METHOD OF HIGH-VISCOSITY OIL ACCUMULATION DEVELOPMENT Russian patent published in 2012 - IPC E21B43/243 

FIELD: oil-and-gas production.

SUBSTANCE: proposed method comprises injecting oxidiser via injection wells, producing fire flooding and oil production in production wells with horizontal shaft in reservoir bottom. Injection well bottom is located some 3-5 m above horizontal shaft. Note here that injection well opening zone is located at lower half of productive accumulation. Two opposite-direction horizontal sections are drilled from injection well into bed top section in parallel with horizontal shaft of production well. Injection well is additionally equipped with casing with parker to isolate tubular annulus above opening zone. Note also injection well casing is used to inject heat carrier while oxidiser is injected via tubular annulus, alternating with water, in amount sufficient for fire flooding. If temperature of oil from production well exceeds preset tolerance, cold incombustible gas is injected therein to reduce temperature.

EFFECT: higher yield due to higher efficiency of high-viscosity oil displacement.

1 dwg