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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">kaz29</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник Казахстанско-Британского технического университета</journal-title><trans-title-group xml:lang="en"><trans-title>Herald of the Kazakh-British Technical University</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1998-6688</issn><issn pub-type="epub">2959-8109</issn><publisher><publisher-name>Казахстанско-Британский Технический Университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.55452/1998-6688-2026-23-1-395-405</article-id><article-id custom-type="elpub" pub-id-type="custom">kaz29-2533</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>НЕФТЕГАЗОВАЯ ИНЖЕНЕРИЯ И ГЕОЛОГИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>OIL AND GAS ENGINEERING, GEOLOGY</subject></subj-group></article-categories><title-group><article-title>ЭФФЕКТИВНОСТЬ ОЧИСТКИ МИКРОПОР ПРИ ЗАВОДНЕНИИ ВЯЗКОУПРУГИМИ ПОЛИМЕРАМИ ДЛЯ ПОВЫШЕНИЯ НЕФТЕОТДАЧИ ПЛАСТОВ</article-title><trans-title-group xml:lang="en"><trans-title>EFFICIENCY OF MICROPORE SWEEP DURING VISCOELASTIC POLYMER FLOODING FOR ENHANCED OIL RECOVERY</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0006-4287-2714</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Омарова</surname><given-names>А. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Omarova</surname><given-names>A. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>магистрант</p><p>г. Алматы</p><p>г. Нанси</p></bio><bio xml:lang="en"><p>Master’s student</p><p>Almaty</p></bio><email xlink:type="simple">assemgulomarova@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2532-2642</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ыскак</surname><given-names>А. С.,</given-names></name><name name-style="western" xml:lang="en"><surname>Yskak</surname><given-names>A. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ассоциированный профессор</p><p>г. Алматы</p></bio><bio xml:lang="en"><p>Associate professor</p><p>Almaty</p></bio><email xlink:type="simple">yskakardak@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">КазНИТУ им. К.И. Сатпаева; Университет Лотарингии<country>Казахстан</country></aff><aff xml:lang="en">Satbayev University; University of Lorraine<country>Kazakhstan</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru">КазНИТУ им. К.И. Сатпаева<country>Казахстан</country></aff><aff xml:lang="en">Satbayev University<country>Kazakhstan</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>29</day><month>03</month><year>2026</year></pub-date><volume>23</volume><issue>1</issue><fpage>395</fpage><lpage>405</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Омарова А.О., Ыскак А.С., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Омарова А.О., Ыскак А.С.</copyright-holder><copyright-holder xml:lang="en">Omarova A.O., Yskak A.S.</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://vestnik.kbtu.edu.kz/jour/article/view/2533">https://vestnik.kbtu.edu.kz/jour/article/view/2533</self-uri><abstract><p>Полимерное заводнение широко применяется в качестве метода контроля подвижности для повышения нефтеотдачи пластов (EOR), однако часто сообщается о постепенном восстановлении после повышения подвижности, что остается неполным объяснением. В этом обзоре рассматривается роль вязкоупругости в повышении эффективности очистки микропор при заводнении полимеров. Проводится четкое различие между доступом к микропорам (проникновение потока в микродомены с низкой связностью) и мобилизацией микропор (высвобождение захваченного масла из тупиковых пор и углов). Анализ обобщает экспериментальные наблюдения, моделирование масштаба пор и реологические соображения, чтобы оценить, влияют ли упругие напряжения на дополнительные механизмы вытеснения нефти, помимо влияния сдвиговой вязкости. Особое внимание уделяется режиму течения при растяжении в условиях сходящейся и расходящейся геометрии пор, влиянию вязкости сырой нефти и роли солености, температуры и механического разрушения в подавлении вязкоупругих реакций. Обзор показывает, что влияние вязкоупругости на нефтеотдачу зависит от условий эксплуатации и наиболее выражено в пределах определенной вязкости и эксплуатационных периодов. Различия в представленных результатах в значительной степени объясняются несогласованностью реологических характеристик и недостаточным учетом последствий деградации. Для улучшения воспроизводимости и прогнозирования рекомендуется использовать стандартизированные реологические протоколы, основанные на кондиционировании рассола, включая, где это возможно, количественные показатели. Полученные результаты подчеркивают необходимость многомасштабной проверки, связывающей механизмы изменения масштаба пор со смещением керна и эксплуатационными характеристиками месторождения.</p></abstract><trans-abstract xml:lang="en"><p>Polymer flooding is widely implemented as a mobility-control method for enhanced oil recovery (EOR); however, incremental recovery beyond mobility improvement is frequently reported and remains incompletely explained. This review examines the role of viscoelasticity in improving micropore sweep efficiency during polymer flooding. A clear distinction is made between micropore access (flow penetration into low-connectivity microdomains) and micropore mobilization (release of trapped oil in dead-end pores and corners). The analysis synthesizes experimental observations, pore-scale simulations, and rheological considerations to evaluate whether elastic stresses contribute to additional oil displacement mechanisms beyond shear viscosity effects. Particular attention is given to extensional flow behavior in converging–diverging pore geometries, the influence of crude oil viscosity, and the role of salinity, temperature, and mechanical degradation in suppressing viscoelastic responses. The review demonstrates that viscoelastic contributions to oil recovery are condition-dependent and most pronounced within specific viscosity and operational windows. Variability in reported results is largely attributed to inconsistent rheological characterization and insufficient consideration of degradation effects. Standardized brine-conditioned rheological protocols, including extensional metrics where feasible, are recommended to improve reproducibility and predictive capability. The findings highlight the need for multi-scale validation linking pore-scale mechanisms to core-scale displacement and field performance.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>вязкоупругое полимерное заводнение</kwd><kwd>эффективность охвата микропор</kwd><kwd>повышение нефтеотдачи</kwd><kwd>поромасштабные механизмы</kwd><kwd>мобилизация остаточной нефти</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Viscoelastic polymer flooding</kwd><kwd>micropore sweep efficiency</kwd><kwd>enhanced oil recovery</kwd><kwd>pore-scale mechanisms</kwd><kwd>residual oil mobilization</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">Rock, A.H. On the role of polymer viscoelasticity in enhanced oil recovery: Extensive laboratory data and review. Polymers, 12(2276) (2020). https://doi.org/10.3390/polym12102276</mixed-citation><mixed-citation xml:lang="en">Rock, A.H. On the role of polymer viscoelasticity in enhanced oil recovery: Extensive laboratory data and review. Polymers, 12(2276) (2020). https://doi.org/10.3390/polym12102276</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Zeynalli, M.M.-S. A comprehensive review of viscoelastic polymer flooding in sandstone and carbonate rocks. Scientific Reports, 13(17679) (2023). https://doi.org/10.1038/s41598-023-44896-9</mixed-citation><mixed-citation xml:lang="en">Zeynalli, M.M.-S. A comprehensive review of viscoelastic polymer flooding in sandstone and carbonate rocks. Scientific Reports, 13(17679) (2023). https://doi.org/10.1038/s41598-023-44896-9</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Dzanic, V.S. Mobilization of trapped oil droplet in porous media through viscoelasticity. Physics of Fluids, 35 (2023). https://doi.org/10.1063/5.0163902</mixed-citation><mixed-citation xml:lang="en">Dzanic, V.S. Mobilization of trapped oil droplet in porous media through viscoelasticity. Physics of Fluids, 35 (2023). https://doi.org/10.1063/5.0163902</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Azad, M.S. Extensional effects during viscoelastic polymer flooding: Understanding unresolved challenges. SPE Journal, 1827–1841 (2020). https://doi.org/10.2118/201112-PA</mixed-citation><mixed-citation xml:lang="en">Azad, M.S. Extensional effects during viscoelastic polymer flooding: Understanding unresolved challenges. SPE Journal, 1827–1841 (2020). https://doi.org/10.2118/201112-PA</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Xue, X.Z. Enhancing heavy-oil displacement efficiency through viscoelasticity of polymer solution by investigating the viscosity limit of crude oil: An experimental study. Energy Science &amp; Engineering, 1–12 (2024). https://doi.org/10.1002/ese3.1753</mixed-citation><mixed-citation xml:lang="en">Xue, X.Z. Enhancing heavy-oil displacement efficiency through viscoelasticity of polymer solution by investigating the viscosity limit of crude oil: An experimental study. Energy Science &amp; Engineering, 1–12 (2024). https://doi.org/10.1002/ese3.1753</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Wang, S.S. Microscopic experimental study on the sweep and displacement efficiencies in heterogeneous heavy oil reservoirs. Energy Reports, 7, 1627–1635 (2021). https://doi.org/10.1016/j.egyr.2021.03.018</mixed-citation><mixed-citation xml:lang="en">Wang, S.S. Microscopic experimental study on the sweep and displacement efficiencies in heterogeneous heavy oil reservoirs. Energy Reports, 7, 1627–1635 (2021). https://doi.org/10.1016/j.egyr.2021.03.018</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Zhu, S.Z. Study on viscoelastic characteristics of polymer solution formation and their effect on oil displacement efficiency. Polymers, 18(2) (2026). https://doi.org/10.3390/polym18010002</mixed-citation><mixed-citation xml:lang="en">Zhu, S.Z. Study on viscoelastic characteristics of polymer solution formation and their effect on oil displacement efficiency. Polymers, 18(2) (2026). https://doi.org/10.3390/polym18010002</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Zhang, F.J. Laboratory experimental study on polymer flooding in high-temperature and high-salinity heavy oil reservoir. Applied Sciences, 12(11872) (2022). https://doi.org/10.3390/app122211872</mixed-citation><mixed-citation xml:lang="en">Zhang, F.J. Laboratory experimental study on polymer flooding in high-temperature and high-salinity heavy oil reservoir. Applied Sciences, 12(11872) (2022). https://doi.org/10.3390/app122211872</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Herrera, J.M. Experimental evaluation of the mechanical degradation of HPAM polymeric solutions used in enhanced oil recovery. CT&amp;F – Ciencia, Tecnología y Futuro, 10, 131–141 (2020). https://doi.org/10.29047/issn.0122-5383</mixed-citation><mixed-citation xml:lang="en">Herrera, J.M. Experimental evaluation of the mechanical degradation of HPAM polymeric solutions used in enhanced oil recovery. CT&amp;F – Ciencia, Tecnología y Futuro, 10, 131–141 (2020). https://doi.org/10.29047/issn.0122-5383</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Anil, A.A. Experimental investigation of the effect of viscoelasticity on enhanced oil recovery during polymer flooding. ACS Omega (2025). https://orcid.org/0000-0001-9818-2866</mixed-citation><mixed-citation xml:lang="en">Anil, A.A. Experimental investigation of the effect of viscoelasticity on enhanced oil recovery during polymer flooding. ACS Omega (2025). https://orcid.org/0000-0001-9818-2866</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Sun, X.S. Study on the occurrence characteristics of the remaining oil in sandstone reservoirs with different permeability after polymer flooding. Polymers, 16(1902) (2024). https://doi.org/10.3390/polym16131902</mixed-citation><mixed-citation xml:lang="en">Sun, X.S. Study on the occurrence characteristics of the remaining oil in sandstone reservoirs with different permeability after polymer flooding. Polymers, 16(1902) (2024). https://doi.org/10.3390/polym16131902</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Huang, J.C. Numerical study for the performance of viscoelastic fluids on displacing oil based on the fractional-order Maxwell model. Polymers, 14(5381) (2022). https://doi.org/10.3390/polym14245381</mixed-citation><mixed-citation xml:lang="en">Huang, J.C. Numerical study for the performance of viscoelastic fluids on displacing oil based on the fractional-order Maxwell model. Polymers, 14(5381) (2022). https://doi.org/10.3390/polym14245381</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Zhu, W.L. Pore-scale experiments reveal distinct flow field of polymer flooding with viscoelasticity loss by high salinity. Colloids and Surfaces A: Physicochemical and Engineering Aspects (2023). https://doi.org/10.1016/j.colsurfa.2023.131473</mixed-citation><mixed-citation xml:lang="en">Zhu, W.L. Pore-scale experiments reveal distinct flow field of polymer flooding with viscoelasticity loss by high salinity. Colloids and Surfaces A: Physicochemical and Engineering Aspects (2023). https://doi.org/10.1016/j.colsurfa.2023.131473</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Zhong, H.H. Modeling of microflow during viscoelastic polymer flooding in heterogeneous reservoirs of Daqing Oilfield. Journal of Petroleum Science and Engineering, 210(110091) (2022). https://doi.org/10.1016/j.petrol.2021.110091</mixed-citation><mixed-citation xml:lang="en">Zhong, H.H. Modeling of microflow during viscoelastic polymer flooding in heterogeneous reservoirs of Daqing Oilfield. Journal of Petroleum Science and Engineering, 210(110091) (2022). https://doi.org/10.1016/j.petrol.2021.110091</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Daripa, P.M. Modeling shear thinning polymer flooding using a dynamic viscosity model. Physics of Fluids, 35(046606) (2023). https://doi.org/10.1063/5.0145061</mixed-citation><mixed-citation xml:lang="en">Daripa, P.M. Modeling shear thinning polymer flooding using a dynamic viscosity model. Physics of Fluids, 35(046606) (2023). https://doi.org/10.1063/5.0145061</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Ahmed, M.E. Enhancing the oil recovery from naturally fractured reservoirs using viscoelastic surfactant (VES) flooding: A field-scale simulation. ACS Omega, 7, 504–517 (2022). http://pubs.acs.org/journal/acsodf?ref=pdf</mixed-citation><mixed-citation xml:lang="en">Ahmed, M.E. Enhancing the oil recovery from naturally fractured reservoirs using viscoelastic surfactant (VES) flooding: A field-scale simulation. ACS Omega, 7, 504–517 (2022). http://pubs.acs.org/journal/acsodf?ref=pdf</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
