Scientific and technical journal
«Oilfield engineering»
ISSN 0207-2351
Back to issue Composition of surfactants for increasing oil recovery from depleeted oilfield of the Devonian sandstones of the Volga-Ural region
UDC: 622.276.64
DOI: 10.33285/0207-2351-2022-7(643)-32-38
Authors:
1,1,2,2,3,11 Ufa Scientific and Technical Center, Ufa, Russia
2 Bashkir State University, Ufa, Russia
3 Ufa State Petroleum Technological University, Ufa, Russia
Keywords: Devonian oil, surfactants, polar oil molecules, micellar particle sizes, tangent of the dielectric loss angle, dielcometry, reservoir linear model, displacement coefficient
Annotation:
The Devonian terrigenous deposits of the Volga-Ural oil basin are currently at the final stage of their development. The residual oil recovery after flooding requires applying the methods of oil recovery enhancement aimed at increasing the oil displacement efficiency.
The article experimentally substantiates the method of dielcometry for possible selection of effective surfactants. Since the value of the tangent of the dielectric loss angle is determined by the polarity of surfactant and oil molecules, then this value is used for possible estimation of the affinity of polar oil molecules to a particular type of surfactants. It is revealed that in case the frequencies corresponding to the maximum values of the tangent of the dielectric loss angle of oil and surfactant coincide, then the surfactant will be effective for this oil. Filtration studies on reservoir models have proved the surfactant compositions effectiveness, one of the components of which was selected by the method of dielcometry. Based on the results of filtration experiments, an increase in the oil displacement coefficient equaling to 8,7...10,1 was achieved.
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