of terrestrial origin. Elemental analysis and Rock-Eval pyrolysis showed that the co-pyrolysis solid residues contain a higher amount of organic carbon ...Ivan Kojić, Achim Bechtel, Nikoleta Aleksić, Dragana Životić, Snežana Trifunović, Gordana Gajica, Ksenija Stojanović. "Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal" in Polymers, MDPI AG (2021). https://doi.org/10.3390/polym13050759