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The purpose of the study is to identify the hydraulic resistance coefficient of the main oil pipeline. Oil transportation through pipelines is the most efficient way to deliver oil from suppliers to consumers. The volume of transported oil depends on the pipeline hydraulic resistance. In practice, the hydraulic resistance coefficient is determined by the value of the Reynolds number and the pipeline internal surface roughness. The Reynolds number depends on the oil viscosity, which changes in a non-isothermal pipeline due to the heat exchange of the oil flow with the environment. The pipeline internal surface roughness changes during main oil pipeline operation. The identification of the pipeline hydraulic resistance coefficient is necessary for accurate calculations of the technological modes of the main oil pipeline. The SCADA (supervisory control and data acquisition) system determines the actual oil data (pressure, temperature, flow rate) along the main oil pipeline length in real time. Based on the results of the thermal-hydraulic calculations and the SCADA system, the hydraulic resistance coefficient identification method was built. The methodology was tested in Timur Bekibayev ABOUT THE AUTHOR Timur Bekibayev is the Laureate of the State Prize of the Republic of Kazakhstan in the field of science and technology, Master of Information Systems, Head of the Department at Satbayev University. His research interests are related to the theory of algorithms and data structures, optimization methods, neural networks and programming problems in physics and technology. Uzak Zhapbasbayev is the Laureate of the State Prize of the Republic of Kazakhstan in the field of science and technology, Doctor of Technical Science, Professor, Head of the Research Laboratory at Satbayev University. He has written more than 190 publications. He has been the scientific supervisor of more than 25 international and Kazakhstan scientific projects. Gaukhar Ramazanova is the Candidate of Physical and Mathematical Sciences, Senior Researcher at Satbayev University. She has written more than 60 publications, including "Modeling of the beryllia ceramics formation process", "Management of Oil Transportation by Main Pipelines". Her research interests are related to rheological models, non-Newtonian flows, data mining.