Ashtead Technology has successfully completed its subsea integrity management project to support BP’s Quad 204 redevelopment of the Schiehallion and Loyal fields, West of Shetland.
Quad 204 is a major North Sea redevelopment incorporating a new FPSO and upgrade of the subsea infrastructure. It will enable the potential recovery of an additional 400 million barrels from the existing Schiehallion and Loyal fields and extend production through to 2035.
Ashtead deployed its new deflection monitoring system to capture critical data required to safely deploy and install two subsea manifolds at water depths of 400m. The technology was launched to the market earlier this year.
The system monitors deflection, heading, pitch, roll, depth and other parameters of subsea structures in real-time. This allows informed decisions to be made during critical operations, ensuring specified tolerances and safety requirements are taken into account.
The system was optimised to the exact pressures and water depths required for the scope of work at Ashtead’s UKAS accredited calibration laboratory before it was launched from a vessel and lowered to the seafloor.
The project was completed on time and allowed the subsea manifolds to be installed within 24 hours of the monitoring system being deployed. The entire project was controlled remotely via radio frequency and acoustic data links – removing the need for direct ROV or diver support intervention in order to gather measurements.
Allan Pirie, chief executive of Ashtead Technology, 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.
“In today’s increasingly harsh exploratory environments, data is key – it allows us to ensure subsea structures are installed to meet the differing complexities of developments around the world, offering long-term reliability and safety.
“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.”