The Challenge

A/S Norske Shell is running a long-term seabed monitoring campaign over the giant Ormen Lange gas field, 120 km offshore Norway, using an array of our Fetch pressure monitoring transponders (PMTs) in 800 – 1,100 m water depth at the field.

Fetch PMTs accurately collect pressure, temperature and inclination data at the seafloor, at pre-programmed intervals. Using this data, any vertical displacement of the seabed can be calculated. The data will help Norske Shell to proactively inform its reservoir management strategy. Each incorporates a high-speed acoustic modem, allowing stored data to be extracted at any time, wirelessly through the water, on demand.

During previous seabed monitoring campaigns, Norske Shell used a vessel of opportunity to travel out to the field to harvest the data using wireless acoustic communications. However, regularly visiting the sensors to gather the information they contain comes with costs, emissions and puts employees in potential harm’s way offshore.

The Solution

We provided a full seabed to shore data collection service. Using an unmanned surface vessel (USV), also referred to as unmanned surface vehicles, we visited the site and collected all the Fetch PMT data, without a single person having to travel offshore or from their home office.

The USV, an XOCEAN XO-450, was “posted” via cargo ship to Norway for the project and was launched by local marine operations service provider SafePath AS. The USV, piloted by XOCEAN staff in Ireland, then carried out the full mission, covering 300 km from Kristiansund and back, over just three days.

Throughout the mission, all those involved in the project, including Sonardyne’s remote operations specialists in the UK, XOCEAN’s pilots and Shell’s geophysicists in Norway and the US, remained working from their home offices where they were able to quality check and then receive the data, live.

Result

One of the largest data harvesting missions using a USV, to date, achieved safely, quickly and with significantly lower emissions and costs than could otherwise be achieved. An estimated 5.4 tonnes less CO2 per day was emitted compared with a manned vessel had been used. XOCEAN offset any remaining emissions created by its vessel.

Benefits

As well as minimizing risk to personnel, reducing costs and emissions, using a USV for data collection also meant the time download the data was halved, thanks to the maneuverability and low hull and electric propulsion noise of the USV.

For more information about our USV Data Harvesting Service, click here.

Read more: https://www.sonardyne.com/sonardyne-instruments-chosen-by-a-s-norske-shell-for-long-term-reservoir-monitoring/