METHOD OF PROCESSING GAS WELLS OF UNDERGROUND GAS STORAGES Russian patent published in 2020 - IPC E21B43/22 C09K8/52 C09K8/528 

FIELD: oil and gas industry.

SUBSTANCE: method of processing gas wells of underground gas storages relates to gas industry. In the disclosed method, at the first stage, a process liquid is injected into the tubing string, prepared based on an aqueous solution of hydrochloric acid, to create reagent bath for destructing colmatant on wire bottomhole sand screen. Then, UGS gas well is left to process sludge for chemical interaction between said injected process fluid and colmatant. Thereafter products of said chemical reaction are removed. At the second stage, the process liquid is again pumped to the tubing string, which is prepared on the basis of aqueous solution of hydrochloric acid, and is pumped into the formation to destroy the colmatant formed in the zone of the gravel-precoat filter and the natural reservoir-collector. At the completion of the second stage, gas-dynamic investigations of the gas well UGS are performed, which consist in conducting investigations at different modes, during which dependence of gas flow rate from depression on the formation and pressure on the mouth of the above well is determined. In case the UGS well flow rate after the above first and second processing stages does not reach the design value, additional treatment of UGS gas well with process liquid prepared on the basis of aqueous solution of caustic soda with a complexing substance is carried out, successively performing operations similar to operations performed at the above first and second stages of treatment.

EFFECT: higher efficiency of UGS wells.

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