Casing System (Overburden Drilling System)
Casing drilling, or casing while drilling (CwD) process, is a concept that combining two time-consuming processes, drilling and casing together, performing them at the same time. During the CwD process, powered by DTH hammer, a central piloting bit drives a ring bit to drill a hole wide enough for a casing tube to slide down, drilling and casing processes are therefore performed at the same time.
- Complete types of drilling tools suitable for casing tubes with various diameters;
- Good stability and reliability granted by premium alloy steel material and fine CNC manufacturing process;
- Cost-effectiveness realized by mass production.
Water well drilling, geothermal well drilling, foundation piling, geological prospecting, etc.
Permanent
- When start drilling, the central bit drives the ring set to drill a hole wide enough for casing tube to slide down.
- When arriving the bedrock, reverse rotation of the tools and pull out the central bit from the hole, leaving ring set in the hole.
- Pour concrete and proceed to the next steps
Retrievable
- When start drilling, the central bit drives the ring set to drill a hole wide enough for casing tube to slide down.
- When arriving the bedrock, reverse rotation of the drill string and pull out the central bit from the hole.
- Pull the casing tube out with the ring set while pouring concrete.
| A | B | C | D | E | |
| Outer Dia. Of | Max. Wall | Outer Dia. Of | Inner Dia. Of Ring Bit | Max. Dia. of | Suitable |
| Casing Tube | Thickness | Ring Bit | (mm) | Pilot Bit | hammer |
| (mm) | (mm) | (mm) | (mm) | (inches) | |
| 114 | 8 | 126 | 87 | 85 | 3.5" |
| 127 | 10 | 138 | 95 | 94 | 3.5" |
| 139.7 | 5 | 160 | 116.5 | 115 | 4" |
| 152.4 | 5.5 | 170 | 126 | 124 | 5" |
| 168.3 | 5.5 | 190 | 142 | 140 | 5" |
| 177.8 | 7 | 200 | 153.5 | 152 | 6" |
| 193.7 | 5.5 | 220 | 167 | 165 | 6" |
| 219.1 | 6.5 | 246 | 190.5 | 188 | 6" |
| 273 | 8 | 303 | 240 | 238 | 8" |
| 323.9 | 10 | 350 | 282 | 280 | 10" |
| 406 | 12.7 | 442 | 350 | 345 | 12" |
| 508 | 12.7 | 545 | 450 | 445 | 18" |
| 560 | 12.7 | 595 | 500 | 495 | 18" |
| 610 | 12.7 | 645 | 550 | 545 | 18" |
Our rock drilling equipment can be applied in various industries, doing rock drilling and crushing duties for digging, blasting, etc.
We mainly offer 4 series of rock drilling tools: top hammer drilling tools, down-the-hole (DTH) drilling tools, self-drilling anchor system and drag bits.
