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06173 INTEGRITY ASSESMENT AND MANAGEMENT OF A GAS PRODUCTION LINE WITH INTERNAL CORROSION IN A MATURE FIELD

Picture for 06173 INTEGRITY ASSESMENT AND MANAGEMENT OF A GAS
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Product Number: 51300-06173-SG
ISBN: 06173 2006 CP
Author: Damodaran Raghu, Bert Pots, Mong-Hang Nguyen and David Amacker
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Integrity assessment in ageing exploration and production infrastructure like gathering and flow lines is fast becoming an area of concern owing to the gas fields producing beyond their designed life. The progressive reduction in production flow rate with time magnifies the internal corrosion problems due to bacterial activity and under deposit attack seriously impacts the pipeline integrity. Thus the challenge in integrity management of gathering and flow lines is to accurately predict the internal corrosion rate, detect, size and locate areas of potential internal corrosion and pitting and carry out fitness for service to help enable adequate remediation for safe operation thereby helping to maximize the life cycle performance. This paper demonstrates a comprehensive methodology for integrity management of ageing gas production lines. The methods involve integration of internal corrosion predictions with intelligent pig data and fitness for service assessment. The remediation strategies are devised based on safety considerations and business needs and they involve a combination of corrosion inhibition, strategic repairs and line maintenance. The method is demonstrated through a case study on a 30 year old 16” Gas gathering line, where strategic repair/remediation allowed continued operation of the asset without curtailing production.

Key words: Ageing pipelines, Production, Asset Integrity
Integrity assessment in ageing exploration and production infrastructure like gathering and flow lines is fast becoming an area of concern owing to the gas fields producing beyond their designed life. The progressive reduction in production flow rate with time magnifies the internal corrosion problems due to bacterial activity and under deposit attack seriously impacts the pipeline integrity. Thus the challenge in integrity management of gathering and flow lines is to accurately predict the internal corrosion rate, detect, size and locate areas of potential internal corrosion and pitting and carry out fitness for service to help enable adequate remediation for safe operation thereby helping to maximize the life cycle performance. This paper demonstrates a comprehensive methodology for integrity management of ageing gas production lines. The methods involve integration of internal corrosion predictions with intelligent pig data and fitness for service assessment. The remediation strategies are devised based on safety considerations and business needs and they involve a combination of corrosion inhibition, strategic repairs and line maintenance. The method is demonstrated through a case study on a 30 year old 16” Gas gathering line, where strategic repair/remediation allowed continued operation of the asset without curtailing production.

Key words: Ageing pipelines, Production, Asset Integrity
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