MWD (measurement while drilling) records the parameters a drill rig produces while it works and derives information about the rock mass from them; it is used in mining and tunnelling to reduce geological uncertainty.
Scope
- Geological modelling: rock hardness, fracturing and water zones identified from MWD data
- Input to support design: early assessment of the need for rock bolts, shotcrete or steel mesh
- Optimisation of drilling parameters and monitoring of advance rate
- More accurate separation of ore and host rock
- Blast optimisation: charge and hole layout adapted to rock conditions
- Safety: early detection of water inflow, voids or weak zones
What is recorded?
The recorded parameters depend on the rig model and the MWD system used. Typically they include penetration rate, rotation pressure, feed pressure, percussion pressure, flushing water or air pressure and flow, and hole depth.
Limitations
MWD data is a machine response, not a direct geological measurement. It should be interpreted together with core drilling, surface mapping and site observation, taking bit wear and drilling settings into account.
Expertise
Our founder Rıza Sağlam is an explosives engineer holding the Epiroc Underground Manager MWD certificate.
Frequently asked questions
What is MWD?
MWD (Measurement While Drilling) is the recording and evaluation of parameters produced by the drill rig while drilling. The data provides indirect but continuous information about the rock mass.
Where is MWD used?
MWD is used in mining and tunnelling projects to understand rock conditions and to adapt support and blast design to them.
Does MWD data replace drill core?
No. MWD data is a machine response; it gives the most reliable result when interpreted together with core, surface mapping and site observation.
Does MWD require special equipment?
MWD requires the drill rig to be equipped with a system that can record data. The recorded parameters depend on the rig model and the MWD system used.