Independent risk assessment : an innovative approach of qualitative risk mitigation measures-prioritization for well integrity assurance

Degradation of original well barrier elements might occur after some time in operations. Due to huge number of wells and increasing matured field issues, the key challenge faced is to prioritize the remedial measures and pro-active health checks based on well risk level, barrier status and available...

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Main Author:	Abu Bakar, Mohd. Abu Yazid
Format:	Thesis
Language:	English
Published:	2016
Subjects:	TP Chemical technology
Online Access:	http://eprints.utm.my/id/eprint/102072/1/MohdAbuYazidAbuBakarMsche2016.pdf.pdf
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spelling	my-utm-ep.1020722023-07-31T07:46:59Z Independent risk assessment : an innovative approach of qualitative risk mitigation measures-prioritization for well integrity assurance 2016 Abu Bakar, Mohd. Abu Yazid TP Chemical technology Degradation of original well barrier elements might occur after some time in operations. Due to huge number of wells and increasing matured field issues, the key challenge faced is to prioritize the remedial measures and pro-active health checks based on well risk level, barrier status and available resources to ensure that wells operate in safe operating envelope. Knowledge of well integrity status at all times enables company to take the right actions in a proactive manner to prevent incidents. In 2015, management has undertook this project with the goal of understanding and minimizing risk of well barriers failure. The operations include 5 fields, 7 platforms, for a total of 135 active wells. This project present a study in which well integrity was evaluated by independent reviewer as approach for an efficient visualization and description of interrupted well barriers. Then, the responsible parties involved can take action more accurately according to the type of failure that has been revealed to verify and reinstate barrier integrity of the wells. Well integrity risk assessment operational methodology approach includes comparison between measured leakage rate/pressure with maximum allowable limit to estimate how close each well is losing its barriers safety condition. Total of 6 case studies have been performed, which are packer leak, tubing leak and SCSSV passing for primary barrier, while cement failure, high annulus pressure and Christmas Tree valves passing for secondary barrier. Result shows that SCSSV (75%) and Christmas Tree valves (65%) passing are the highest barrier failures which contributes to 53% of high (H) risk ranking. Only 35% of serious (S) risk ranking reported which requires immediate intervention or else shut-in until further approval. In future study, strong focus should be on development of site-specific performance standard in order to demonstrate compliance and ensure well integrity. Operators can benefit by efficiently identifying the critical wells among the thousands being operated so that limited resources can be applied to gain most benefit. 2016 Thesis http://eprints.utm.my/id/eprint/102072/ http://eprints.utm.my/id/eprint/102072/1/MohdAbuYazidAbuBakarMsche2016.pdf.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:147964 masters Universiti Teknologi Malaysia Faculty of Engineering - School of Chemical & Energy Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TP Chemical technology
spellingShingle	TP Chemical technology Abu Bakar, Mohd. Abu Yazid Independent risk assessment : an innovative approach of qualitative risk mitigation measures-prioritization for well integrity assurance
description	Degradation of original well barrier elements might occur after some time in operations. Due to huge number of wells and increasing matured field issues, the key challenge faced is to prioritize the remedial measures and pro-active health checks based on well risk level, barrier status and available resources to ensure that wells operate in safe operating envelope. Knowledge of well integrity status at all times enables company to take the right actions in a proactive manner to prevent incidents. In 2015, management has undertook this project with the goal of understanding and minimizing risk of well barriers failure. The operations include 5 fields, 7 platforms, for a total of 135 active wells. This project present a study in which well integrity was evaluated by independent reviewer as approach for an efficient visualization and description of interrupted well barriers. Then, the responsible parties involved can take action more accurately according to the type of failure that has been revealed to verify and reinstate barrier integrity of the wells. Well integrity risk assessment operational methodology approach includes comparison between measured leakage rate/pressure with maximum allowable limit to estimate how close each well is losing its barriers safety condition. Total of 6 case studies have been performed, which are packer leak, tubing leak and SCSSV passing for primary barrier, while cement failure, high annulus pressure and Christmas Tree valves passing for secondary barrier. Result shows that SCSSV (75%) and Christmas Tree valves (65%) passing are the highest barrier failures which contributes to 53% of high (H) risk ranking. Only 35% of serious (S) risk ranking reported which requires immediate intervention or else shut-in until further approval. In future study, strong focus should be on development of site-specific performance standard in order to demonstrate compliance and ensure well integrity. Operators can benefit by efficiently identifying the critical wells among the thousands being operated so that limited resources can be applied to gain most benefit.
format	Thesis
qualification_level	Master's degree
author	Abu Bakar, Mohd. Abu Yazid
author_facet	Abu Bakar, Mohd. Abu Yazid
author_sort	Abu Bakar, Mohd. Abu Yazid
title	Independent risk assessment : an innovative approach of qualitative risk mitigation measures-prioritization for well integrity assurance
title_short	Independent risk assessment : an innovative approach of qualitative risk mitigation measures-prioritization for well integrity assurance
title_full	Independent risk assessment : an innovative approach of qualitative risk mitigation measures-prioritization for well integrity assurance
title_fullStr	Independent risk assessment : an innovative approach of qualitative risk mitigation measures-prioritization for well integrity assurance
title_full_unstemmed	Independent risk assessment : an innovative approach of qualitative risk mitigation measures-prioritization for well integrity assurance
title_sort	independent risk assessment : an innovative approach of qualitative risk mitigation measures-prioritization for well integrity assurance
granting_institution	Universiti Teknologi Malaysia
granting_department	Faculty of Engineering - School of Chemical & Energy Engineering
publishDate	2016
url	http://eprints.utm.my/id/eprint/102072/1/MohdAbuYazidAbuBakarMsche2016.pdf.pdf
_version_	1776100839071416320

Independent risk assessment : an innovative approach of qualitative risk mitigation measures-prioritization for well integrity assurance

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