# US 11,028,311 B2 · Methods of cementing a wellbore

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,028,311 B2
- Document ID: US11028311B2
- Status: Granted
- Kind: B2
- Application number: 16/835,620
- Filed: 2020-03-31
- Published: 2020-10-29
- Granted: 2021-06-08
- Earliest claimed: 2019-04-26
- Assignees: Baker Hughes Oilfield Operations LLC
- Applicants: Thomas S. Sodhi
- Inventors: Thomas S. Sodhi
- Web page: https://patentgrep.com/patent/US11028311B2

## CPC

- C09K 8/467: containing additives for specific purposes
- C04B 24/38: Polysaccharides or derivatives thereof {(C04B24/243 takes precedence)}
- C04B 28/02: containing hydraulic cements other than calcium sulfates
- E21B 33/14: for cementing casings into boreholes
- C04B 2103/40: Surface-active agents, dispersants
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A method of cementing a wellbore comprises combining an alginate suspension additive with a cement slurry to form a cementing composition, the cement slurry comprising an aqueous carrier and a cementitious component; injecting the cementing composition into the wellbore; and allowing the cement composition to set.

## Claims

### Claim 1

A method of cementing a wellbore, the method comprising:
combining an alginate suspension additive with a cement slurry to form a cement composition, the cement slurry comprising about 10 wt. % to about 60 wt. % of an aqueous carrier and about 60 wt. % to about 90 wt. % of a cementitious component, each based on the total weight of the cement slurry;
injecting the cement composition into the wellbore; and
allowing the cement composition to set,
wherein the alginate suspension additive is added in an amount of about 0.01 wt. % to about 5 wt. % based on the weight of the aqueous carrier in the cement slurry.

### Claim 2 (depends on 1)

The method of claim 1, wherein the alginate suspension additive is added in an amount of about 0.05 wt. % to about 2 wt. % based on the weight of the aqueous carrier in the cement slurry.

### Claim 3 (depends on 1)

The method of claim 1, wherein the alginate suspension additive comprises an alginate, alginic acid, sodium alginate, potassium alginate, ammonium alginate, calcium alginate, zinc alginate, or a combination comprising at least one of the foregoing.

### Claim 4 (depends on 1)

The method of claim 1, wherein the alginate suspension additive comprises an extract from a brown seaweed.

### Claim 5 (depends on 1)

The method of claim 1, wherein the alginate suspension additive is a solid additive.

### Claim 6 (depends on 1)

The method of claim 1, wherein the cement slurry further comprises a setting accelerator, a setting retardant, a gelling agent, a fluid loss control agent, an extender, a defoamer, a weighting agent, a dispersant, a thixotropic agent, a bridging agent or lost circulation material, a silicate material, a clay stabilizer, or a combination comprising at least one of the foregoing.

### Claim 7 (depends on 1)

The method of claim 1, wherein the cement slurry has a density of about 10 to about 20 pounds per gallon.

### Claim 8 (depends on 1)

The method claim 1, wherein the wellbore has a temperature of less than 200° F.

### Claim 9 (depends on 1)

The method of claim 1, wherein the cementitious component is present in an amount of about 65 to about 85 wt. %, based on the total weight of the cement slurry.

### Claim 10 (depends on 1)

The method of claim 1, wherein the aqueous carrier is present in the cement slurries in an amount of about 20% to about 40% by weight, based on the total weight of the cement slurry.

### Claim 11

A cement composition comprising:
a cementitious component;
an aqueous carrier;
an alginate suspension additive; and
a cement additive comprising a setting accelerator, a setting retardant, a gelling agent, a fluid loss control agent, an extender, a defoamer, a weighting agent, a dispersant, a thixotropic agent, a bridging agent or lost circulation material, a silicate material, a clay stabilizer, or a combination comprising at least one of the foregoing,
wherein the alginate suspension additive is present in an amount of about 0.01 wt. % to about 5 wt. % based on the weight of the aqueous carrier.

### Claim 12 (depends on 11)

The cement composition of claim 11, wherein the alginate suspension additive is added in an amount of about 0.05 wt. % to about 2 wt. % based on the weight of the aqueous carrier.

### Claim 13 (depends on 11)

The cement composition of claim 11, wherein the alginate suspension additive comprises an alginate, alginic acid, sodium alginate, potassium alginate, ammonium alginate, calcium alginate, zinc alginate, or a combination comprising at least one of the foregoing.

### Claim 14 (depends on 11)

The cement composition of claim 11, wherein the alginate suspension additive comprises an extract from a brown seaweed.