Compositions and methods for branched calcium lignosulfonate cement dispersants

Patent metadata

Field	Value
Publication number	US-12291670-B2
Application number	US-202318166343-A
Country	US
Kind code	B2
Filing date	Feb 8, 2023
Priority date	Feb 8, 2023
Publication date	May 6, 2025
Grant date	May 6, 2025

Abstract

Compositions may include a calcium lignosulfonate salt having a chemical structure (I), wherein a total number of syringyl groups is 2 to 10. The compositions may further include an alcohol, an aldehyde, and water. Cement slurries may include a lignosulfonate-based cement dispersant including a calcium lignosulfonate salt having a chemical structure (I), an alcohol, an aldehyde, and water, wherein a total number of syringyl groups in the chemical structure (I) is 2 to 10. The cement slurries may further include a cement and water. Methods may include introducing a cement slurry into a wellbore penetrating a subterranean formation, wherein the cement slurry comprises a lignosulfonate-based cement dispersant, a cement, and water, and allowing the cement slurry to set to a concrete in a downhole zone of interest.

First claim

The invention claimed is:

1. A method comprising:
introducing a cement slurry into a wellbore penetrating a subterranean formation;
wherein the cement slurry comprises a lignosulfonate-based cement dispersant, a cement, and water;
wherein the lignosulfonate-based cement dispersant comprises a calcium lignosulfonate salt having 2 to 10 syringyl groups and no guaiacyl groups, an alcohol, an aldehyde, and water;
wherein the alcohol is selected from the group consisting of methanol, ethanol, propanol, iso-butanol, t-butanol, and any combination thereof; and
wherein the aldehyde is selected from the group consisting of formaldehyde, acetaldehyde, propanal, butanal, and any combination thereof; and
allowing the cement slurry to set to a concrete in a downhole zone of interest.

2. The method of claim 1 , wherein the cement slurry further comprises a strength-stabilizing agent, an expansion additive, a weighting agent, a defoamer, a gelling agent, a retarder, or any combination thereof.

3. The method of claim 2 , wherein a concentration of the strength-stabilizing agent is about 10 wt % to about 20 wt %, a concentration of the expansion additive is 0.1 wt % to about 1 wt %, a concentration of the weighting agent is about 10 wt % to about 20 wt %, a concentration of the defoamer is about 0.001 wt % to about 0.1 wt %, a concentration of the gelling agent is about 0.01 wt % to about 1 wt %, and a concentration of the retarder is about 0.1 wt % to about 1 wt %, based on the weight of the cement slurry.

4. The method of claim 1 , wherein a density of the cement slurry is about 2 g/cm 3 to about 3 g/cm 3 at 25° C.

5. The method of claim 1 , wherein a specific gravity of the lignosulfonate-based cement dispersant is about 1 g/cm 3 to about 1.4 g/cm 3 at 25° C.

6. The method of claim 1 , wherein the alcohol is methanol and the aldehyde is formaldehyde.

7. The method of claim 1 , wherein a concentration of the calcium lignosulfonate salt is about 10 wt % to about 30 wt %, a concentration of the alcohol is about 0.1 wt % to about 4 wt %, and a concentration of the aldehyde is about 0.1 wt % to about 4 wt %, based on the weight of the lignosulfonate-based cement dispersant.

8. The method of claim 1 , wherein a concentration of the lignosulfonate-based cement dispersant is about 0.1 wt % to about 2 wt %, a concentration of the cement is about 30 wt % to about 60 wt %, and a concentration of the water is about 10 wt % to about 30 wt %, based on the weight of the cement slurry.

Assignees

• Saudi Arabian Oil Co

Inventors

• Alanqari Khawlah A
• Al-Yami Abdullah
• Wagle Vikrant
• Alsafran Ali

Classifications

• C04B2201/20

  for the density · CPC title

• C04B2103/408

  Dispersants · CPC title

• C04B28/04

  Portland cements · CPC title

• C04B24/40

  Compounds containing silicon, titanium or zirconium {or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes} · CPC title

• C04B24/18 Primary

  Lignin sulfonic acid or derivatives thereof, e.g. sulfite lye · CPC title