- Title
- Laboratory study of under-deposit corrosion of steel pipelines in seawater environment
- Creator
- Wang, X.; Melchers, R. E.
- Relation
- Annual Conference of the Australasian Corrosion Association 2014: Corrosion and Prevention 2014. Proceedings of the Annual Conference of the Australasian Corrosion Association 2014: Corrosion and Prevention 2014 (Darwin, N.T. 21-24 September, 2014)
- Relation
- http://www.corrosion.com.au/Library/Publications/articleType/Search?Search=Laboratory+study+of+under-deposit+corrosion+of+steel+pipelines+in+seawater+environment
- Publisher
- Australasian Corrosion Association
- Resource Type
- conference paper
- Date
- 2014
- Description
- Water injection is a practical and widely employed method to promote production for oil industry especially for mature oil reservoirs. For this seawater, aquifer water and produced water (water recovered from crude oil) are most commonly used. Typically the water injection pipelines (WIP) are carbon steel and are not cathodically protected. The potential for pipeline failure caused by internal corrosion is an on-going concern for the industry. Corrosion mitigation methods include deoxygenation, corrosion inhibitors, biocides, and pigging. The most serious corrosion problem is channelling corrosion, known also as 6 o’clock corrosion or bottom of line corrosion, although it does not occur in all pipelines, for reasons not fully understood. It shows as aggressive corrosion at the bottom part of pipelines and is much more severe than corrosion elsewhere in WIPs. Recent assessment and monitoring of several water injection pipelines from the North Sea continental shelf obtained either by intelligent pigging tools or onsite bio-coupons has indicated that microbiologically influenced corrosion (MIC) and under-deposit corrosion are likely to be involved in channelling corrosion. Despite occasional industrial reports and conference papers, the comprehensive interpretation of this type of corrosion is still limited. The present paper outlines an experimental pilot study of under-deposit corrosion of mild steel model pipeline coupons exposed to deoxygenated natural seawater in simulated field conditions. Identical test rigs and different test scenarios were established to ascertain the influence of the presence of deposits, of water quality, surface roughness and nitrate addition. SEM observations of changes in surface topography for the first set of samples after 12 days exposure are reported. The paper also discusses the potential reasons of the formation process of channelling corrosion in water injection pipelines and the effect of early stage corrosion for long-term trends.
- Subject
- water injection pipeline; under-deposit corrosion; steel; seawater
- Identifier
- http://hdl.handle.net/1959.13/1298166
- Identifier
- uon:19598
- Identifier
- ISBN:9781634395441
- Language
- eng
- Full Text
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