US Patent 7033976 Fluid system additive

A new fluid system additive is provided that serves to disperse and maintain fluid system solids in a stabilized condition and also “toughen” the filter cake. Fluid systems containing this additive also tolerate calcium contamination better than existing additives, and in laboratory tests simulating well conditions, the treated fluid systems demonstrate good fluid properties at high temperatures (e.g. 250° F.) in contrast to similar fluid systems treated with conventional, more costly additives.