The Danish offshore specialist has announced ambitious plans to upgrade its ultra-harsh environment jack-up rig Maersk Intrepid, to convert it into a hybrid rig with low levels of NOx emissions and reduced energy consumption and CO2 emissions.
The work will begin with the installation of batteries for energy storage next month, while the full implementation of the rest of the low-emission upgrades is due to be completed by the end of the year.
Energy used onboard an offshore rig is characterized by high peak loads during certain operations – but, by installing battery storage, Maersk Drilling says, the rig will have power instantly available when needed, so that basic energy requirements can be met by fewer engines operating at higher intensity, making it more efficient while reducing CO2 emissions.
Cloud-based Energy Emission Efficiency (EEE) software developed by Maersk Drilling will use real-time data to monitor all energy use on board the rig – allowing continuous optimization by, for example, switching off engines when they are not needed.
Live tests of EEE have demonstrated a double-digit energy saving potential under test conditions.
Selective Catalytic Reduction (SCR) systems capture NOx exhausts and use ammonia injections to convert the gas into harmless water and nitrogen.
By installing SCR units on all the rig’s engine exhaust pipes, Maersk Drilling expects to be able to reduce NOx emissions by more than 90%, while also reducing soot emissions significantly.
Maersk Drilling is receiving funding for the project from the NOx Fund – a Norwegian industry fund dedicated to reducing NOx emissions.
It says it will use its learnings from Maersk Intrepid to evaluate how to proceed with potential upgrades to reduce emissions from other Maersk Drilling rigs.