Polymeric red mud-based killing fluid and uses thereof

Patent metadata

Field	Value
Publication number	US-2024191126-A1
Application number	US-202218065408-A
Country	US
Kind code	A1
Filing date	Dec 13, 2022
Priority date	Dec 13, 2022
Publication date	Jun 13, 2024
Grant date	—

Abstract

A high-density red mud-based kill fluid composition includes a neutralized red mud slurry, a polymeric material, and an H2S 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 H2S capturing agent into the sour well, wherein the sour well comprises H2S gas and CO2 gas, solidifying the red mud-based kill fluid, and treating the H2S gas and the CO2gas in the sour well.

First claim

1 . A high density 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).

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

3 . The composition of claim 1 , wherein the neutralized red mud slurry comprises one or more calcium-containing mineral complexes selected from the group consisting of tricalcium aluminate (Ca 3 Al 2 (OH) 2 ), hydrocalumite (Ca 3 Al 2 (OH) 12 CaCO 3 ·5H 2 O), ettringite (Ca 3 Al 2 (OH) 12 ·3CaSO 4 ·.26H 2 O), and combinations thereof.

4 . The composition of claim 3 , wherein the one or more calcium-containing mineral complexes are a combination of tricalcium aluminate (Ca 3 Al 2 (OH) 2 ), hydrocalumite (Ca 3 Al2(OH) 12 CaCO 3 ·5H 2 O), and ettringite (Ca 3 Al 2 (OH) 12 ·3CaSO 4 ·26H 2 O).

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

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

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

8 . (canceled)

9 . The composition of claim 1 , wherein the composition has a specific gravity ranging from 1.2 to 1.8 [[g/cm 3 ]].

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

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

12 . The composition of claim 11 , wherein the viscosity increases with an increase in temperature.

13 . A method of neutralizing red mud comprising:
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.

14 . The method of claim 13 , wherein the red mud slurry comprises larnite (Ca 2 (SiO 4 )), cancrinite ((NaCa):(AlSiO 4 ) 6 (CO 3 SO 4 ) 2 ·2H 2 O), hematite (Fe 2 O 3 ), goethite (FeO(OH)), calcite (CaCO 3 ), perovskite (CaTiO 3 ), grossite (CaAl 4 O 7 ), quartz (SiO 2 ), and gibbsite (Al(OH) 3 ).

15 . The method of claim 13 , wherein the gypsum is added to the red mud slurry in a mole ratio ranging from 0.2:1 to 0.4:1 gypsum to red mud slurry.

16 . The method of claim 13 , wherein the neutralized red mud slurry comprises one or more 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).

17 . The method of claim 16 , wherein the neutralized red mud slurry comprises 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 ·26H2O).

18 . 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);
solidifying the red mud-based kill fluid; and treating the H 2 S gas and the CO 2 gas in the sour well.

19 . The method of claim 18 , 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

• C09K8/48 Primary

  Density increasing or weighting additives · CPC title

• C04B28/001

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

• C09K8/426 Primary

  for plugging · CPC title