CEMENT COMPOSITIONS WITH IMPROVED FLUID LOSS CHARACTERISTICS AND METHODS OF CEMENTING IN SUBTERRANEAN FORMATIONS

摘要

The present invention provides cement compositions comprising an improved fluid loss control additive, and methods for cementing in a subterranean formation using such cement compositions. The cement compositions comprise a hydraulic cement, water, and a fluid loss control additive comprising at least two polymers connected by a pH-sensitive crosslink. Optionally, other ingredients may be included in the compositions.