7 1/2'' 190mm Symmetric Overburden Casing Drilling System Casing Drill Bit
7 1/2'' 190mm Symmetric Overburden Casing Drilling System Casing Drill Bit
Product Description
Symmetric is a system comprised of an ingeniously simple concentric method of drilling through overburden with casing. Symmetric can drill straight holes at any angle (including horizontal) and to depths beyond 100 meters. Working together as one efficient drill bit, the components are made up of:
A pilot bit with large internal flushing holes and external flushing grooves.
Symmetrical ring bit (reamer) with internal bayonet coupling
Casing shoe for driving of casing.
The pilot bit is attached to any common DTH hammer shank or top hammer rod thread.The below size of Symmetric systems which are available, and the special design is upon customer’s requirement:
Symmetric 114, Symmetric 127, Symmetric 140, Symmetric 146, Symmetric 168,
Symmetric 178, Symmetric 195, Symmetric 219, Symmetric 243, Symmetric 273.
Specification
| Casing outer dia.(mm) | Casing thickness(mm) | Ring bit dia.(mm) | Max.dia. of normal bit(mm) |
Suitable hammer (inches) |
Retrievable |
| 114 | 10 | 126 | 84 | 3.5 | No |
| 122 | Yes | ||||
| 127 | 10 | 142 | 93 | 3.5 | No |
| 135 | Yes | ||||
| 140 | 10 | 161 | 97 | 4 | No |
| 148 | Yes | ||||
| 146 | 10 | 165 | 110 | 4 | No |
| 154 | Yes | ||||
| 168 | 12 | 188 | 127 | 5 | No |
| 180 | Yes | ||||
| 178 | 12.7 | 196 | 131 | 5 | No |
| 185 | Yes | ||||
| 194 | 12.7 | 214 | 145 | 6 | No |
| 202 | Yes | ||||
| 219 | 12.7 | 243 | 170 | 6 | No |
| 228 | Yes |
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