Using our geothermal drilling tools and rotary heads enable customers to react swiftly at all times to ever-changing requirements, and at minimum cost. The advantages offered include:
- swift mobilisation
- efficient and time-saving working procedures
- lower costs and increased competitiveness
- safe working and minimal maintenance
Geothermal work mostly involves two types of drilling operation, to position the geothermal probe in the borehole correctly and cost-effectively:
- Hollow stem auger drilling
- Double-head drilling with auger and casing pipe
You can find more information about the drilling procedures in our catalogue.
Fittings and accessories for efficient geothermal drilling:
- Hydraulic rotary drive heads
- Hollow stem augers, drill bits
- Casings and drill-strings
- Flushing heads, preventers
We also offer bespoke designs to meet your requirements.
Geothermal drilling with hollow stem augers
The lead auger is plugged to prevent the ingress of spoil using a footplate or disposable auger cap or auger bung.
The auger is drilled into the ground until the required depth is reached.
The geothermal probe is inserted within the auger stem.
The footplate is disconnected, by pushing on it or gently turning it in the opposite direction. It remains in the ground.
Finally, the geothermal probe is left in place as the hollow stem auger is withdrawn section by section.
Geothermal overburden boring
In overburden drilling, a casing is used as an external support for unstable ground until a layer of solid ground is reached. It is installed whilst the auger string is simultaneously extended to the final depth.
When the required depth is reached, the drill-string is first withdrawn, and then the geothermal probe is inserted through the casing. Finally, the casing is withdrawn section by section.