Work

Prediction of Corrosion Remaining Life of Completion Tubing in High-Sour-Gas Wells

Year: 2025

Type: article

Abstract: In high-sulfur environments, the failure risk of completion tubing increases due to the coupling effect of mechanical and electrochemical corrosion during the acidification production process. The corrosion behavior of P110SS tubing steel was investigated by an HTHP corrosion weight loss experiment and an electrochemical corrosion experiment. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were used to analyze the surface morphology of the corrosion products. In addition, a prediction model for the remaining service life of completion tubing under the synergistic effect of corrosion and stress was established during the acidification production process. The results show that acidification operations have a significant impact on the subsequent service life of tubing; the corrosion rate of P110SS tubing in the full acidification production process is much higher than that after the produced gas field solution corrosion treatment alone. Obvious pitting marks, micropores, and microchannels are observed in the corrosion product film of P110SS steel after acidification treatment, and the corrosion product film structure of P110SS steel is loose and honeycomb-like after acidification production treatment. The corrosion products are mainly FexSy and FeCO3 after acidification production corrosion treatment. The corrosion during the acidification production stage is controlled by cathodic polarization. The remaining service life of tubing after production corrosion treatment can reach up to 29 years, while the remaining service life of tubing after acidification production corrosion treatment is significantly reduced, with a maximum of only 8 years. The research results have guiding significance for the selection, optimization, and design of high-sulfur-gas well tubing.

Source: Processes

DOI: 10.3390/pr13113569

Authors: Naiyan Zhang, Yufei Li, Geng Tang, Hao Gong, Dajiang Zhu, Qiyao He

Institutions: Southwest Petroleum University, State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, PetroChina Southwest Oil and Gas Field Company (China), China National Petroleum Corporation (China)

Language: English

Topic: Corrosion Behavior and Inhibition

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,896

Funders: National Natural Science Foundation of China, National Science and Technology Major Project