METHOD FOR DEVELOPMENT OF HIGH-VISCOUS OIL DEPOSITS OR BITUMENS AT THERMAL EFFECT Russian patent published in 2014 - IPC E21B43/24 E21B33/138 

FIELD: oil and gas industry.

SUBSTANCE: method for development of high-viscous oil deposits or bitumens at thermal effect includes construction of a producer with a horizontal section penetrated in the productive formation, construction of an injector with a horizontal penetrated section placed over the similar section of the producer in the same formation, injection of a heat carrier to the injector and extraction of the formation product from the producer. Horizontal wells are drilled in parallel in opposite directions with placement of the bottomhole opposite the entry of the nearest horizontal well to the formation. Oil saturation is determined for the producer zone against geophysical investigations. Depending on oil saturation value a waterproofing compound is injected to the intervals with smallest values of oil saturation. In order to exclude pressure communication the above areas are isolated overlapping the neighbouring areas per 2-3 m at each side. Heat carrier is injected over the isolated section of the producer in less volume in comparison with other areas due to the fact that along the borehole of the horizontal injector the opening interval is 2 times bigger than the interval over the isolates sections of the horizontal producer in the other areas.

EFFECT: improvement of reservoir recovery, reduction of water production, reduction in volume of the injected displacing agent, maintenance of the reservoir pressure and temperature in the producer borehole.

1 dwg, 1 ex