DEVELOPMENT METHOD OF HIGH-VISCOSITY OIL DEPOSIT Russian patent published in 2012 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: in development method of high-viscosity oil, which involves pumping of oxidiser through injection wells, arrangement of in-situ combustion and withdrawal of products through production wells with horizontal shaft in suspended part of the formation, vertical control wells on both sides in two tiers from production well along triangular pattern and one vertical control well at the distance of not less than 7-10 m are built. Injection well is located at the distance of not less than 7-10 m from the end part of horizontal shaft of production well. Opening-up zone of injection well is located in lower half of productive formation. In the roof part of the formation a radial side channel is provided from injection well towards horizontal shaft of production well. In addition, injection well is equipped with a pipe string with packer insulating the inter-tube space above the opening-up zone. Heat carrier is pumped via the pipe string of injection well, which is located near rows of control wells and to the well located in the area of the production well head. Oxidiser is pumped via inter-tube space of injection well located in the end part of horizontal shaft of production well, alternating with water, in proportions sufficient to maintain in-situ combustion. At that, the rest control wells are converted to production wells. In cases when the temperature of the product extracted from production well exceeds maximum allowable value, cold incombustible gas or reagent is pumped via the pipe string of injection vertical well located in the end part of horizontal shaft of production well till the product temperature decreases, and rows of control wells located near the production well are converted to production wells. When the product temperature increases in one or several vertical control wells above allowable temperature, they are converted to injection of cold incombustible gas or reagent till the temperature is decreased.

EFFECT: increasing the efficiency of high-viscosity oil displacement process due to possible temperature control of the product extracted from production well, and control of direction of fluid flow - formation product.

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