Home – Home – Jornals – Chemistry for Sustainable Development 2023 number 2

A new multifunctional oil-displacing MIСA composition has been developed by the researchers of the IPC SB RAS for the purpose of oil recovery enhancement. The MIСA composition possesses oil-cleaning properties and is able to align the displacement front by increasing the reservoir sweep. Laboratory tests of MICA and its components (glycerol, carbamide, and boric acid) were carried out against the reservoir microflora of three groups: hydrocarbon-oxidising and denitrifying bacteria (HOB and DNB, respectively) as possible agents for enhanced oil recovery, and sulphate-reducing bacteria (SRB), as a corrosion-dangerous group. It is shown that HOB exhibited positive reactions to all versions of components introduction, as well as to the solutions of the composition diluted by a factor of 20-50. The presence of boric acid, in particular in the binary systems with carbamide and glycerol, suppressed the growth of DNB in spite of the stimulating action of glycerol and carbamide. The multifunctional MICA composition had a positive effect on the DNB count at 20-50 dilution. In the course of pilot work in 2020-2021 at the Usinskoye oilfield, a positive effect of the MICA composition on the growth of HOB and DNB groups and the inhibition of the SRB count was revealed. The effect decreased after 8-10 months due to manifold dilution of the composition and its displacement. This action of MICA and its components may be evaluated by two positive effects: an increase in the counts of HOB and DNB, as potential agents of oil displacement, and inhibition of the activity of SRB, as an agent of sulphide corrosion of equipment.