APPLICATION AND METHOD OF STABILITY INCREASE OF FOAM Russian patent published in 2017 - IPC E21B43/22 C09K8/584 C09K8/594 

FIELD: oil and gas industry.

SUBSTANCE: method for increasing oil production from an oil formation inside a reservoir, comprising: (a) the introduction of foaming composition comprising an alpha-olefin sulfonate into the oil formation under pressure, (b) introduction of gas into the oil formation under pressure, wherein the presence of the foaming composition influences gas flow within the oil formation, and (c) extraction of oil through a wellbore in the reservoir, wherein the foaming composition comprises a foam stabiliser selected from alkylamidopropyl-hydroxysulfobetaine or alkyl-hydroxysulfobetaine, wherein the alkyl group is a group that contains from about 10 carbon atoms to about 24 carbon atoms. A method for increasing oil production from an oil formation inside a reservoir, comprising: (a) introducing of a foaming composition containing an alpha-olefin sulfonate into the oil formation under pressure, (b) introduction of gas into the oil formation under pressure, wherein the presence of the foaming composition influences gas flow within the oil formation, and (c) extraction of oil through a wellbore in the reservoir, wherein the foaming composition comprises a foam stabiliser having the formula I where R₁ is an alkylamid group or a linear or branched alkyl group; R₂ and R₃ represent individually hydrogen, a methyl group or a hydroxyethyl group; R₄, R₅ and R₆ represent individually hydrogen or a hydroxy group, provided that at least one of R₄, R₅ and R₆ represents hydroxy group, wherein alkyl group represents group that contains from about 10 carbon atoms to about 24 carbon atoms. The invention has been developed in the dependent claims.

EFFECT: improved mobility control.

25 cl, 6 ex, 3 tbl