METHOD FOR DEVELOPMENT OF ASH-NONUNIFORM DEPOSIT OF HIGH-VISCOSITY OIL OR BITUMEN Russian patent published in 2018 - IPC E21B43/24 E21B7/04 

FIELD: oil and gas industry.

SUBSTANCE: method for developing the ash-nonuniform deposit of highly viscosity oil or bitumen includes determining zones of different permeability in the deposit, conducting construction above the water-oil contact of the horizontal well with the additional wellbores to open low permeability zones, pumping heat-transfer medium and extracting the product. Additional wellbores are drilled in one horizontal plane with main horizontal well into low permeability zones with permeability two times lower and more with respect to average permeability of the deposit. Injection of steam is carried out by pressure not exceeding the pressure of formation hydraulic fracturing, in volume not less than 10 t per 1 m of total length of horizontal section of the main wellbore and additional wellbores, and extracting at pressure not lower than destruction pressure of walls of additional wellbores, in addition between pumping and extracting, thermal capillary impregnation of the deposit is performed.

EFFECT: involvement in the development of low permeability zones, increased homogeneity of displacement, increased coverage by the exposure, creation of uniform steam chamber in the nonuniform permeability formation.

1 dwg, 1 ex