Patent ID: 8336618
Filing Date: 2012-12-25
Classification: E21B,Y10S,Y10T

Abstract:
1. An apparatus for isolating at least a portion of a wellbore, the apparatus comprising: a tubular comprising at least one opening in a wall of the tubular; a filter sheet disposed around the tubular; and a shroud disposed around the filter sheet, the shroud having one or more apertures and a seal member with holes formed in a wall of the seal member that substantially align with one or more apertures in the shroud such that the seal member does not obstruct any of the one or more apertures in the shroud when the seal member is defining a first configuration and thus permitting fluid flow through the one or more apertures in the shroud and on exposure to a selected reactant adopting a second configuration to restrict fluid flow through the one or more apertures in the shroud, the seal member adapted to return from the second configuration to the first configuration when concentration of the selected reactant falls below a selected threshold.