Skip to Main Content
 

Global Search Box

 
 
 

ETD Abstract Container

Abstract Header

The Effect of Oxygen in Sweet Corrosion of Carbon Steel for Enhanced Oil Recovery Applications

Rosli, Nor Roslina
http://orcid.org/0000-0002-2080-9814
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1448974434

Abstract Details

2015, Doctor of Philosophy (PhD), Ohio University, Chemical Engineering (Engineering and Technology).
The primary objective of this work is to investigate the corrosion behavior of carbon steel in simulated CO2-EOR environments when O2 is present in the CO2 supply. A preliminary study was first conducted at low pressure to investigate the effect of O2 on the protectiveness of iron carbonate (FeCO3) corrosion product layers in mild steel CO2 corrosion. Carbon steel (UNS G10180) samples were immersed in a CO2 saturated 1 wt.% NaCl electrolyte for 2 days to facilitate formation of a protective FeCO3 layer on the steel surface. Temperature and pH were maintained at 80°C and 6.6, then 1 ppm O2 was introduced to the electrolyte. The impact of the oxidant(s) was studied after samples were exposed for one week to test conditions. Electrochemical measurements indicated increased corrosion rates over the first two days of O2 exposure, with a decrease in corrosion rate thereafter due to corrosion product formation that conferred some degree of protection to the steel surface. When O2 was introduced after carbonate formation, the corrosion rate did not increase. Although the final corrosion rates of all tests were relatively low (less than 0.2 mm/y), localized corrosion was observed. Surface analysis showed attack of iron carbonate crystals and formation of iron (III) oxides. This degradation of initially formed FeCO3 occurred concurrently with the development of localized corrosion features as deep as 80 µm. High pressure experiments were then conducted at CO2-EOR simulated downhole conditions. The effect of O2 (4 vol. %) on the corrosion performance of mild steel (UNS G10180) in CO2-saturated brine was investigated using a 4-liter autoclave at two different temperatures (25 and 80°C) and pressures (40 and 90 bar). Experiments at 25°C are categorized as `FeCO3-free’ while experiments at 80°C are termed `FeCO3-forming’. The work included electrochemical measurements, weight loss determination, and characterization of the corrosion products. Severe corrosion was observed on the steel specimen after 48 hours of exposure to the corrosive environments. Tests at FeCO3-forming conditions exhibited localized corrosion, while the FeCO3-free experiments displayed severe general corrosion. Corrosion prediction using Multicorp© software was performed and the output corrosion rate data were compared against experimental results. Reasonable correlation was observed with the experimental data in anoxic conditions.
Srdjan Nesic (Advisor)
Yoon-Seok Choi (Committee Member)
John Staser (Committee Member)
Michael Jensen (Committee Member)
Dina Lopez (Committee Member)
197 p.
Chemical Engineering
corrosion; carbon dioxide; oxygen; carbon steel; high preesure; EOR

Recommended Citations

Citations

  • Rosli, N. R. (2015). The Effect of Oxygen in Sweet Corrosion of Carbon Steel for Enhanced Oil Recovery Applications [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1448974434

    APA Style (7th edition)

  • Rosli, Nor Roslina. The Effect of Oxygen in Sweet Corrosion of Carbon Steel for Enhanced Oil Recovery Applications. 2015. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1448974434.

    MLA Style (8th edition)

  • Rosli, Nor Roslina. "The Effect of Oxygen in Sweet Corrosion of Carbon Steel for Enhanced Oil Recovery Applications." Doctoral dissertation, Ohio University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1448974434

    Chicago Manual of Style (17th edition)

ohiou1448974434
3,949
© 2015, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.