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Environmental activities: exploration and production

A series of measures continued to maintain discharges to sea at the ExxonMobil operated fields at a minimum level. Among other things, the Jotun, Balder and Ringhorne fields have been designed with solutions for discharging produced water and drilling waste through injection back into the ground. Substituting chemicals with more environmentally friendly alternatives have also made it possible to further reduce environmental risks of discharges to sea.

Regarding emissions to air, ExxonMobil focuses on reducing the emissions of CO2, NOx, CH4 and other volatile organic compounds (nmVOC). ExxonMobil has participated in CO2 quota trading since 2008, and also in 2015 quotas were bought for all CO2 emissions.

All of ExxonMobil’s operated licenses on the Norwegian Continental Shelf have participated in the Business Sector’s NOx Fund. The fund was established in 2008 to support the implementation of cost-effective measures in order to reduce NOx emissions across all business sectors. The fund is financed by companies contributing based on the size of their own NOx emissions. All of the four diesel generators at Balder have been modified to low NOx operation, and the costs of this have partially been financed by the NOx Fund.

The nmVOC recovery facilities regarding storage of oil on the Balder and Jotun production vessels have had an efficiency of 98 and 100 percent. Cooperation with other operators to ensure efficient reduction of emissions to air of nmVOC in relation to offshore oil loading to shuttle tankers has continued in 2015.

Systematic sorting and handling of waste are performed on all ExxonMobil’s operated offshore installations. All installations met the 2015 objective of minimum 75 % of all waste to be sorted.

Produced water

On Jotun and Balder/Ringhorne, respectively 46% and 51% of the produced water was reinjected in 2009. The average oil content in the produced water released to sea has seen a gradual reduction since year 2003 on Jotun, and since 2004 on Balder/Ringhorne. In 2009, the concentration of oil content in produced water from Jotun and Balder/Ringhorne was 12,5 mg oil/l water and 18,2 mg respectively.

Chemicals

In 2009, a total of 211 tons of chemicals were discharged from Balder and Ringhorne. Out of this, water and green substances represented 89,5% of the total discharges. Green substances occur in nature, and they are not considered having a negative impact on the environment. Yellow, red and black substances made up respectively 10,4%, 0,03% and 0,01% of total emissions from Balder and Ringhorne. On the Jotun field, a total of 99 tons of chemicals were discharged. Out of this, water and green substances made up 69% of the total discharges, while yellow substances made up 31%. There was no discharge of red or black chemicals from the Jotun field in 2009. No drilling operations were performed on the Balder, Ringhorne or Jotun fields in 2009.

Carbon dioxide and nitrogen oxides

Total emissions of CO2 and NOx from ExxonMobil'€™s combined activities in 2009 were kept at the same level as in previous years.

nmVOC

Emissions of volatile organic compounds (nmVOC) to air from ExxonMobil's total operations have been substantially reduced over the last years due to demands on emissions. The efficiency and operation of the nmVOC recovery equipment on our production ships Balder FPU and Jotun A has been close to 100%. Through participation in industrial cooperation the work regarding reduction of nmVOC emissions from the shuttle tankers was continued through 2009.

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