Effect of the acid GBK composition and reservoir microflora on the displacement efficiency and composition of the oil from the Usinskoye oilfield

An acid composition based on an adduct of an inorganic acid, a polyol and a surfactant has been developed at the Institute of Petroleum Chemistry, SB RAS. The composition, which includes glycerin and urea, stimulates the growth and hydrocarbon-oxidizing activity of the reservoir microflora under conditions of simulated biodegradation and physical modeling of oil displacement process. Biodegradation results in an increase in the proportion of oxygen-containing and aromatic structures, while the proportion of cyclic hydrocarbons in the group composition has decreased. The changes in the molecular mass distribution of mono, bi- and triaromatic hydrocarbons were revealed. The combined use of the acid composition and the hydrocarbon-oxidizing microflora provided an increased displacement of oil from models of core samples with low and high permeability.An acid composition based on an adduct of an inorganic acid, a polyol and a surfactant has been developed at the Institute of Petroleum Chemistry, SB RAS. The composition, which includes glycerin and urea, stimulates the growth and hydrocarbon-oxidizing activity of the reservoir microflora under conditions of simulated biodegradation and physical modeling of oil displacement process. Biodegradation results in an increase in the proportion of oxygen-containing and aromatic structures, while the proportion of cyclic hydrocarbons in the group composition has decreased. The changes in the molecular mass distribution of mono, bi- and triaromatic hydrocarbons were revealed. The combined use of the acid composition and the hydrocarbon-oxidizing microflora provided an increased displacement of oil from models of core samples with low and high permeability.