The currently used classical chemical technologies for enhanced oil recovery are an integral part of the oil field development system, but their application is limited by the range of geological and technological parameters. There is a need to create new approaches to expand the possibilities of using chemical technologies, including the creation of a new class of chemical products.
The experience of work on the creation and implementation of chemical compositions for flow-diverting technologies and technologies for the intensification of oil production, intended for use in a wider range of geological conditions (high reservoir temperatures and water mineralization, low-permeability, the content of aggressive components in reservoir oil) and manufactured on the basis of available chemical raw materials is presented.
A single–component composition AC-CSE-1313 grade B (a hydrophobic water-soluble polymer – gel SPA-Well) has been developed for flow-diverting technologies based on silica-based polymers capable of simultaneously blocking the advance of injected water through highly permeable reservoir channels and stimulating the displacement of oil in low-permeable intervals. For the period 2019-2023, more than 200 well operations were performed with high efficiency at injection wells with the use of water control technology based on the reagent AC-CSE-1313 grade B (SPA-Well), mainly in the fields of Western Siberia.
In the field of oil production intensification in carbonate and terrigenous reservoirs, reagents RBS-3 and DGK-2 have been developed on the basis of metal-complex chelating compounds, which allow cleaning wells from contaminants that are not removed by other reagents. The RBS-3 reagent has been successfully used in the development of wells in difficult reservoir conditions in the regions of Kalmykia, Dagestan and the Caspian Sea shelf. The DGK-2 reagent showed high efficiency when processing producing wells at a carbonate facility in the Timan-Pechora region with an efficiency comparable to the efficiency of hydraulic fracturing.
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