English

Vol. 7 3, 2017 p 41-47

Pages

Article name, authors, abstract and keyword

41-47

Issue of anti-turbulent additives degradation in pipelines for raw hydrocarbons

Rustam G. Shagiev a, Asgat G. Gumerov a, Larisa P. Khudyakova b

a Pipeline Transport Institute, LLC (Transneft R&D, LLC), 47a, Sevastopolskiy prospect, Moscow, 117186, Russian Federation

b Research and Development center of pipeline transportation Transneft R&D LLC (STC Transneft R&D), 144/3 Oktyabrya prospect, 450055, Ufa, Bashkortostan, Russian Federation

https://doi.org/10.28999/2541-9595-2017-7-3-41-47

Abstract: Introduction. The degradation of anti-turbulence additives (ATA), which reduce turbulent friction, is an important factor that affects the various process aspects of pipeline transport of oil and petroleum products. The value of hydraulic efficiency at the intermediate points makes an adequate detection of emergency leaks possible, as well as provides a calculation of the pressure at intermediate points under steady-state pumping modes, and dynamic overloads during transient processes. The empirical degradation models presented in the survey do not allow the calculation of the hydraulic efficiency of ATA as a function of the concentration, transfer rate, diameter and roughness of the tubes, the molecular mass distribution function of macromolecules, and the kinetics of mechanical degradation.
Mathematical model. The paper presents a mathematical model of ATA degradation kinetics in an oil pipeline developed with taking into account the threshold for the degradation termination and the molecular mass distribution function of macromolecules, as well as the dependence of the rate of degradation on the flow velocity, the geometric parameters of the pipeline, and the physical and chemical parameters of raw hydrocarbons. Model parameters were identified on the basis of experimental data obtained at one of the regimes at a constant concentration of the additive.
Results and conclusions. Predictive estimates on other regimes showed a satisfactory correspondence of the theory to the actual situation, which is the first evidence that the mathematical model is adequate. To define the kinetics of ATA degradation in more detail, depending on the regime, geometric and physical and chemical parameters, it is necessary to use more accurate molecular-mass distribution functions and polymer solubility parameters.

Keywords: anti-turbulent additives, degradation, degradation termination threshold, testing, mathematical model

Reference for citing:
Shagiev R.G., Gumerov A.G., Khudyakova L.P. Issue of anti-turbulent additives degradation in pipelines for raw hydrocarbons. Naukatekhnol. truboprov. transp. neftiinefteprod. = Science & Technologies: Oil and Oil Products Pipeline Transportation. 2017;7(3):4147.

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