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51312-01411-CORROSION ASSESSMENT IN KARAN GAS FIELD DEVELOPMENT

Picture for CORROSION ASSESSMENT IN KARAN GAS FIELD DEVELOPMENT
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Product Number: 51312-01411-SG
ISBN: 01411 2012 CP
Author: Marc Singer
Publication Date: 2012
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A new offshore gas export pipeline is expected to produce a large quantity of natural gas but absolutely no condensate. The water production rate is however projected to be significant and the presence of CO2 (8%) and H2S (4%) will lead to aggressive corrosion environments. Different inhibition techniques will be implemented to control the bottom of the line corrosion. Top of the line corrosion is also identified as a potential issue in specific locations in the field as large quantities of organic acids are present in the produced water. This paper presents a comprehensive assessment of the corrosion risk through laboratory simulations performed in large scale flow loop and in a specially designed autoclave equipped for corrosion studies under dewing conditions. Corrosion rates are obtained through weight loss samples and the surface scale is analysed with XRD (Xray diffraction) EDS (Energy Dispersive Spectroscopy) and SEM (Scanning Electron Microscopy). The TLC rate was found to be low in all conditions tested and no trace of localized corrosion was observed. Mackinawite cubic iron sulfide and troilite were identified in the corrosion product layer. The results are used to guide the required corrosion management measures which are presented as well.
A new offshore gas export pipeline is expected to produce a large quantity of natural gas but absolutely no condensate. The water production rate is however projected to be significant and the presence of CO2 (8%) and H2S (4%) will lead to aggressive corrosion environments. Different inhibition techniques will be implemented to control the bottom of the line corrosion. Top of the line corrosion is also identified as a potential issue in specific locations in the field as large quantities of organic acids are present in the produced water. This paper presents a comprehensive assessment of the corrosion risk through laboratory simulations performed in large scale flow loop and in a specially designed autoclave equipped for corrosion studies under dewing conditions. Corrosion rates are obtained through weight loss samples and the surface scale is analysed with XRD (Xray diffraction) EDS (Energy Dispersive Spectroscopy) and SEM (Scanning Electron Microscopy). The TLC rate was found to be low in all conditions tested and no trace of localized corrosion was observed. Mackinawite cubic iron sulfide and troilite were identified in the corrosion product layer. The results are used to guide the required corrosion management measures which are presented as well.
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