Conventional Core Drilling Systems
Core barrels, bits and rods where the whole string is pulled to recover each run. Suited to shallow site investigation and short underground definition holes.
Features
- Tooling cost is substantially lower than a wireline system, which is what makes it viable for short programmes.
- Every core run needs the full string pulled, so cost per metre climbs quickly with depth.
- It suits shallow site investigation, foundation work and short up-holes drilled underground.
- Core barrels are simpler, with fewer components to lose or wear, which suits remote work with limited spares.
- Casing is still needed through overburden, so the telescoping plan is no simpler than in wireline drilling.
Specifications
| Figure | Typical range | Unit | Why it matters |
|---|---|---|---|
| Barrel length | 1,5 / 3,0 | m | Shorter runs are usual because each one costs a full trip. |