METHOD OF RESTORATION OF WATER-FLOODED GAS OR GAS CONDENSATE WELL AFTER HYDRAULIC FRACTURING OF FORMATION Russian patent published in 2021 - IPC E21B33/138 E21B43/32 C09K8/46 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil and gas industry and can be used for restoration of water-flooded gas or gas condensate well after hydraulic fracturing of the formation and provision of their further operation. Method involves pumping of design volume of the buffer liquid, pumping of design quantity of water-insulating composition, water-insulating composition to the formation with the use of hydrocarbon raw material, curing for hardening and strength. At that, acetone is used as a buffer liquid, while hydrocarbon gas is used as hydrocarbon raw material for water-proof composition bleeding. Pumping and pouring of water-insulating composition is performed in two stages, at the first stage water-absorbing composition is used as plugging material AKOR-BN 102 in mixture with aqueous solution of calcium chloride, reinforced with basalt fibre at following ratio of components, wt. %: AKOR-BN 102 - 15–26, calcium chloride CaCl₂ - 12–25, basalt fibre - 0.5–3.0, water - balance. Mixture is pumped with outlet into water-saturated horizon by 0.5–0.75 m. At the second stage AKOR-BN 102 is used as a waterproofing composition in a commodity form and pumped until the hydraulic fracture crack space is completely filled. During operation after well restoration there performed is constant withdrawal of residual inflow of formation water to bottomhole of the well with gas lift.

EFFECT: higher efficiency of operating wells after fracturing due to reduced influx of formation water, high flow rate and prevention of further water cut and self-squeezing, as well as increased overhaul period of wells.

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