Претрага
315 items
-
Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention
Gas wells, particularly those situated onshore, play a vital role in the global energy sector by supplying a significant portion of natural gas. However, operational challenges, notably gas hydrate formation, pose substantial issues, leading to complications such as flowline blockages and unexpected well shutdowns. Gas hydrates, crystalline structures resembling ice, ...Gas Well, Gas Hydrate Formation, Well Modeling, Well Performance Optimization, Choke Position Adjustments, Methanol InjectionMilica Ješić, Bojan Martinović, Stefan Stančić, Miroslav Crnogorac, Dušan Danilović. "Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention" in Underground Mining Engineering, Beograd : Rudarsko-geološki fakultet (2023)
-
Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels
Irina Zahirovic, Dušan Danilović, Milica Šuput Vranjin, Miloš Tripković. "Laboratory Testing of Nanosilica- Reinforced Silicate and Polyacrylamide Gels" in SPE Journal (2023)
-
Preparation, synthesis and characterization of nanometric Ca0.9Er0.1MnO3
Tijana B. Vlašković, Bojana Laban, Maja Milošević, Maria Čebela, Vladimir Dodevski, Milena Rosić (2023)... a dual role (complexant and fuel), and metal nitrates were used as oxidants - calcium nitrate tetrahydrate Ca(NOs),x*4H,O, manganese(II) nitrate hydrate Mn(NOyx)xH,O, erbium(III) nitrate pentahydrate Er(NOs)sx5H,O. Nanopowder was prepared by combining metal nitrates in thcir respective stoichiometric ...Tijana B. Vlašković, Bojana Laban, Maja Milošević, Maria Čebela, Vladimir Dodevski, Milena Rosić. "Preparation, synthesis and characterization of nanometric Ca0.9Er0.1MnO3" in Programme and Book of abstracts 15th ECerS Conference for Young Scientists in Ceramics, Novi Sad, Serbia October 11-14, 2023 , Novi Sad : Faculty of Technology, University of Novi Sad (2023)
-
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... suggest that main factor for its occurrence was the sudden re- lease of methane hydrate from oceanic sediments caused by massive volcanic eruptions. Recent study by GINGERICH (2019) compared the rate of greenhouse gas accumulation in the PETM to modern climate change today (Fig. 10) and find out that ...
... recent research on the Trias- sic Chinle Formation in Petrified Forest National Park in Arizona confirms the existence of a foreseen 405.000-year Milanković’s cycle influenced by the movement of the planets jupiter and venus. The core samples from the Chinle Formation were dated and correlated to Newark Basin ...
... Earth’s oceans to reach Antarctica (Fig. 9). This seems to have played a key role in the formation of the icehouse due to the up- welling of cold water from the deeper parts of the water column that aided the formation of ice sheets. The Late Cenozoic Ice Age that began 33.9 mil- lion years ago was probably ...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
-
Synthesis and characterization of nanostructured Ca0.9Er0.1MnO3
Tijana B. Vlašković, Bojana Laban, Maja Milošević, Maria Čebela, Vladimir Dodevski, Milena Rosić (2023)... combustion method, sucrose Ci.H»Ori which is both fuel and complexant and metal ions in the form of calcium nitrate tetrahydrate, manganese(II) nitrate hydrate, erbium(III) nitrate pentahydrate were used. Metal nitrates and sucrose were combined to prepare this nanostructured in their appropriate stoichiometric ...Tijana B. Vlašković, Bojana Laban, Maja Milošević, Maria Čebela, Vladimir Dodevski, Milena Rosić. "Synthesis and characterization of nanostructured Ca0.9Er0.1MnO3" in Book of Abstracts Proceedings / 59th Meeting of the Serbian chemical society, Novi Sad, Serbia, June 1-2, 2023, Belgrade : Serbian Chemical Society (2023)
-
Investigation of nanostructured Ca0.9Er0.1MnO3 obtained by sucrose nitrate procedure
Tijana B. Vlašković, Bojana Laban, Maja Milošević, Maria Čebela, Vladimir Dodevski, Milena Rosić (2023)... sucrose, which plays the role of fuel and complexant. Other chemicals used are calcium nitrate tetrahydrate Ca(NOxy))x4H.O, manganese nitrate hydrate Mn(NOx)>xH»O, erbium nitrate pentahydrate Er(NOay)ax5H»O. Metal nitrates and sucrose were mixed in stoichiometric ratios, in order to obtain a perovskite ...Tijana B. Vlašković, Bojana Laban, Maja Milošević, Maria Čebela, Vladimir Dodevski, Milena Rosić. "Investigation of nanostructured Ca0.9Er0.1MnO3 obtained by sucrose nitrate procedure" in Program ; and the Book of abstracts The Eleventh Serbian Ceramic Society Conference »Advanced Ceramics and Application« September 18-20, 2023 Serbian Academy of Sciences and Arts, Belgrade, Serbia , Belgrade : Serbian Academy of Sciences and Art Serbia (2023)
-
Analysis Of the Process Of Carbon Capture Utilization And Storage In Underground Reservoirs
John Nyame (2024)The importance of mitigating the effects of global climate change has necessitated an in-depth exploration of innovative strategies to reduce carbon dioxide (CO2) emissions. Among these strategies, Carbon Capture, Utilization, and Storage (CCUS) has emerged as a promising and transformative solution. This master thesis delves into the diverse realm of CCUS processes, aiming to unravel the positives challenges, and opportunities within this dynamic field. The analysis begins with a systematic examination of carbon capture technologies, encompassing post-combustion, pre-combustion, and oxy-fuel combustion ...... wellhead therefore limiting any corrosion and hydrate formation. To be able to handle 1 Mt CO per year, four parallel units were needed. Each unit has a fluid knockout drum, a compressor, a cooler and a gas turbine driver. Again, the compressor train with its gas turbine drive was designed and installed ...
... HBauification — Gas treatment — Utilization Figure 3.2 Desalination process 3.2. Enhanced Oil Recovery Enhanced oil/gas recovery refers to the injection of materials into the reservoir to maintain the pressure in the formation and to release trapped oil/gas within the pores of the formation. The recovery ...
... operations with calcium oxide or be used as a feedstock for the synthesis of ammonia and chlorine. The hydrate-forming method is another technique that is used for desalination, and it involves the formation of hydrates by using CO2 to separate the salts from water [16]. A challenge with the desalination ...John Nyame. Analysis Of the Process Of Carbon Capture Utilization And Storage In Underground Reservoirs, 2024
-
A survey of greenhouse gases production in central European lignites
Anna Pytlak, Anna Szafranek-Nakonieczna, Weronika Goraj, Izabela Śnieżyńska, Aleksandra Krążała, Artur Banach, Ivica Ristović, Mirosław Słowakiewicz, Zofia Stępniewska (2021)... the Kolubara lignite, which released only 19.64 nmol CO2 g -1 day-1 (Fig. 5a). Desorption of CO2 gas from lignites requires the consideration of both physical desorption and biological de novo formation, which co- occur. It is a well-known phenomenon that low rank coals adsorb CO2 and that (due to ...
... materials (Prem et al., 2021). 3.3. Nitrous oxide formation Nitrous oxide is approximately 265 times more potent than CO2 in atmospheric warming and contributes to stratospheric ozone depletion (Liu et al., 2020). Most anthropogenic emissions of this gas occur in drained peatlands (Liu et al., 2020). Peat ...
... lignite remains largely unrecognized. Both the guidelines for national greenhouse gas inventories (Eggleston et al., 2006) and the recently updated version in- dicate that “surface mines may continue to emit methane as the gas leaks from the coal seams thatwere broken or damaged duringmining” but “there ...Anna Pytlak, Anna Szafranek-Nakonieczna, Weronika Goraj, Izabela Śnieżyńska, Aleksandra Krążała, Artur Banach, Ivica Ristović, Mirosław Słowakiewicz, Zofia Stępniewska. "A survey of greenhouse gases production in central European lignites" in Science of The Total Environment, Elsevier (2021). https://doi.org/10.1016/j.scitotenv.2021.149551
-
Productivity improvement with use of beam gas compressor: pilot test in Southeastern Europe mature field
Most of the wells in the oilfield Turija are operating with sucker rod pumps, where casing pressure at around 15 bar, and with marginal production rates. The high value of casing pressure indicates high pressure on the face of the formation and depends directly on well productivity. In addition, with increasing value of the casing pressure gas column in the annulus is moving the dynamic fluid level near pump intake and more gas is entering the pump, it results ...beam gas compressor, BGC, increase productivity, sucker rod pump, SRP, mature field, artificial lift, production optimisationBojan Martinović, Dušan Danilović, Branko Grubač, Robert Fadiga. "Productivity improvement with use of beam gas compressor: pilot test in Southeastern Europe mature field" in International Journal of Oil Gas and Coal Technology (2022)
-
Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae
Hans Peter Nytoft, Geir Kildahl-Andersen, Sofie Lindström, Frode Rise, Achim Bechtel, Danica Mitrović, Nataša Đoković, Dragana Životić, Ksenija A. Stojanović (2019)Two previously unidentified dehydroabietane isomers were isolated from Miocene Serbian lignite and Rhaetian (Late Triassic) coaly mudstones from South Sweden and characterized using NMRspectroscopy as cis- and trans-dehydroicetexane. Both have a 9(10?20)-abeo-abietane or icetexane skeleton, consisting of a 6-7-6 tricyclic framework with seven carbons in ring B instead of the usual six in common diterpanes of the abietane-type. Dehydroicetexanes can be detected using GC-MS-MS in m/z 270?146 chromatograms without interference from dehydroabietane or other isomers. Dehydroicetexanes are often abundant ...Hans Peter Nytoft, Geir Kildahl-Andersen, Sofie Lindström, Frode Rise, Achim Bechtel, Danica Mitrović, Nataša Đoković, Dragana Životić, Ksenija A. Stojanović. "Dehydroicetexanes in sediments and crude oils: Possible markers for Cupressoideae" in Organic Geochemistry, Elsevier BV (2019). https://doi.org/10.1016/j.orggeochem.2019.01.001
-
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
-
Late Triassic radiolarians from the Grivska formation, internal Dinarides, SW Serbia
Paleontology, Stratigraphy, Economic Geology, Geochemistry and Petrology, Geology, Geophysics, Geotechnical Engineering and Engineering Geology... are known in the Internal Dinarides under the name of “Grivska Formation”. This formation was infor- mally established by DIMITRIJEVIĆ & DIMITRIJEVIĆ (1991) and supposed to be synchronous with the lower part of Wetterstein Formation (Ladinian) (DIMITRIJEVIĆ & DIMITRIJEVIĆ, 1991). According to ...
... revised the Grivska Formation using new biostratigraphic and microfacial data. The age of Grivska Formation was determined on the base of conodonts as Late Triassic (Carnian-Rhaetian) (Su- DAR & GAWLICK, 2018). It should be noted that lime- stones ofthe Grivska Formation are characterized by ...
... The Grivska Formation was informally introduced by DIMITRIJEVIĆ: & · DIMITRIJEVIĆ (1987, 1991): the definition of this formation was not based on chronostratigraphy only, but it also took into ac- count lithostratigraphic and facial aspects. Sediments of the Grivska Formation were i ...Nikita Bragin, Liubov Bragina, Nevenka Đerić, Nataša Gerzina-Spajić. "Late Triassic radiolarians from the Grivska formation, internal Dinarides, SW Serbia" in Geološki anali Balkanskoga poluostrva (2019). https://doi.org/10.2298/GABP1901017B
-
Gas-lift wells optimization at the oil field "K"
Dušan Danilović, Marija Ilić, Miroslav Crnogorac, Lola Tomić. "Gas-lift wells optimization at the oil field "K"" in Podzemni radovi, University of Belgrade - Faculty of Mining and Geology (2022). https://doi.org/10.5937/podrad2241031D
-
Using gravity data to define structural correlation affecting the formation of Neogene basins
A gravity survey can help to define the structural correlation in the study area. The structures that have influenced the development of Neogene basins can be defined using gravity data. By applying mathematical transformations to gravity data, the geological structures (faults, nappes, etc.) that impacted the formation of Neogene basins can be defined. We have taken the part of the Dinarides as the test region. The paper presents the results obtained using the procedure residual, vertical gradient, and total ...Snežana Ignjatović, Ivana Vasiljević, Branisav Sretković, Milanka Negovanović. "Using gravity data to define structural correlation affecting the formation of Neogene basins" in The 54th International October Conference on Mining and Metallurgy, Bor Lake, Serbia, 18-21 October 2023, Bor : University of Belgrade, Technical Faculty in Bor (2023)
-
New approach to correlation of hydrocarbon reservoirs in sandstone layers of the "Mokrin" field"
Saša Ivanišević, Dejan Radivojević (2018)геофизички каротаж, депозиционе средине, лежишта угљоводоника, миоцен, пост‐ рифтнo, секвенциона стратиграфија... has shown that oil and gas reservoirs are developed in 404 turbidites of the Majdan Formation deposited at the bottom of the Pannonian Lake. Hydrocarbons accumulated in the Mokrin field reservoirs are generated in hemipelagic marls of the Hetin Formation deposited in the Banat ...
... Kikinda Formation sediments are deposited in shallow‐water environments and are recognized by progradation and aggradation series (Figure 1a and 1b). Kikinda Formation sediments are sealed by the Paludina Formation represented by fluvial sediments. Hemipelagic marls of the Hetin Formation are re ...
... dite sandstones, clay and marl. Turbidite sandstones are always depo‐ sited over the Hetin Formation marls, while they are, in turn, always sealed by sediments of the Mokrin Formation slope. Mokrin Formation is deposited on the slope, and almost across the entire exploration area it is represented ...Saša Ivanišević, Dejan Radivojević. "New approach to correlation of hydrocarbon reservoirs in sandstone layers of the "Mokrin" field"" in 17th Serbian Geological Congress, Vrnjačka Banja, 17-20 maj 2018, Srpsko geološko društvo (2018)
-
Age of the Jurassic hemipelagic sediments from the Ljubiš area (Zlatibor Mt., SW Serbia)
Nikita Bragin, Nevenka Đerić (2020)... the lower part of the Ljubiš Formation has a Middle Jurassic, ?Bajo cian to Bathonian age. 4. DISCUSSION The Ljubiš Formation was proposed by GAWLICK et al. (2017) as a possible age equivalent of the Middle to Upper Jurassic (Ba thonian-Tithonian) Gonje Formation (VISHNEVSKAYA et al., 2009) developed ...
... (YAO), Hexasaturnalis suboblongus (YAO), H. tetraspinus (YAO). Taking into account previous data from the upper part of the Ljubiš Formation, the age of the formation can be estimated to be in the interval from the ?Bajocian to Bathonian-Oxfordian. The new biostratigraphic data clearly show the ...
... distal slope or basinal facies represented by cherty lime stones (the “Grivska Formation”, DIMITRIJEVIĆ & DIMI- TRIJEVIĆ, 1991) and a Late Triassic reefal and slope facies (DIMITRIJEVIĆ, 1997). Recently, all Grivska Formation occur rences are attributed to the allochthonous and fartravelled nappe with ...Nikita Bragin, Nevenka Đerić. "Age of the Jurassic hemipelagic sediments from the Ljubiš area (Zlatibor Mt., SW Serbia)" in Geologia Croatica, Croatian Geological Survey (2020). https://doi.org/10.4154/gc.2020.11
-
Middle Jurassic terebratulide brachiopods from the Jordan Valley (northwestern Jordan)
U radu je izvršena revizija i detaljan opis srednjojurskih brahiopoda Jordanske doline, a takodje su izdvojeni i novi taksoni. Sa profila Arda iz gornjeg bata (Hamam formacija) i donjeg keloveja (Muganija formacija) odredjeni su novi rod i vrsta Jordanithyris ardainensis. Iz gornjeg bata Hamam formacije (krečnjaci, dolomiti, peščari i laporci) izdvojena je vrsta Ptyctothyris quillyensis. Zajednica koju čine Arabatia bihinensis, Ectyphoria sinaiensis, Ptyctothyris quillyensis, Dorsoplicathyris dorsoplicata i Tubithyris jurayfahiensis potiče iz donjokelovejskih krečnjaka sa proslojcima laporaca Muganija formacije. Brahiopodi ...Howard R. Feldman, Barbara V. Radulović, Vladan J. Radulović, Fayez Ahmadc. "Middle Jurassic terebratulide brachiopods from the Jordan Valley (northwestern Jordan)" in Historical Biology, Taylor & Francis (2021). https://doi.org/10.1080/08912963.2019.1625347
-
Integrative GHG Assessment in Oil and Gas Industry
Reducing greenhouse gas emissions is one of the main targets of national strategies in European countries. As a main contributor to emissions, the energy sector is recognized as the most promising to apply measures and actions aimed to decrease GHG emissions. The Oil and Gas industry as a significant contributor to global greenhouse gas emissions is facing a growing need for estimating, mitigating, and reducing the impact of their operations on the atmosphere to stay competitive in a newly ...... CHa oil/gas oil/gas R eference CHa mol % () MwCO, _“ctuall CO) mol % MwCHa Reference CHA mol % Fco, = EcHa' () where: KEcna - Emissions of CHa; TFIiyeas – Facility Throughput of oil or gas; EPxileas – Emissions Factor for oil or gas; Eco: - Emissions of CO». Fmissions from gas flaring ...
... sources of emission in the Oil and Gas industry. This paper presents the comprehensive blucprint for the development of a greenhouse gas emissions inventory for the casec of complex industries such as Oil and Gas, including its specifics related to processes of Oil and Gas production and processing (flaring ...
... upstream oil and gas company, with the aim to identify the main sources of emission. It was shown that the major sourcc of emission is gas flaring, while the kecy contributor is uncombusted methane. Index Terms - Energy transition, Greenhouse gas cemissions, Industry, Oil&Gas. Rezime – Smanjenje ...Aleksandar Mirković, Marija Živković, Stevan Đenadić, Darja Lubarda, Chinedu Anyanwa. "Integrative GHG Assessment in Oil and Gas Industry" in Energija, ekonomija, ekologija (2023). https://doi.org/10.46793/EEE23-1.51M
-
Influence of geological substrate on runoff formation, a case study: small river catchments in southeastern Serbia of similar size and with comparable pluviographic regimes
Vesna Ristić Vakanjac, Veljko Marinović, Nikola Milovanović, Marina Čokorilo Ilić, Boris Vakanjac, Jugoslav Nikolić, Saša Bakrač (2022)We are witnessing climate change that is happening both, globally and, at the regionally - or local level. As a result of expected climate change in Southeast Europe, in the first place are the distributions of precipitation within the year (frequent extreme events are present) and then the increase in temperature, which already has a significant impact on evapotranspiration and runoff formed in a particular catchment area. In addition to climatic factors, the geological structure, i.e. the hydrogeological characteristics ...Vesna Ristić Vakanjac, Veljko Marinović, Nikola Milovanović, Marina Čokorilo Ilić, Boris Vakanjac, Jugoslav Nikolić, Saša Bakrač. "Influence of geological substrate on runoff formation, a case study: small river catchments in southeastern Serbia of similar size and with comparable pluviographic regimes" in XXII International Congress of the Carpathian Balkan Geological Association (CBGA), Sofia : Bulgarian Academy of Sciences (2022)
-
Punctuated, episodic magmatism and mineralization of the Rogozna skarn-hosted Au-Zn-Pb-Cu deposits revealed through high-precision U-Pb zircon geochronology
The subvolcanic regions of magmatic centers are commonly associated with alteration, mineralization, and economic ore deposits, however the duration and frequency of mineralizing pulses within the overall lifespan of these centers can be poorly defined. Therefore, models for the formation of mineral systems require more highprecision geochronology data to refine their evolutionary models. Rogozna Mountain and its eponymous magmatic complex, located in SW Serbia, hosts multiple base metal deposits associated with variable rock types and structural expressions and serves as a natural laboratory to ...Skarnovska mineralizacija, Magmatsko-hidrothermalni sistemi, Subvulcanske intruzije, geohronologija na cirkonima, CA-ID-TIMSSean P. Gaynor, Milorad D. Antić, Vladica Cvetković, Kristina Šarić, Urs Schaltegger. "Punctuated, episodic magmatism and mineralization of the Rogozna skarn-hosted Au-Zn-Pb-Cu deposits revealed through high-precision U-Pb zircon geochronology" in Ore Geology Reviews, Elsevier (2023). https://doi.org/https://doi.org/10.1016/j.oregeorev.2023.105775