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     Research Journal of Applied Sciences, Engineering and Technology

Research Article   |   OPEN ACCESS

Modeling CO2-H2-S Corrosion of Tubular at Elevated Pressure and Temperature

Rida Elgaddafi, Ramadan Ahmed and Subhash Shah
University of Oklahoma, Sarkeys Energy Center, 100 Boyd St, Room 1180, Norman, OK 73019, USA
Research Journal of Applied Sciences, Engineering and Technology  2016  7:510-524
http://dx.doi.org/10.19026/rjaset.13.3011  |  © The Author(s) 2016
Received: November ‎11, ‎2015  |  Accepted: February ‎10, ‎2016  |  Published: October 05, 2016
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Abstract

This study is aimed at improving carbon steel corrosion prediction in CO2-H2S environment. Corrosion is one of the major challenges faced by the oil and gas industry. This is mainly because of corrosive nature of formation fluids. Often produced hydrocarbons are accompanied by brine containing acidic gases such as carbon dioxide and hydrogen sulfide. A number of CO2-H2S corrosion models have been developed to predict corrosion of carbon steel under low-pressure (partial pressures of CO2- and H2-S less than 12 and 30 bar, respectively) and low-temperature. These models overestimate corrosion rate at high-pressure and high-temperature (HPHT) due to the application of the Henry’s law in predicting solubility of CO2 and H2S in NaCl solution (brine) under HPHT. In this study, an improved corrosion model, which utilizes thermodynamic based gas solubility model, has been developed to predict concentration of corrosive gases (CO2 and H2S) in brine solution saturated with natural gas. The corrosion model is verified using experimental data available in the literature. Predominantly, model predictions show good agreement with corrosion rate measurements obtained under various conditions.

Keywords:

Corrosion, tubular, carbon dioxide , hydrogen sulfide , pressure , temperature,

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Competing interests

The authors have no competing interests.

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This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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ISSN (Online):  2040-7467
ISSN (Print):   2040-7459
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