METHOD FOR DEVELOPING A DEPOSIT OF EXTRA-VISCOUS OIL Russian patent published in 2022 - IPC E21B43/24 E21B7/04 E21B47/06 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry. A method for developing a superviscous oil deposit includes building pairs of horizontal injection and production wells located one above the other, as well as vertical observation wells, pumping a coolant through injection wells with heating the productive formation and creating a steam chamber, withdrawing products due to steam gravity drainage through production wells, developing with regulation of the current size of the steam chamber by changing the volumes of coolant injection and liquid withdrawal. In the deposit, anomalous areas are also determined in with a productive formation thickness of less than 10 m, in which additional wells are located at a distance of 50±15 m from a nearby production well, while additional wells are drilled parallel to the adjacent production well, placing the bottoms of additional wells in the direction of the bottoms of paired horizontal production and injection wells in such a way that the distance from the bottoms of paired production and injection wells to the trunk of an additional well is 30±10 m. The coolant is pumped through additional wells until a thermodynamic connection with the nearest pair of horizontal wells is created, followed by transfer to product extraction. The boundary temperature of the production of an additional well is determined, at which the hydrodynamic connection with a nearby production well deteriorates. The coolant is re-injected to restore hydrodynamic connection with a nearby production well when the temperature of the produced product from the additional well decreases to the boundary temperature, then the production is resumed. The injection and withdrawal cycles are repeated in an additional well. Each next time interval of selection is increased in comparison with the previous one. Selection from an additional well is carried out until a boundary temperature of 40±10°C is reached.

EFFECT: increasing the efficiency of developing extra-viscous oil deposits in areas of extra-viscous oil deposits with a productive formation thickness of less than 10 m, as well as located in the toe area of ​​a number of pairs of wells operated using the steam gravity drainage technology.

1 cl, 2 dwg, 3 ex