<b>KON SHAROITIDA QUVURLARDAGI GAZ–SUYUQLIK HARAKATI JARAYONIDA OQIM STRUKTURALARI O‘ZGARISHI TAHLILI</b>

This paper analyzes the flow behavior of gas–liquid mixtures in pipelines and reviews modern approaches to hydraulic calculations of two-phase flows. The main hydrodynamic and thermodynamic factors affecting the transportation of gas, oil, condensate, and water mixtures are examined. The results of theoretical, semi-empirical, and experimental studies are summarized with particular attention to pressure losses, true gas holdup, hydraulic resistance coefficients, and flow pattern transitions. The characteristics of stratified, slug, and annular flow regimes and their influence on pipeline performance are discussed. The analysis demonstrates that many existing models do not adequately account for flow pattern transitions and the specific features of multiphase flow in pipelines with varying terrain profiles. Therefore, the development of more universal mathematical models capable of accurately describing complex gas–liquid flow processes remains an important scientific and engineering challenge. The findings of this study can serve as a scientific basis for improving hydraulic calculations, optimizing pipeline design, and enhancing the operational efficiency and reliability of oil and gas transportation systems.

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