Compositions and methods for branched calcium lignosulfonate cement dispersants
Compositions may include a calcium lignosulfonate salt having syringyl groups of 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, an alcohol, an aldehyde, and water, wherein a total number of syringyl groups 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.
1 . A composition comprising:
an alcohol, an aldehyde, water, and a calcium lignosulfonate salt having 2 to 10 syringyl groups and no guaiacyl groups;
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.
2 . The composition of claim 1 , wherein a specific gravity of the composition is about 1 g/cm 3 to about 1.4 g/cm 3 at 25° C.
3 . The composition of claim 1 , wherein the alcohol is methanol and the aldehyde is formaldehyde.
4 . The composition 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 composition.
5 . A cement slurry comprising:
a lignosulfonate-based cement dispersant, a cement, and water;
wherein the lignosulfonate-based cement dispersant comprises an alcohol, an aldehyde, water, and a calcium lignosulfonate salt having 2 to 10 syringyl groups and no guaiacyl groups;
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.
6 . The cement slurry of claim 5 , further comprising a strength-stabilizing agent, an expansion additive, a weighting agent, a defoamer, a gelling agent, a retarder, or any combination thereof.
7 . The cement slurry of claim 6 , 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.
8 . The cement slurry of claim 5 , wherein a density of the cement slurry is about 2 g/cm 3 to about 3 g/cm 3 at 25° C.
9 . The cement slurry of claim 5 , 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.
10 . The cement slurry of claim 5 , wherein the alcohol is methanol and the aldehyde is formaldehyde.
11 . The cement slurry of claim 5 , 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.
12 . The cement slurry of claim 5 , 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.
13 . The cement slurry of claim 5 , wherein the cement is a hydraulic cement.
14 . The cement slurry of claim 5 , wherein the cement is a mixture of limestone, clay, and gypsum.
15 . The cement slurry of claim 5 , wherein the cement is a Class G Portland cement.
16 . The cement slurry of claim 5 , wherein the cement is a non-hydraulic cement.
17 . The cement slurry of claim 5 , wherein the cement is a mixture of lime, gypsum, plasters, and oxychloride.