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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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