Casing-patch tool:

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.

Terms Related to Casing-patch tool

• Swage

  A tool used to straighten damaged or collapsed casing in a well.

• Casing roller

  A tool composed of a mandrel on which are mounted several heavy-duty rollers with eccentric roll surfaces. It is used to restore buckled, collapsed, or ...

• Casing pack

  A means of cementing casing in a well so that the casing may, if necessary, be retrieved with minimum difficulty. A special mud, usually an ...

• Intermediate casing string

  The string of casing set in a well after the surface casing but before production casing is set. Keeps hole from caving and seals off ...

• Casing seal receptacle

  A casing sub containing a seal bore and a left-handed thread, run as a crossover between casing sizes, to provide a tubing anchor.

• Guide shoe

  1. A short, heavy, cylindrical section of steel filled with concrete and rounded at the bottom, which is placed at the end of the casing ...

• Casing overshot

  See casing-patch tool