METHOD FOR HEAVY AND HIGHLY-VISCOUS HYDROCARBON PRODUCTION FROM UNDERGROUND DEPOSIT Russian patent published in 2008 - IPC E21B43/24 

FIELD: underground hydrocarbon production, particularly enhanced recovery methods for obtaining hydrocarbons using heat.

SUBSTANCE: method involves drilling and preparing injection wells provided with horizontal end section and producing wells having horizontal end sections for further operation, wherein producing wells are drilled under injection well level and are adapted to produce hydrocarbons; creating permeable zone between injection and producing wells. Injection and producing wells in amount of not less than one pair are drilled in accordance with one pattern so that specified space is created in-between. Several horizontal end sections are drilled in injection and producing wells so that the end sections of each well are located in single plane and are uniformly distributed along the full perimeter thereof. Distance between horizontal end section plane of injection well and that of producing well is at least 5 m in height direction. Each injection well is provided with heat-insulated pipe string for heat-carrier supply. The heat-insulated pipe string is lowered in well in branched well area.

EFFECT: increased method simplicity and efficiency due to extended deposit coverage with horizontal well sections.

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