POTASSIUM SALTS MINING METHOD FROM THE UNDERGROUND DEPOSIT Russian patent published in 2017 - IPC E21B43/28 

FIELD: oil and gas industry.

SUBSTANCE: mining method of the potassium salts from the underground deposits includes introducing into the cavity, formed in the underground deposit, of the potassium salt aqueous solvent and the fluid medium immiscible with water through the pipe in the borehole, the removal of the brine with the dissolved potassium salt through the second pipe in the borehole. The action of the solvent provides the lateral expansion of the cavity forming the bug hole. The fluid medium immiscible with water forms the insulating boundary surface between the solvent and the bug hole ceiling. It is carried out the step-by-step raise of the introduction point of the potassium salt aqueous solvent and the immiscible with water fluid medium in order to provide the vertical expansion of the bug hole by the adjusting method, wherein the lateral expansion of the bug hole is repeated with every vertical raise of the bug hole. After the final raising of introduction point of the potassium salt aqueous solvent and the lateral expansion of the cavity at the given point, perform the water introduction through the holes perforated in the pipes, so as to form the drain in the bug hole ceiling for receiving of fluid medium immiscible with water, which then is discharged from the bug hole ceiling, and introduction of the second aqueous solvent to dissolve the potassium salt, which is exposed after the fluid medium immiscible with water goes out into the drain.

EFFECT: increase of the leaching efficiency without increasing the environmental impact.

8 cl, 2 dwg