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Multi-Diameter Pigging Feasibility Study

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Multi-Diameter Pigging Feasibility Study

Benefits

Atteris identified and assessed a range of inline inspection technologies which enabled client to progress its concept for a 24 to 34-inch multi-diameter riser / pipeline system. The work proved feasibility that the system would be inspectable and thus reduced development costs could be realised.

Background

During Concept Development, Client was investigating the feasibility of a 24-inch Steel Catenary Riser (SCR) system on a semi-submersible compression platform. The 24-inch SCR presented an opportunity for topsides intelligent pig launching as opposed to subsea launching. This would result in a significant reduction in technical, health and safety risk, and reduction in cost for in-line inspections act.

Atteris was engaged to investigate current and near-future multi-diameter ILI capabilities to determine the likelihood of achieving “industry-standard” inspection results for such a large diameter step change.

Work Performed by Atteris

Estimates of wall thicknesses for the future riser system
Identification and assessment of ILI tools currently available to the industry
Assessment of technical feasibility and status of each inspection technology, as it applies to a 24 to 34-inch pipe diameter change
Recommend a multi-diameter ILI tool for a 24 to 34-inch system that can be qualified in the near term with high confidence

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