The present invention provides a single trip system for placing perforating apparatus and sand control equipment in a wellbore. This system includes a casing string equipped with extendible pistons and a pumpable activator plug for extending the pistons. Additionally, this system utilizes a single gravel-pack...http://www.google.com.au/patents/US5505260?utm_source=gb-gplus-sharePatent US5505260 - Method and apparatus for wellbore sand control
