METHOD FOR DEVELOPING HIGH-VISCOSITY OIL Russian patent published in 2018 - IPC E21B43/24 E21B7/04 E21B47/06 

FIELD: oil industry.

SUBSTANCE: invention relates to oil-producing industry. Technical result is a reduction of the steam-oil ratio by 1.3 times, an increase in production and extrusion sweep due to the inclusion of unaffected zones in the development and ensuring uniform production of oil reserves while maintaining the optimum temperature for sampling products in an additional well. Method for developing high-viscosity oil includes the construction of pairs of horizontal production and injection wells above one another, as well as vertical observation wells, injection of coolant through injection wells with heating of the reservoir and creation of a steam chamber, product is extracted by steam-gravity drainage via production wells, steam chamber conditions being monitored. Development is carried out by adjusting the current size of the steam chamber by changing the volumes of injection of the coolant into the injection wells and taking the liquid out of the production wells with the control of the volume of the steam chamber. Carry out construction in the zones of the least warming up between the producing wells at the level of the bottom of the reservoir or the level of water-oil contact - WOC of an additional well, through which the coolant is pumped to create a thermodynamic connection with the nearest pairs of horizontal wells with the subsequent transfer to the selection of products. Additional well is equipped with means to control the temperature of the extracted products, the boundary temperature of the production of this well is determined, at which the hydrodynamic connection with nearby producing wells deteriorates. When the temperature of the extracted products decreases from an additional well to the boundary temperature, coolant is re-pumped into it to restore the hydrodynamic connection with the nearby producing wells. After that resume selection. Next, the cycles of injection and selection in an additional well are repeated on the basis of the boundary temperature of the product taken from it.

EFFECT: technical result is a reduction in the steam-oil ratio, an increase in production and sweep coverage due to the inclusion of unaffected zones in the development and ensuring uniform production of oil reserves while maintaining the optimum temperature for sampling products in an additional well.

1 cl, 2 dwg, 1 ex