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Title: Assessing the effect of cement-steel interface on well casing corrosion in aqueous CO2 environments

Abstract

CO{sub 2} leakage is a critical safety concern for geologic storage. In wellbore environments, important leakage paths include the rock-cement and cement-casing interfaces. If the cement-casing interface is filled with escaping CO{sub 2}, the well casing directly contacts the CO{sub 2}. This can cause severe corrosion in the presence of water. This paper studies the effect of steel-cement interface gaps, ranging from 1 mm to 0 um, on casing corrosion. Corrosion kinetics were measured employing electrochemical techniques including linear polarization resistance, open circuit potential and electrochemical impedance spectroscopy. The experimental results showed that the corrosion of steel is not significant where the gap between steel and cement is small ({le} 100 {micro}m). Corrosion rates are controlled by the diffusion of corrosive species (H{sub 2}CO{sub 3} and H{sup +}) along the interface. In contrast, steel corrosion is severe in a broad gap where the corrosion process is limited only by the reaction kinetics of steel and corrosive species. The threshold leading to severe corrosion in terms of the cement-steel interface size (100 {micro}m) was determined. Our research clarifies a corrosion scenario at the cement-steel interface. Casing steel corrosion is initiated when attacked by corrosive species at the cement-steel interface. For relativelymore » tight interfaces, this results in a slow thinning of the casing and expansion of the interface width. If the gap increases beyond the critical threshold size, the corrosion rate increases significantly, and a potentially damaging cycle of corrosion and interface expansion is developed.« less

Authors:
 [1];  [1];  [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1009543
Report Number(s):
LA-UR-10-02608; LA-UR-10-2608
TRN: US201106%%975
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: 9th Annual Conference on Carbon Capture & Sequestration ; May 10, 2010 ; Pittsburg, PA
Country of Publication:
United States
Language:
English
Subject:
58; CARBON; CARBON DIOXIDE; CEMENTS; CORROSION; DIFFUSION; ELECTROCHEMISTRY; IMPEDANCE; KINETICS; POLARIZATION; REACTION KINETICS; SAFETY; SPECTROSCOPY; STEELS; STORAGE; WATER; WELL CASINGS

Citation Formats

Han, Jiabin, Carey, James W, and Zhang, Jinsuo. Assessing the effect of cement-steel interface on well casing corrosion in aqueous CO2 environments. United States: N. p., 2010. Web.
Han, Jiabin, Carey, James W, & Zhang, Jinsuo. Assessing the effect of cement-steel interface on well casing corrosion in aqueous CO2 environments. United States.
Han, Jiabin, Carey, James W, and Zhang, Jinsuo. Fri . "Assessing the effect of cement-steel interface on well casing corrosion in aqueous CO2 environments". United States. https://www.osti.gov/servlets/purl/1009543.
@article{osti_1009543,
title = {Assessing the effect of cement-steel interface on well casing corrosion in aqueous CO2 environments},
author = {Han, Jiabin and Carey, James W and Zhang, Jinsuo},
abstractNote = {CO{sub 2} leakage is a critical safety concern for geologic storage. In wellbore environments, important leakage paths include the rock-cement and cement-casing interfaces. If the cement-casing interface is filled with escaping CO{sub 2}, the well casing directly contacts the CO{sub 2}. This can cause severe corrosion in the presence of water. This paper studies the effect of steel-cement interface gaps, ranging from 1 mm to 0 um, on casing corrosion. Corrosion kinetics were measured employing electrochemical techniques including linear polarization resistance, open circuit potential and electrochemical impedance spectroscopy. The experimental results showed that the corrosion of steel is not significant where the gap between steel and cement is small ({le} 100 {micro}m). Corrosion rates are controlled by the diffusion of corrosive species (H{sub 2}CO{sub 3} and H{sup +}) along the interface. In contrast, steel corrosion is severe in a broad gap where the corrosion process is limited only by the reaction kinetics of steel and corrosive species. The threshold leading to severe corrosion in terms of the cement-steel interface size (100 {micro}m) was determined. Our research clarifies a corrosion scenario at the cement-steel interface. Casing steel corrosion is initiated when attacked by corrosive species at the cement-steel interface. For relatively tight interfaces, this results in a slow thinning of the casing and expansion of the interface width. If the gap increases beyond the critical threshold size, the corrosion rate increases significantly, and a potentially damaging cycle of corrosion and interface expansion is developed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {1}
}

Conference:
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