HIGH-VISCOSITY OIL PRODUCTION METHOD Russian patent published in 2007 - IPC E21B43/24 

FIELD: oil production, particularly to produce high-viscosity oil with the use of horizontal and vertical well system and thermal reservoir treatment.

SUBSTANCE: method involves installing perforated casing pipe in previously drilled horizontal well; cementing casing pipe up to horizontal section; drilling additional vertical well, which crosses end horizontal section of previously drilled one and communicating the wells; supplying heat carrier in horizontal well through flow string in beginning of horizontal section; producing well product from vertical well to provide predetermined intake capacity; continuing heat carrier supply in reservoir up to oil viscosity reduction in area located around horizontal well section bore; performing well shutdown to provide thermal capillary infiltration; extracting product from vertical well to calculated output decrease along with maintaining dynamic level below well crossing; repeating above supply-shutdown-extraction cycle to provide bottomhole zone drainage.

EFFECT: increased oil flow from reservoir in well due to decreased back pressure, decreased heat losses due to reduced heat carrier efflux from well during well product lifting.

2 dwg