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51315-6090-Development of Alternate Sour Corrosion Inhibitor for Severe Sour Condition and Its Performance

Picture for Development of Alternate Sour Corrosion Inhibitor for Severe Sour Condition and Its Performance
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Product Number: 51315-6090-SG
ISBN: 6090 2015 CP
Author: Pulikesi Murugan
Publication Date: 2015
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Crude oil and natural gas can contain varying ratios of acid gases which are extremely corrosive to metal surfaces. Because of its corrosiveness sour gas production may require specialized production equipment such as inconel metallurgy to mitigate the severe environment hence the control of sour corrosion is a major concern in the oil and gas industry today. Currently most sour corrosion inhibitors are based on Alkyl Pyridine (AP) chemistries and typical treatment rates for critical sour environments range from 200-1000 ppm based on brine production.The objective of this work is to develop an alternative sour corrosion inhibitor to replace alkyl pyridine formulations. This paper will also investigate the effect of different operating parameters such as temperature (30 50 80 and 120 oC) salinity (low medium and high) H2S composition (10% 20% and 35%) CO2 composition (4% and 10%) and brine to oil ratio (90:10 70:30 50:50). Corrosion testing was performed using a modified ASTM G170 method. (Standard Guide for Evaluating and Qualifying Oilfield and Refinery Corrosion Inhibitors in the Laboratory)Weatherford Engineered Chemistry has developed a non-alkyl pyridine corrosion inhibitor formulation to prevent corrosion in critical sour systems. It was found that the corrosion rates for these operating conditions ranged from 30-50 mpy with varying degrees of pitting. Treatment ranges of 200-300ppm of our corrosion inhibitor showed excellent reduction in both water and gas phase corrosion rates. This was supported by corrosion rates of less than 3 mpy and no observed pits.
Crude oil and natural gas can contain varying ratios of acid gases which are extremely corrosive to metal surfaces. Because of its corrosiveness sour gas production may require specialized production equipment such as inconel metallurgy to mitigate the severe environment hence the control of sour corrosion is a major concern in the oil and gas industry today. Currently most sour corrosion inhibitors are based on Alkyl Pyridine (AP) chemistries and typical treatment rates for critical sour environments range from 200-1000 ppm based on brine production.The objective of this work is to develop an alternative sour corrosion inhibitor to replace alkyl pyridine formulations. This paper will also investigate the effect of different operating parameters such as temperature (30 50 80 and 120 oC) salinity (low medium and high) H2S composition (10% 20% and 35%) CO2 composition (4% and 10%) and brine to oil ratio (90:10 70:30 50:50). Corrosion testing was performed using a modified ASTM G170 method. (Standard Guide for Evaluating and Qualifying Oilfield and Refinery Corrosion Inhibitors in the Laboratory)Weatherford Engineered Chemistry has developed a non-alkyl pyridine corrosion inhibitor formulation to prevent corrosion in critical sour systems. It was found that the corrosion rates for these operating conditions ranged from 30-50 mpy with varying degrees of pitting. Treatment ranges of 200-300ppm of our corrosion inhibitor showed excellent reduction in both water and gas phase corrosion rates. This was supported by corrosion rates of less than 3 mpy and no observed pits.
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Picture for 10278 A Parametric Study of Sour Corrosion of Carbon Steel
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10278 A Parametric Study of Sour Corrosion of Carbon Steel

Product Number: 51300-10278-SG
ISBN: 10278 2010 CP
Author: Wei Sun, Dylan V. Pugh, Stephen N. Smith, Shiun Ling, Jorge L. Pacheco and Robert J. Franco
Publication Date: 2010
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A parametric study of sour corrosion was conducted and is presented in this paper to provide a better understanding of corrosion in sour gas environments. Various parameters that are known to affect the corrosion rate were evaluated and their impacts on corrosion rate are discussed.

 
Picture for Corrosion of Carbon Steels in H?S Containing Alkaline Brines
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51315-6119-Corrosion of Carbon Steels in H2S Containing Alkaline Brines

Product Number: 51315-6119-SG
ISBN: 6119 2015 CP
Author: Serguei Lvov
Publication Date: 2015
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Picture for Iron Source in Sour Gas/Condensate Wells: Reservoir Fluids or Corrosion?
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Iron Source in Sour Gas/Condensate Wells: Reservoir Fluids or Corrosion?

Product Number: 51317--8998-SG
ISBN: 8998 2017 CP
Author: Giulia Verri
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In order to implement an effective iron scale mitigation strategy, operators first need to identify the main source of iron in the system. This work describes a method to predict the “maximum dissolved iron” (MDI) concentration in a reservoir/production system.

 
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