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

FIELD: oil and gas industry.

SUBSTANCE: development method of high-viscosity oil and bitumen deposit involves well construction, opening of upper and lower well intervals within the formation limits, breakdown of perforation intervals in the well, cyclic pumping of the working medium in the form of steam to the formation through upper opening interval and extraction of the formation product through lower opening interval. Distance between well opening intervals is at least 5 m. Formation product is extracted constantly. Pumping of working medium is stopped when the temperature of the formation product extracted from lower interval increases to the temperature equal to 70-90% of the pumped working agent temperature. Pumping of working medium is renewed when flow rate of the extracted product decreased to unprofitable value. At that, at the distance of 50-100 m from the existing well there built is an additional well similar to the first one, which is used for constant pumping of working medium from its upper opening interval till hydrodynamic link to the first well is created; after that, lower opening interval of additional well is changed over for extraction of product, and upper interval is changed over for cyclic pumping of working medium during interruption of working medium pumping in the first well.

EFFECT: intensifying the product flow rate at early stage of development with simultaneous cheapening of the method.

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