Casing Alignment Tool
At times, you will need to mill out collapsed casing and repair the casing using a casing alignment tool. You can also use a string mill and casing alignment tool to repair split casing.

Bottom Hole Assembly

The bottom hole assembly should contain, from bottom to top (connecting to drill collars):

- lace /kick joint
- drill collar for added weight and stability
- full-gauge string mill dressed to drilling bit size.

See the diagram below.

Creating a Lace (Kick)
https://www.drillingmanual.com/casing-alignment-tool/