Abstract
This work is focused on improving reserve development efficiency and increasing the oil recovery factor (ORF) at mature oil fields producing high-viscosity crude oil. This issue is of particular relevant for the Republic of Kazakhstan, where high-viscosity oil reserves exceed 900 million tons and are largely confined to long-developed fields with declining production performance. In such conditions, conventional chemical or thermal stimulation methods often fail to deliver sustainable results, necessitating the application of technological solutions. The study analyzes combined enhanced oil recovery approaches, with emphasis on thermal gas-chemical treatments based on the interaction of aluminum-based alloys with formation water. These reactions generate heat and gaseous products, forming a localized thermobaric effect in the bottomhole zone. As a result, oil viscosity is reduced, fluid mobility is improved, and filtration characteristics in the near-wellbore region are enhanced. The proposed technological concept involves the use of multicomponent alloys as an alternative in-situ energy source for thermochemical treatment. The application of such alloys is aimed at the destruction and removal of asphaltene-resin-paraffin deposits (ARPD), restoration of reservoir permeability, and mitigation of ARPD accumulation in tubing during long-term well operation. The research methodology includes laboratory studies of thermochemical processes occurring in the bottomhole. Implementation of the proposed technical solutions contributes to the development of enhanced oil recovery technologies and provides a basis for improving the efficiency and sustainability of high-viscosity oil production at mature fields. Keywords: high-viscosity oils; thermal impact; oil recovery factor; water cut; modeling; reservoir pressure; development efficiency.