Subsea laser scans applied to North Sea Captain facilities
Ashtead Technology has completed a subsea laser scanning project for Subsea 7 on Chevron’s Captain field in the UK central North Sea.
The company performed a well inspection using Newton Labs’ M210UW and M3200UW subsea laser scanning systems.
Ashtead designed and engineered deployment tools that allowed the scanning systems to capture accurate images at water depths of 110 m (361 ft) using divers.
The program included an internal casing inspection and a horizontal mapping survey to capture more than 100 short- and long-range scans. This allowed Ashtead to generate a 3D model of the structure with what the company claims was sub-millimeter accuracy.
The scanning systems had undergone testing at the company’s facility in Westhill prior to a simulated dry-run ahead of deployment.
This was Newton Labs’ first subsea project using its recently launched M3200UW laser scanner, designed to operate with either a scanning or a fixed laser line to measure underwater objects to 0.02 mm accuracy.
It is ROV or diver-operable, and fitted with a high-resolution camera, allowing data to be streamed live, in real time.
The scanner is also said to provide detailed underwater inspection and measurements by means of optical triangulation. The projected laser line sweeps the target surface and the high-resolution camera captures and records the visual data to create a point cloud 3D model.