MULTIFUNCTIONAL ACID OIL-DISPLACING COMPOSITION FOR USE IN FIELDS WITH TERRIGENOUS RESERVOIR TYPE
Abstract
The paper presents the results of development and research of multifunctional acid oil displacing composition for application in the West Siberian viscous oil field with terrigenous reservoir type. On the basis of the results of physical modeling of oil displacement process the efficiency of multifunctional acid oil-displacing composition has been evaluated in relation to the conditions of viscous oil fields of Western Siberia, which are at early and late stages of development. The oil displacement process with the use of multifunctional acid oil displacing composition was carried out under conditions modeling the natural development mode at the temperature of 23 °С and at the temperature of 90 °С. The study of oil-displacing ability of multifunctional acid composition showed its high efficiency for oil production intensification and oil recovery enhancement of viscous oil fields of Western Siberia with terrigenous reservoirs. The composition provides increase in oil displacement coefficient from high-permeability and low-permeability models of highly heterogeneous reservoir due to high oil-washing properties, as well as equalization of injectivity profile, increase in reservoir coverage coefficient by physical and chemical influence (change of permeability ratio of layers in the reservoir model). As a result of analysis of the components of the composition in the samples taken at the outlet of the model of heterogeneous reservoir, the presence of a large amount of urea in them is shown, and the value of the hydrogen indicator pH during the experiment decreases from 7.2 to 2.4 pH units and then, after heating to 90 °С and subsequent exposure, as a result of partial hydrolysis of urea, which is part of the composition, shifts to the region of neutral values, reaching 6.2 pH units. The composition has low corrosive activity and good solubilizing ability in relation to terrigenous reservoir rock.
For citation:
Kozlov V.V., Sholidodov M.R., Altunina L.K., Kuvshinov I.V., Saidentsal A.R., Mustafin R.N. Multifunctional acid oil-displacing composition for use in fields with terrigenous reservoir type. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2024. V. 67. N 8. P. 95-102. DOI: 10.6060/ivkkt.20246708.8t.
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