METHOD FOR THERMOCHEMICAL TREATMENT OF AN OIL RESERVOIR Russian patent published in 2022 - IPC E21B43/24 E21B43/22 E21B47/06 C09K8/592 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry. The method for thermochemical treatment of an oil reservoir includes the determination of reservoir capacity and primary measurements of temperature and pressure in the interval of well perforation, depending on which the volumes and order of injection of reagents are determined: a solution of a binary mixture containing ammonium nitrate and sodium nitrite, as well as a reaction activator, and the control of temperature and pressure are performed during the processing of the oil reservoir. Before pumping the reagents, the buffer valve on the wellhead assembly is closed, the downhole submersible pump is stopped in a position that excludes their penetration into the pump during the injection of reagents, and the oil collector is disconnected from the outlet line of the wellhead assembly. Reagents are injected through the inter-tube space between the production column and the tubing with installed deep pumping equipment with a pressure 20-30% lower than the pressure of the production column. Between the injection of the binary mixture solution and the injection of the reaction activator, the high-pressure lines, the inter-tube space and part of the borehole are pre-washed between the deflated deep pumping equipment and the perforation interval, through which reagents are injected into the oil reservoir, with andisplacement inert liquid in a volume of at least a single volume of pipes through which the binary mixture solution and the reaction activator move.

EFFECT: optimization of the process of thermochemical treatment of the oil reservoir, reducing the volume of preparatory and final work.

1 cl, 1 dwg