scholarly journals Modification of Mode Parameters of Main Oil Pipelines under the Condition of Depressurizing

2020 ◽  
pp. 26-35
Author(s):  
V. Т. Bolonnyi
Keyword(s):  
Oil Pollution ◽  
Equations Of Motion ◽  
Pressure Fluctuations ◽  
Pressure Change ◽  
Oscillatory Process ◽  
Pipeline Transportation ◽  
Oil Pipeline ◽  
Oil Pipelines ◽  
Calculation Results ◽  
The Usa

The characteristics of Ukrainian oil transportation system are presented; the emergency risks of Ukrainian oil pipelines are established. The analysis of the accident rate of oil pipeline transportation in Ukraine, Russia and the USA was carried out. The processes of initiation and progression of man-made emergencies in Ukraine during the oil pipelines operation are considered. The article presents the technique of specifying the incidental pressure in a pipeline, depending on the amount of oil loss at the site of oil leaks. It gives an opportunity to calculate the amount of oil loss and to evaluate the environmental hazards caused by oil pipeline transportation emergencies.  It is based on the equations of motion and continuity of fluid flow. This technique makes it possible to calculate the pressure at each point of a pipeline in transient mode caused by changes in pressure at the beginning and at the end of the section and the emergence of concentrated oil offtake. It also gives an opportunity to monitor the change in mode parameters along the pipeline under conditions of pipeline depressurization. Maximum discrepancy in calculation results becomes typical when the range of fluctuations is maximal. It has been established that discrepancy increases when the distance from the source of perturbation becomes bigger. The discrepancy in calculation results is practically non-existent for the pressure fluctuations at the point of perturbation start (). Based on the results of calculations, the author constructs a graph of pressure change of the oscillatory process in the oil pipeline caused by the jump in the pressure at the beginning and at the end of the section, and the presence of probable leaks at the certain point of the pipeline route. The line section of the main oil pipelines is the most dangerous part since all emergencies are associated with emergency processes of different intensity in the form of outflow of oil into the environment, and are dangerous because of system breakdowns can take place. Both the process of the generation of the oil pollution zone and its time period depend on the amount of oil leakage, its intensity and depth of the oil pipeline.

scholarly journals Evaluation of the effectiveness of anti-turbulent additives in the oil pipeline transportation

2020 ◽  
Vol 157 ◽  
pp. 02005
Author(s):  
Aleksei Balabukha ◽  
Valentina Zvereva
Keyword(s):  
Friction Coefficient ◽  
Experimental Studies ◽  
Computer Application ◽  
Eastern Siberia ◽  
Practical Application ◽  
Pipeline Transportation ◽  
Pressure Losses ◽  
Oil Pipeline ◽  
Oil Pipelines ◽  
High Degree

The authors of the article have developed the computer application allows to determine the value of the friction coefficient λ and anti-turbulent additives efficiency with a high degree of accuracy. The program can be used in the calculations and design of oil pipelines. The paper presents experimental studies of the effect anti-turbulent additives on the magnitude of pressure losses during fluid movement through pipes. The data gained by the developed computer program has been proved by the data of practical application of additives in the real oil pipeline transportation system called Eastern Siberia-Pacific Ocean oil pipeline.

scholarly journals Research of Application of Anti-Turbulent and Depressor Additives in Pipeline Transport of High Viscosity Oils

2021 ◽  
Vol 137 (6) ◽  
pp. 54-56
Author(s):  
A. K. Nikolaev ◽  
◽  
E. S. Demenin ◽  
K. I. Plotnikova ◽  
◽  
...  
Keyword(s):  
Experimental Study ◽  
Hydraulic Resistance ◽  
Theoretical Study ◽  
High Viscosity ◽  
Pipeline Transport ◽  
Oil Pipeline ◽  
Oil Pipelines ◽  
The Usa ◽  
High Viscosity Oil ◽  
Main Oil Pipeline

The use of anti-turbulent and depressant additives makes it possible to increase the efficiency of oil pipelines transporting high-viscosity oil. In this method, the principle of increasing the efficiency of transportation is based on reducing the hydraulic resistance and increasing the fluidity of oil. The work carried out a theoretical study of the existing types of anti-turbulent and depressant additives. This article presents an experimental study of the effect of the MR 1088 depressant additive on an oil sample from the Usa – Ukhta main oil pipeline.

Estimation of temporary decommissioning impact on reliability and durability of oil pipelines

2019 ◽  
Vol 1-2 (94) ◽  
pp. 22-31
Author(s):  
L. Poberezhny ◽  
R. Martyniuk ◽  
A. Stanetsky ◽  
L. Poberezhna ◽  
O. Tkach ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Fatigue Strength ◽  
Pressure Fluctuations ◽  
Experimental Studies ◽  
Fatigue Curve ◽  
Pipe Material ◽  
Oil Pipeline ◽  
Oil Transportation ◽  
Oil Pipelines ◽  
The Mathematical Model

Purpose: Due to changes in the volume of oil transportation, part of the pipelines must be temporarily decommissioned. The purpose of the work is theoretical and experimental study of pressure fluctuations during operation of oil pipelines and their impact on the durability of the pipeline material in work state and after temporary decommissioning (conservation). Design/methodology/approach: The results of oil pressure fluctuation research have given a chance to choose the terms of experimental research providing of the pipe metal mechanical features changes research during oil pipeline exploitation. Findings: Fatigue test modes are selected based on the calculations of the mathematical model developed. Experimental studies of the dependence of the fatigue strength of the pipe material on the conditions of operation have been carried out, which made it possible to determine the parameters of the fatigue curve of the samples. Has been defined that fatigue strength for the new metal pipe samples is more for 20-25% than for the metal samples which had the contacts with lime milk and for 30-40% more than for metal samples which were under exploitation. Research limitations/implications: In the future, more combination of "pipe material – preservation medium" should be explored to establish pain of general regularities. Practical implications: The probabilistic curves of the pipeline non-destruction are constructed, which will be used for practical calculations of the reliability and durability of the 13G1S-U steel pipelines. Originality/value: Mathematical model is made that describes non-stationary oil moves in oil pipeline, that has been caused by jump like changes of oil supply in oil pipeline, on this basis was defined, that oil pressure in oil pipeline provides within non stationary process in a range of 0.4-0.6 Hz frequency and amplitude fluctuation of pressure is 0.1-0.5 MPa.

Modern ideas about natural monopolies and their tariff regulation. Part 2. State regulation

2021 ◽  
pp. 224-236
Author(s):  
Павел Юрьевич Сериков ◽  
Надежда Викторовна Гончарова ◽  
Ирина Павловна Серикова
Keyword(s):  
Price Index ◽  
Consumer Price Index ◽  
Petroleum Products ◽  
State Regulation ◽  
Theory And Practice ◽  
Price Ratio ◽  
Federal Law ◽  
Pipeline Transportation ◽  
Oil Pipeline ◽  
The Usa

В продолжение исследования теории и практики государственного регулирования естественных монополий критически проанализирован ряд неценовых и ценовых методов регулирования. Рассмотрен опыт ценового (тарифного) регулирования сферы трубопроводного транспорта нефти и нефтепродуктов в России и США. Отмечено, что для регулирования тарифов нефтепроводных компаний в США используется комбинированный метод долгосрочной индексации, при этом пересмотр рабочего индекса осуществляется каждые пять лет. В нашей стране с целью регулирования отрасли магистрального нефтепроводного транспорта регламентировано применение значительного ряда методов, однако фактически используется только один из них - индексирование. При этом возникает множество вопросов, связанных с выбором тарифной базы, собственно индекса, а также с установленным периодом регулирования. Авторы отмечают, что в качестве базового оптимально использовать индекс цен производителей промышленной продукции. Указывается, что регулирование тарифов на услуги естественных монополий (в частности, нефтепроводного транспорта) в привязке к индексу потребительских цен возможно лишь в течение ограниченного периода времени и при условии действия гибких правил изменения формулы цены, иначе не исключено формирование структурных и социально-экономических диспропорций за счет искажения соотношения цен в различных секторах экономики. Ключевыми условиями для решения проблем государственного регулирования естественно-монопольных компаний следует считать обновление Федерального закона «О естественных монополиях» № 147-ФЗ и продолжение работы над проектом закона «Об основах государственного регулирования цен (тарифов)», в том числе в части законодательного закрепления методов регулирования при обязательном учете отраслевой и видовой специфики регулируемых компаний и сочетании общих и специфических подходов к регулированию. In continuation of the research of the theory and practice of state regulation of natural monopolies, a number of non-price and price regulation methods are critically analyzed. The experience of price (tariff) regulation of the sphere of pipeline transportation of oil and petroleum products in Russia and the USA is considered. It is noted that a combined method of long-term indexation is used to regulate tariffs of oil pipeline companies in the USA, with a revision of the working index every five years. In our country, in order to control the industry of main pipeline transportation a significant number of methods are regulated, but in fact only one of them is used - indexation. In this case, there are many questions related to the choice of the tariff base, the index itself and the set period of regulation. The authors note that it is optimal to use the price index of industrial product producers as the base one. It is indicated that the regulation of tariffs for the services of natural monopolies (in particular, oil pipeline transportation) in the “context” of the consumer price index is possible only for a limited period of time and subject to flexible rules for changing the price formula, otherwise the formation of structural and socioeconomic disparities through the distortion of the price ratio in various sectors of the economy is not excluded. The key conditions for solving the problems of state control of natural monopolies should be the updating of the Federal Law «On Natural Monopolies» No. 147-FZ and the continuation of work on the draft law «On the Principles of State Regulation of Prices (Tariffs)», including in terms of legislative consolidation of regulation methods with mandatory consideration of the industry and specific features of regulated companies and a combination of general and specific approaches to regulation.

Q-H characteristics for heavy crude oil pipeline

2021 ◽  
pp. 32-39
Author(s):  
Сергей Евгеньевич Кутуков ◽  
Ольга Витальевна Четверткова ◽  
Андрей Иванович Гольянов
Keyword(s):  
Detection System ◽  
Hydraulic Calculation ◽  
Pipeline System ◽  
Hydraulic Characteristics ◽  
Oil Pipeline ◽  
Oil Pipelines ◽  
Oil Flow ◽  
Direct Interpretation ◽  
Calculation Results ◽  
Oil Blend

Проблема повышения точности технологических расчетов нефтепроводов обрела особую остроту на фоне модернизации системы обнаружения утечек и разработки программного обеспечения в области планирования грузопотоков в системе магистральных трубопроводов. Расхождение результатов гидравлических расчетов и фактических параметров перекачки вызвано, в частности, такими факторами, как игнорирование мультифазного характера течения нефти (особенно на недогруженных участках нефтепроводов, проложенных по пересеченной местности), отсутствие актуальных данных по состоянию длительно эксплуатируемых труб, применение методик расчета потерь энергии на трение, базирующихся на постулатах классической гидравлики. В настоящей статье авторами предложен метод определения гидравлической характеристики трубопровода на установившемся режиме эксплуатации, перекачивающего неньютоновские реологически сложные нефти в диапазоне малых скоростей сдвига, который предполагает непосредственную интерпретацию экспериментальных данных вискозиметрии и исключает погрешности аппроксимации кривой течения реологической моделью и осреднения параметра вязкости. С этой целью рассмотрены вопросы аномалии вязкости и тиксотропии неньютоновских нефтей. Дано обоснование предлагаемого метода и представлено практическое приложение излагаемой методики на примере анализа гидравлической характеристики магистрального нефтепровода Атырау-Самара, по которому транспортируется смесь нефтей с частично разрушенной внутренней структурой. The problem of improving the accuracy of technological calculations for oil pipelines has become especially acute against the background of modernization of the leak detection system and development of software in the field of planning cargo flows in the trunk pipeline system. Discrepancy between hydraulic calculation results and actual pumping parameters is caused, in particular, by such factors as ignoring the multiphase oil flow nature (especially in under-loaded sections of oil pipelines laid over rough terrain), the lack of up-to-date data on the state of long-operating pipes, the use of methods for calculating friction-related energy losses based on the postulates of classical hydraulics. In this article, the authors propose a method for determining the hydraulic characteristics of a pipeline at steady state operation, pumping non-Newtonian rheologically complex oils in the range of low shear rates, which implies a direct interpretation of experimental viscometry data, excluding errors in approximating the flow curve by a rheological model and averaging the viscosity parameter. For this purpose, the anomaly of viscosity and thixotropy of non-Newtonian oils are considered. The article provides a substantiation of the proposed method and presents a practical application of the described technique by the example of the analysis of the hydraulic characteristics of the Atyrau-Samara main oil pipeline, through which an oil blend with partially destroyed internal structure is transported.

Using clusterization principles for the selection of repair sections of main oil pipelines based on diagnostic data

2011 ◽  
Vol 8 (1) ◽  
pp. 201-210
Author(s):  
R.M. Bogdanov
Keyword(s):  
Cluster Analysis ◽  
Defect Density ◽  
Density Variation ◽  
Distance Functions ◽  
Oil Pipeline ◽  
Oil Pipelines ◽  
Classification Of Images ◽  
Main Oil Pipeline ◽  
Selection Of

The problem of determining the repair sections of the main oil pipeline is solved, basing on the classification of images using distance functions and the clustering principle, The criteria characterizing the cluster are determined by certain given values, based on a comparison with which the defect is assigned to a given cluster, procedures for the redistribution of defects in cluster zones are provided, and the cluster zones parameters are being changed. Calculations are demonstrating the range of defect density variation depending on pipeline sections and the universal capabilities of linear objects configuration with arbitrary density, provided by cluster analysis.

Modified equations for hydraulic calculation of thermally insulated oil pipelines for the case of a power-law fluid

2021 ◽  
pp. 388-395
Author(s):  
Марат Замирович Ямилев ◽  
Азат Маратович Масагутов ◽  
Александр Константинович Николаев ◽  
Владимир Викторович Пшенин ◽  
Наталья Алексеевна Зарипова ◽  
...  
Keyword(s):  
Power Law ◽  
Analytical Calculation ◽  
High Viscosity ◽  
Hydraulic Calculation ◽  
Flow Index ◽  
Pipeline System ◽  
Power Law Fluid ◽  
Simplified Approach ◽  
Oil Pipeline ◽  
Oil Pipelines

Теплогидравлический расчет неизотермических трубопроводов является наиболее важным гидравлическим расчетом в рамках решения задач обеспечения надежности и безопасности работы нефтепроводной системы. Для практических расчетов применяются формулы Дарси - Вейсбаха и Лейбензона. При этом в ряде случаев (короткие теплоизолированные участки, поверхностный обогрев нефтепроводов) можно использовать упрощенный подход к расчету, пренебрегая изменением температуры или учитывая температурные поправки. В настоящее время формулы для аналитического расчета движения высоковязких нефтей в форме уравнения Лейбензона получены только для ньютоновской и вязкопластичной жидкостей. Для степенной жидкости соответствующие зависимости отсутствуют, расчет ведется с использованием формулы Дарси - Вейсбаха. Целью настоящей статьи является представление формулы Дарси - Вейсбаха для изотермических течений степенной жидкости в форме уравнения Лейбензона. Данное представление позволит упростить процедуру проведения аналитических выкладок. В результате получены модифицированные уравнения Лейбензона для определения потери напора на участке нефтепровода в диапазоне индекса течения от 0,5 до 1,25. В указанном диапазоне относительное отклонение от результатов расчетов с использованием классических формул Метцнера - Рида и Ирвина не превышает 2 %. The thermal-hydraulic calculation of non-isothermal pipelines is the most important hydraulic calculation in the framework of solving the problems of ensuring the reliability and safety of the oil pipeline system. For practical calculations, the Darcy - Weisbach and Leibenson formulas are used. Moreover, in a number of cases (short heat-insulated sections, surface heating of oil pipelines), a simplified approach to the calculation can be used, neglecting temperature changes or taking into account temperature corrections. At present, formulas for the analytical calculation of the motion of high-viscosity oils in the form of the Leibenson equation have been obtained only for Newtonian and viscoplastic fluids. For a power-law fluid, there are no corresponding dependences; the calculation is carried out using the Darcy - Weisbach formula. The purpose of this article is to present the Darcy - Weisbach formula for isothermal flows of a power-law fluid in the Leibenzon form, which will simplify the procedure for performing analytical calculations. The modified Leibenzon equations are obtained to determine the head loss in the oil pipeline section in the range of the flow index from 0.5 to 1.25. In the specified range, the relative deviation from the results of calculations using the classical Metzner - Reed and Irwin formulas does not exceed 2 %.

Implementing a Geohazard Integrity Management Program: Statistics and Lessons Learned Over 15 Years

2014 ◽  
Author(s):  
Alex J. Baumgard ◽  
Tara L. Coultish ◽  
Gerry W. Ferris
Keyword(s):  
Management System ◽  
Management Program ◽  
Lessons Learned ◽  
Proactive Approach ◽  
Oil Pipelines ◽  
Pipeline Networks ◽  
The Usa ◽  
Integrity Management ◽  
Pipeline Failures ◽  
Program Challenges

Over the last 15 years, BGC Engineering Inc. has developed and implemented a geohazards Integrity Management Program (IMP) with 12 major pipeline operators (consisting of gas and oil pipelines and of both gathering and transmission systems). Over this time, the program has been applied to the assessment of approximately 13,500 individual hydrotechnical and geotechnical geohazard sites spanning approximately 63,000 km of operating pipelines in Canada and the USA. Hydrotechnical (watercourse) and geotechnical (slope) hazards are the primary types of geohazards that have directly contributed to pipeline failures in Canada. As with all IMPs, the core objectives of a geohazard management system are to ensure a proactive approach that is repeatable and defensible. In order to meet these objectives, the program allows for varying levels of intensity of inspection and a recommended timescale for completion of actions to manage the identified geohazards in accordance with the degree of hazard that the site poses to the pipeline. In this way, the sites are managed in a proactive manner while remaining flexible to accommodate the most current conditions at each site. This paper will provide a background to the key components of the program related specifically to existing operating pipeline systems, present pertinent statistics on the occurrence of various types of geohazards based on the large dataset of inspections, and discuss some of the lessons learned in the form of program results and program challenges from implementing a geohazard integrity management system for a dozen operators with different ages of systems, complexity of pipeline networks, and in varied geographic settings.

scholarly journals Study on Optimizing Operation of Preheating Commissioning for Waxy Crude Oil Pipelines

2014 ◽  
Vol 6 ◽  
pp. 894256
Author(s):  
Jian Zhang ◽  
Yi Wang ◽  
Xinran Wang ◽  
Handu Dong ◽  
Jinping Huang ◽  
...  
Keyword(s):  
Crude Oil ◽  
Outlet Temperature ◽  
Fluid Temperature ◽  
Governing Equations ◽  
Waxy Crude Oil ◽  
Waxy Crude ◽  
Oil Pipeline ◽  
Single Station ◽  
Oil Pipelines ◽  
Volume Method

A mathematical model is established for the preheating commissioning process of waxy crude oil pipelines. The governing equations are solved by the finite volume method and the finite difference method. Accordingly, numerical computations are made for the Niger crude oil pipeline and the Daqing-Tieling 3rd pipeline. The computational results agree well with the field test data. On this basis, fluid temperature in the process of the preheating commissioning is studied for single station-to-station pipeline. By comparing different preheating modes, it is found that the effect of forward preheating is the best. Under different preheating commissioning conditions, the optimal combination of outlet temperature and flow rate is given.

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