an expandable packer or anchor is disclosed . it features a gripping device integral to or mounted in a sleeve over the mandrel . upon expansion , a sealing element engages an outer tubular and the gripping device , such as wickers on slips , preferably digs into the outer tubular . the expansion is preferably by pressure and can incorporate pressure intensifiers delivered by slick line or wire line . release is accomplished by a release tool , which is delivered on slick line or wire line . it stretches the anchor or packer longitudinally , getting it to retract radially , for release . the release tool can be combined with packers or anchors that have a thin walled feature in the mandrel , to release by pulling the mandrel apart .