METHOD FOR DEVELOPMENT OF HIGHLY VISCOUS OIL POOL UNDERLAID BY WATER Russian patent published in 2009 - IPC E21B43/24 

FIELD: oil and gas production.

SUBSTANCE: invention is related to oil industry and may be used in development of oil deposits that contain highly viscous and superviscous oils and having underlaying water-bearing bed. Pool is opened by vertical producing and injecting wells. Thirteen-point reversible element of development is put in operation, and it consists of single injecting well located in element centre, and 12 producing wells located along internal and external concentric orbits. Coolant is cyclically pumped, and produce is extracted through producing wells. Deposit is opened down to water-bearing bed. Coolant pumping is done into water-bearing bed through injection well and cyclically through producing wells. Besides, in initial period of deposit operation the first pair of radially located producing wells is transferred for coolant injection into water-bearing bed to the moment of average temperature balancing in water-bearing bed with temperature of pumped coolant with rate that provides for balancing of filtration flow speed initiated by operation of the main injecting well, and speed of heating front motion. Then coolant pumping into water-bearing bed through pair of radially located producing wells is stopped, operation is interrupted, and producing wells are held still, those used to pump coolant to balance temperature in water-bearing and oil-bearing parts of deposit. Then producing wells, through which coolant was injected, are transferred for produce extraction, and the following pair of radially located producing wells is transferred for injection.

EFFECT: higher efficiency of bed oil recovery coefficient due to increased rate of payout bed heating with underlaying water-bearing bed, area of payout bed recovery coverage, and also method simplification.

2 tbl, 5 dwg, 1 ex