PROCEDURE FOR EXTRACTION OF LIQUID HYDROCARBON PRODUCTS FROM UNDERGROUND DEPOSIT (VERSIONS) Russian patent published in 2009 - IPC E21B43/243 

FIELD: mining.

SUBSTANCE: according to one version procedure consists in assembly of at least one pressure well for pumping gas-oxidant into underground reservoir, in assembly of at least one producing well with mainly one horizontal section and mainly one vertical well connected with it, also mainly horizontal section passes in direction to pressure well and has wellhead in direct vicinity from connection of horizontal section with vertical producing well and bottomhole at another end, which is located closer to pressure well, than to wellhead; in pressurisation of gas-oxidant through pressure well for initiating in-situ combustion, at which gaseous combustion products are generated so, that there is facilitated their advance in form of front mainly perpendicular to horizontal section; also fluids flow into horizontal section; further procedure consists in arrangement of pressurisation pipe in vertical part and in at least part of horizontal section of producing well; this pipe pressurises steam, water or non-oxidising gas into horizontal section of producing well near firing front formed at certain distance along horizontal section of producing well; procedure consists in pressurisation of medium chosen from group containing steam, water and or non-oxidising gas via pipe to bottomhole of horizontal section of producing well, in changing zone of pressurisation of steam, water or non-oxidising gas due to pipe displacement relative to horizontal section; and in extraction of hydrocarbon products via horizontal section of producing well. Other versions of the procedure correspond to variations of the above said version.

EFFECT: increased efficiency of procedure due to increased consumption of oxidising gas into pressure well and eliminating its outbreak into producing well.

17 cl, 6 ex, 6 tbl, 2 dwg