METHOD FOR INTENSIFYING OIL PRODUCTION FROM A DENSE AND LOW-PERMEABLE RESERVOIR Russian patent published in 2022 - IPC E21B43/26 C09K8/64 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry, and in particular to methods for enhancing oil recovery by changing the porosity and permeability properties (PPP) of a dense and low-permeable formation (including a formation with bituminous oil) in the interwell space. A method is proposed for intensifying oil production from a tight and low-permeable formation, including the construction of production and injection wells according to a given scheme into a productive formation, injection of a displacing agent into injection wells to maintain reservoir pressure, and selection of formation production from production wells. Through the selected well to increase the reservoir properties of the bottomhole and interwell zones, a liquid with sodium-containing elements is pumped into the formation with the release of chemical reaction products. At the same time, the fluid with sodium-containing elements is used as a fracturing fluid for hydraulic fracturing of the formation to form fractures into which the proppant is injected. Moreover, the liquid with sodium-containing elements is a suspension consisting of a liquid chemically neutral base without water content and 0.5-10% metallic sodium, crushed to a nanodispersed state. In this case, the main product of the reaction of sodium with subsequent injected or formation water is hydrogen, which is formed during the reaction with the release of heat to heat the bottomhole formation zone to at least 60°.

EFFECT: creation of a method for intensifying oil production from a tight and low-permeable reservoir, which allows expanding the scope of application by increasing the coverage of the impact on the interwell zone of the reservoir with the help of hydraulic fracturing, ensuring the removal of heavy oil fractions from the bottomhole formation zone.

2 cl