METHOD FOR INJECTION CAPACITY PROFILE ALIGNMENT IN INJECTION WELLS WITH FOAM-FORMING COMPOSITION (VERSIONS) Russian patent published in 2021 - IPC E21B43/22 C09K8/68 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and can be used in alignment of injectivity profile of injection wells with foaming agents. Disclosed is method of injectivity profile quenching in injection wells with foam-forming composition includes preparation and foaming agent pumping, which contains foaming agent – high-molecular surfactant, stabilizer and water. Stabilizer used is guar polysaccharide, magnesium oxide and chromium acetate, with the following ratio of components, wt%: high-molecular surfactant 0.2–2.0; guar polysaccharide 0.2–0.3; chromium acetate 0.02; magnesium oxide 0.02; water – balance. When preparing the foam-forming composition, firstly mixing the guar polysaccharide and magnesium oxide with simultaneous water supply, high-molecular surfactant and chromium acetate are added to the obtained suspension, after pumping the foaming composition, water is pumped in the volume of the tubing. According to the second version, the stabilizer used is guar polysaccharide with polyacrylamide.

EFFECT: improving efficiency of injectivity profile alignment of injection wells due to involvement in development of low-permeable oil-saturated zones of formation by pumping foam-forming composition, increased coverage of the formation by water flooding and increased oil recovery, as well as expansion of technological capabilities of the method.

4 cl, 1 tbl