Composite Bridge PlugsDownhole isolation point; drills out fast and clean.
Cast Iron Bridge PlugsStronger downhole isolation using full-circle slips and an elastomer seal element in a cast iron body; drillable, wide casing size range, also suited to permanent zone isolation and well abandonment with cementing.
Dissolvable Bridge PlugsMagnesium/aluminum-alloy plug that self-dissolves in wellbore fluid (formation water or brine); no mechanical drill-out needed, used for staged isolation in multi-stage fracturing of horizontal wells.
Retrievable Mechanical-Set PackersSettable seal, activated by rotation/weight/slack-off, retrieved rather than milled out.