Changsha Tianhe Drilling Tools and Machinery Co.,Ltd.
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Concentric overburden drill bit with blocks
| Specification |
1. Face: Flat,Convex,Concave,Drop-center.
2. Carbide Button Shape: Spherical,Semi-ballistic,Ballistic and Two-step
3. Bit Shank: COP/DHD/QL/SD/MACH/BR
| A | B | C | D | E | F |
| Outer Dia. of Casing Tube | Inner Dia. of Casing Tube | Reamed Dia. | Min. Inner Dia. of Casing Shoe | Hammer Type | Drill Pipes |
| mm | mm | mm | mm | mm | |
| 168 | 149-155 | 184 | 140 | TH122 | 76,89 |
| 178 | 159-165 | 194 | 150 | TH122 | 76,89 |
| 193 | 173-180 | 206 | 164 | TH139 | 89,114 |
| 219 | 199-206 | 234 | 182 | TH139,TH180 | 89,114 |
| 244 | 224-231 | 260 | 210 | TH180,TH220 | 114 |
| 273 | 251-257 | 305 | 240 | TH180 | 114,127 |
| 323 | 301-310 | 348 | 284 | TH180,TH220 | 127 |
| 406 | 382-388 | 440 | 364 | TH220,TH275 | 127,140 |
| 457 | 433-439 | 488 | 413 | TH275 | 127,140 |
| 508 | 484-490 | 538 | 464 | TH275 | 140 |
| 558 | 534-540 | 590 | 514 | TH275,TH398 | 140 |
| 610 | 586-592 | 642 | 566 | TH275,TH398 | 140,168 |
| 660 | 636-642 | 694 | 615 | TH398 | 168 |
| 711 | 687-693 | 745 | 665 | TH398 | 168 |
| 762 | 738-744 | 798 | 716 | TH600 | 168 |
| 863 | 839-845 | 900 | 815 | TH600 | 168 |
| General Introduction |
Application Range
It is recommended to drill in rock formation where contains some ovals and fractures.
Design Principles
Make the casing follow easy and the equipment and operation simple
Outstanding Advantages
1.The stable and reliable working performance and the less vibration of drill rig.
2.Flexible to open and close.
Operation Procedure
1.when the drilling starts, the blocks slides down through the grooves on pilot bit,and reams to drive the casing shoes and tubes into the hole.
2.When finished the drilling in overburden rock formations, raise the drilling tools and the blocks will get closed through the grooves , and the drilling tools can be pulled out from the hole.
3. Next construction can be followed.
| Raw Material |
Steel:
first class special alloy steel with high strength, heat resistance and wearable
Carbide
The best tungsten carbides from China are commonly applied.
Tungsten carbide from European is also available.
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Product Pictures |