Corrosion Behavior of L245 Steel in Simulated Oilfield Produced Water at Different Temperatures

doi:10.11902/1005.4537.2016.151

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (3): 300-304 DOI: 10.11902/1005.4537.2016.151

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Corrosion Behavior of L245 Steel in Simulated Oilfield Produced Water at Different Temperatures

Ming ZHU(

),Yong YU,Huihui ZHANG

College of Materials Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China

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Abstract

The corrosion behavior of L245 steel in simulated oilfield produced water was investigated by means of weight loss measurement, polarization curve measurement, electrochemical impedance spectra (EIS) and SEM. The results showed that the corrosion reaction of L245 steel is more intensive at higher temperature. When the temperature of the solution is elevated from 30 ℃ to 90 ℃, the corrosion current density of L245 steel in the solution with saturated CO₂ increases from 66.1 μAcm^-2 to 177 μAcm^-2 while the charge transfer resistance of L245 steel decreased from 5155 Ωcm² to 1182 Ωcm². The above results indicated that the corrosivity of oilfield produced water increased with the increasing temperature within the range of 30~90 ℃, localized corrosion of the steel occurred at 60 ℃, then the localized corrosion would be intensified when the temperature is elevated to 90 ℃.

Key words: L245 steel simulated oilfield water temperature corrosion rate

Received: 09 September 2016

Fund: Supported by National Natural Science Foundation of China (51201131), Cultivation Fund of Xi’an University of Science and Technology (6310214005) and Doctoral Promoter Fund of Xi’an University of Science and Technology (6310115012)

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Cite this article:

Ming ZHU,Yong YU,Huihui ZHANG. Corrosion Behavior of L245 Steel in Simulated Oilfield Produced Water at Different Temperatures. Journal of Chinese Society for Corrosion and protection, 2017, 37(3): 300-304.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.151 OR https://www.jcscp.org/EN/Y2017/V37/I3/300

Fig.1 Corrosion rates of L245 steel after immersed in simulated oilfield produced water with different temperatures for 10 d

Fig.2 Polarization curves of L245 steel in oilfield produced water with different temperatures

Fig.3 Nyquist (a) and Bode (b) diagrams of L245 steel in simulated oilfield produced water with different temperatures

Fig.4 Electrochemical equivalent circuits used for modeling of EIS of L245 steel in simulated oilfield produced water with different temperatures

Table 1 Polarization curves fitting results of L245 carbon steel at different temperatures in simulated oilfield produced water

Table 2 Electrochemical parameters fitted from the EIS at different temperature

Fig.5 SEM images of L245 steel after immersion in simulated oilfield produced water for 10 d at 30 ℃ (a),60 ℃ (b) and 90 ℃ (c)

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