Prediction of Tubing String Corrosion Rate in CO2-injection Production Wells

doi:10.11885/j.issn.1674-5086.2018.06.07.01

Abstract

Abstract: The pattern of tubing corrosion in different stages in CO₂ production wells was investigated from the viewpoint of the phenomenon of tubing string corrosion. Moreover, the progression of CO₂ corrosion in the tubing string is summarized. Based on kinetic principles and the theory of electrochemical corrosion of metals, factors such as the liquid production, water cut, wellhead temperature, production pressure difference, and fluid flow rate were considered. Further, the internal temperature and pressure distribution of the tubing were obtained, and methods for predicting the corrosion rate in CO₂ production well tubing were investigated. The corrosion rates of the tubing string in actual wells were predicted, and the pattern of variation in the tubing string corrosion rate with the time and depth was investigated under the principal control factors. The results show that tubing corrosion occurs primarily in the production stage throughout the throughput cycle. The prediction results of corrosion conditions are in good agreement with the corrosion conditions measured in the field.

Key words: tubing string, CO₂ corrosion, prediction model, corrosion rate, throughput cycle

CLC Number:

TE983
O646.6

ZHANG Zhi, LIU Jinming, ZHANG Huali, LI Yufei, LUO Wei. Prediction of Tubing String Corrosion Rate in CO₂-injection Production Wells[J]. 西南石油大学学报(自然科学版), 2019, 41(2): 175-184.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2018.06.07.01

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Prediction of Tubing String Corrosion Rate in CO₂-injection Production Wells

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