METHOD OF HIGH-VISCOSITY OIL FIELD PRODUCTION WITH HORIZONTAL WELLS Russian patent published in 2015 - IPC E21B43/24 E21B7/06 

FIELD: oil and gas industry.

SUBSTANCE: method of high-viscosity oil field production with horizontal wells involves drilling of two horizontal wells, injector and producer, in the oil reservoir thickness. Producer is positioned below injector level, steam is injected to the injector and oil is swept from producer, presence of bottom water is checked, and if present, minimum height of producer path above water and oil interface, optimum distance between producer and injector, minimum distance from injector to formation top, and optimum thickness of oil reservoir allowing for parallel position of the producer and injector in the same vertical plane are determined, and if oil reservoir thickness drops below the optimum, injector drilling path in the oil reservoir space against the producer is modified by reducing the vertical distance between the wells, and injector is lead away from the producer in horizontal plane with account of reservoir anisotropy, preserving permeability gradient between the injector and producer.

EFFECT: enhanced efficiency of thermal effect on field with low constant and variable thickness of oil reservoir.

2 tbl, 1 ex, 3 dwg