Changsha Chaojingang machinery manufacturing CO., Ltd
Super Diamond, The more use, the more efficient!
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Odex Drilling / Simultaneous Casing Drilling
| Outer Dia.(A) mm | Outer Dia.(A) mm | Inner Dia.(B) mm | The Max Wall Thickness | Reamed Dia.(C) mm | Inner Dia. of Casing Shoe(D) mm | Inner Dia. Of casing shoe that pilot bit can pass through | Type of Hammer Recommended | Hammer Type(E) | Drill Pipe mm |
| CEC108-CD35-84 | 108 | 96 | 6 | 118 | 86 | 84 | CD35 | DHD3.5 QL30 | 76 |
| CEC114-CD35-90 | 114 | 102 | 6 | 123 | 92 | 90 | CD35 | DHD3.5 QL30 | 76 |
| CEC127-CD45-97 | 127 | 109 | 9 | 138 | 99 | 97 | CD45 | DHD340A QL40 | 76 |
| CEC140-CD45-115 | 140 | 128 | 6 | 152 | 117 | 115 | CD45 | DHD340A QL40 | 76 |
| CEC168-CD55-140 | 168 | 156 | 6 | 185 | 142 | 140 | CD55 | DHD350R QL50 | 76/89 |
| CEC178-CD55-146 | 178 | 158 | 10 | 195 | 148 | 146 | CD55 | DHD350R QL50 | 76/89 |
| CEC183-CD55-150 | 183 | 163 | 10 | 200 | 152 | 150 | CD55 | DHD350R QL50 | 76/89 |
| CEC194-CD65-165 | 194 | 180 | 7 | 209 | 167 | 165 | CD65 | DHD360 QL60 | 89/114 |
| CEC219-CD65-190 | 219 | 205 | 7 | 237 | 192 | 190 | CD65 | DHD360 QL60 | 89/114 |
| CEC245-CD85-208 | 245 | 225 | 10 | 264 | 210 | 208 | CD85 | DHD380 QL80 | 114 |
| CEC273-CD85-240 | 273 | 259 | 7 | 308 | 242 | 240 | CD85 | DHD380 QL80 | 114 |
| CEC325-CN100-280 | 325 | 305 | 10 | 358 | 282 | 280 | CN100 | NUMA100 SD10 | 114 |
Overburden Casing Drilling System DTH Bit is very popular in international water well and ore drilling field.
Features
Hardening treatment of the part's surface
with longer operating life and excellent anti - wear properties.
Structural optimization
Strengthen the structural strength, easy to operate
Superior performance
Stable and reliable performance, high drilling speed
When the bore-hole is complete, the casing is retrieved to be used again.
Pros
Rapid removal of cuttings;
No use of drilling mud;
High penetration rate, especially in resistant rock formation (e.g. basalt);
Easy soil and groundwater sampling during drilling;
Possible to measure yield estimate at selected depth in the formation;
Application Range:
It is suitable for drilling water wells, geothermal wells, short mircopiles, medium mini-type grouting hole of building, dam and harbour project.
1. When drilling starts, the reamer swings out and reams the pilot-hole wide enough for the casing tube to slide down behind the drill bit assembly
2. When the required depth is reached, rotation is reversed carefully, whereupon the reamer swings in, allowing the drill bit assembly to be pulled up through the casing.
3. Casing tubes that are to be left in the drill hole should be sealed at the bottom of the hole by means of cement grout or some other sealing agent.
4. Drilling continues to the desired depth in the bedrock using a conventional drilling.