METHOD FOR PRODUCTION OF HIGH-VISCOSITY OIL FROM OIL DEPOSIT IN PERMAFROST ZONE Russian patent published in 2015 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: method includes displacement of oil from oil formation through the injecting well and production of displaced oil through producing wells. At that the injecting well is made horizontal and placed in the central part of oil formation. Producing wells are placed in parallel to horizontal section of the injecting well at sides, from the top and bottom thus forming a spherically cylindrical zone for deposit draining. The wells are complete with tubing strings out of oil-well tubings placed in inner cavity of the production string. The upper part of the production string covering permafrost zone is made of heat-insulated tubes. The tubing strings above the oil formation roof are equipped with packers and circulating valves. Annular space of the wells is filled in with non-freezing heat-insulating packer fluid. Heat insulation of the pipes and packer fluid in the producing wells is ensured on condition of elimination of thawing in permafrost zone as well as elimination of paraffin-resin deposits and hydrates. The lower part of the tubing string placed in horizontal section of the well is made with feed-through openings and the lower part of the production string placed in horizontal section of the well is perforated so that they may interact at injection of displacement agent through the injecting well to the oil formation. The agent is heated up to temperature that does not exceed temperature of the formation.

EFFECT: improved efficiency of oil displacement from the formation at reduced time for preparation of produced product without dehydration and degassing.

3 dwg, 3 ex