Abstract
Abstract Cyclone separation of oil, water and gas has created new possibilities for separation of fluids down-hole close to the producing formation and thus facilitating separation at generally more favourable conditions. In this paper, alternative well configurations incorporating down-hole separation of oil and water are suggested and discussed in terms of costs and feasibility, and effects of down-hole separation on well flow performance and reservoir behavior are evaluated. Potential effects of the new technology on reservoir behavior has been investigated on a hypothetical water coning reservoir. Reservoir behavior under dual completion above and below water-oil contact combined with water reinjection in the aquifer is compared to conventional coning behavior. Our results show that balancing of the water-oil contact is possible by dual completion. By reinjection of the produced water far away from the production interval, the water displacement mechanism is maintained. By supplementing the produced water reinjection by external water, in order to enhance the water displacement, very high recoveries may be obtained. Separation of oil and water down-hole may reduce the use of toxic chemicals in pipelines and a brief discussion of the topic is included.
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