Casing-patch tool Definition


Casing-patch tool:

A special tool with a rubber packer or lead seal that is used to repair casing.

When casing is damaged downhole, a cut is made below the damaged casing, the damaged casing and the casing above it are pulled from the well, and the damaged casing is removed from the casing string.

The tool is made up and lowered into the well on the casing until it engages the top of the casing that remains in the well, and a rubber packer or lead seal in the tool forms a seal with the casing that is in the well.

The casing-patch tool is an over-shot-like device and is sometimes called a casing overshot.