COMPOSITION FOR PROCESSING THE BOTTOM-HOLE ZONE OF CARBONATE AND TERRIGENOUS RESERVOIRS Russian patent published in 2022 - IPC C09K8/74 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry, namely to process fluids for chemical methods for increasing oil recovery and processing the bottom-hole zone of producing and injection wells and can be used in the processing of carbonate and terrigenous reservoirs in order to intensify the inflow of reservoir oil. The composition for the processing of the bottom-hole zone of carbonate and terrigenous reservoirs contains, wt. %: a complex compound of hydrofluoric acid salt with hydrogen peroxide 5-20; ammonium fluoride anhydrous 5-10; water the rest. Moreover, as a complex compound of a salt of hydrofluoric acid with hydrogen peroxide, the composition contains potassium fluoride peroxosolvate or ammonium fluoride peroxosolvate, into which, before the vacuum drying stage or at the vacuum drying stage, a surface active agent complex is injected in an amount of 3-15, wt. %, that is a mixture of anionic, and/or nonionic, and/or amphoteric surface active agents with a degree of oxyethylation from 6 to 12 and a hydrocarbon radical from 6 to 10 in a solvent. This complex compound is obtained by mixing potassium fluoride or ammonium fluoride salt in an amount from 30.8 to 62.5, wt. %, with hydrogen peroxide in an amount from 22.5 to 61, wt. %, and vacuum drying of the solution, before or during which a surface active agent complex is introduced in an amount from 3 to 15 wt.%.

EFFECT: increase in the restored permeability of the porous space of the productive reservoir, which makes it possible to intensify the inflow of oil, increasing the flow rate of the well by more than 80%, increasing the compatibility of the composition with reservoir oils of various chemical composition and rheology, eliminating the need to introduce more additives into the composition, simplifying the processes of transportation and application of the composition.

3 cl, 1 tbl, 3 ex