Role of surfactant mass transfer and the formation of an oil bank in displacement of oil through porous media
Book
·
OSTI ID:6164050
The oil displacement in the surfactant polymer/flooding process occurs in 3 stages: first, oil ganglia are released from the capillaries by the surfactant slug; then they are dislodged and coalesce to form an oil-water bank; finally, the bank is driven out of the porous media by the polymer solution. In this study an idea of injecting a slug of oil to initiate the oil-water bank is proposed and investigated for both the small slug concentrated surfactant system and the large slug dilute surfactant system. To further improve the oil displacement efficiency, the effects of the size of the injected oil bank slug and the sacrificial chemicals are studied. For the concentrated surfactant system, the oil/water relative permeability curve is suggested to account for the observed improvement in oil recovery efficiency. For the dilute surfactant solution, the surfactant adsorption and the integrity of the oil bank are the determining factors. Surfactant mass transfer from the injected fluid to the reservoir fluid is the key to control the factors and to insure the success of the process.
- OSTI ID:
- 6164050
- Country of Publication:
- United States
- Language:
- English
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