Compositions for Plugging and Sealing a Subterranean Formation

摘要

Compositions for treating a subterranean formation comprising a water-swellable agent and a sealing agent are described. Preferably, the water-swellable agent is a dehydrated polymer that forms a three-dimensional gel structure in water wherein the gel structure is a continuous mass both inside and outside the water-swellable agent. The sealing agent comprises a non-acidic ethylenically unsaturated polar monomer; a copolymerisable ethylenically unsaturated ester; and at least one organic gelling agent.