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Sensitivity Analysis of Tertiary Gas Injection in Water-Flooded Fractured Oil Reservoirs
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 79th EAGE Conference and Exhibition 2017, Jun 2017, Volume 2017, p.1 - 5
Abstract
In naturally fractured reservoirs which are under water injection or in contact with a strong aquifer, extreme oil trapping is a major problem. For such a condition, one of the best methods of enhancing the recovery would be the immiscible tertiary gas injection to the region occupied by water.
In this study, by the employment of a black oil simulator software, a naturally fractured reservoir have been simulated in field scale. Then we analyzed some of the parameters such as the injection rate, reservoir dip, and fracture spacing.
The results show that injecting gas with a rate lower than the critical gas injection rate would result in relatively slow but extremely high recovery. Also tilted and anticline reservoirs are two of the best candidates for implementing the process of gravity drainage under gas injection. And in naturally fractured reservoirs, as the matrix blocks become smaller in size, the ultimate oil recovery based on the pore volume injected would increase.