Influence factors on stress corrosion cracking of P110 tubing steel under CO₂ injection well annulus environment

Abstract

Stress corrosion cracking (SCC) behavior of P110 tubing steel in simulated CO₂ injection well annulus environments was investigated through three-point bent tests, potentiodynamic polarization and EIS measurements. The results demonstrate that SCC of P110 tubing steel could occur in acidulous simulated environment, and the sensitivity of SCC increases with the decrease of pH, as well as increase of sulfide concentration and total environmental pressure. Both anodic dissolution and hydrogen embrittlement make contributions to the SCC. Adequate concentration of corrosion inhibitor can inhibit the occurrence of SCC on account of the inhibition of localized anodic dissolution and cathodic hydrogen evolution.

Keywords

P110 tubing steel / stress corrosion cracking / annulus environment / CO₂ flooding

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