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Упит dcterms_subject_txt:debris flow

251 items

  • Избор одговарајуће механичке методе

    Анастасија Мирјанић (2024)
    Експлоатација нафте и гаса кључна је за задовољење глобалних енергетских потреба. Различите методе се користе за ефикасно вађење тих природних ресурса из земљe. Механичке методе експлоатације, које укључују различите врсте пумпи и компресора, играју значајну улогу у овом процесу. У нафтној индустрији, ефикасно вађење нафте и гаса зависи од избора одговарајуће технологије пумпања. Две од најраспрострањенијих технологија су дубинске пумпе са клипним шипкама (енгл. Sucker rod pumps- SRP) и електричне потапајуће пумпе (енгл. Electrical submersible pump- ESP). Овај завршни рад ће ...
    дубинске пумпе са клипним шипкама, замена, електрична потапајућа пумпа, производња, бушотина

  • 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)
    Renewable Energy, Sustainability and the Environment
    ... cultivation on the area bigger than 5 ha. Milanovi} et al. [5, 6] develop geothermal heating systems for Smederevska Palanka 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 ...
    ... cultivation on the area bigger than 5 ha. Milanovic et al. [5, 6] develop geothermal heating systems for Smederevska Palanka 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 ...

  • Hidrogeološke karakteristike područja Cerničkog polja (Istočna Hercegovina) sa posebnim osvrtom na rizik od zagađena podzemnih vodnih resursa

    Petar Vojnović (2023)
    ... Sekcija: Voda (V) V-1. Milica Svetozarević, Nataša Šekuljica, Ana Dajić, Marina Mihajlović, Zorica Knežević- Jugović, Dušan Mijin: Continuous flow for degradation of dyes. Value added utilization of potato peel V-2. Aleksandar Jovanović, Mladen Bugarčić, Nataša Knežević, Miroslav Sokić, Vladimir ...

  • BEYOND 2020 - Geology explorations and open pit activities affectation in reclamation designing in Kolubara Coal Mines (KCM) Serbia, new considerations

    Bojan Dimitrijević, Bogoljub Vučković, Radmila Gaćina (2023)
    Geology explorations in KCM runs from 1936. year up to these days and still ongoing. Results in >7,200 drill holes with ≈600,000 m of core drilling and gave lignite ore resources of > 4,1Bt, which 1,15Bt are excavated since 1986. of XIX up to early years of XXI century. For further mining operations in open pits stay 1,5Bt of lignite. Under waste heaps are ≈80 km2, additional 85 km2 should be filled. All of that masses/areas were, are ...

  • 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
    ... externally supplied heat K el Carbon dioxide emission coefficient of electricity Q̇ w Recoverable heat power-treated sewage wastewater ṁ Mass flow of treated wastewater t Temperature difference of treated wastewater at entrance and exit of heat exchanger–evaporator Q̇ h Thermal power of heat ...
    ... comprises 85% of the total amount of persons daily water demand (Hepbasli et al. 2014). Sewage wastewater is characterized by a small vari- ation of flow rate and temperature over the year (Meggers and Leibundgut 2011). Due to the high heat capacity and density, wastewater is considered as a suitable ...
    ... treated wastewater—technical potential is determined as: where Q̇ w [kW] Recoverable heat power-treated sewage wastewater, ṁ [ kg s ] Mass flow of treated wastewater, c [ kJ kgK ] Specific thermal capacity of treated wastewater, t[K] -Temperature difference of treated wastewater at ...

  • Opremanje bušotine X zavojnom pumpom

    Milan Filipović (2024)
    Ovaj rad se bavi osnovnim pojmovima i karakteristikama zavojnih pumpi.Prikazan je sklop zavojnih pumpi i njena prateća oprema. Objašnjen je princip rada zavojnih pumpi kao i uloga svakog mašinskog elementa koji se nalazi u pumpi. Razmotrene su prednosti i nedostaci primene ovih primarnih mehaničkih metoda eksploatacije ugljovodonika. Dat je uvid u inovativna rešenja problematike primene zavojnih pumpi. Na konkretnom primeru bušotine X su prikazani problemi kao i rešenja primene ovih primarnih mehaničkih metoda u praksi. Napravljena je detaljna analiza ...
    zavojne pumpe, oprema, primarne mehaničke metode, ugljovodonici, analiza rada
    ... kroz slobodni prostor do površine dok se nafta kreće kroz tubing. (Zelić. 2006, Liang & Kadri, 2018) Pump Separator openings G as Annular flow zone Oi Outer barrel Dip tube Slika 7 Separator gasa (UPC, 2021) Transformator Je uređaj čija Je uloga promena napona u sistemu. Funkcioniše ...
    ... zaštite opreme i lakše proizvodnje fluida. Na slici 12 je prikazan konačni model bušotine X sa pratećom opremom: 1 ) SURFACE EQUII Sk __J Tubing flow from Perforacija Tubing Pk Perforacija 805 m ___ - 807m — Casing 810m — Slika 12 Model bušotine X Iz priložene slike se zelenim strelicama ...
    ... net/new- progressive-cavity-pump-design-makes-maintenance-a-breeze • Zhu,J. & Zhang H.Q. (2018). "A Review of Experiments and Modeling of Gas&Liquid Flow in Electrical Submersible Pumps", project: Mechanistic modeling in Electrical Submersible Pumps (ESP) Soleša, M., Danilović, D., Buza, Z. (1999) ...

  • The ‘Umka’ landslide

    Uroš Đurić, Dragana Đurić, Miloš Marjanović, Biljana Abolmasov, Ivana Vasiljević (2024)
    We present an in-depth landslide map of the ‘Umka’ landslide near Belgrade, Serbia, at a scale of 1:5000. The map delineates elements at risk, primarily buildings and road infrastructure impacted by the landslide displacements of several cm per year, introduced during frequent reactivation stages. The Main map results from a survey of over 350 buildings and more than 7 km of state and local roads. The acquisition techniques included engineering geological field mapping, building survey, and visual interpretation of ...
    rizik od klizišta, elementi rizika, kartiranje pomoću drona, ispitivanje objekata, geotehnički monitoring

  • Kvantitativna ocena režima i bilansa podzemnih voda u aluvijonu Velike Morave od Bagrdana do ušća u Dunavu

    Aleksandar Balubdžić (2024)
    Aluvijalni sedimenti velikih reka raspolažu značajnim količinama podzemnih voda, što je zajedno sa površinskim vodama dozvolilo razvoj naselja i ljudskih aktivnosti. Ovaj razvoj uslovljava veće potrebe za vodnim resursima i njihovim kvalitetom. Sa povećanjem eksploatacije podzemnih voda, uticaj iste je značajniji i može da dovede do opadanja nivoa podzemnih voda i pogoršanja kvaliteta. Aluvijon Velike Morave ima značajno rasprostranjenje, usled čega predstavlja važno ležište izdanskih voda sa velikim eksploatacionim mogućnostima. Izradom hidrodinamičkog modela aluvijona Velike Morave od Bagrdana do ...
    režim podzemnih voda, bilans podzemnih voda, intergranularna izdan, hidrodinamički model
    ... aeaeaeaeaaaaaaaeaeaaatatoteaeaaetaktaet 28 6.3.1. Granični uslov „reka“ (eng. ,, riyer “) 6.3.2. Granični uslovi sa zadatim proticajem - bunari i „no flow" al 29 6.3.3. Granični uslov efektivna infiltracija...aaaaaaaaaaaaa n aeneaaoanaataci 31 6.3.4. Granični uslov generalnog nivoa na granici (eng ...
    ... stanice Kota vodostaja (mnm) Bagrdan Žabarski most Ljubičevski most Smederevo (ušće) 6.3.2. Granični uslovi sa zadatim proticajem - bunari i „no flow“ Uticaj eksploatacionih bunara na izvorištima, koji se nalaze na području i eksploatišu podzemne vode iz slojeva aluvijona reke Velike Morave, simuliran ...
    ... sastavu predstavljeni slabije propusnim sedimentima i stenama, su simulirani graničnim uslovom zadatog proticaja kao polja bez proticaja (eng. „J10 flow*). 30 6.3.3. Granični uslov efektivna infiltracija U proračunu ukupnog bilansa podzemnih voda, bitnu ulogu ima efektivna, rezultantna infiltracija ...

  • The Importance of Detailed Groundwater Monitoring for Underground Structure in Karst (Case Study: HPP Pirot, Southeastern Serbia)

    Marina Čokorilo Ilić, Ana Mladenović, Marina Ćuk, Igor Jemcov (2019)
    Geography, Planning and Development,Aquatic Science,Biochemistry,Water Science and Technology
    ... ; Special Paper no. 1; National Cave and Karst Research Institute: Carlsbad, CA, USA, 2007; 106p. 4. Zhang, L.; Franklin, J.A. Prediction of Water Flow into RockTunnels: An Analytical Solution Assuming a Hydraulic Conductivity Gradient. Int. J. Rock Mec. Min. Sci. Geomech. Abstr. 1993, 30, 37–46. ...
    ... Geol. 2011, 121, 46–54. [CrossRef] 6. Najafi, M.R.; Nabipour, M. The effect of step on the hydraulic characteristics of the subcritical free surface flow in conveyance tunnel. Tunn. Undergr. Space Technol. 2012, 28, 212–217. [CrossRef] 7. Hassani, A.N.; Katibeh, H.; Farhadian, H. Numerical analysis of ...

  • Design of a sucker rod pumping system

    Ana Ponoćko (2024)
    For a long time in the history of oil production, sucker rod pumps have been the first and in many cases the only choice when it comes to mechanical extraction methods. Proper selection of each individual element of the system enables optimization, which entails benefits in the form of increased efficiency and reduced costs. The first part of the paper presents the underground and surface equipment of the rod pump and describes the operation of the entire system. The ...
    sucker rod pump, fluid production, mechanical extraction methods,, Prosper, QROD, RODSTAR
    ... is called an eruptive method. When the reservoir energy is sufficiently depleted, so that the reservoir pressure is no longer enough to enable the flow of fluid through the well, pipeline, and surface equipment, when production has reached a minimum economically viable value additional energy must ...
    ... the standing and traveling valves and compresses the fluid inside the cylinder, resulting in an increase in pressure within the pump. The reverse flow and pressure increase force the standing valve to close, and the compression cycle continues until the pressure within the cylinder exceeds the ...
    ... apply to the traveling valve. The dimensions and configuration of the internal diameter of the valve body should ensure adequate clearance and fluid flow with minimal pressure drop. The API specification pertains only to the dimensions and not to the materials of the component. The ball and seating ...

  • Centar za hidrogeologiju karsta - 15 godina nauke i struke

    urednici Saša Milanović, Ljiljana Vasić, Zoran Stevanović, Branislav Petrović (2023)
    Centar za hidrogeologiju karsta
    ... impeller) for flow measurement type SEBA (Seba Hydrometrie Z6) for quantities from a few tens to several thousand 1/s. Recently, the CKH has been practicing the installation of digital flow meters (the Stingray flow meter) as a reliable and very precise procedure with a step of flow measurement of ...
    ... calculations, simulations and predictions of karst spring flow, application of hydrological models in karst, statistical methods in hydrogeology, regression and correlation analyses in karst hydrogeology, analyses of karst spring flow regime and balance of groundwater n karst terrains. Also, the ...
    ... obrazovanja bio je Univerzitet u Beogradu i njegovi fakulteti, Predmeti iz hidrogeologije sa objašnjenjima osnovnih elemenata hidrogeologije 4 flow out' as well as the first inventory and classification of springs are also part of these studies. After returning to Serbia, he was appointed professor ...

  • Analiza softvera za projektovanje ESP sistema

    Aleksandar Sredojević (2024)
    U momentu kada pritisak na dnu bušotine nije dovoljan da savlada ukupne gubitke pritisaka od dna bušotine do separatora, proizvodnja pomoću ležišne energije nije više moguća i bušotina prestaje sa eruptivnim radom. Kako bi ponovo omogućili proizvodnju fluida iz bušotine, potrebno je primeniti neke od mehaničkih metoda eksploatacije. Najprimenljivije mehaničke metode eksploatacije su: gas lift (GL), dubinske pumpe sa klipnim šipkama (SRP), električne uronjene centrifugalne pumpe (ESP), zavojne pumpe (PCP) i hidraulične pumpe (HP). Jadna od tih metoda koja ...
    električna centrifugalna pumpa (ESP), proizvodnja fluida, mehaničke metode eksploatacije, Prosper, Pipesim
    ... |Liquidflowrate + Well survey data: FLUID RATIOS lnflow (GOR Watercut “ sma/sm3____-|% ı |Cpi 6. 7 FLOW CORRELATIONS Swap angle: F3 deg __ Vertical flow (multiphase) __ Horizontal flow (multiphase) Baker Jardine Revised Selected [} i Aziz Govier Fogarasi |in] 2 |Beggs a Bril [Tulsa (Legacy ...
    ... u bušotini zbog odsustva bilo kakve razlike pritisaka. 3. Maksimalna brzina protoka, qomax, ili apsolutni otvoreni protok, AOF (absolute open flow), odgovara pritisaku u bušotini koji je Jednak nuli. lako u praksi ovo možda nije uslov pri kojem bušotina može da proizvodi, ovo je korisna definicija ...
    ... systems for artificial lift“; Bultur _ R., Duran, J., Prado, M. & Pessoa R., (2003). „Analysis of Experimental Data of ESP Performance Under Two-Phase Flow Conditions“, SPE Production and Operations Symposium, Oklahoma City, Oklahoma, USA, 22-25 March; Carrillo William, (2013). „Prognostics for Oil ...

  • Novi model za postizanje optimalne proizvodnje na naftnom polju Amal

    Elnori Elmabrouk Ali Elhaddad (2015-04-16)
    Doktorskom disertacijom analizirani su i proučavani problemi proizvodnje nafte iprimenjene metode za njihovo rešavanje na naftnom polju Amal. Ukratko jeprikazana proizvodnje nafte u Libiji, njene karakteristike i rezerve, da bi se videoznačaj ovog naftnog polja.Utvrđeno je da su na naftnom polju Amal ključni problemi koji prate procesproizvodnje taloženje parafina, pojava slojnog peska, neefikasan rad gasliftsistema, neefikasna desalinizacija nafte i ekološki problemi. Proizvodniproblemi, pojedinačno i više njih zajedno, na nekim bušotinama uzrokovali susmanjenje proizvodnje nafte od 40 do 75%. Zbog ...
    nafta, proizvodnja, optimizacija, Amal, Libija
    ... A., Dhurjati Prasad C., Angelus P., Sastry M.K.S., (2013) Wax formation in oil pipelines: A critical review, International Journal of Multiphase Flow, 37, 671– 694. 85 Ariweriokuma, S. (2008), Political Economy of Oil and Gas in Africa, the Routledge Studies in International Business and ...
    ... Developments in Petroleum Science, Volume 26, 1989, Pages 699-842. Guerrero-Sarabia I., Fairuzov Y.V. (2013) Linear and non-linear analysis of flow instability in gas lift wells, Journal of Petroleum Science and Engineering, In Press, Accepted Manuscript. Guo B., Lyons W.C., Ghalambor A., ...
    ... Hallibarton, (2012a), Gravel. 90 Hamouda A. A., Davidsen S. (1995) An Approach for Simulation of Paraffin Deposition in Pipelines as a Function of Flow Characteristics with a Reference to Teeside Oil Pipeline, SPE 28966, and Paper presented at the 1995 SPE International Symposium on Oilfield Chemistry ...

  • Novi model za postizanje optimalne proizvodnje na naftnom polju Amal

    Elnori Elmabrouk Ali Elhaddad (2015-04-16)
    Doktorskom disertacijom analizirani su i proučavani problemi proizvodnje nafte iprimenjene metode za njihovo rešavanje na naftnom polju Amal. Ukratko jeprikazana proizvodnje nafte u Libiji, njene karakteristike i rezerve, da bi se videoznačaj ovog naftnog polja.Utvrđeno je da su na naftnom polju Amal ključni problemi koji prate procesproizvodnje taloženje parafina, pojava slojnog peska, neefikasan rad gasliftsistema, neefikasna desalinizacija nafte i ekološki problemi. Proizvodniproblemi, pojedinačno i više njih zajedno, na nekim bušotinama uzrokovali susmanjenje proizvodnje nafte od 40 do 75%. Zbog ...
    nafta, proizvodnja, optimizacija, Amal, Libija
    ... A., Dhurjati Prasad C., Angelus P., Sastry M.K.S., (2013) Wax formation in oil pipelines: A critical review, International Journal of Multiphase Flow, 37, 671– 694. 85 Ariweriokuma, S. (2008), Political Economy of Oil and Gas in Africa, the Routledge Studies in International Business and ...
    ... Developments in Petroleum Science, Volume 26, 1989, Pages 699-842. Guerrero-Sarabia I., Fairuzov Y.V. (2013) Linear and non-linear analysis of flow instability in gas lift wells, Journal of Petroleum Science and Engineering, In Press, Accepted Manuscript. Guo B., Lyons W.C., Ghalambor A., ...
    ... Hallibarton, (2012a), Gravel. 90 Hamouda A. A., Davidsen S. (1995) An Approach for Simulation of Paraffin Deposition in Pipelines as a Function of Flow Characteristics with a Reference to Teeside Oil Pipeline, SPE 28966, and Paper presented at the 1995 SPE International Symposium on Oilfield Chemistry ...

  • Assessments of effects of implementation of strategic plans for development of Belgrade District heating system

    Dejan Ivezić, Marija Živković, Aleksandar Madžarević, Miodrag Grujić (2020)
    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 ...
    Daljinsko grejanje, LEAP, Primarni energetski faktor, Uvozna zavisnost, CO2 emisija

  • Ostvarivanje dobiti pri uvođenju sistema agregatnih zamena na osnovnoj rudarskoj mehanizaciji površinskih kopova EPS

    Predrag Jovančić, Ignjatović Dragan, Đenadić Stevan (2021)
    Jedan od osnovnih zadataka na površinskim kopovima uglja je ostvarivanje zadovoljavajućeg vremenskog i kapacitetnog iskorišćenja kontinualnih sistema. Da bi se to postiglo, neophodno je izvršiti izmene u postojećoj strategiji održavanja. Preduslov je uvođenje agregatne zamene vitalnih delova na rudarskim mašinama. Benefiti su višestruki. Očekivani rezultati ovakvog pristupa su: smanjenje zastoja i povećanje vremena rada; direktne materijalne uštede; bolja organizacija rada; racionalizaciju radioničkih i magacinskih kapaciteta; povećanje vrednosti mašina. Da bi se uvela agregatna zamena neophodne su investicije za nabavku ...
    agregatne zamene, održavanje, mehanizacija, Benefit Cost analiza

  • Merenje pritiska u bušotinskom cevovodu

    Ratko Matija (2024)
    Merenje pritiska ima veliki značaj u naftovodima i gasovodima. U ovom završnom radu analizirane su različite metode merenja pritiska , kao što su merenje pritiska manometrima sa tečnostima, kapacitivnim manometrima, električnim manometrima nekim drugim. Objašnjena je kalibracija senzora pritiska koja u velikoj meri utiče na tačnost merenja. Navedeni su i objašnjeni elementi cevovoda i u vezi s tim pad pritiska, čije je merenje tema ovog završnog rada.
    merenje pritiska, manometri, kalibracija, elementi cevovoda, pad pritiska
    ... [1] Izdavač društvo fizičara Srbije, (2011). Mladi fizičar - kolekcija časopisa "Mladi fizičar" u elektronskom obliku. [2] Baker, R. C (2000).Flow measurement handbook: industrial designs, operating principles, performance, and applications. Cambridge University Press. [3] Prodanović, D ...
    ... [5] Snežana S. Aleksandrović, (). Prezentacije iz Metrologije i standardizacije [6] Benedict, R.P. (1969). Fundamentals of Temperature, Pressure and Flow Measurements. John Wiley & Sons. New York. [7] Dragan Stanković, (1990). Fizičko-tehnička merenja, Naučna knjiga. [8] Snežana S. Aleksandrović ...

  • 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)
    Polimeri i plastika, opšta hemija
    ... error of measurement, particularly when analysis is carried-out in non-isothermal mode [46]. Nitrogen was used as the purge gas with the flow rate of 60 cm3/min. The flow rate of nitrogen was chosen to optimize the analysis of gases. Fourier transform infrared spectroscopy (FTIR) was applied for qualitative ...
    ... while the other was connected to a trap (cooled to 0 ◦C), filled with 20 cm3 of chloroform, to which the pyrolysis products were transferred by the N2 flow. Liquid products were collected in cold trap, whereas released gases could not be collected. The sample (1 g) was situated in the quartz vessel and ...
    ... by GC–MS technique, using an Agilent 7890A Gas Chromatograph (HP-5MS column, 30 m × 0.25 mm, 0.25 µm film thickness, carrier gas—helium with constant flow of 1.5 cm3/min), coupled to an Agilent 5975C Mass Selective Detector (Agilent Technologies, Santa Clara, CA, USA) (electron ionization energy of 70 ...

  • 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 ...
    Carbon Capture, Utilization and Storage
    ... the CO2 flow. This exergy expenditure decreases as the process occurs, and the exergy gained is lower than the exergy expended because of the irreversibility of the equipment. In the numerator, the first two terms represent the exergy entering and leaving the system with a certain flow rate (n') ...
    ... stages of CO2- based clathrate desalination is estimated to be 3.17 USD Kgal!. (I gal=3.8L) [13]. Figure 3.2 shows a simplified desalination process flow diagram. First, the Mg?* and Ca** ions from desalination wastewater are separated via the pH swing method; thereafter, sodium hydroxide (NaOH) obtained ...
    ... requires pipelines to be made of alloy or steel to prevent leakage of CO- and can be over long distances [85]. Pipelines may have booster stations drive flow through pipelines over long distances. CO» pipeline costs also depend on the distance and quantity transported. CO in liquid state can be transported ...

  • Optimising in electrical energy consumption in mining plants

    Snežana Aleksandrović, Vesna Damnjanović, Ilija Jeftenić (2018)