# US 12,215,277 B2 · Sequestration of carbon dioxide in organic-rich geological formations

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- Number: US 12,215,277 B2
- Document ID: US12215277B2
- Status: Granted
- Kind: B2
- Application number: 18/508,885
- Filed: 2023-11-14
- Published: 2024-03-14
- Granted: 2025-02-04
- Earliest claimed: 2021-12-14
- Assignees: Saudi Arabian Oil Company
- Applicants: Saudi Arabian Oil Company
- Inventors: Katherine Leigh Hull; Hasmukh A. Patel; Younane N. Abousleiman; David Jacobi; Poorna Srinivasan
- Web page: https://patentgrep.com/patent/US12215277B2

## CPC

- C09K 8/594: Compositions used in combination with injected gas {, e.g. CO2 orcarbonated gas}(C09K8/592 takes precedence)
- C09K 8/72: Eroding chemicals, e.g. acids
- E21B 41/0064: {Carbon dioxide sequestration (storing fluids in porous layers B65G5/005)}
- Y02C 20/40: of CO2
- 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
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]

## Abstract

A method for subsurface sequestration of carbon dioxide includes placing into a subterranean zone an oxidizer having a redox potential of at least 0.5 volts. The subterranean zone has an average total organic content of at least three weight percent. Carbon dioxide is injected into the subterranean zone via one or a plurality of wells. A total volume of all fluids injected into the subterranean zone via the one or the plurality of wells includes, on average per well per month, at least sixty-five weight percent carbon dioxide and less than thirty weight percent water.

## Claims

### Claim 1

A method for subsurface sequestration of carbon dioxide, the method comprising:
forming an oxidizer-carbon dioxide mixture by mixing, with carbon dioxide, an oxidizer having a redox potential of at least 0.5 volts;
injecting the oxidizer-carbon dioxide mixture into a subterranean zone having an average total organic content of at least three weight percent via one or a plurality of wells, wherein a total volume of the mixture injected into the subterranean zone via the one or the plurality of wells comprises, on average per well per month, at least sixty-five weight percent carbon dioxide and less than thirty weight percent water; and
sequestering at least a portion of the carbon dioxide in the subterranean zone.

### Claim 2 (depends on 1)

The method of claim 1, wherein the subterranean zone comprises a shale formation.

### Claim 3 (depends on 1)

The method of claim 1, wherein the subterranean zone comprises a depleted hydrocarbon-producing reservoir formation.

### Claim 4 (depends on 1)

The method of claim 1, wherein the subterranean zone comprises a coal seam.

### Claim 5 (depends on 4)

The method of claim 4, wherein the coal seam has an average total organic content of at least sixty percent.

### Claim 6 (depends on 1)

The method of claim 1, wherein the oxidizer comprises at least one of:
an oxychlorine;
an oxybromine;
oxyiodine;
chlorine;
bromine;
iodine;
ozone;
nitrous oxide;
nitric oxide;
nitrogen dioxide;
a persulfate;
a perborate;
a percarbonate; or
a peroxide.

### Claim 7 (depends on 1)

The method of claim 1, wherein the subterranean zone comprises a geological formation having an average formation temperature of less than 100 degrees centigrade, and wherein the oxidizer comprises at least one of chlorine, a hypochlorite, or chlorine dioxide.

### Claim 8 (depends on 1)

The method of claim 1, wherein the subterranean zone comprises a geological formation having an average formation temperature of greater than 100 degrees centigrade, and wherein the oxidizer comprises at least one of bromine, an oxybromine, a chlorate, or a perchlorate.

### Claim 9 (depends on 1)

The method of claim 1, wherein injecting the oxidizer-carbon dioxide mixture into the subterranean zone is a step of a carbon dioxide sequestration operation having a sequestration rate of at least 250,000 metric tons per year per well.

### Claim 10 (depends on 1)

The method of claim 1, wherein a concentration of the oxidizer relative to the amount of carbon dioxide in the mixture is less than 10 weight percent.

### Claim 11

A method for subsurface sequestration of carbon dioxide, the method comprising:
forming, in situ in a subterranean zone, an oxidizer having a redox potential of at least 0.5 volts by injecting a first precursor compound into the subterranean zone and then injecting a second precursor compound into the subterranean zone, the first precursor compound and the second precursor compound reactive to form the oxidizer, the subterranean zone having an average total organic content of at least three weight percent;
injecting carbon dioxide into the subterranean zone via one or a plurality of wells, wherein a total volume of all fluids injected into the subterranean zone via the one or the plurality of wells comprises, on average per well per month, at least sixty-five weight percent carbon dioxide and less than thirty weight percent water; and
sequestering at least a portion of the carbon dioxide in the subterranean zone.

### Claim 12 (depends on 11)

The method of claim 11, wherein the first precursor comprises a chlorite and the second precursor comprises an oxidizing agent.

### Claim 13 (depends on 11)

The method of claim 11, wherein the first precursor comprises a chlorate and the second precursor comprises a reducing agent.

### Claim 14 (depends on 11)

The method of claim 11, wherein the first precursor comprises an acid and the second precursor comprises and acid.

### Claim 15 (depends on 11)

The method of claim 11, wherein the subterranean zone comprises a shale formation.

### Claim 16 (depends on 11)

The method of claim 11, wherein the subterranean zone comprises a depleted hydrocarbon-producing reservoir formation.

### Claim 17 (depends on 11)

The method of claim 11, wherein the subterranean zone comprises a coal seam.

### Claim 18 (depends on 17)

The method of claim 17, wherein the coal seam has an average total organic content of at least sixty percent.

### Claim 19 (depends on 11)

The method of claim 11, wherein the subterranean zone comprises a geological formation having an average formation temperature of less than 100 degrees centigrade.

### Claim 20 (depends on 11)

The method of claim 11, wherein the subterranean zone comprises a geological formation having an average formation temperature of greater than 100 degrees centigrade.

### Claim 21 (depends on 11)

The method of claim 11, wherein a sequestration rate of the sequestering is at least 250,000 metric tons per year per well.