Multivalent iron bio-inhibitor from waste bauxite residue to control reservoir souring

Patent metadata

Field	Value
Publication number	US-11535790-B2
Application number	US-202017012318-A
Country	US
Kind code	B2
Filing date	Sep 4, 2020
Priority date	Sep 4, 2020
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

This disclosure relates to a method of fabricating a multivalent iron bio-inhibitor from waste bauxite residue and methods of controlling reservoir souring using the multivalent iron bio-inhibitor.

First claim

What is claimed is:

1. A method for treating or preventing reservoir souring, comprising:
providing a multivalent iron bio-inhibitor product comprising coupled zFe 0 —Fe 2+ —Fe 3+ to a reservoir; and
inhibiting or terminating the growth, activity, or both, of sulfur-reducing bacteria present in the reservoir.

2. The method of claim 1 , wherein the multivalent iron bio-inhibitor product comprises coupled zFe 0 —Fe 2+ —Fe 3+ at a concentration ratio of about 4:3:1 to about 3.5:2.5:1.

3. The method of claim 1 , wherein the multivalent iron bio-inhibitor product is provided to the reservoir at a combined zFe 0 —Fe 2+ —Fe 3+ concentration of about 0.1 g/L to about 20 g/L.

4. The method of claim 1 , wherein the multivalent iron bio-inhibitor product is provided to the reservoir at a combined zFe 0 —Fe 2+ —Fe 3+ concentration of about 4 g/L to about 12 g/L.

5. The method of claim 1 , wherein the multivalent iron bio-inhibitor product comprises heavy metals at a combined concentration of about 0.01 g/L to about 3 g/L.

6. The method of claim 1 , wherein the multivalent iron bio-inhibitor product is fabricated from waste bauxite residue.

7. The method of claim 1 , wherein the sulfur-reducing bacteria is Desulfovibrio species, Thiobacillus species, or a combination thereof.

8. The method of claim 1 , wherein the method inhibits the formation of hydrogen sulfide (H 2 S) in the reservoir.

9. The method of claim 1 , wherein the method removes H 2 S present in the reservoir.

10. The method of claim 1 , wherein the reservoir is an oilfield reservoir, a reservoir in a wastewater treatment facility, or a reservoir in a hydrothermal system.

11. The method of claim 1 , further comprising fabricating the multivalent iron bio-inhibitor product from waste bauxite residue, wherein the fabricating comprises:
treating the waste bauxite residue with an acid solution to form a first mixture;
treating the first mixture with a reducing agent to form a second mixture comprising coupled zFe 0 —Fe 2+ —Fe 3+ ; and
obtaining the multivalent iron bio-inhibitor product comprising coupled zFe 0 —Fe 2+ —Fe 3+ from the second mixture.

12. A method for inhibiting or terminating the growth or activity of sulfur-reducing bacteria in a reservoir, comprising providing a multivalent iron bio-inhibitor product comprising coupled zFe 0 —Fe 2+ —Fe 3+ to a reservoir, wherein the multivalent iron bio-inhibitor product is fabricated from waste bauxite residue.

13. The method of claim 12 , wherein the method inhibits the formation of H 2 S in the reservoir, removes H 2 S present in the reservoir, or a combination thereof.

14. The method of claim 12 , wherein the sulfur-reducing bacteria is Desulfovibrio species, Thiobacillus species, or a combination thereof.

15. The method of claim 12 , wherein the multivalent iron bio-inhibitor product comprises coupled zFe 0 —Fe 2+ —Fe 3+ at a concentration ratio of about 4:3:1.

Assignees

• Saudi Arabian Oil Co

Inventors

• Oduro Harry Daniel

Classifications

• C02F1/705

  Reduction by metals · CPC title

• C09K8/532 Primary

  Sulfur · CPC title

• C09K2208/20

  Hydrogen sulfide elimination · CPC title

• C02F2103/365

  from petrochemical industry (e.g. refineries) · CPC title

• C02F2209/26

  H2S · CPC title