Definition(s)
Casing Packer
A downhole tool (composed primarily of slips, an open mandrel, and a rubber sealing element) that is installed in wells to seal the tubing-casing annulus and protect the casing from fluids produced through or pumped down the tubing and to isolate the casing from pressure(s).
Source: API BULLETIN E3, Environmental Guidance Document: Well Abandonment and Inactive Well Practices for U.S. Exploration and Production Operations, First Edition, January 1993 (Reaffirmed June 2000). Global Standards