Methods useful for controlling fluid loss in subterranean formations

A method of reducing fluid loss from a perforated interval of a well bore comprising:

• providing a treatment fluid comprising an aqueous fluid and a fluid loss control additive comprising a water-soluble polymer having hydrophobic or hydrophilic modification;
• introducing the treatment fluid into the perforated interval of the well bore so that the treatment fluid contacts a portion of a subterranean formation through one or more openings that extend from the perforated interval of the well bore into the subterranean formation.

A method of reducing fluid loss from a gravel packed interval of a well bore comprising:

• providing a treatment fluid comprising an aqueous fluid and a fluid loss control additive comprising a water-soluble polymer having hydrophobic or hydrophilic modification;
• introducing the treatment fluid into the gravel packed interval of the well bore, wherein a gravel pack is disposed in the gravel packed interval of the well bore, and wherein the treatment fluid contacts the gravel pack.