Finite element study on residual internal pressure strength of corroded oil pipes and prediction method for remaining life

Abstract

Purpose This study aims to provide a theoretical basis to evaluate the suitability and integrity of corrosion pipes. Design/methodology/approach The three-dimensional models of the P110S oil pipe with local corrosion damage, general corrosion damage, pitting corrosion damage are established based on the API 579 standard using the nonlinear finite element analysis method for parametric research. Findings The reliability of the model is verified based on the experimental data from the existing literature. The effects of the oil pipe’s size and the corrosion damage’s type on the residual internal pressure strength are simulated and obtained. What’s more, a basic method for predicting the remaining life of corrosion damaged pipes is proposed. Originality/value The authors evaluated the residual strength of various corroded tubing, compared the tubing with different corrosion types and proposed a basic method for predicting the remaining life of the corroded tubing from the corrosion depth.

Residual strength of a casing with corrosion semi-ellipsoid defect in high-sulfur gas wells

“…Currently, the research based on numerical simulation on residual strength of defective casing pipe with bending moment is rare [10][11][12]. The nonlinear finite element method is usually used to evaluate the equivalent stress distribution of defective casing [13].…”

Failure Analysis of Cracked and Corroded Tubings in Sudong Block of Changqing Oilfield

“…Therefore, the common and interactive effects of various factors in the string service environment aggravate the corrosion of oil casing [2,3]. However, severe corrosion will lead to tube wall thinning, which directly affects the load bearing capacity of the string [4]. Especially with the increasing of well water content in the middle and later stages, the synergistic effect of erosive gas and Clenvironment leads to intensified corrosion, and the failure of string becomes more and more prominent [5,6].…”