| abstract |
Hydraulic cement fluid loss additive comprising a polyvinyl alcohol resin and a fluid loss enhancing sulfonic acid functionalized coin resin, wherein the polyvinyl alcohol has a characteristic viscosity ranging from 1 cps to 25 cps. The invention includes, in some embodiments, an aqueous concentrate of the PVOH resin and the sulfonic acid functionalized co-resin, wherein the total resin content is in the range of 10% to 40% and the viscosity is less than 15,000 cps. By means of the invention, it is possible to adjust the properties of a hydraulic cement slurry in real time as needed and to reduce the inventory by providing a concentrated aqueous fluid loss additive. |