METHOD OF FILTER REGENERATION AND BOTTOMHOLE FORMATION ZONE CLEANING Russian patent published in 2024 - IPC E21B37/08 E21B37/06 

FIELD: gas industry.

SUBSTANCE: invention relates to methods of increasing efficiency of production wells at gas deposits and underground gas storages. When implementing the method, at the first stage, mud sediments are removed at the well bottom by flushing the bottomhole formation zone (BFZ) with service water, after that, at the second stage, process fluid based on aqueous solution of hydrogen peroxide is pumped into the bottomhole formation zone. Volume of process liquid is selected so that the height of the liquid column of the pumped process liquid is higher than the upper part of the anti-sand filter, then reaction products are washed. At the third stage, a process fluid based on an aqueous solution of sodium dithionite is pumped to create a reagent bath, wherein its volume is selected so that the height of the liquid column of the pumped process fluid based on the aqueous solution of sodium dithionite is higher than the upper part of the anti-sand filter, then reaction products are washed. At the fourth stage, a process fluid is pumped, prepared on the basis of an aqueous solution of sulphamic acid with a complexing substance, and forcing it into the formation for destruction of carbonate and sulphate colmatants both on the surface of the anti-sand filter and in the reservoir formation, then, said process fluid is held for a preset period of time, the well is flushed from reaction products, developed and put into operation.

EFFECT: increasing well productivity due to destruction of carbonate, sulphate, ferruginous and clayey colmatants on surface of anti-sand filter, higher efficiency of cleaning of well formation zone and reservoir formation.

1 cl