Polymeric red mud-based killing fluid and uses thereof

Patent metadata

Field	Value
Publication number	US-12122957-B2
Application number	US-202218065408-A
Country	US
Kind code	B2
Filing date	Dec 13, 2022
Priority date	Dec 13, 2022
Publication date	Oct 22, 2024
Grant date	Oct 22, 2024

Abstract

A high-density red mud-based kill fluid composition includes a neutralized red mud slurry, a polymeric material, and an H 2 S capturing agent. A method of neutralizing red mud includes providing a red mud slurry, adding gypsum to the red mud slurry, and providing a neutralized red mud slurry, wherein the neutralized red mud slurry has a pH ranging from 7.5 to 9.0. A method of treating a sour well includes injecting a red mud-based kill fluid including a neutralized red mud slurry, a polymeric material, and an H 2 S capturing agent into the sour well, wherein the sour well comprises H 2 S gas and CO 2 gas, solidifying the red mud-based kill fluid, and treating the H 2 S gas and the CO 2 gas in the sour well.

First claim

What is claimed:

1. A red mud-based kill fluid composition comprising:
a neutralized red mud slurry;
a polymeric material; and
an H 2 S capturing agent,
wherein the red mud-based kill fluid has a density ranging from 11 to 15 pounds per gallon (ppg);
wherein the neutralized red mud slurry comprises a combination of tricalcium aluminate (Ca 3 Al 2 (OH) 2 ), hydrocalumite (Ca 3 Al 2 (OH) 12 CaCO 3 ·5H 2 O), and ettringite (Ca 3 Al 2 (OH) 12 ·3CaSO 4 ·26H 2 O).

2. The composition of claim 1 , wherein the neutralized red mud slurry comprises water.

3. The composition of claim 1 , wherein the polymeric material is a microcrystalline powder.

4. The composition of claim 1 , wherein the polymeric material is corn-based cellulose.

5. The composition of claim 1 , wherein the H 2 S capturing agent is zinc acetate (ZnOAc).

6. The composition of claim 1 , wherein the composition has a specific gravity ranging from 1.2 to 1.8.

7. The composition of claim 1 , wherein the composition has a pH ranging from 7.5 to 9.0.

8. The composition of claim 1 , wherein the composition has a viscosity ranging from 30 to 70 mPa·s.

9. The composition of claim 8 , wherein the viscosity increases with an increase in temperature.

10. A method of treating a sour well comprising;
injecting a red mud-based kill fluid comprising a neutralized red mud slurry, a polymeric material, and an H 2 S capturing agent into the sour well, wherein the sour well comprises H 2 S gas and CO 2 gas,
wherein the red mud-based kill fluid has a density ranging from 11 to 15 pounds per gallon (ppg), and
wherein the neutralized red mud slurry comprises a combination of tricalcium aluminate (Ca 3 Al 2 (OH) 2 ), hydrocalumite (Ca 3 Al 2 (OH) 12 CaCO 3 ·5H 2 O), and ettringite (Ca 3 Al 2 (OH) 12 ·3CaSO 4 ·26H 2 O);

solidifying the red mud-based kill fluid; and
treating the H 2 S gas and the CO 2 gas in the sour well.

11. The method of claim 10 , wherein treating the H 2 S gas and the CO 2 gas comprises converting the H 2 S gas and the CO 2 gas into one or more of metal sulfides, metal carbonates, and metal bicarbonates.

Assignees

• Saudi Arabian Oil Co

Inventors

• Oduro Harry Daniel

Classifications

• C09K2208/20

  Hydrogen sulfide elimination · CPC title

• C04B28/001

  containing unburned clay (polymer binder - clay mixtures used in well cementing C09K8/44) · CPC title

• C09K8/48 Primary

  Density increasing or weighting additives · CPC title

• C09K8/426 Primary

  for plugging · CPC title