Method for leveling the injectivity profile of an injection well
AssigneeLimited Liability Company Oilmind
InventorVitalii Vyacheslavovich Sergeev
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Abstract
A method for leveling the injectivity profile of an injection well involves pumping into the bottom-hole formation zone a blocking agent in the form of an emulsion system containing nanoparticles of silicon dioxide and being comprised of: 5-12 vol % diesel fuel, 2-3 vol % emulsifier, 0.25-1.0 vol % colloidal nanoparticles of silicon dioxide, with the remainder being an aqueous solution of calcium chloride or potassium chloride. 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, with the remainder being diesel fuel.
Claims6
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.
A blocking agent for injecting into a bottom hole formation zone in a form of an emulsion system containing nanoparticles of silicon dioxide, the emulsion system comprising:
- 5-12 vol % diesel fuel,
- 2-3 vol % an emulsifier,
- 0.25-0.9 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 comprisisng:
- 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;
- wherein the blocking agent redistributes filtration flows in the bottom hole formation zone, and wherein a shear gradient and a dynamic viscosity value of the emulsion system is adjustable depending upon a volumetric content of the water and a filtration rate.
Dependencies are inferred from the claim text.