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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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00170 WIRELINE WEAR RESISTANCE OF POLYMERIC CORROSION BARRIER COATINGS FOR DOWNHOLE APPLICATIONS

Product Number: 51300-00170-SG
ISBN: 00170 2000 CP
Author: N. Symonds, B. G. Mellor and R. J.K. Wood, S. Groves
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Microbiologically Induced Corrosion Observed During Downhole Corrosion Inhibitor Trial

Product Number: 51319-13544-SG
Author: Moavin Islam
Publication Date: 2019
$20.00

The environmental conditions during downhole crude oil production can be very corrosive to the tubing string due to the presence of acid gases such as CO2. H2S high water cut and a large concentration of dissolved salts. It is also well known that certain species of bacteria can exist downhole which can potentially cause microbiologically induced corrosion (MIC) damage. While corrosion failures of tubing material due to acid gases etc. are quite well documented in the literature instances of proven downhole MIC failures are rare.During recent field trials for downhole corrosion inhibitors by a leading Middle East oil producer conclusive evidence was obtained which showed that MIC attack can indeed take place under downhole production conditions. In support of the findings the present paper will provide sessile bacteria analysis data as well as photographic documentation of MIC damage on coupons that were exposed under downhole operating conditions.Key Words: Downhole corrosion Microbiologically Induced Corrosion Corrosion inhibitors
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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
$20.00

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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