Improvement of the toolset for diagnosing underground pipelines of oil and gas enterprises considering changes in internal working pressure

Authors

DOI:

https://doi.org/10.15587/1729-4061.2019.184247

Keywords:

underground pipelines, oil and gas enterprises, mechanical stresses, hydrostatic pressure, corrosion currents, crack opening

Abstract

A new criterion of strength and a set of informative parameters have been devised for modelling the stressed-strained state (SSS) of the underground metal pipeline (UMP) taking into consideration the system of defects of the cavity type, atop of which there is a crack.

We have inspected the surface of pipes made from structural carbon steel 20, which are exposed to the internal hydrostatic pressure. It has been proposed that the strength criterion of a pipe's metal, which is in contact with the soil electrolyte, should take into consideration the stages of elastic and plastic deformation.

The strength criterion has been supplemented with ratios for a corrosion current (the Kaesche type) and internal pressure, which acts on a cylindrical pipe, taking into consideration the inelastic energy characteristic of the surface layer.

For a pipeline, in a neutral soil environment, we have measured polarization potentials and corrosion currents using the PPM (polarization capacity meter) and CCM (contactless current meter) equipment. Results measure respective defects of the cavity type (pitting), formed at the outer surface of an underground pipeline.

For five variants of internal pressure pi=5.5¸7.5 MPa, the CCM and PPM devices determined  currents and voltages for characteristic surface defects and, based on them, we have estimated the effective time it takes for a crack to reach critical depth (a pipe resource), as well as the reliability parameter b (a safety characteristic).

By comparing results from experimental study and appropriate calculations it has been established that the relative changes in the rate of corrosion Vcor is 2.8 times, and, accordingly, the UMP resource parameter tR is 3.1 times, larger, while the reliability parameter b is 6.9 times less, than the relative changes in internal pressure changes pT.

Based on analysis of the parameter tR, which characterizes the UMP resource, it has been found that this dependence tR on internal pressure pT is nonlinear and tends to saturation.

The specified information is important for improving the methods of control over UMP at oil and gas enterprises, specifically, procedures for correct estimation of anode current density in metal defects at the outer surface of an underground pipeline, taking into consideration changes in internal hydrostatic pressure

Author Biographies

Larysa Yuzevych, Lviv University of Business and Law Kulparkіvska str., 99, Lviv, Ukraine, 79021

PhD, Lecturer

Department of Business Economy and Information Technology

Larysa Yankovska, Lviv University of Business and Law Kulparkіvska str., 99, Lviv, Ukraine, 79021

Doctor of Economic Sciences, Professor

Department of Finance, Banking and Insurance

Lyubomyr Sopilnyk, Lviv University of Business and Law Kulparkіvska str., 99, Lviv, Ukraine, 79021

Doctor of Technical Sciences, Professor, Honored Inventor of Ukraine

Department of Administrative Law and Process, Financial and Information Law

Volodymyr Yuzevych, Karpenko Physico-mechanical Institute of the NAS of Ukraine Naukova str., 5, Lviv, Ukraine, 79601

Doctor of Physical and Mathematical Sciences, Professor

Department of Electrophysical Methods of Non-Destructive Testing

Ruslan Skrynkovskyy, Lviv University of Business and Law Kulparkіvska str., 99, Lviv, Ukraine, 79021

PhD, Associate Professor, Professor

Department of Business Economy and Information Technology

Bohdan Koman, Ivan Franko National University of Lviv Universytetska str., 1, Lvіv, Ukraine, 79000

Doctor of Physical and Mathematical Sciences, Professor

Department of System Design

Lyudmila Yasinska-Damri, Ukrainian Academy of Printing Pid Holoskom str., 19, Lviv, Ukraine, 79020

PhD, Associate Professor

Department of Engineering Mechanics

Nellі Heorhiadi, Lviv Polytechnic National University S. Bandery str., 12, Lvіv, Ukraine, 79013

Doctor of Economic Sciences, Professor

Department of Management and International Business

Roman Dzhala, Karpenko Physico-mechanical Institute of the NAS of Ukraine Naukova str., 5, Lviv, Ukraine, 79601

Doctor of Technical Sciences, Head of Department

Department of Electrophysical Methods of Non-Destructive Testing

Mykhailo Yasinskyi, Ukrainian Academy of Printing Pid Holoskom str., 19, Lviv, Ukraine, 79020

PhD, Associate Professor

Department of Engineering Mechanics

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Published

2019-11-19

How to Cite

Yuzevych, L., Yankovska, L., Sopilnyk, L., Yuzevych, V., Skrynkovskyy, R., Koman, B., Yasinska-Damri, L., Heorhiadi, N., Dzhala, R., & Yasinskyi, M. (2019). Improvement of the toolset for diagnosing underground pipelines of oil and gas enterprises considering changes in internal working pressure. Eastern-European Journal of Enterprise Technologies, 6(5 (102), 23–29. https://doi.org/10.15587/1729-4061.2019.184247

Issue

Vol. 6 No. 5 (102) (2019): Applied physics

Section

Applied physics

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Copyright (c) 2019 Larysa Yuzevych, Larysa Yankovska, Lyubomyr Sopilnyk, Volodymyr Yuzevych, Ruslan Skrynkovskyy, Bohdan Koman, Lyudmila Yasinska-Damri, Nellі Heorhiadi, Roman Dzhala, Mykhailo Yasinskyi

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