Bridge Plugs

A Bridge Plug is a downhole tool (composed primarily of slips, a plug mandrel, and a rubber sealing element) that is used in a subsurface manner, meaning it is applied into the wellbore, where it is run and set in casing to isolate a lower zone while an upper section is tested, cemented, stimulated, produced or injected into either permanently or on a temporary basis within the well bore to stop fluids or gas from reaching an upper zone of the well while it's being worked on or treated.

Bridge plugs are typically manufactured from a number of materials that each have their own applicable benefits and disadvantages. Typically for permanent applications they are made from Cast Iron material.