Computer simulation of oil and gas flow line stress-strain behavior

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Flow lines are one of the key elements of oil field facilities as they ensure safe transport of raw multiphase mixtures of gas, oil and water from reservoir to reception facilities. The growth of oil extraction in Russia makes the issue of developing new deposits and maintaining high production of oil and gas from existing ones particularly important. Therefore, maintenance of flow lines in service is of great significance. Most of Russia’s oil production originates in West Siberia. The territory is characterized with considerable annual and daily fluctuations of temperature, high precipitation, and vast wetlands. A specific challenge is to maintain underground sections of pipeline constructed under severe climatic conditions. Pipeline failures and accidents operated under harsh climatic conditions are primarily induced by bending deformation accompanied with soil-pipe-fluid (gas) displacements. To prevent accidents that could be caused by excessive bending deformations, it is essential to analyze the impact of climatic conditions, soils, and operation parameters, as well as to reveal the most potentially dangerous pipeline sections. To detect the most dangerous sections, alongside with various technical tools and equipment, pipeline strength and stability are calculated. The following regulative documents that prescribe the procedure of underground pipeline strength calculation SNiP (construction rules and regulations) 2.05.06-85* “Transmission pipelines” (section 8.25), set of rules 34-116-97 “Instruction on oil and gas flow line design, construction, and repair” (section 8.1) state the requirements for simulating soil-pipe interaction. The search for new methods to calculate strain-stress behavior of underground pipelines is of particular importance as due to the great length of pipeline the increase in pipe wall thickness at least by 1 mm leads to significant overspend. It is worth noting that soil is not the only source of external load, but also serves as an environment where pipe deformations occur. At the same time, these documents do not explain the calculation procedure itself. The remaining time (RT) is estimated as the time over which defects accumulate until ultimate limit state is reached. As a rule, the procedure of RT calculation is not detailed. The calculations are done on the basis of formulas used for estimating facility life time according to the deterministic and probabilistic schemes. When using deterministic methods, the fixed data on fracture toughness, loads on pipelines and pipe defects are considered. The remaining time is predicted on the basis of safety coefficients (fracture resistance) and survivability. RT is defined as a moment when hypothetical cracks or cracks existing in the pipeline are in compliance with the safety requirements for the damaged system based on the criteria of fracture mechanics and survivability. To perform probability calculations, the reliability theory which rests on the statistic.

Original languageEnglish
Title of host publicationMicro and Nano Technologies, Space Technologies and Planetary Science
PublisherInternational Multidisciplinary Scientific Geoconference
Pages343-350
Number of pages8
Edition1.4
ISBN (Electronic)9786197408355, 9786197408362, 9786197408379, 9786197408386, 9786197408393, 9786197408409, 9786197408416, 9786197408423, 9786197408430, 9786197408447, 9786197408454, 9786197408461, 9786197408478, 9786197408485, 9786197408492, 9786197408508, 9786197408515, 9786197408522
ISBN (Print)9786197408355
DOIs
Publication statusPublished - 1 Jan 2018
Event18th International Multidisciplinary Scientific Geoconference, SGEM 2018 - Albena, Bulgaria
Duration: 2 Jul 20188 Jul 2018

Publication series

NameInternational Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM
Number1.4
Volume18
ISSN (Print)1314-2704

Conference

Conference18th International Multidisciplinary Scientific Geoconference, SGEM 2018
CountryBulgaria
CityAlbena
Period2.7.188.7.18

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Keywords

  • Pipe wall thickness
  • Strain
  • Stress calculation

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geology

Cite this

Burkov, P., Burkov, V., & Burkova, S. (2018). Computer simulation of oil and gas flow line stress-strain behavior. In Micro and Nano Technologies, Space Technologies and Planetary Science (1.4 ed., pp. 343-350). (International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM; Vol. 18, No. 1.4). International Multidisciplinary Scientific Geoconference. https://doi.org/10.5593/sgem2018/1.4/S06.045