THERMAL METHOD OF EXTRACTING UNCONVENTIONAL OIL FROM DEEP FORMATIONS AND PROCESS COMPLEX FOR IMPLEMENTATION THEREOF Russian patent published in 2024 - IPC E21B43/24 

FIELD: oil industry.

SUBSTANCE: proposed group of inventions relates to oil industry, in particular to extraction of unconventional high-viscosity and heavy oil from deep reservoirs. Thermal method of extracting unconventional oil from deep formations in flowing mode includes pumping to oil-containing formation through an injection well from an oxygen station through injection wells of a cluster of hydrodynamically connected to each other injection-producing wells (IPW), having injection and production pipes, ignition of oil near injection well, formation of combustion front in oil-bearing formation, which reduces oil viscosity, oil squeezing to production wells of (IPW) cluster. In injection wells, along with oxygen, a displacement agent is pumped by a high-pressure pump, which is water, with creation of medium pressure in the formation above supercritical for water in the range of P = 25−50 MPa, due to heat release during oxidation of oil in the formation the water temperature at the bottom is higher than the critical value for water T = 400−900 °C, thus creating a movable expanding cloud of supercritical water (CSCW) near the bottom. Combustion zone is displaced along oil-bearing formation from exhausted well to fresh well. During its movement the OSKV carries out thermochemical reactions and extracts hydrocarbons into itself when passing sections of the formation between these hydrodynamically connected wells, destroys interlayers, increases oil extracted into the cloud to external boundaries of the formation and directs hydrocarbons to production wells for lifting to day surface. Method is carried out by means of a process system, which includes a cluster of hydrodynamically connected injection-production wells (IPW), an oxygen station for supplying oxygen to injection wells, oil firing device near the bottomhole of injection wells, a high-pressure pump for supplying water as a displacement agent into the injection pipes of the IPW, regulators of water supply to each injection pipe of the IPW, pressure regulators of the extracted products "upstream" at the mouth of each production IPW pipe, oxygen supply regulators to the bottomhole of each injection well of the IPW, temperature and pressure sensors on various sections of the oil-bearing formation near the bottomhole of the IPW, sensors for the composition of the extracted products at the mouth of each production pipe of the IPW, a separator of oil products from water on the day surface, an automated process control system (APCS), which controls flow rate regulators and pressure at (IPW) in accordance with the field development program, based on the sensor readings and mathematical models of the field development.

EFFECT: increase of unconventional oil recovery factor (ORF), including high-viscosity and heavy oil, from deep wells.

5 cl, 3 dwg, 4 ex