Authors: BurkovP.V., BurkovV.P., Fat'yanovD.S., TimofeevV.Yu.

Title of the article: Studying the stress-strain state of oilfield pipelines exposed to rill corrosion

Year: 2018, Issue: 3, Pages: 5-12

Branch of knowledge: Earth sciences

Index UDK: 622.691.4:053:533.6(252.6)

DOI: 10.26730/1999-4125-2018-3-5-12

Abstract: The paper describes a number of numerical experiments studying the stress-strain state of the pipeline exposed to rill corrosion. The choice of software implementing the finite element method is justified for the numerical experiment. The chosen ANSYS system will allow us to perform numerical experiments with sufficient accuracy, and the results will have a high degree of reliability. The initial data for a number of numerical experiments are taken from the actual operating conditions of the pipeline and interpreted into data for calculation in the ANSYS system. The numerical experiment consists of the stages of creating a finite element model of the pipeline that was exposed to rill corrosion, creating a finite element grid on the finite element model of the pipeline, applying loads and setting boundary conditions. A number of numerical experiments were carried out with the change of the depth parameter of rill corrosion. As the result of numerical experiments, the diagrams have been obtained showing the distribution of equivalent stresses (stresses by Mises) on the finite element model of the pipeline. The resulting diagrams make it possible to identify the magnitude and localization of the maximum equivalent stresses, the location of stress concentrators. After the results of the experiment were processed, the distribution of equivalent stresses in pipelines with different depths of corrosion defect was ob-tained. This dependence allows us to determine the critical value of the wear depth caused by the rill corrosion for the considered pipeline.

Key words: pipeline rill corrosion ANSYS numerical experiment stress-strain state

CITE DOWNLOAD