# US 10,767,094 B2 · Nanosilica dispersion well treatment fluid

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- Number: US 10,767,094 B2
- Document ID: US10767094B2
- Status: Granted
- Kind: B2
- Application number: 16/594,612
- Filed: 2019-10-07
- Published: 2020-02-13
- Granted: 2020-09-08
- Earliest claimed: 2017-02-03
- Assignees: Saudi Arabian Oil Company
- Applicants: Saudi Arabian Oil Company
- Inventors: Vikrant Wagle; Abdullah Al-Yami
- Web page: https://patentgrep.com/patent/US10767094B2

## CPC

- C09K 8/032: {Inorganic additives}
- C09K 8/035: Organic additives
- C09K 8/5045: {containing inorganic compounds}
- C09K 8/506: containing organic compounds
- E21B 21/003: {Means for stopping loss of drilling fluid (plastering the borehole wall E21B33/138)}
- E21B 33/138: Plastering the borehole wall; Injecting into the formation
- C09K 2208/08: Fiber-containing well treatment fluids
- 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 well treatment fluid is provided having an acidic nanosilica dispersion and an alkanolamine. The nanosilica dispersion and the alkanolamine may form a gelled solid after interaction over a period. Methods of reducing water production using the well treatment fluids are also provided.

## Claims

### Claim 1

A treatment fluid for reducing water production in a treatment zone in a wellbore, comprising:
an acidic nanosilica dispersion, the acidic nanosilica dispersion comprising amorphous silicon dioxide, water, and acetic acid; and
an alkanolamine, the alkanolamine selected to form a gelled solid after interaction with the acidic nanosilica dispersion for a period,
wherein the acidic nanosilica dispersion has a pH of less than 7 before interaction with the alkanolamine and a pH of at least 9 after the treatment fluid contacts the treatment zone in the carbonate formation.

### Claim 2 (depends on 1)

The treatment fluid of claim 1, wherein the period comprises a range of 0.5 hours to 24 hours.

### Claim 3 (depends on 1)

The treatment fluid of claim 1, consisting of the acidic nanosilica dispersion and the alkanolamine.

### Claim 4 (depends on 1)

The treatment fluid of claim 1, wherein the acidic nanosilica dispersion comprises amorphous silicon dioxide in the range of 5% w/w to about 50% w/w.

### Claim 5 (depends on 4)

The treatment fluid of claim 4, wherein the acidic nanosilica dispersion comprises water in the range of 50 w/w % to 95 w/w %.

### Claim 6 (depends on 1)

The treatment fluid of claim 1, wherein the alkanolamine comprises monoethanolamine.