# US 10,479,921 B2 · Cement having cross-linked polymers

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- Number: US 10,479,921 B2
- Document ID: US10479921B2
- Status: Granted
- Kind: B2
- Application number: 16/272,577
- Filed: 2019-02-11
- Published: 2019-06-06
- Granted: 2019-11-19
- Earliest claimed: 2016-09-20
- Assignees: Saudi Arabian Oil Company
- Applicants: Saudi Arabian Oil Company
- Inventors: Elizabeth Q. Contreras
- Web page: https://patentgrep.com/patent/US10479921B2

## CPC

- C09K 8/46: containing inorganic binders, e.g. Portland cement
- C04B 14/465: {Ca-silicate, e.g. wollastonite}
- C04B 24/04: Carboxylic acids; Salts, anhydrides or esters thereof
- C04B 24/121: {Amines, polyamines}
- C04B 24/287: {Polyamides}
- C04B 28/04: Portland cements
- C08F 283/04: on to polycarbonamides, polyesteramides or polyimides {(C08F283/004 takes precedence)}
- C09K 8/467: containing additives for specific purposes
- E21B 43/16: Enhanced recovery methods for obtaining hydrocarbons
- C04B 2103/0062: {Cross-linked polymers}
- 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
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A method of forming a wellbore cement that includes a cross-linked polyamide. The polyamide is formed by reacting a di-functional amine with an aromatic tri-functional carboxylic acid. The wellbore cement composition is created by blending cement and water with the polyamide and then allowed to cure. Increases in compressive strength, Young's Modulus, and Poisson's Ratio of the cement were realized by adding the polyamide to the cement composition.

## Claims

### Claim 1

A method of forming a cement composition for use in a wellbore comprising:
forming a cross linked polyamide by reacting a trifunctional carboxylic acid with a diamine;
combining an amount of cement, water, and the cross linked polyamide to form a mixture; and
curing the mixture to from a cement composition.

### Claim 2 (depends on 1)

The method of claim 1, where the polyamide comprises about 3% by weight of the cement, and where the water comprises about 42% by weight of the cement.

### Claim 3 (depends on 1)

The method of claim 1, where the polyamide comprises a polyaramide having a molecular weight that ranges from about 189 Daltons to about 555 Daltons.

### Claim 4 (depends on 1)

The method of claim 1, where the diamine comprises ethylenediamine.

### Claim 5 (depends on 1)

The method of claim 1, where the step of curing the cement takes place inside of a wellbore.

### Claim 6 (depends on 1)

The method of claim 1, where the step of forming a cross linked polyamide comprises condensation of the trifunctional carboxylic acid with a diamine by interfacial polymerization at room temperature.

### Claim 7 (depends on 1)

The method of claim 1, where the diamine comprises 1,3-diaminobenzene.

### Claim 8 (depends on 1)

The method of claim 1, where the diamine comprises 1,4-diaminobenzene.

### Claim 9 (depends on 1)

The method of claim 1, where the diamine comprises 1,6-diaminohexane.

### Claim 10 (depends on 1)

The method of claim 1, where the diamine comprises 1,4-phenylenediamine.

### Claim 11

A method of forming a cement composition for use in a wellbore comprising:
forming a cross linked polyamide by combining a trifunctional carboxylic acid with 1,6-diaminohexane mixed with sebacoyl chloride
combining an amount of cement, water, and the cross linked polyamide to form a mixture; and
curing the mixture to form a cement composition.