To enhance the oil recovery of high-viscosity oil deposits in the temperature range of 20-210 °C, the multifunctional composition based on surfactants, aluminum and ammonium salts, an adduct of inorganic acid, carbamide and polyol with an adjustable viscosity and high oil-displacing ability was created. The composition has a low interfacial tension, a high buffer capacity in a wide pH range, 2.5-10 units pH, a delayed reaction with carbonate rocks, prevents the precipitation of insoluble reaction products, increases the permeability of reservoirs. The composition is both oil-displacing and flow-diverting, provides an enhance in the oil recovery factor (ORF) due to the increase in the oil displacement and formation sweep by water or steam flooding. Practical recommendations are given on the application of the composition at the Permian-Carboniferous deposits of the Usinsk oilfield.

The results of laboratory research, field testing and industrial use of physicochemical and integrated enhanced oil recovery (EOR) technologies for fields of Arctic and Siberian regions are presented. The EOR technologies are based on the concept of using reservoir energy to generate gels, sols and surfactant systems preserving in the reservoir a complex of properties that are optimal for the purposes of oil displacement. The technologies using gel-forming compositions and surfactant-based oil-displacing systems are applicable in extreme climatic conditions, effective in a wide range of geological and physical conditions and stages of field development, cost-effective and environmentally friendly.

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