# US 12,180,416 B2 · Method for preventing stratal water from breaking through into bottom holes of wells

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- Number: US 12,180,416 B2
- Document ID: US12180416B2
- Status: Granted
- Kind: B2
- Application number: 17/758,999
- Filed: 2020-12-08
- Published: 2023-02-02
- Granted: 2024-12-31
- Earliest claimed: 2020-01-21
- Assignees: Limited Liability Company “Gr Petroleum”
- Applicants: Limited Liability Company “Gr Petroleum”
- Inventors: Vitalii Vyacheslavovich Sergeev
- Web page: https://patentgrep.com/patent/US12180416B2

## CPC

- C09K 8/50: Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls (compositions for consolidating loose sand or the like around wells C09K8/56)
- C09K 8/506: containing organic compounds
- C09K 8/42: Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells (compositions for plastering C09K8/50)
- E21B 33/138: Plastering the borehole wall; Injecting into the formation
- E21B 43/32: Preventing gas- or water-coning phenomena, i.e. the formation of a conical column of gas or water around wells
- C09K 2208/10: Nanoparticle-containing well treatment fluids
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A method for preventing stratal water from breaking into bottom holes of gas, gas-condensate, or gas-hydrate wells includes performing an injection of a shielding agent into a bottomhole formation zone, for which an emulsion-suspension system (ESS) is used. The ESS system includes: 5-12 vol % of diesel fuel, 2-3 vol % of emulsifier, and 1.0-1.5 vol % of colloidal nano-particles of silicon dioxide, with the remainder being an aqueous solution of calcium chloride or potassium chloride. The emulsifier used is a composition comprising: 40-42 vol % of esters of linoleic or oleic acids and resin acids, 0.7-1 vol % of amine oxide, 0.5-1 vol % of lime-in-diesel fuel suspension or bentonite-in-diesel fuel suspension, with the remainder being diesel fuel.

## Claims

### Claim 1

A method for preventing stratal water from breaking into bottom holes of gas, gas-condensate, or gas-hydrate wells, comprising:
performing an injection of a shielding agent into a bottomhole formation zone to create a shield impermeable for stratal water filtering into a near-wellbore zone of a productive formation, for which an emulsion-suspension system (ESS) containing colloidal nanoparticles of silicon dioxide is used, the system comprising:
5-12 vol % diesel fuel,
2-3 vol % emulsifier,
1.0-1.5 vol % colloidal nanoparticles of silicon dioxide,
and the rest of the emulsion-suspension system being an aqueous solution of calcium chloride or potassium chloride,
wherein the emulsifier comprises:
40-42 vol % esters of linoleic or oleic acids,
0.7-1 vol % amine oxide,
0.5-1 vol % lime-in-diesel fuel suspension or bentonite-in-diesel fuel suspension, and the rest being diesel fuel, and
wherein the colloidal nanoparticles of silicon dioxide comprise:
31-32.5 vol % silicon dioxide in 67-68 vol % propylene glycol monomethyl ether, and the rest being water, or
30-31 vol % silicon dioxide in 67-68 vol % isopropanol and the rest being methyl alcohol, or
29-31 vol % silicon dioxide in ethylene glycol, and the rest being ethylene glycol.

### Claim 2

An emulsion-suspension system (ESS) for preventing stratal water from breaking into bottom holes of gas, gas-condensate, or gas-hydrate wells, containing colloidal nanoparticles of silicon dioxide, the system comprising:
5-12 vol % diesel fuel,
2-3 vol % emulsifier,
1.0-1.5 vol % colloidal nanoparticles of silicon dioxide,
and the rest of the emulsion-suspension system being an aqueous solution of calcium chloride or potassium chloride,
wherein the emulsifier comprises:
40-42 vol % esters of linoleic or oleic acids and resin acids,
0.7-1 vol % amine oxide,
0.5-1 vol % lime-in-diesel fuel suspension or bentonite-in-diesel fuel suspension, and the rest being diesel fuel, and
wherein the colloidal nanoparticles of silicon dioxide comprise:
31-32.5 vol % silicon dioxide in 67-68 vol % propylene glycol monomethyl ether, and the rest being water,
or
30-31 vol % silicon dioxide in 67-68 vol % isopropanol and the rest being methyl alcohol,
or
29-31 vol % silicon dioxide in ethylene glycol, and the rest being ethylene glycol, wherein the ESS forms a shield impermeable for stratal water filtering into a near-wellbore zone of a productive formation.