Large Inner-Diameter (LID) ring-bit systems are used with sacrificed casings when there is a requirement to continue the hole after the casing is set.
Such casings are left in the ground for economical reasons, corrosion protection, sealing, or dealing with ground cavities.
- Piling with sacrificed casings and rock sockets
- Geothermal and water wells
- Surface casings (sealing, dewatering)