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

Patent metadata

Field	Value
Publication number	US-2022073808-A1
Application number	US-202017012318-A
Country	US
Kind code	A1
Filing date	Sep 4, 2020
Priority date	Sep 4, 2020
Publication date	Mar 10, 2022
Grant date	—

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 of fabricating a multivalent iron bio-inhibitor product comprising coupled zFe 0 —Fe 2+ —Fe 3+ from waste bauxite residue, comprising:
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.

13 . The method of claim 12 , wherein the acid solution comprises perchloric acid (HClO 4 ).

14 . The method of claim 12 , wherein the reducing agent is sodium borohydride (NaBH 4 ).

15 . The method of claim 12 , wherein the elemental composition of the waste bauxite residue comprises about 1 wt % to about 50 wt % iron.

16 . 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.

17 . The method of claim 12 , wherein the multivalent iron bio-inhibitor product comprises coupled zFe 0 —Fe 2+ —Fe 3+ at a combined zFe 0 —Fe 2+ —Fe 3+ concentration of about 5 g/L to about 50 g/L.

18 . The method of claim 12 , wherein the multivalent iron bio-inhibitor product comprises heavy metals at a combined concentration of about 1 g/L to about 5 g/L.

19 . 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.

20 . The method of claim 19 , 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.

21 . The method of claim 19 , wherein the sulfur-reducing bacteria is Desulfovibrio species, Thiobacillus species, or a combination thereof.

22 . The method of claim 19 , 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

• C02F3/345

  for biological oxidation or reduction of sulfur compounds · CPC title

• C02F2103/365

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

• C02F1/705

  Reduction by metals · CPC title

• C09K2208/20

  Hydrogen sulfide elimination · CPC title

• C09K8/532 Primary

  Sulfur · CPC title