Претрага

Упит dcterms_subject_txt:well

14 items

  • Mitigating hydrate formation in onshore gas wells: A case study on optimization techniques and prevention

    Milica Ješić, Bojan Martinović, Stefan Stančić, Miroslav Crnogorac, Dušan Danilović (2023)
    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 Injection

  • Design and drilling of wells in formations with high pressure

    Vojin Solomun (2024)
    Objectives of this Thesis are to: - Develop an awareness of the challenges presented from elevated temperatures and pressures in well construction. - Learn the key differences between ―normal‖ condition wells and HPHT wells. - Understand some of the indicators of thermal- and pressure-related problems. - Understand the responses which may be made to mitigate high pressure and high temperature ,,HPHT‘‘ challenges while drilling wells. HPHT wells are an unavoidable consequence of the ever expanding search for oil and gas resources around the world. As wells are ...
    HPHT, well, challenges, design, oil and gas
    ... 73 8. WELL CONTROL Successful HPHT Well Control consists of: HPHT challenges; Primary Well Control - PPEG, managing the well, swab & surge, ECD & ESD, fracture charging; Secondary well control - kick detection and response, kick control procedures, phase behavior; Tertiary Well Control - ...
    ... drilling the well and defined in the WCPP. A specific decision tree should be made for the well to cover the alternative well control methods and at what point the well is shut-in to re-evaluate the situation. Criteria for the decision to abandon the well must be established as part of the well control ...
    ... assessment of well integrity risks associated with the intended operation shall be performed. The risk of a well integrity failure or well control incident shall be assessed. When evaluating well integrity risk, the failure modes of the primary barriers and the availability of secondary well barriers ...

  • Analysis and visualization of geophysical well-logging data from closely spaced boreholes

    Branislav Sretković, Ivana Vasiljević, Dimitry Sidorov - Biryukov (2024)
    Geophysical logging measurements for determining the condition of the rock mass on the dam profile and locating the predisposed directions of water circulation and loss from the reservoir were conducted in four boreholes distributed at a close distance. The survey was carried out in a typical karst terrain, which is an additional challenge for defining the geological model, especially in terms of water retention. That kind of data set provides an excellent opportunity for a new approach to analysis ...
    well-logging in karst, water loss, data correlation, data fusion
    ... visualization of geophysical well-logging data from closely spaced boreholes Branislav Sretković, Ivana Vasiljević, Dimitry Sidorov - Biryukov Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Analysis and visualization of geophysical well-logging data from closely ...
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs TToceéno u30anue na Geologica Macedonica, N0.6 MAKE OHCKO ...
    ... econosaare Ha PenyOnka CeBepHa MakcJuoHuja Fifth Congress of Geologists of the Republic of North Macedonia ANALYSIS AND VISUALIZATION OF GEOPHYSICAL WELL- LOGGING DATA FROM CLOSELY SPACED BOREHOLES IBranislav Sretković, !'Iyvana Vasiljević, IDimitry Sidorov - Biryukov 1University of Belgrade - Faculty ...

  • Application of machine learning for diagnosing the operation of a deep well pump in oil production

    Maja Trikić (2024)
    This paper will thoroughly examine how machine learning can improve the diagnosis of deep well pumps by analyzing the role and function of the pumps, dynamograms, sensor technologies, and diagnostic methods.Our analysis will provide insights into modern techniques and approaches for enhancing the performance and reliability of oil production systems, targeting cost reduction and increased operational efficiency.
    deep well pump, dynamograms, machine learning, diagnostics of operating coditions,Random Forest, XGBoost
    ... technology. 2. ROLE AND FUNCTION OF DEEP WELL PUMPS IN OIL PRODUCTION 2.1 Overview of deep well pumping systems In practical applications, oil production is most commonly achieved through deep well pumping using rod pumps. Figure 2.1 illustrates a deep well pumping system that includes both surface ...
    ... system for diagnosing well behavior in deep well pumping, the following elements are required: l. A database of dynamogram shapes for typical problems in deep well pumping systems, generated from the analysis and classification of recorded dynamograms from fields in Serbia, as well as from published ...
    ... KEYWORDS:deep well pump, dynamograms,machine learning,diagnostics of operating coditions,Random Forest, XGBoost. CONTENTS 1. INTRODUCTION ... a aaaaaaeaa a aaa a aaaaaaaaaaakakaoi 1 2. ROLE AND FUNCTION OF DEEP WELL PUMPS IN OIL PRODUCTION......... 3 2.1 Overview of deep well pumping systems ...

  • Gas-lift wells optimization at the oil field "K"

    Dušan Danilović, Marija Ilić, Miroslav Crnogorac, Lola Tomić (2022)
    naftna bušotina, raspodela gasa, gas-lift, optimizacija

  • Razvoj modela upravljanja cirkulacijom u postupku bušenja korišćenjem neuro fazi sistema zaključivanja

    Seyed Ali S. Razeghi (2022)
    Gubitak isplake predstavlja nekontrolisano isticanje bušaćeg fluida kroz formacije kao što su kaverne, pukotine, ili drugi slojevi. Tradicionalne metode procene gubitka isplake se zasnivaju na primeni seizmičkih podataka ili pronalasku „mesta“ gubitka isplake na osnovu raspoloživih podataka iz susednih bušotina. Međutim, ove metode procene nisu pouzdane.‘ U disertaciji je izvršena analiza i procena uticaja parametara bušenja, geoloških faktora, karakteristika formacije i fluida na gubitak isplake kao i na formiranje fraktura u formacijama. Uspostavljeni su modeli koji podrazumevaju proces obrade ...
    naftna bušotina, gubitak isplake, fuzzy logika, ANFIS model

  • Development and evaluation of fracture gradient curve model: a case study of south-central Kazakhstan

    Branimir Stanisavljevic, Vesna Karovic Maricic, Irena Isakov (2022)
    An accurate fracture gradient value is one of the most important issues in oil and gas well design and drilling. The value of a fracture gradient is a critical parameter for determining the drilling mud weight and selecting the proper depths for setting the casing in the planning process of drilling operations. This paper proposed the new curve model of fracture gradient for the south-central Kazakhstan (central Asia) region based on the analysis of leak-off test and format integrity ...
    gradijet frakturiranja, model nove krive, projektovanje naftne bušotine, Kazahstan

  • Uticaj utiskivanja gas-lift gasa na prenos mase i toplote

    Branko Grubač (2019)
    Nakon uvođenja kontinualnog gas-lifta, primećen je porast proizvodnje tečnog naftnog gasa, TNG, u postrojenju za preradu gasa, kao jednog od finalnih proizvoda dobijenog iz fluida gaso kondenzatnih i rastvorenog gasa iz naftnih bušotina. Pretpostavljeno je da se prisustvom gas-lift gasa uspostavlja drugačija ravnoteža faza u odnosu na slučaj bez gaslifta, te da je gas-lift gas stripovao propan i butane iz tečne u parnu fazu, što je dovelo do povećanja prinosa TNG-a. Napravljen je model bušotine koja radi u kontinualnom gas-liftu ...
    gas-lift, modelovanje bušotine, prenos mase i toplote, taloženje parafina
    ... research have shown that the precipitation of paraffins begins at greater depths and that the amount of deposit is higher in the gas-lift well. Key words: gas-lift, well modeling, mass and heat transfer, paraffin deposition Scientific area: Mining engineering Scientific subfield: Elements of mechanical ...
    ... Texas, str 1-38, (2007) [6] J. Lea, H. Nickens, M Wells, Gas well deliquification, Second Edition, Gulf professional publishing, Elsevier, Burlington, str 331-352, (2008) [7] A. Hernandez, Fundamentals of gas-lift engineering, Well design and troubleshooting, Elsevier, Cambridge, str 81-106, ...
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs UNIVERZITET U BEOGRADU RUDARSKO-GEOLOŠKI FAKULTET ...

  • Convective heat transfer in centrifugal pumps lifted wells: the case of South-Eastern Europe waxy wells

    Bojan Martinovic, Marija Živković, Branko Grubač (2021)
    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 ...
    prenos toplote konvekcijom, ESP pumpa, svojstva fluida, problemi u radu bušotine

  • 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
    ... as  reservoirs of  the “Mokrin”  field  represent  individual sandstone  layers. The correlation  is based on similarity  in the shape of well‐log curves, well  data and chronostratigraphic classification, disregarding depositional environments where hydrocarbon‐ bearing  layers occurred. Due to  i ...
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs 17. Конгрес геолога Србије  17th Serbian Geological Congress  ...
    ... а‐Мокрин (KMH), (Ivanišević  Radivojević, 2018).  Figure  1.  a)  Interpreted  seismic  profile with  lithostratigraphic  units  (formations).  b) Well‐log  data  correlation within Upper  Miocene formations in the area of the “Kikinda‐Mokrin” high. Parallel presentation of the industrial correlation of A ...

  • Pregled hidrodinamičkih istraživanja bunara sa horizontalnim drenovima numeričkim metodama

    Đorđije Božović, Dušan Polomčić, Dragoljub Bajić (2020)
    U radu je predstavljen pregled odabranih hidrodinamičkih istraživanja realizovanih primenom numeričkih metoda simulacije kretanja podzemnih voda pod uticajem rada bunara sa horizontalnim drenovima. Na osnovu pristupa u matematičkom i hidrauličkom tretiranju, kao i numeričkoj simulaciji bunara sa horizontalnim drenovima na modelima, predstavljeni su najznačajniji aspekti izrade hidrodinamičkih modela ovog kompleksnog tipa vodozahvatnog objekta. Metodologija obuhvata izbor: a) graničnih uslova za simulaciju prirodnih granica, izvora prihranjivanja i dreniranja izdani; b) primenjivanog stepena diskretizacije prostora obuhvaćenog modelom u planu i profilu; ...
    horizontalni bunari, hidraulika bunara, analitički modeli, numerički modeli, hidrodinamičko modeliranje podzemnih voda

  • Application of Gel for Water Shutoff: A Case Study of Kelebija Oil Field

    Irina Zahirovic, Petar Skrobonja, Dušan Danilović (2022)
    This paper focuses on the results of water shutoff operations using DSGA polymer gel in the Kelebija oil field. The methodology of candidate wells selection and the manner of performing the operation will also be included. The Kelebija oil field is characterized by a complex reservoir system with heterogeneous layers of different permeability and dual porosity, which led to the early breakthrough of water. For the last 25 years, average water cut was above 90%. Implementation of water shutoff ...
    intervención de pozos petroleros, reservoir characterization, production control, well logging, downhole intervention, enhanced recovery, complex reservoir, reservoir surveillance, water shut-off, upstream oil & gas

  • Старење бунара у алувијалним срединама различитог степена оксичности

    Brankica Majkić (2013-09-27)
    Старење бунара настаје као последица процеса корозије и колмирања. Процесекорозије могуће је спречити уградњом филтерских конструкција од материјалаотпорних на корозију. Колмирање може да настане без обзира на врсту материјалаод кога се праве бунарске конструкције, а процесом може бити захваћенаприфилтарска зона па и зона саме водоносне средине. Из тог разлога тезa јеусмеренa на процесе који доводе до колмирања бунара и последицe опадањaкапацитета водозахватних објеката. Полазна хипотеза је да бунари стареразличитом брзином у срединама различитог степена оксичности. Хидрохемијскеи микробиолошке карактеристике подземних ...
    старење бунара, алувијалне издани, степен оксичности средине,колмирање, бунарски талог, локални хидраулички губитак, дозвољене улазнебрзине
    ... to construct the well casing and the process may extend to the immediate vicinity of the well screen and even affect the aquifer itself. For the above reason, focus of the thesis is on the processes that lead to well clogging and the impact of such processes on declining well capacity. The starting ...
    ... doctoral dissertation  WATER WELL AGEING IN ALLUVIAL SEDIMENTS OF DIFFERENT OXIC CONDITIONS SUMMARY Water well ageing is generally a consequence of corrosion and clogging. Corrosion can be prevented by installing well casings made from materials resistant to corrosion ...
    ... степена оксичности;Water well ageing in alluvial sediments of different oxic conditions Brankica Majkić Дигитални репозиторијум Рударско-геолошког факултета Универзитета у Београду [ДР РГФ] Старење бунара у алувијалним срединама различитог степена оксичности;Water well ageing in alluvial sediments ...

  • Mikroorganizmi - biohidrogeološki indikatori odabranih pojava mineralnih voda Srbije

    Vladimir Šaraba (2021)
    Sa namerom definisanja hidrogeološke uloge i značaja mikrobiološkog diverziteta odabranih pojava mineralnih voda Srbije, primenom sistema biodetektora, dokazano je prisustvo gvožđevitih, sulfato-redukujućih, sluz-produkujućih, heterotrofnih aerobnih i denitrifikacionih bakterija, na osnovu čega je proračunat rizik od razvoja procesa biokorozije i biohemijske inkrustacije, te zdravstveni rizik. Uz procenu rizika, izvedene su analize skenirajuće elektronske mikroskopije biofilmova i hidrogeohemijsko modeliranje, te makroskopska, otpička i difrakciona ispitivanja naslaga inkrustacije, dok je fizičko-hemijskim analizama utvrđena vrednost ukupne mineralizacije iznad 1 g/L, kao i povišeni ...
    biohidrogeologija, SEM analize, makroskopska i optička ispitivanja, rendgenska difrakcija praha, hidrogeohemijsko modeliranje, BART analize, metabarkoding analize mikrobioma, fizičko-hemijske analize, starenje bunara (biokorozija, biohemijska inkrustacija i biozarastanje), zdravstveni rizik
    ... y microbiology, 57(2), 243-249. Cullimore, D. R. (1999). Microbiology of well biofouling (Vol. 3). USA: CRC press. Cullimore, R. (2008). Determination of Plugging and Corrosion risks in water wells of all types, Water well rehabilitation workshop protocol 22608. Drycon Bioconcepts Inc., Saskatchewan ...
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs UNIVERZITET U BEOGRADU RUDARSKO - GEOLOŠKI FAKULTET ...
    ... sulphur bacteria, Methylotenera, Flavobacterium, Melioribacter and Dechloromonas. The research concludes that the respective microorganisms cause water well aging and define the ecological status of the water resources, while, on the other hand, some of the genera possess the biotechnological potential ...