Flow and heat exchange calculation of waxy oil in the industrial pipeline

Numerous experimental and field studies have established that during the development of oil and gas fields, there are deformations of rocks that occur due to changes in reservoir pressure. It is established that with a drop in reservoir pressure, the volume of the pore space of the formation decreases due to the elastic expansion of the rock grains and an increase in compressive forces transmitted to the skeleton from the masses of the overlying rocks. As a result, there is a change in the deformation processes in the porous medium, accompanied by a decrease in its porosity and permeability, and a more significant change, compared with the porosity of the formation, is the permeability under one and the same pressure change. The manifestation of these anomalies in reservoir conditions, which cause nonlinear effects, can significantly affect the entire process of reservoir development and lead to various qualitative and quantitative discrepancies between the observed facts and the indicators that were calculated.

Section: Experimental Part and Discussion Of Resultsmentioning

confidence: 99%

Horizontal wells as a means of intensification of oil production

Jalalov¹,

Kunayeva²,

Bayamirova³

2021

“…The topology of the object consists of the topology of the linear part of the pipeline and the topology of the stations. The accuracy of the simulation results of hot oil pumping is determined by the calculations of pressure and temperature in the oil pipeline [ [22], [23]].…”

Section: Problem Statementmentioning

confidence: 99%

“…In the linear part, the oil temperature decreases due to heat exchange with the surrounding soil of the pipeline, and there are various models for calculating the heat exchange of the oil flow with the surrounding soil [ [22], [23]]. Some calculation parameters are known: flow rate, insulation, soil temperature, and the properties of oil and metal pipes.…”

Section: Temperature Distribution Calculation Along the Pipelinementioning

confidence: 99%

Mismatch problem of the model and topology of oil pumping facilities

Bekibayev¹,

Bossinov²,

Zhapbasbayev³

et al. 2023

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.

“…Taking into that pressure drop in the section between two OPS at the fixed value Q does not depend on pressure at the outlet of the initial OPS, it is possible to determine minimum allowable pressure at the outlet of OPS so that the pressure condition at the inlet to the next station is fulfilled (12). Obviously, the value of such pressure for the k-th OPS should be no less in min 1 ac k P   , i.e.…”

Section: P P P P  (30)mentioning

confidence: 99%

“…The algorithm for calculating energy consumption was used to carry out thermalhydraulic calculations and showed its effectiveness in determining the rational operating modes of pumping units [ [11], [12], [13]].…”

mentioning

confidence: 99%

The problem of optimizing pumping units for oil transportation

Bekibayev¹,

Ramazanova²,

Pakhomov³

2022

Self Cite

During pipeline transportation of oil through main oil pipelines, the greater part of the energy consumed is spent on the operation of main and booster pumping units at oil pumping stations. In this regard, the determination of the optimal operating modes of pumping units is an urgent problem for energy saving. The article is devoted to the optimization of the operation of pumping units for energy saving of oil pipeline transport. The operation of pumping units is regulated using removable rotors with different diameters of impellers or a frequency-controlled drive. An optimization criterion has been formulated to minimize the operating costs of pumping units. A technique for determining the energy consumption of pumping units with different diameters of impellers and a frequency-controlled drive is presented. An algorithm for finding the optimal operating mode of pumping units is presented, which was built using the definitions of graph theory and dynamic programming.