THERMOSHAFT HIGH-VISCOSITY OIL DEVELOPMENT METHOD Russian patent published in 2017 - IPC E21B43/24 E21C41/24 

FIELD: oil and gas industry.

SUBSTANCE: thermoshaft method for high-viscosity oil development includes heat carrier injection into injection wells of slope oil well block, and subsequent oil extraction. Technological oil extraction mode through production wells is carried out cyclically, alternating with regime of oil accumulation in wells and adjusting the air flow for ventilation of mine workings for each mode. Wherein the air flow is determined depending on thermal factor formed from constant and varying heat flow from the formula Q_a=G_aρ_a, where Q_a is air flow of main ventilation fan, m³/sec; ρ_a is air density in mine workings; G_a is mass of air flowing through mine workings, kg/s, determined by the formula wherein c_a is specific heat of air, ΔT_"г.р." is boundary conditions temperature difference, °C; Q_h.f. is heat flow capacity, kW. Air supply control is carried out via main fan installation in manual and automatic modes. Air supply to mine workings is reduced in oil accumulation mode with closed production wells valves, and full supply of calculated amount of air is carried out in oil extraction mode with open production wells valves.

EFFECT: improved energy efficiency of development method.

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