an apparatus and method for filling a defined space , such as an annulus around a production tubular within a wellbore , includes a compliant porous material . the compliant porous material can be compressed and maintained in a compressed state by incorporation of a deployment modifier , which may be a water - soluble or oil - soluble adhesive or biopolymer , used as an impregnant , a coating , or a casing . the production tubular can be positioned at a desired location and the compliant porous material exposed to a deployment modifier neutralizing agent , which then dissolves or otherwise prevents the deployment modifier from continuing to inhibit deployment . thus , deployment can be delayed to an optimum time by preventing exposure of the deployment modifier to the deployment modifier neutralizing agent . it is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure . it is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims . 37 cfr 1 . 72