Statoil, working closely with solid international suppliers, has developed entirely new rig concepts aimed at increased recovery and drilling on new fields. We also utilise different types of existing rigs and vessels adjusted to our needs.
The list below shows the various vessels and rigs from smallest to largest. A larger selection of rigs contributes to improvements both in respect of HSE, efficiency and cost as each rig type is fit for the specific purpose.
Cat A: Vessel for light well intervention. Used for light wireline operations in subsea wells. Can also be used to plug wells.
Cat B: Fit for purpose rig for well intervention and sidetrack drilling through production tubing (so-called ”through tubing drilling and completion”). For use in wireline operations, coiled tubing, plugging of wells and sidetrack drilling. The well services will be done through existing subsea x-mas trees.
Cat C: Ordinary drilling rig that can be used for all types of operations.
Cat D: Custom-built rig adapted to medium water depths on the Norwegian Shelf. For use in drilling, completion and well workovers, but can also be used for similar operations as Cat A and Cat B, but is not optimised for this. Statoil has four rigs of this type on order.
Cat I: New arctic drilling unit. Cat I will be a tailor-made floating drilling concept, able to operate across our Arctic acreage. Statoil has on-going R&D activities to qualify drilling and critical support technologies. Going forward we will invite the supplier industry, as we have done on the other category concepts on the NCS, to work with us on arctic drilling solutions.
Cat J: Jack-up drilling rig with longer legs for deeper waters than customary for this type of rig. For use in drilling, completion and well workovers, but can also be used for similar operations as Cat A and Cat B, but is not optimised for this.
The vessels and rigs will be between 20 and 60 percent more efficient than traditional rigs and will make a considerable contribution in new field developments and projects aimed at enhancing production from our existing fields.
Statoil takes a long-term approach to the development of the NCS. Important measures are therefore implemented to cut drilling costs, ensuring that we have appropriate tools for continued profitable development of our joint resources. If this requires long-term agreements or the possibility of ownership, we are willing to take such a risk for this part of our rig portfolio.