METHOD FOR PRODUCING HIGH-VISCOSITY OIL WITH IN-WELL THERMAL ACTIVATION OF BINARY SOLUTION Russian patent published in 2024 - IPC E21B43/24 C09K8/592 

FIELD: oil production industry.

SUBSTANCE: invention is applicable for horizontal or inclined multifunctional wells that combine the functions of production and injection. In the method of producing high-viscosity oil with in-well thermal activation of a binary solution, a well is first equipped. Next, a binary solution is pumped containing, wt.%: ammonium nitrate 27.8; sodium nitrite 32.2; the rest is water, which is supplied through the annular gap, bypass pipe and lower column to the end section of the casing pipe, then the binary solution enters the productive formation through the first opened zone or the second opened zone. Next, it is pressed with light oil with a density of no more than 0.92 g/cm³. Next, the downhole thermal activation of an exothermic chemical reaction is started by heating the previously injected binary solution to the activation temperature using a reactor, inside of which exothermic oxidation of a wide fraction of light hydrocarbons with atmospheric oxygen occurs. After the reaction starts, the supply of a wide fraction of light hydrocarbons and air is stopped. Next, a chain chemical reaction begins with the release of heat sufficient to form a thermal front throughout the entire treated zone of the formation. The thermal front heats up the high-viscosity oil in the formation, then the heated oil-water emulsion with reaction products flows through the first opened zone into the annulus between the lower string and the initial section of the casing, then it flows through the built-in adjustable valve to receive the submersible pump. Next, it is pumped to the surface through an additional pipe. When the flow rate decreases, pumping is stopped and the binary solution is reinjected into the productive zone of the formation through the lower column to increase oil fluidity, then pumping is carried out and the cycles are repeated.

EFFECT: increased oil recovery, the ability to choose the time from the start of injection of a binary solution to the start of the initiation of an exothermic chain reaction, the ability to delay the start of the chemical effect of the binary solution on the bottom-hole zone without fear of premature start of a chemical reaction, the ability to initiate a heat transfer chain reaction.

1 cl, 3 dwg, 1 tbl, 1 ex