Microbial metabolism of chlorine oxyanions as a control of biogenic hydrogen sulfide production

Patent metadata

Field	Value
Publication number	US-9994758-B2
Application number	US-201615160680-A
Country	US
Kind code	B2
Filing date	May 20, 2016
Priority date	Jun 3, 2011
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

Abstract

The present disclosure relates to methods of controlling the sulfide (S 2− ) content in systems, such as oil and gas reservoirs and pipelines, by the use of chlorine oxyanions and microorganisms with (per)chlorate-reducing activity.

First claim

I claim:

1. A method of decreasing one or more sulfide-containing compounds in an oil reservoir, the method comprising:
injecting perchlorate to an oil reservoir comprising sulfate-reducing bacteria,
wherein the concentration of injected perchlorate is sufficient to decrease sulfate-reducing activity of said sulfate-reducing bacteria, thereby decreasing one or more sulfide-containing compounds in said oil reservoir.

2. The method of claim 1 , wherein the oil reservoir comprises sulfate, and wherein the perchlorate is at a concentration that is at least 50% of the concentration of sulfate present in the oil reservoir.

3. The method of claim 1 , wherein the oil reservoir comprises sulfate, and wherein the perchlorate is at a concentration that is between 50% and 100% of the concentration of sulfate present in the oil reservoir.

4. The method of claim 1 , wherein the method further comprises injecting nitrite.

5. The method of claim 4 , wherein the nitrite is injected at a concentration sufficient to inhibit the sulfate-reducing bacteria.

6. The method of claim 4 , wherein the nitrite is added in an amount sufficient to yield a perchlorate to nitrite ratio of 100:1.

7. The method of claim 1 , wherein the method further comprises injecting sulfate-reducing bacteria with seawater, sediment, or water rich in decaying organic material.

8. The method of claim 1 , wherein said one or more sulfide-containing compounds is hydrogen sulfide (H 2 S).

9. A method of decreasing one or more sulfide-containing compounds in a gas reservoir, the method comprising injecting perchlorate to a gas reservoir comprising sulfate-reducing bacteria, wherein the concentration of perchlorate is sufficient to decrease sulfate-reducing activity of said sulfate-reducing bacteria, thereby decreasing one or more sulfide-containing compounds in said gas reservoir.

10. The method of claim 9 , wherein the gas reservoir comprises sulfate, and wherein the perchlorate is at a concentration that is at least 50% of the concentration of sulfate present in the gas reservoir.

11. The method of claim 9 , wherein the gas reservoir comprises sulfate, and wherein the perchlorate is at a concentration that is between 50% and 100% of the concentration of sulfate present in the gas reservoir.

12. The method of claim 9 , wherein the method further comprises injecting nitrite.

13. The method of claim 12 wherein the nitrite is injected at a concentration sufficient to inhibit the sulfate-reducing bacteria.

14. The method of claim 12 , wherein the nitrite is injected in an amount sufficient to yield a perchlorate to nitrite ratio of 100:1.

15. The method of claim 12 , wherein the method further comprises injecting sulfate-reducing bacteria with seawater, sediment, or water rich in decaying organic material.

16. The method of claim 12 , wherein said one or more sulfide-containing compounds is hydrogen sulfide (H 2 S).

Assignees

• Univ California

Inventors

• Coates John D

Classifications

• C09K2208/20

  Hydrogen sulfide elimination · CPC title

• C12N9/99

  Enzyme inactivation by chemical treatment · CPC title

• C12N1/00

  Microorganisms; Compositions thereof (medicinal preparations containing material from protozoa, bacteria or viruses A61K35/66, from algae A61K36/02, from fungi A61K36/06; preparing medicinal bacterial antigen or antibody compositions, e.g. bacterial vaccines, A61K39/00); Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor · CPC title

• C07K14/195 Primary

  from bacteria · CPC title

• C09K8/532 Primary

  Sulfur · CPC title