Patent ID: 8657008

Claim:
A process for disrupting filter cake in an underground formation, which process comprises: (i) dispersing in a treatment fluid particles consisting of a solid polymer capable of being converted by hydrolysis into one or more organic acids and incorporating into the treatment fluid one or more soluble polymer breakers, wherein said one or more soluble polymer breakers are selected from the group consisting of polysaccharide hydrolyzing enzymes, persulphates, perborates, percarbonates, perphosphates, hypochlorites and persilicates; then (ii) introducing the treatment fluid into said underground formation containing said filter cake; and (iii) allowing the solid polymer to hydrolyze in the presence of water to produce organic acid such that acid soluble material within the filter cake or adjacent formation is dissolved, and allowing the one or more soluble polymer breakers to degrade polymeric material that is present within the filter cake.