Drilling & Sampling Technologies - Sonic Drilling
Sonic drilling is used for continuous sampling and monitoring well installation in unconsolidated and soft/fractured bedrock.
The primary benefits of this technology are that very rapid drilling rates are possible combined with reduced volumes of waste.
Sonic drilling is also referred to as vibratory drilling and rotosonic drilling.
A sonic rig uses an oscillator or head with eccentric weights driven by hydraulic motors to generate high sinusoidal force in a rotating pipe drill.
The frequency of vibration (generally between 50 and 120 cycles per second) of the drill bit or core barrel can be varied to allow optimum penetration of subsurface materials.
A dual string assembly allows advancement of casing with the inner casing used to collect samples.
Small amounts of air and water can be used to remove the material between the inner and outer casing.
Sonic Drilling: Rocks Drilled Out and Through
Sonic Drilling Vibratory Head
Retrieval of the Core Sample
Track Mounted Sonic Drilling Apparatus
Cored Rock Fragments (Cylinder Dimensions are 1.5"D x 6"L)