Comparison of Stress Corrosion Behavior of TP110TS and P110 Steel in a Simulated Annular Environment of CO2 Injection Well

doi:10.11902/1005.4537.2019.126

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (4): 302-308 DOI: 10.11902/1005.4537.2019.126

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Comparison of Stress Corrosion Behavior of TP110TS and P110 Steel in a Simulated Annular Environment of CO₂ Injection Well

LI Qing¹^,², ZHANG Deping¹^,², LI Xiaorong³, WANG Wei⁴, SUN Baozhuang⁵(

), AI Chi¹(

)

1. Northeast Petroleum University Oil and Gas Well Engineering College, Daqing 163318, China
2. Carbon Dioxide Development Company, Jilin Oil Field Company, Songyuan 138000, China
3. Tianjin Dagang Oilfield Group Engineering Construction Co. Ltd. , Tianjin 300280, China
4. Oil and Gas Engineering Research Institute, PetroChina Jilin Oilfield Company, Songyuan 138000, China
5. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China

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Abstract

The stress corrosion cracking behavior of two oil casing steels TP110TS and P110 in a simulated solution in the annulus space of CO₂ injection wells was comparatively studied by U-bend specimen immersion test and electrochemical test. The results show that TP110TS steel and P110 steel have certain degree of stress corrosion sensitivity in the solution (large amount of CO₂ and micro H₂S), and the stress corrosion mechanism is the synergistic mechanism of anodic dissolution (AD) and hydrogen embrittlement (HE). In the CO₂-H₂S environment, the concentration of imidazoline corrosion inhibitor has different effect on the stress corrosion of oil casing steels TP110TS and P110. Adding sufficient corrosion inhibitor has a good inhibitory effect on the stress corrosion behavior of P110 steel. However, when the added amount is insufficient, the corrosion inhibitor increases the stress corrosion tendency of P110 steel. The stress corrosion sensitivity of TP110TS steel decreases with the increase of corrosion inhibitor concentration. It follows that TP110TS is more suitable for the CO₂-H₂S environment where corrosion inhibitors are added.

Key words: TP110TS steel P110 steel annulus environment stress corrosion CO₂ injection well

Received: 23 August 2019

ZTFLH:

TG174.42

Fund: National Key Oil Program of China(2016ZX05016002)

Corresponding Authors: SUN Baozhuang,AI Chi E-mail: sunbaoz9406@163.com;aichi2001@163.com

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Cite this article:

LI Qing, ZHANG Deping, LI Xiaorong, WANG Wei, SUN Baozhuang, AI Chi. Comparison of Stress Corrosion Behavior of TP110TS and P110 Steel in a Simulated Annular Environment of CO₂ Injection Well. Journal of Chinese Society for Corrosion and protection, 2020, 40(4): 302-308.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.126 OR https://www.jcscp.org/EN/Y2020/V40/I4/302

Table 1 Chemical compositions of TP110TS and P110 tubing steels (mass fraction / %)

Fig.1 Metallographic structures of P110 (a) and TP110TS (b) tubing steels

Fig.2 Macroscopic morphologies of TP110TS (a, c) and P110 (b, d) steels after immersion for 720 h in simulated solutions without (a, b) and with 1 g/L (c, d) corrosion inhibitor

Table 2 Comparison of corrosion and cracking of TP110TS and P110 steels after U-bend corrosion in simulated solutions with different concentrations of inhibitor

Fig.3 Micromorphologies of P110 (a~c) and TP110TS (d~f) steels after immersion for 720 h in simulated solutions with 0 g/L (a, d), 0.4 g/L (b, e) and 1 g/L (c, f) inhibitor and then removal of corrosion products

Fig.4 Polarization curves of TP110TS and P110 steels in simulated solutions with different concentrations of inhibitor

Table 3 Fitting results of polarization curves for TP110TS and P110 steels in simulated solutions with different concentrations of inhibitor

Fig.5 Electrochemical impedance spectroscopies of TP110TS and P110 steels in simulated solutions with different concentrations of inhibitor

Fig.6 Equivalent circuit for fitting EIS of TP110TS and P110 steels in simulated solutions with different concentrations of inhibitor

Table 4 Fitting results of EIS of TP110TS and P110 steels

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