METHOD OF CREATING UNDERGROUND GAS STORAGE IN WATER-BEARING GEOLOGIC STRUCTURE Russian patent published in 2016 - IPC E21B43/00 B65G5/00 

FIELD: gas industry.

SUBSTANCE: invention relates to underground storage of natural gas in water-bearing geological structures and, in particular, to physical-chemical methods of controlling formation and subsequent gas-dynamic state of underground gas storage in such structures. Method comprises drilling wells in roof area of water-bearing structure. Through said wells feeding natural gas until reaching boundary of gas-water contact hypsometric marks corresponding to design volume of storage. Further, injecting through drilled well in area of gas-water contact foaming aqueous solution of surfactants. Then in area of water-bearing structure lying below gas-water contact, non-hydrocarbon gas is pumped, close in its physical-chemical properties to natural gas. Volume of water solution of surfactant and non-hydrocarbon gas is selected proceeding from ratio 1:1÷6, ensuring formation during cyclic extraction and pumping of natural gas of stable formation of insulating screen of foam obtained as a result of mechanical mixing of aqueous solution of foaming surfactant and non-hydrocarbon gas at their joint filtration in porous medium. Screen is created from foam of low permeability and thickness determined from condition of screening-filtration through bottom water with intense gas extraction from storage during 90-120 days.

EFFECT: technical result is increased efficiency of natural gas storage due to its gas-dynamic stability.

1 cl, 3 tbl, 1 dwg