Cailiao Baohu (Jul 2022)

Analysis of the Corrosion and Fracture of P110S Tubing in a Well of Tahe Oilfield

  • YANG Xin - yong, YAN Zhi - lun, LI Fang, JIN Wei, ZHANG Wei, GUO Yu - jie

DOI
https://doi.org/10.16577/j.issn.1001-1560.2022.0205
Journal volume & issue
Vol. 55, no. 7
pp. 222 – 226

Abstract

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In order to study the corrosion status and reasons of the sulfur - resistant tubings in Tahe oilfield and provide reasonable suggestions for tubing corrosion protection, the causes of corrosion failure of P110S tubing in a well were comprehensively analyzed by means of macro - morphological observation, physical and chemical property testing, metallographic structure analysis, scanning electron microscope observation and energy spectrum analysis based on field conditions. Results showed that the tubing’s chemical composition, mechanical properties and metallographic structure met API SPEC 5CT-2011 requirements, and a corrosion environment with high contents of CO2, Cl - and H2O was the main reason for the local corrosion of the inner wall of the tubing, which subsequently led to a serious thinning and fracture of the inner wall of the tubing. With the increase of the well depth, the service temperature of the tubing increased, and the corrosion degree of the tubing increased as well.

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