SONIC DRILLING: CASING ADVANCEMENT
The diagram to the below shows typical casing advancement. A casing adapter is used to connect the sub-saver to the casing. Casing is sonically advanced over the core barrel to hole depth.
SONIC DRILLING: CORE BARREL ADVANCEMENT
During typical core barrel advancement, the core barrel is advanced 3 meters using sonic frequencies the core barrel is in place, casing is sonically advanced over the core barrel. The core barrel is retrieved, producing a relatively undisturbed sample.