185mm Overburden Casing Drill Bit for Complex Formations | DHD340 Hammer Compatible | 148-156mm Casing Diameter
Professional 185mm overburden concentric casing drill bit designed for complex geological formations. Compatible with DHD340 hammer systems for optimal drilling performance.
- Surface Hardening Treatment: Enhanced wear resistance and extended operational lifespan
- Structural Optimization: Reinforced construction strength for easy operation and reliability
- Superior Performance: Stable drilling operation with high penetration rates in challenging formations
| Model | Reaming Diameter (mm) | Casing Diameter (mm) | Equipped Hammer |
|---|---|---|---|
| NMK5E108 | 115 | 93-99 | 90 |
| NMK5E127 | 130 | 115-117 | 110 |
| NMK5E146 | 155 | 130-134 | 110/340 |
| NMK5E168 | 185 | 148-156 | 110/340 |
| NMK5E178 | 195 | 158-166 | 150/340 |
| NMK5E183 | 196 | 168-176 | 350/360 |
| NMK5E193 | 206 | 176-182 | 360 |
| NMK5E219 | 236 | 199-207 | 360 |
Custom NMK system sizes available upon request
Casing is large diameter pipe assembled and inserted into drilled boreholes to protect and support the wellstream, similar to spinal bones protecting the spinal cord.
Pneumatic down-the-hole (DTH) hammer uses compressed air as power source for drilling in pebble, gravel, and hard rock strata. Commonly used in building foundations, bridges, mining, and geological exploration.
Overburden soil is unprocessed fill material containing sand, rocks, clay and stones, typically lacking organic material found in topsoil.
In petroleum systems, overburden rock overlies source rock and contributes to thermal maturation through burial depth temperatures.
Maximum lengths and hole diameters depend on geotechnical conditions, with effective range for heavy rig horizontal directional drilling up to 3,000 meters.
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