MULTIFUNCTIONAL WELL FOR EXTRACTION OF HIGH-VISCOSITY OIL Russian patent published in 2019 - IPC E21B36/00 E21B43/00 E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to development of oil reservoirs using multifunctional wells combining functions of both injection and production wells. Multifunctional well for extraction of high-viscosity oil contains a casing with a horizontal shaft, a flow column with a subsurface pump located up to the horizontal bore of the well, and a column for pumping of a displacing heat agent with heat insulation. At the same time the column for pumping of displacement thermal agent is heat-insulated in two intervals along its length: from the wellhead to liquid level in the inter-tube space of the well (IS) and from the upper boundary of the depth pump location to the horizontal wellbore. Note here that flow column is heat-insulated from well head to liquid level in IS.

EFFECT: raised efficiency of reservoir oil temperature preservation higher than paraffin oil saturation temperature, reduced pump power consumption.

1 cl, 1 dwg, 1 tbl, 1 ex