HIGH-VISCOSITY OIL DEPOSIT DEVELOPMENT METHOD Russian patent published in 2011 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: in development method of high-viscosity oil deposit, which involves oxidiser pumping through injection wells, arrangement of in-situ combustion and extraction of product through production wells with horizontal shaft at bottom of formation, on two sides in two rows from production well along triangular grid there built are vertical control wells and a pair of vertical control wells in the area of head and bottom hole of production well at the distance from the head and bottom hole of not less than 7-10 m. Bottom hole of injection well is located 3-5 m higher than horizontal shaft; at that, uncovering zone of injection well is located in lower half of productive formation; in roof part of formation from injection well there provided are two differently directed side radial channels parallel to horizontal shaft of production well. In addition, injection well is equipped with pipe string with packer insulating the inter-pipe space above the uncovering zone. Via pipe string, to rows of control wells located close to production well and to wells located in the area of head and bottom hole of production well, there pumped is heat carrier, and oxidiser is pumped via inter-pipe space of injection well in turn with water, in proportions sufficient to maintain in-situ combustion. At that, the rest control wells are changed over to production wells. In case temperature of extracted product from production well exceeds maximum allowable value, cold non-combustible gas or reagent is pumped via pipe string till product temperature is decreased, and rows of control wells located close to production well are switched over to production wells. When product temperature is exceeded in one or several vertical control wells above allowable, cold non-combustible gas or reagent is pumped until the temperature decreases.

EFFECT: increasing efficiency of displacement process of high-viscosity oil owing to possibility of controlling the temperature of the product extracted from production well and controlling the fluid flow - formation product direction.

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