The energy optimisation projects initiated by Statoil and Songa Offshore is a noteworthy achievement, making more efficient and environmentally friendly drilling operations through technical enhancements of its operating drilling units.
For drilling contractors and energy companies, efficient energy management is a top priority since fuel consumption directly affects emissions and overall cost of producing a well. The Statoil and Songa Offshore industrial partnership is striving to reduce the carbon footprint. Some of the projects the companies have initiated to reduce NOx emissions are outlined below;
Exhaust gas heat exchanger - project involves the installation of heat exchangers on each of the engine exhausts for water heating. The existing infrastructure for the chilled water distribution system will be used for the hot water for heating throughout the drilling unit. The hot water replaces the need to utilize electrical heaters for heating the air in the HVAC system. There is also potential for further system expansion to replace stand-alone electrical heaters with hot water coil heaters. Due to replacing electrical heaters there will be great savings in fuel and emissions. The NOx Fund has been extremely supportive carrying up to 80% of the total cost of this project, as it both reduces fuel consumption and NOx emissions.
Heat tracing optimisation - project is the installation of a smart control system on the heat tracing system (system that prevents freezing) where newly installed local temperature sensors will be used to determine required on demand heating. The heat tracing circuit system will also be segregated into logical areas to further take advantage of smart control and avoid unnecessary heating of low priority areas. The heat tracing system on these drilling units is substantial due to the high degree of winterization, and thus power demand is high, the application of the smart controller will significantly reduce the power demand and therefore the fuel consumption and NOx Emissions. This project has also been approved and will be funded up to 80% by the NOx Fund.
Seawater cooling pumps - project involves installation of Variable Frequency Drives for control of the Seawater cooling pumps. At present the pumps run at maximum capacity when related equipment is running regardless of the need for actual cooling, the new VFD control puts the pumps on temperature control demand. This reduces the power consumption of the pumps leading to fuel savings and NOx reduction, in addition, this also reduces pump wear and tear and will benefit maintenance cost. This project will also receive a funding of up to 80% of its total cost by the NOx Fund.
Hybrid power - project is the installation of battery packages which shall act as a spinning reserve to reduce the number of running engines, allowing the battery package to absorb the peak loads rather than having an extra generator running. This will optimize engine usage and avoid “low load” engine operation, further it will reduce fuel consumption and NOx emissions. Statoil and Songa Offshore are currently conducting a concept feasibility study of such system. When the study is finished, it will be decided if the system shall be implemented on the drilling units, where NOx funding similar to the other ongoing projects mentioned above will play an important role to be able to realize such a project.
In addition to the NOx funding, Statoil will carry the direct cost with implementing the measures while Songa Offshore are executing the projects and carry out the required modifications while the Drilling Units are in operation.
“We are very pleased to see the strong focus on reducing emissions from the offshore drilling campaigns in the industrial partnership between Statoil and Songa Offshore. All these abovementioned projects are aligned with the objectives of the NOx Fund, and we are delighted that we can offer financial support to secure the execution of such, said Tommy Johnsen, Managing Director at the NOx Fund.
“Songa Offshore see great strategic potential in making the 4 CAT-D rigs more energy efficient. It makes our drilling campaigns more environmentally friendly, more efficient and hence more economical for the client well program further it makes our drilling units even more competitive in the future. It is all about working smarter, cleaner and taking the advantage of applying proven technologies into the offshore business. The financial support we receive from the NOx Fund, eases the execution process for the respective projects, said Ove Stavø, Technical Director at Songa Offshore.
About the NOx Fund
The NOx Fund is established by 15 cooperating business organisations, organised under the Norwegian Confederation for Business and Industries. Reduced NOx emissions is the primary objective of the Environmental Agreement relating to NOx and the Business Sector’s NOx Fund. The Fund is a cooperative effort where Participant enterprises may apply for financial support for NOx reducing measures.
The Fund’s success is dependent on that sufficient NOx reducing measures are being implemented, ensuring that the emission obligations vis-à-vis the Environmental Agreement are being met. Although several measures have been implemented already, all new measures that will be implemented will serve as important contributions to ensure that the reduction obligations vis-à-vis the Environmental Agreement are being met.
For more information, please visit: www.nho.no/nox
Statoil is an international energy company with activities in more than 30 countries. Statoil is headquartered in Stavanger, Norway with approximately 20,500 employees worldwide.
For more information, please visit: www.statoil.com
About Songa Offshore
Songa Offshore owns and operates a fleet of seven semi-submersible rigs, of which four rigs are operating on the Norwegian Continental Shelf with Statoil as charterer. The rigs are operated out from Stavanger, Norway with approximately 1000 employees, mainly in Norway.
For more information, please visit: www.songaoffshore.com