Bruce Mutume, Tendai Donavan Zisengwe

The Draugen field is well-known for producing oil that is then transported to power plant facilities to generate electricity in Draugen. However, with declining oil production (as of 2021) and new necessary electrification contracts, the field may be unable to meet the demand for plant facilities. The current study combines waterflooding and reservoir simulation methods from the Computer Modelling Group (CMG) to evaluate the effectiveness of the secondary recovery type of production
optimization. The approach is divided into three parts to meet the current study's objectives: (1) matching reservoir dimensions (Draugen's and the model's dimensions) to match Draugen field's
Original Oil in Place (OOIP), (2) history matching, and (3) production optimization analysis using CMG. The estimated recoverable oil before the waterflood-CMG optimization analysis (in 2021) was 99 500 000 m3 , but after optimization (2050), the recoverable oil increased to 108 370 000 m3 . The waterflood method increased the drawdown by 250 times that of the simulation's start, increasing the production rate from 0 to over 1 500 m3 /day/well. Finally, the former resulted in the recovery of 8
8700 000 m3 of oil, proving the viability of the secondary type recovery method at the Draugen field. Consequently, the oil saturation decreased from a high of 35 to 60 % to the field's residual oil saturation range of 21 to 23 %. Our results support the adoption of the waterflooding technique for oil
optimization at Draugen Field.