DEVELOPMENT METHOD OF SUPER-VISCOUS OIL DEPOSIT Russian patent published in 2020 - IPC E21B43/24 E21B7/04 E21B47/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the development of oil deposits. In method of super-viscous oil deposit development, which involves drilling of rows of wells with parallel in horizontal plane shafts, drilled towards each other in staggered order, performing two-stage cyclic pumping of heat carrier and production of oil by wells. At the first stage of the cycle the heat carrier is pumped to odd wells of the row and oil is extracted from even wells of the row, after that the wells are stopped for the period of impregnation of the collector. At the second stage of the cycle the heat carrier is pumped into even wells of the row and oil is extracted from odd wells of the row, after that wells are stopped for the period of impregnation of the collector. Repeating cycle several times. Above wells with horizontal boreholes are drilled in the lower part of the deposit with overlapping of the bottomhole part of the corresponding wells drilled towards each other by 15–35 m and with distance of 60–100 m between nearby unidirectional horizontal boreholes. Well mouths are equipped with temperature sensors. Optimal extraction temperature is determined, at which the maximum production rate is observed and heat carrier breakthrough into nearby wellbores is excluded. From cycle to cycle time and / or volume of heat carrier pumping is maintained as before, while maintaining optimum extraction temperature, time and / or volume of heat carrier pumping is increased at temperature drop below optimum extraction temperature, time and / or volume of heat carrier pumping is reduced at temperature increase above optimal temperature of extraction.

EFFECT: effective warming up of bottomhole zones of wells, increase of formation coverage by 80–90 %.

1 cl, 1 dwg