UK-based Ashtead Technology has completed a subsea integrity management project in a bid to support BP’s Quad 204 redevelopment of the Schiehallion, as well as Loyal fields in West of Shetland.

The redevelopment incorporates a new floating production storage and offloading (FPSO) and will enable the potential recovery of an additional 400 million barrels of resource from the two fields.

As part of the project, the company deployed its new deflection monitoring system (DMS) to capture critical data that is needed to install two subsea manifolds at water depths of 400m.

DMS was launched to the market earlier this year and monitors deflection, heading, pitch, roll, depth and other parameters of subsea structures in real time.

Using this technology, companies will be able to make informed decisions at the time of critical operations.

Ashtead optimised the DMS to the exact pressures and water depths required for the scope of work at its calibration laboratory, prior to launching it from a vessel and lowering it 400m onto the seafloor.

The project allowed installation of the subsea manifolds within a short span of time and was remotely controlled through radio frequency and acoustic data links, eliminating the need for direct ROV or diver support intervention to collect attitude measurements.

"The company developed the new approach to the installation and integrity management of subsea systems as part of its range of services to reduce risk and subsea operations cost."

In order to improve the accuracy of data collected, Ashtead used various communication and positioning tools.

The company developed the new approach to the installation and integrity management of subsea systems as part of its range of services to reduce risk and subsea operations cost.

Ashtead Technology chief executive Allan Pirie said: “Whilst subsea structures look robust and are designed to last decades, they can be easily damaged during installation and incorrect orientation can lead to stress on flowlines and jumpers.

“Our deflection monitoring system was designed to provide a versatile platform for improved cost and safety performance, whilst reducing technological and operational risk and capturing key information that can extend the life of subsea assets.”


Image: DMS monitors deflection, heading, pitch, roll, depth and other parameters of subsea structures in real time. Photo: © Ashtead Technology.