Acker - Casing Shoes

The casing shoe is generally used in caving overburden where the "spun in" casing cannot be removed without the hole caving. For this problem, the casing shoe is designed without diamonds on the radius. This allows the shoe bit to stay in place at the bottom of the casing and accommodate other tools passing through the shoe without danger of being destroyed by the diamonds in the bit. After operations are completed, the shoe is recoverable.