1. n. [Drilling]

The portion of the wellbore that has had metal casing placed and cemented to protect the openhole from fluids, pressures, wellbore stability problems, or a combination of these.

Antonyms: openhole

See: barefoot,  cement,  packer

2. n. [Well Completions]

A wellbore lined with a string of casing or liner. Although the term can apply to any hole section, it is often used to describe techniques and practices applied after a casing or liner has been set across the reservoir zone, such as cased-hole logging or cased-hole testing.

Antonyms: openhole