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T.D. Williamson carries out isolation work offshore Nigeria

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Oilfield Technology,

T.D. Williamson (TDW) has completed its first SmartPlug® isolation in offshore Nigeria, working for a major operator through its local partner, Strides Energy & Maritime Ltd. (Strides).

SmartPlug non-intrusive isolation technology is designed to minimise production downtime during critical repair and replacement work. For natural gas pipelines, it eliminates the need to flare product.

In its typical configuration, the SmartPlug system meets the criteria for a true double block isolation. In this case, two plug modules provided a double barrier to isolate pipeline contents at 80 bar (1160 psi) line pressure; a third module allowed for in-situ pressure testing of the new valves at 132 bar (1915 psi) while the isolation remained undisturbed and in place.

The successful SmartPlug isolation remained in place for 32 days, completing the required work scope within the shutdown period.

Working closely with Strides and the operator, TDW overcame significant pandemic-related mobilisation challenges to prepare for and perform the successful isolation within the Operator’s urgent timetable.

Using videoconferencing capabilities enabled stakeholders in Nigeria, Norway, the Netherlands and the UK to virtually witness the factory acceptance testing (FAT). These efforts allowed TDW to deliver the equipment in just four weeks.

“This pandemic has forced us all to rethink the traditional ways we go about our business, from communication with our clients as well as within our own organisation, and also in the way we utilise remote technologies at our disposal,” TDW Project Manager Morgan Swanlund said.

Once the SmartPlug isolation tool was set, crews performed round-the-clock monitoring, both in person during the day and remotely (via satellite) by teams in Norway and Australia at night, when access to the platform was restricted. Wilson said this provided a foundation for future projects leveraging TDW remote monitoring technologies.


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