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.
Features
- 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" |
Get in Touch
Sinodrills is an international market-oriented enterprise specialized in manufacturing and supplying rock drilling tools. Relying on two manufacturing facilities, we supply a wide variety of rock drills, including top-hammer drilling, down the hole drilling, self-drilling anchors, rag bits. In virtue of reliable quality, competitive pricing, professional and valuable service, we now have grown to be a leading drilling equipment manufacturer in China. When it comes to premium quality rock drilling tools, you need to look no further than Sinodrills. Our drilling products are top-of-the-line. Our goal is to offer you the best hole quality, the most meters drilled per hour, and the lowest production cost possible. We have all the rock tools expertise to offer you the best possible drilling performance.
