Methods and compositions for treating a subterranean formation are provided. The method can include introducing a treatment fluid into the subterranean formation containing an aqueous downhole fluid. The treatment fluid can contain one or more polymers, a particulate additive containing one or more additives, and one or more organic solvents. The polymer is at least partially dissolved in the organic solvent and the particulate additive is at least partially suspended in the organic solvent. The method can also include combining the treatment fluid with the aqueous downhole fluid to produce a polymeric additive composite and a fluid mixture within the subterranean formation. The polymeric additive composite contains the particulate additive at least partially embedded in the polymer to prevent an uncontrolled release of the particulate additive into the fluid mixture.