US 12,305,117 B2
Method for leveling the injectivity profile of an injection well
Vitalii Vyacheslavovich Sergeev, Moscow (RU)
Assigned to LIMITED LIABILITY COMPANY OILMIND, Moscow (RU)
Appl. No. 17/906,931
Filed by LIMITED LIABILITY COMPANY OILMIND, Moscow (RU)
PCT Filed Feb. 26, 2021, PCT No. PCT/RU2021/050050
§ 371(c)(1), (2) Date Sep. 21, 2022,
PCT Pub. No. WO2021/194390, PCT Pub. Date Sep. 30, 2021.
Claims priority of application No. RU2020112178 (RU), filed on Mar. 25, 2020.
Prior Publication US 2023/0126946 A1, Apr. 27, 2023
Int. Cl. C09K 8/50 (2006.01); C09K 23/34 (2022.01); E21B 33/138 (2006.01); E21B 43/32 (2006.01); B82Y 30/00 (2011.01)
CPC C09K 8/50 (2013.01) [C09K 23/34 (2022.01); E21B 33/138 (2013.01); E21B 43/32 (2013.01); B82Y 30/00 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for leveling an injectivity profile of an injection well, comprising:
injecting a blocking agent in a form of an emulsion system containing nanoparticles of silicon dioxide into a bottom hole formation zone; and
redistributing filtration flows in the bottom hole formation zone to level the injectivity profile,
wherein the emulsion system comprises:
5-12 vol % diesel fuel,
2-3 vol % an emulsifier,
0.25-1.0 vol % colloidal nanoparticles of silicon dioxide,
and the rest of the emulsion system being an aqueous solution of calcium chloride or potassium chloride,
wherein:
the emulsifier is in the form of a composition comprising:
40-42 vol % esters of linoleic or oleic acids and resin acids,
0.7-1 vol % amine oxide,
0.5-1 vol % suspension of lime in diesel fuel or suspension of bentonite in diesel fuel,
and the rest being diesel fuel,
wherein the colloidal nanoparticles of silicon dioxide are in the form of a composition comprising:
30-32 vol % silicon dioxide in 67-68 vol % propylene glycol monomethyl ether and the rest being water,
or
29-31 vol % silicon dioxide in 67-69 vol % isopropanol and the rest being methyl alcohol,
or
29-31 vol % silicon dioxide in ethylene glycol, wherein ethylene glycol being the rest.