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Effective Corrosion Inhibitor Formulation for Carbon Steel in Downhole Sweet Gas Wells

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Corrosion of the internal surfaces of pipelines is one of the serious issues facing the oil and gas industry. Produced oil and gas always contain some water mixed with brines and contain varying amounts of carbon dioxide (sweet gas), hydrogen sulfide (sour gas) and organic acids1. All of these can affect the integrity of the low-carbon steel pipes used in the construction of downhole gas wells. CO2 gas, along with the high salt content of production water, causes serious corrosion on the internal walls of corrosion resistance alloys (CRAs) and steel pipelines used in downhole gas wells.

Product Number: 51323-19009-SG
Author: Ime Bassey Obot, Ahmad A. Sorour, Tao Chen, Qiwei Wang
Publication Date: 2023
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$20.00
$20.00

Corrosion of the internal surfaces of pipelines is one of the serious corrosion issues facing the oil and gas industry. Produced oil and gas always contain water mixed with brines and varying amounts of carbon dioxide (sweet gas), hydrogen sulfide (sour gas) and organic acids. All of these can affect the integrity of the low-carbon steel pipes. Corrosion Inhibitors have become one of the best practical methods to mitigate internal corrosion damage, especially in downhole gas wells. In the present study, we developed a corrosion inhibitor formulation, abbreviated NAM-4 based on cost effective chemistries for use in downhole sweet gas wells. The corrosion inhibition performance of NAM-4 for C1018 carbon steel in CO2 saturated 3.5% NaCl brine was investigated. The efficiency of the inhibitor formulation was investigated at different inhibitor concentrations (25, 50, 75, 100, 125 ppm), test duration (6-72 h), and temperatures (30-80oC) using linear polarization resistance (LPR) and potentiodynamic polarization (PDP) measurements. The post-immersion surface characterization of the exposed C1018 carbon steel with and without NAM-4 was carried out using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The excellent corrosion inhibition efficiency (> 97 %) was obtained at a very low concentration of 50 ppm, indicating the ability of NAM-4 to significantly protect the carbon steel against sweet (carbon dioxide) corrosion. The significance of this study is the possibility of replacing conventional toxic corrosion inhibitor formulations with cost effective ones for use in oilfield applications.

Corrosion of the internal surfaces of pipelines is one of the serious corrosion issues facing the oil and gas industry. Produced oil and gas always contain water mixed with brines and varying amounts of carbon dioxide (sweet gas), hydrogen sulfide (sour gas) and organic acids. All of these can affect the integrity of the low-carbon steel pipes. Corrosion Inhibitors have become one of the best practical methods to mitigate internal corrosion damage, especially in downhole gas wells. In the present study, we developed a corrosion inhibitor formulation, abbreviated NAM-4 based on cost effective chemistries for use in downhole sweet gas wells. The corrosion inhibition performance of NAM-4 for C1018 carbon steel in CO2 saturated 3.5% NaCl brine was investigated. The efficiency of the inhibitor formulation was investigated at different inhibitor concentrations (25, 50, 75, 100, 125 ppm), test duration (6-72 h), and temperatures (30-80oC) using linear polarization resistance (LPR) and potentiodynamic polarization (PDP) measurements. The post-immersion surface characterization of the exposed C1018 carbon steel with and without NAM-4 was carried out using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The excellent corrosion inhibition efficiency (> 97 %) was obtained at a very low concentration of 50 ppm, indicating the ability of NAM-4 to significantly protect the carbon steel against sweet (carbon dioxide) corrosion. The significance of this study is the possibility of replacing conventional toxic corrosion inhibitor formulations with cost effective ones for use in oilfield applications.

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Economically Mitigating Downhole Corrosion and Wear Failures with Thermoplastic Liners

Product Number: 51317--8878-SG
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Addressing Integrity Issues in Downhole Equipment by Corrosion Inhibition in Sweet Geothermal Brines

Product Number: 51319-13364-SG
Author: Helmuth Sarmiento Klapper
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Geothermal resources have been successfully used in the Netherlands for heating districts in agriculture. Due to the high chloride content and the presence of carbon dioxide in some of the geothermal fluids in combination with the intrinsic elevated temperatures these production environments represent a considerable challenge for the integrity of the technical equipment in the geothermal plant. Localized corrosion damage in downhole equipment reported by several operators confirmed the need for a corrosion strategy to mitigate the impact of the aggressiveness of the geothermal fluid under the current operational conditions. To address this a corrosion inhibitor was characterized in the laboratory using a rotating cage to simulate high temperature and high shear stress conditions. Based on the positive outcome of these tests the corrosion inhibitor was successfully implemented in the field. This paper documents the corrosion damage observed in downhole equipment before the use of corrosion inhibition the obtained laboratory test results as well as the experiences from monitoring the field performance of the corrosion inhibitor in this geothermal demanding application.
Picture for Downhole Sour Corrosion And Scale Deposition In Oil Wells
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Downhole Sour Corrosion And Scale Deposition In Oil Wells

Product Number: 51322-17694-SG
Author: Tao Chen, Frank Chang, Feng Liang, Steven Hochanadel
Publication Date: 2022
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Sour corrosion and iron sulphide scale deposition are two common flow assurance issues encountered in oilfields. Sour oil wells typically produce crude along with produced water and a significant amount of acidic gases such as carbon dioxide and hydrogen sulfide. The high pressure and temperature conditions under the downhole tend to cause severe corrosion damage including metal loss and pitting, along with iron sulphide scale deposition. Iron sulfide deposition in sour wells is a corrosion induced scale problem. It potentially causes production decline, restricted well intervention, well shutdown, or even severe consequences towards to the abandoned wells.
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