DEVELOPMENT METHOD FOR HIGH-VISCOSITY OIL OR BITUMEN FIELD Russian patent published in 2015 - IPC E21B43/24 E21B43/22 

FIELD: oil and gas industry.

SUBSTANCE: method of high-viscosity oil or bitumen field development involves construction of two horizontal wells, one above the other, steam injection to the reservoir, reservoir heating by steam pocket formation, steam and hydrocarbon solvent injection to horizontal injector, and product sweeping from horizontal producer. Associated gas is used as hydrocarbon solvent. Steam and associated gas are injected in sequence in cycles. Steam is injected to the reservoir until extracted product viscosity is 3-5 times higher than initial viscosity at the cycle start, associated gas injection is started along with product extraction until extracted product temperature is reduced by 10-25%, then steam and associated gas injection cycles are repeated.

EFFECT: expanded reservoir coverage, higher level of high-viscosity oil and bitumen production along with material and power cost reduction.

1 ex, 1 dwg