THE METHOD FOR PUMPING BINARY MIXTURES INTO THE RESERVOIR Russian patent published in 2022 - IPC E21B43/22 E21B43/24 E21B7/04 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry. The method for pumping binary mixtures into the formation includes the determination of the formation net pay, the permeability of the formation, the initial formation pressure and temperature, drilling of a horizontal well. The horizontal sidetrack is drilled in the formation above the first horizontal hole, at a distance providing hydraulic communication of the holes. Horizontal holes are separated by installing a dual completion equipment in the well. The densities of the components of the binary mixture are determined. First, a less dense component of the binary mixture is pumped – an aqueous solution of ammonium nitrate through the lower horizontal borehole, pushed through with a spacer with a decrease in the liquid level by pumping in the upper horizontal hole below the formation pressure. Then, the pressure is raised in the upper horizontal hole by pumping spacer through the annulus of the tubing and the pressure is held. Then, a denser component of the binary mixture is injected – an aqueous solution of alkali metal nitrite through the upper horizontal hole under pressure, providing gravitational flow downwards of at least 60 vol.% of the second component under gravity until the required interval between the horizontal holes is reached. Then, the pressure in the lower horizontal hole is raised by pumping spacer through a tubing into the formation and this pressure is held.

EFFECT: using of a sidetrack drilled from an existing well, reducing the consumption of binary mixture components.

1 cl, 1 ex