A new technique to increase enhanced oil recovery rate in low-temperature layers

Abstract

The paper introduces experimental research results, on the basis of which a method for enhancing oil recovery of low-temperature formations was developed, including thermal gas and chemical effects. The initiation of the oxidation process by injection of chemical agents contributes to its uniform distribution in the bottomhole zone, the increase in the initiation zone and the leveling of the front of the advancement of the exothermic reaction zone. The thermal and oil-displacing rims formed as a result of the oxidation process contribute to a significant increase in oil recovery. When applying the proposed method of developing an oil deposit, corrosion of equipment decreases, the amount of carbon dioxide formed increases, produced water becomes alkaline, and the oil displacement coefficient increases significantly. The prospect of the proposed method is associated with the use of in-situ energy potential, low-value chemical reagents, as well as the high availability of the main agent - air. The technology is easy in implementation, cost-effective and does not require special well design. Keywords: pyrite; exothermic reaction; sodium hydroxide solution; ammonium carbonate solution; oxidation; enhanced oil recovery; stimulation methods; oil displacement bank.