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Mechanistic Understanding of CO2 Corrosion Inhibition at Elevated Temperatures

Ding, Yuan
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1547122087551426

Abstract Details

2019, Doctor of Philosophy (PhD), Ohio University, Chemical Engineering (Engineering and Technology).
The mechanisms of corrosion inhibition of mild steel in high temperature and high pressure (HTHP) environments have been historically poorly understood. Due to its limited understanding, effective corrosion inhibition in HTHP wells is still very challenging. The purpose of this dissertation is to investigate the inhibition mechanisms of mild steel in the presence of two commonly used inhibitors (an imidazoline-type and a quaternary ammonium type (quat-type) inhibitor) at elevated temperatures. This comprehensive and systematic study provides insights on the selection of successful inhibition strategies at elevated temperatures. A series of experiments were first performed in a standard 2L glass cell at low to medium temperature (25C, 50C and 80C) to characterize adsorption kinetics over this temperature range, using the two selected inhibitors. These experiments included general corrosion inhibition tests using linear polarization resistance (LPR) measurements and direct determination of adsorption behavior using a quartz crystal microbalance (QCM). Both test methods yielded similar trends for the two inhibitors tested. This suggested that the loss of inhibition efficiency as temperature increased was a result of desorption being favored at higher temperatures. Novel high temperature corrosion inhibition tests were performed in a 4L autoclave specially designed to enable the injection of inhibitor under pressure, at elevated temperatures of 120C and 150C. In addition, the experimental setup and procedure were incrementally improved to minimize the formation of corrosion products and help identify the true effect of the inhibitors. For the imidazoline-type inhibitor, the inhibition efficiency continued to decrease with increasing temperature up to 120C and was completely masked by the rapid formation of Fe3O4 at 150C. The presence of Fe3O4 played a significant role on the corrosion inhibition at this temperature. The quat-type inhibitor completely lost its inhibition ability at temperatures above 80C. The formation of corrosion product controlled the corrosion rates at 120C and 150C, and the presence of inhibitor had little effect. Both inhibitors showed some degree of degradation at high temperature, although this could not explain, by itself, the observed decrease in performance. The results of this research highlighted the importance of considering the formation of corrosion products when developing inhibition strategy at elevated temperatures. The work also enabled the development of appropriate experimental setups and procedures to evaluate accurately inhibitor performances at high temperatures. This brought in a significant improvement in the understanding of corrosion inhibition at elevated temperatures, elucidating some aspects of inhibition performance that had been overlooked, and allowing better corrosion management strategies for high temperature applications.
Marc Singer (Advisor)
246 p.
Chemical Engineering
CO2 corrosion; corrosion inhibition; high temperature; Fe3O4; inhibition mechanisms

Recommended Citations

Citations

  • Ding, Y. (2019). Mechanistic Understanding of CO2 Corrosion Inhibition at Elevated Temperatures [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1547122087551426

    APA Style (7th edition)

  • Ding, Yuan. Mechanistic Understanding of CO2 Corrosion Inhibition at Elevated Temperatures. 2019. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1547122087551426.

    MLA Style (8th edition)

  • Ding, Yuan. "Mechanistic Understanding of CO2 Corrosion Inhibition at Elevated Temperatures." Doctoral dissertation, Ohio University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1547122087551426

    Chicago Manual of Style (17th edition)

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This open access ETD is published by Ohio University and OhioLINK.