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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">tumnig</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Нефть и газ</journal-title><trans-title-group xml:lang="en"><trans-title>Oil and Gas Studies</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0445-0108</issn><issn pub-type="epub">3033-8174</issn><publisher><publisher-name>Industrial University of Tyumen</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.31660/0445-0108-2025-3-9-30</article-id><article-id custom-type="edn" pub-id-type="custom">LRTOID</article-id><article-id custom-type="elpub" pub-id-type="custom">tumnig-1320</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ГЕОЛОГИЯ, ПОИСКИ И РАЗВЕДКА МЕСТОРОЖДЕНИЙ НЕФТИ И ГАЗА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>GEOLOGY, PROSPECTING AND EXPLORATION OF OIL AND GAS FIELDS</subject></subj-group></article-categories><title-group><article-title>Исследование условий работы естественного термогазлифта в стволе скважины</article-title><trans-title-group xml:lang="en"><trans-title>Study of natural thermogaslift operating conditions in the wellbore</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5983-4040</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Катанов</surname><given-names>Ю. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Katanov</surname><given-names>Yu. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Катанов Юрий Евгеньевич, кандидат геолого-минералогических наук, доцент кафедры интеллектуальных систем и технологий, Высшая школа цифровых технологий</p><p>Тюмень</p></bio><bio xml:lang="en"><p>Yuri E. Katanov, Candidate of Geology and Mineralogy, Associate Professor at the Department of Intelligent Systems and Technologies, Higher School of Digital Technologies</p><p>Tyumen</p></bio><email xlink:type="simple">katanov-juri@rambler.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Тюменский индустриальный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Industrial University of Tyumen</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>08</day><month>07</month><year>2025</year></pub-date><volume>0</volume><issue>3</issue><fpage>9</fpage><lpage>30</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Катанов Ю.Е., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Катанов Ю.Е.</copyright-holder><copyright-holder xml:lang="en">Katanov Y.E.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://tumnig.tyuiu.ru/jour/article/view/1320">https://tumnig.tyuiu.ru/jour/article/view/1320</self-uri><abstract><p>Представлены методические подходы к исследованию влияния температуры и газосодержания на изменение давления в скважине при определении соответствующей глубины разгазирования нефти. Рассмотрен вопрос точности учета переменного притока при исследовании нефтяных скважин на неустановившихся режимах фильтрации.</p><p>Цель работы — получение модели принятия решений при оценке изменения давления по стволу скважины относительно устьевой или забойной депрессии; расчете влияния естественного термогазлифта на переход скважин при фонтанировании; оценке точности в определении отобранного из ствола или, наоборот, накопленного в нем некоторого дополнительного объема жидкости за время исследования скважин на неустановившихся режимах фильтрации, и т. п.</p><p>Выявлено время запаздывания выделения газа в потоке пластовой жидкости. Для месторождений Башкирии время запаздывания (по промысловым данным) составляет 4–15 минут. Для Западной Сибири аналогичные исследования, как правило, не проводятся, что влияет на точность геолого-промысловых расчетов. Если устьевое давление ниже давления насыщения, то с соответствующей глубины растворенный в нефти газ начинает выделяться в свободную газовую фазу по стволу скважины. Объем газовой фазы вверх по стволу будет непрерывно возрастать и на устье достигнет своего максимального значения. С другой стороны, поскольку весовой расход останется постоянным независимо от того, началось выделение газа или нет, то в дальнейшем будет происходить изменение температуры за счет дросселирования и адиабатического расширения газа по стволу скважины и поглощения скрытой теплоты парообразования при его испарении из газожидкостной смеси в условиях теплообмена с окружающей средой.</p></abstract><trans-abstract xml:lang="en"><p>This paper presents methodological approaches to study the influence of temperature and gas content on pressure variations within a well, with the goal of identifying the depth at which oil degassing occurs. The study also examines the accuracy of accounting for variable inflow under non-steady filtration conditions during well testing.</p><p>The goal is to develop a decision-making model for evaluating pressure changes along the wellbore relative to either wellhead or bottomhole drawdown.</p><p>Additionally, the model aims to estimate the role of natural thermogaslift in facilitating flow during natural well production and to accurately determine the volume of fluid withdrawn from the wellbore or accumulated within it over time under non-steady flow conditions.</p><p>We identified the lag time of gas liberation from the reservoir fluid. We identified the lag time of gas liberation from the reservoir fluid. Based on field data, this gas release delay in Bashkirian fields ranges from 4 to 15 minutes. In contrast, similar studies are generally not done in Western Siberia, and this affects the accuracy of reservoir and production modelling. When the wellhead pressure drops below the oil saturation pressure, dissolved gas starts to separate and transitions into the free gas phase from a specific depth upward along the wellbore. The volume of free gas increases continuously as it moves toward the wellhead, reaching its maximum at the surface. At the same time, since the mass flow rate remains constant regardless of gas release, temperature changes occur further along the wellbore due to gas throttling, adiabatic expansion, and the absorption of latent heat of vaporization as gas evolves from the gas-liquid mixture in thermal exchange with the surrounding reservoir.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>давление</kwd><kwd>жидкость</kwd><kwd>скважина</kwd><kwd>температура</kwd><kwd>модель</kwd><kwd>труба</kwd><kwd>муфта</kwd><kwd>фильтрация</kwd></kwd-group><kwd-group xml:lang="en"><kwd>pressure</kwd><kwd>fluid</kwd><kwd>wellbore</kwd><kwd>temperature</kwd><kwd>model</kwd><kwd>tubing</kwd><kwd>coupling</kwd><kwd>filtration</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Орешкин, И. В. Обоснование критериев прогноза фазового состояния пластовых углеводородных смесей / И. В. Орешкин, Е. В. 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