METHOD TO EXTRACT HIGH-VISCOSITY OIL FROM OIL ACCUMULATION Russian patent published in 2010 - IPC E21B43/24 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil-and-gas industry, namely to methods of developing oil deposits using heat carriers for high-viscosity oil. Proposed method comprises extracting oil from accumulation exposed by a system of injection and drainage wells in compliance with five-, seven or nine-point development downhole element, injecting preset amount of heat carrier into given accumulation element via injection and extraction wells, systematic injection of heat carrier into injection well, and cyclic injection into extraction wells, heat carrier injection and oil extraction functions being alternated In compliance with this invention, distance between injection and extraction wells is taken to make not over 200 metres Lateral wellbores are drilled in radial direction from injection well in production formation bottom, their length making 0.3 to 0.35 of the distance between injection and extraction wells equidistant from two adjacent extraction wells Note here that designed volume of heat carrier is taken to make 0.3 to 0.5 of threshold volume of producing formation.

EFFECT: higher rate of production and final oil yield, comprehensive heat effect on oil formation via injection and extraction wells

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