Additive for controlling fluid loss from well cement slurries, and corresponding cementing method.

摘要

The invention relates to a combination of additives providing original functions, with the combination enabling fluid loss to be controlled effectively. The combination consists mainly in a polynaphthalenesulfonate and an acrylic terpolymer. Its main advantage lies in its suitability for effectively controlling fluid loss regardless of whether the medium is salted-free, slightly salty, or very salty.