METHOD FOR THERMO-MINING EXTRACTION OF A DEPOSIT OF HIGHLY VISCOUS OIL BY MEANS OF BRANCHING WELLS IN ACCORDANCE TO ONE-LEVEL SYSTEM Russian patent published in 2006 - IPC E21B43/24 

FIELD: oil industry, possible use during thermo-mining extraction of deposits of high-viscosity oil.

SUBSTANCE: in the area of deposit on foot wall of oil bed or below it extracting gallery is constructed. Subterranean slightly inclined or horizontal branching force wells are drilled from extracting gallery. From the surface into extracting gallery steam-feeding well is drilled, from which steam along subterranean steam duct is fed to mouths of subterranean force wells. In spaces between subterranean force wells, subterranean slightly inclined or horizontal branching extracting wells are drilled. Steam is forced into oil bed through the system of surface steam-feeding wells, subterranean pipelines and subterranean extracting wells. Bed fluid is drained through subterranean extracting wells. When steam feeding into subterranean force wells is stopped, these wells are used in oil extraction mode. Mouths of subterranean forcing and product wells are cased by thermo-insulated columns. When steam feeding into branching force wells is stopped, these wells are used in oil extraction mode.

EFFECT: increased speed of extraction of oil deposit, preserved thermal conditions in extracting gallery.

1 ex, 1 dwg