METHOD OF HEATING FORMATION WITH HIGH-VISCOSITY AND BITUMINOUS OIL Russian patent published in 2024 - IPC E21B43/24 E21B43/27 E21B47/06 C09K8/74 C09K8/592 

FIELD: oil industry.

SUBSTANCE: in the method of heating a formation with high-viscosity and bituminous oil, injection is carried out in the following order: 15–30% aqueous solution of hydrochloric acid is injected into the well beforehand to increase injectivity of the bottomhole zone, additionally containing surfactants or aminosulfonic acid, in amount of 25% of the total volume of the thermochemical composition; then pumped buffer of process water in amount of 0.25–1 m³; then performing the main formation heating cycle, which is implemented as follows: reaction initiator is pumped through the well in volume of 0.5–2 m³, then pumping buffer of process water in volume of 0.25–1 m³, then pumping reagent in volume of 0.5–3 m³; then, process water buffer is pumped in amount of 0.25–1 m³; then reaction initiator is pumped in volume of 0.5–2 m³; further, process water buffer is pumped in amount of 0.25–1 m³; Further, the following cycles of injection of the thermochemical composition follow, which are repeated until the entire volume of the reagent is pumped. Thermochemical composition is a reagent injected successively—an organic oxygen-containing compound, and a reaction initiator—an aqueous solution of hydrochloric acid, separated by a service water buffer.

EFFECT: increased oil recovery factor, increased coverage of the formation by action on deposits, increased safety of the process.

4 cl, 1 dwg, 1 ex