METHOD FOR HIGHLY-VISCOUS OIL AND BITUMEN PRODUCTION Russian patent published in 2008 - IPC E21B43/24 

FIELD: hydrocarbon production, particularly highly-viscous oil or bitumen production with the use of double-wellhead wells.

SUBSTANCE: method involves drilling producing double-wellhead well; consolidating thereof with production string having perforated section located in productive reservoir; arranging piston with power pull-rods connected with driving unit at wellheads inside well, wherein the piston may perform reversible sliding inside well; lifting and supplying well product in discharge line to one wellhead of producing well. Injection well having profile parallel to that of producing well is additionally drilled. The injection well is cased with production string having perforation part arranged in the same productive reservoir over producing well. Piston is arranged so that it may directly cooperate with production string of producing well and may perform reversed movement within the limits thereof. Piston movement speed provides viscous oil and bitumen production rate exceeding reverse oil filtration in reservoir from well interior in front of moving piston. Installed on pull-rods are downhole tools for temperature and pressure control during product extraction from producing well and accumulation in discharge line and at the second wellhead of producing well. Heat-carrier is simultaneously injected via two channels of two concentric tubing strings. Tubing string with lesser diameter has length exceeding that of another one.

EFFECT: elimination of sand precipitation and sand plug accumulation in horizontal producing well, increased output and increased efficiency due to instrumental monitoring and control of thermal productive reservoir treatment.

3 cl, 4 dwg