Mismatch problem of the model and topology of oil pumping facilities

Abstract

The mismatch of the model and the topology of real objects is important in modeling technological processes, which is the purpose of this paper. The problem is considered when modeling hot oil pumping in the "Kasymov–Bolshoy Chagan" oil pipeline. In this problem, the topology of objects consists of the linear part of the pipeline and technological equipment (pumps and heating furnaces) of the stations. The accuracy of the simulation results is determined by the calculations of pressure and temperature in the oil pipeline. The pressure in the pipeline is created by pumps at the stations and is determined by the dependence of the pressure and efficiency of the pump on the oil flow rate. These characteristics change depending on the service life of the pump. The identification of the actual dependences of the pressure and efficiency of the pump on the oil flow rate was carried out by the regression analysis of experimental data. The pressure in the linear part is determined by the hydraulic resistance of the pipeline. The actual dependence of the hydraulic resistance coefficient on the Reynolds number and wall roughness was obtained by regression analysis of experimental data. The temperature in the oil pipeline is created at the stations by heating furnaces. The identification of the actual characteristics of the heating furnace was also found by regression analysis of the experimental data. The temperature distribution in the linear part is determined by the heat transfer of oil with the surrounding environment. An undefined parameter for calculating heat transfer is the soil thermal conductivity, which depends on the type of rock and the degree of soil moisture. The soil thermal conductivity is determined in such a way that at a given oil flow rate, oil temperatures at the beginning of the section and soil at the section, the calculated oil temperature at the end of the section has the smallest discrepancy with the actual one. Thus, the determination of the actual dependencies of the objects makes it possible to increase the accuracy of the results of hot pumping modeling and eliminates the mismatches of the model and the topology of the objects.

Comparative predictions of turbulent non-isothermal flow of a viscoplastic fluid with yield stress

“…The fluid flow (WCO) exhibits the NF behavior when T > 293 K. This agrees with numerical calculations data for laminar flow of waxy crude oil in a pipe [ 11 ]. Earlier in works [ 35 , 41 , 42 ] it was shown that heat transfer of moving fluid flow in pipe or channel and surrounding ground has the main influence on manifestation of non-Newtonian properties of SB liquid. The results of numerical calculations for influence of ambient soil temperature T S on turbulent characteristics of paraffinic oil are shown in Fig.…”

“…The expression in equation (4) is found according to representation [ 27 ]. The last term in equation (5) takes into account the dissipation of kinetic energy and has the form [ [33] , [34] , [35] ]. The expression for the average shear rate in the non-Newtonian fluid was given in Ref.…”

Digitalization of the thermoplastic beryllium oxide slurry forming process using ultrasonic activation

“…The apparent heat capacity method [ [13], [14], [15], [16], [17], [18], [19], [20], [21]] determines changes in the heat capacity and enthalpy of the slurry during the phase transition. The heat capacity of the slurry increases due to the latent heat associated with the phase transition within the temperature range [ [14], [15], [21]]:…”

Digitalization of the Astrakhan-Mangyshlak Main Water Pipeline

“…To update the initial data, the following information was used (Zhapbasbayev et al, 2021;Besimbayeva et al, 2023;Bekibayev et al, 2023;Beisembetov et al, 2020;Sangulova et al, 2022;Bekibayev et al, 2022): pipeline profiles; pipe parameters; list and location of stations on the linear part; list and location of measuring units on the linear part; list and location of various taps on the linear part; list and location of pump units in stations. passport characteristics of pumps and electric motors; physical water parameters (including rheological properties); water pipeline setting and protection maps; electric power tariffs.…”