Polymer dispersant for well cementing

A method for cementing a wellbore, the method comprising:

• dispensing a cement composition into an annulus defined between a tubular string and an inner wall of a wellbore or between two tubular strings, where the cement composition comprises:
• from 10 weight percent to 70 weight percent cement precursor based on the total weight of the cement composition;
• from 5 weight percent to 70 weight percent water based on the total weight of the cement composition;
• and
• from 0.001 percent by weight of cement (BWOC) to 1.0 percent BWOC cement dispersant, where the cement dispersant comprises a polynaphthalene sulfonate salt having a weight average molecular weight of from 2500 g/mol to 3000 g/mol and wherein the cement dispersant comprises from 92 weight percent to 95 weight percent polynaphthalene sulfonate based on the total weight of the cement dispersant;
• and
• allowing the cement composition to cure in the annulus to form a cured cement, where the cement dispersant increases the rheological properties.