Polymer-based latex for cementing fluids

A cementing fluid composition comprising:

• a latex comprising a first polymer and a second polymer dispersed in water, wherein:
• the first polymer comprises at least about 80 mol % polyvinyl acetate;
• and
• the second polymer is derived from styrene and butadiene, and has the general structure:
• wherein:
• a sum of x, y, and z is equal to s,
• x is about 20% to about 30% of s,
• y is about 70% to about 80% of s, and
• z is 0.1% to about 2% of s;
• and
• a cement, wherein a concentration of the cement in the cementing fluid composition is about 50 wt % to about 80 wt %, and a concentration of the latex in the cementing fluid composition is about 1 wt % to about 15 wt %;
• and
• wherein a hydrophilic portion of the first polymer and the second polymer are attracted to the water and a hydrophobic portion of the second polymer forms a film barrier, and the first polymer and the second polymer interact with cement hydration products to form a semi-permeable membrane.