Shell (SHEL) said Friday it has begun subsea compression to increase the amount of gas recovered from the Ormen Lange field in the Norwegian Sea to 85% from 75%.

The two new compressor stations installed on the seabed are expected to result in the extraction of additional 30-50 billion cubic meters of gas from the field, the gas from which is exported to European markets, the company said.

Shell said it operates, and holds a 17.8% stake, in the field, with its partners Petoro, Equinor (EQNR), Orlen Upstream Norway and Var Energi having respective stakes of 36.5%, 25.3%, 14% and 6.3%.

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