METHOD OF EXTRACTION OF LIQUID HYDROCARBONS FROM UNDERGROUND FORMATION (VERSIONS) Russian patent published in 2010 - IPC E21B43/243 

FIELD: oil and gas industry.

SUBSTANCE: method involves provision of injection well for the oxidising gas to be pumped to underground formation, provision of production well having mainly the horizontal section and mainly vertical production well connected to it. At that, in general, horizontal section extends to injection well. At that, reference point of horizontal section is located near the connection with vertical production well, and end point is located on opposite end of horizontal section. At that, end point is located closer to injection well than the reference point is; oxidising gas is pumped through injection well to perform in-situ combustion so that gaseous combustion products appear and constantly move on in the form of the front mainly perpendicular to horizontal section in direction from end point to reference point of horizontal section, and fluids are supplied to horizontal section; provision of tubing string in production well inside the above vertical section and at least some part of horizontal section for production well near the combustion front appearing at the distance in horizontal plane along horizontal section of production well is made; hydrocarbon condensate is pumped to tubing string so that condensate moves close to the end point of horizontal section via tubing string; hydrocarbons are removed from production well in its horizontal section.

EFFECT: increasing the efficiency of the method.

20 cl, 7 ex, 7 tbl, 3 dwg