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Title: Assessing the impacts of scale residues from offshore oil and gas decommissioning on marine organisms
Authors: Cresswell, T
Brown, S
Wong, HKY
Apte, S
Keywords: Decommissioning
Offshore platforms
Naturally occurring radioactive materials
Risk assessment
Aquatic ecosystems
Issue Date: 2-Jul-2021
Publisher: CSIRO Publishing
Citation: Cresswell, T., Brown, S., Wong, H., & Apte, S. (2021). Assessing the impacts of scale residues from offshore oil and gas decommissioning on marine organisms. The APPEA Journal, 61(2), 379-383. doi:10.1071/AJ20024
Abstract: Successful decommissioning of offshore oil and gas infrastructure requires an effective and safe approach to assessing and managing chemical and radiological residues. Scale frequently accumulates on the interior surfaces of pipes and other structures and may persist long after extraction operations have ceased. Scale materials can contain a range of metal contaminants (including mercury), as well as naturally occurring radioactive materials. In newer or more accessible infrastructure, the scale is routinely removed, and becomes a waste product. The persistent nature of scale contaminants can result in a radiological dose to the organisms living on, or near an intact pipeline. Eventually, infrastructure corrosion following in situ decommissioning (abandonment) could lead to metal and radionuclide contaminants being accessible to the surrounding seafloor environment, where bioaccumulation and subsequent ecotoxicological effects from the chemical and radiological properties of the scale could occur. The paper describes a tiered approach to assess the ecological impacts of pipeline scale in order to assist operators with their plans for decommissioning offshore infrastructure, especially when considering ‘leave in place’ options. © CSIRO 2021
ISSN: 2206-8996
Appears in Collections:Journal Articles

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