Henan Rancheng Machinery Co., Ltd.
| Payment Terms | T/T, Western Union |
| Supply Ability | 100sets per Month |
| Delivery Time | 10-15 working days |
| Packaging Details | Standard shipping |
| Name | Drilling Rig Tools |
| Model | Concentric Bit |
| Outer Dia. of Casing Tube | 108-508mm |
| Reamed Dia. | 118-538mm |
| Brand Name | RanCheng |
| Model Number | Concentric Bit |
| Certification | CE, ISO 9001:2000 |
| Place of Origin | China |
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Product Specification
| Payment Terms | T/T, Western Union | Supply Ability | 100sets per Month |
| Delivery Time | 10-15 working days | Packaging Details | Standard shipping |
| Name | Drilling Rig Tools | Model | Concentric Bit |
| Outer Dia. of Casing Tube | 108-508mm | Reamed Dia. | 118-538mm |
| Brand Name | RanCheng | Model Number | Concentric Bit |
| Certification | CE, ISO 9001:2000 | Place of Origin | China |
| High Light | DTH Drilling Rig Tools ，508mm Drilling Rig Tools ，Water Drilling Concentric Bits | ||
Concentric Bit for DTH Water Drilling Projects Drilling Rig Tools
Product Description
The concentric / symmetrical drilling system is an efficient integrated drilling and casing technology, especially suitable for environments with unstable formations. This system uses a removable or reusable ring drill bit to speed up the drilling process and maintain the straightness of the borehole. Its internal flush tank and casing shoe design provide excellent sealing while reducing formation disturbance.
This system is widely used in the construction of water wells, geothermal wells, building foundations, dams and ports, etc. It is mainly used for drilling short holes and small and medium - sized grouting holes.
Technical Parameters
| Outer Dia. of Casing Tube | Inner Dia. of Casing Tube | Reamed Dia. | Min. Inner Dia. of Casing Shoe | Drill Pipes | Max. Outer Dia. of Normal Bit |
| mm | mm | mm | mm | mm | mm |
| 108 | 93-99 | 118 | 86 | 76 | 77 |
| 114 | 101-103 | 127 | 91 | 76 | 82 |
| 127 | 114-116 | 136 | 101 | 76 | 92 |
| 140 | 124-127 | 152 | 117 | 76 | 105 |
| 146 | 127-132 | 154 | 117 | 76 | 105 |
| 168 | 149-155 | 184 | 140 | 76,89 | 125 |
| 178 | 159-165 | 194 | 150 | 76,89 | 140 |
| 193 | 173-180 | 206 | 164 | 89,114 | 150 |
| 219 | 199-206 | 234 | 184 | 89,114 | 165 |
| 244 | 224-231 | 260 | 210 | 114 | 190 |
| 273 | 251-257 | 305 | 240 | 114,127 | 220 |
| 323 | 301-310 | 348 | 284 | 127 | 255 |
| 406 | 382-388 | 440 | 364 | 140 | 340 |
| 457 | 433-439 | 488 | 413 | 140 | 385 |
| 508 | 484-490 | 538 | 464 | 140 | 440 |
Operation Process
1 . Weld the trephine bit and casing shoe to the casing and lock it firmly on the pilot bit by tapping.
2 . The impact energy is transmitted through the pilot bit and the trephine bit, effectively breaking the rock and advancing the casing.
3 . After drilling and casing operations are completed, remove the drill string with the pilot bit by gentle counter-rotation and unlock the latch connection. The trephine bit remains in the hole and is only removed when retrieving the casing.
4 . Finally, continue drilling into the bedrock to the predetermined depth using traditional drilling techniques.
The advantages of this drilling system are its integrated design and efficient operating procedures, making it ideal for drilling in unstable formation conditions.
Machine Pictures
Company Details
Business Type:
Manufacturer,Exporter,Seller
Year Established:
2010
Total Annual:
20 Million-30 Million
Employee Number:
100~200
Ecer Certification：
Verified Supplier
Henan Rancheng Machinery Co., Ltd., located in the historically renowned city of Zhengzhou, Henan Province, China, has been dedicated to the design and manufacturing of drilling rigs, mud pumps, air compressors, and drilling tools since its establishment in 2010. With deep industry experience and co... Henan Rancheng Machinery Co., Ltd., located in the historically renowned city of Zhengzhou, Henan Province, China, has been dedicated to the design and manufacturing of drilling rigs, mud pumps, air compressors, and drilling tools since its establishment in 2010. With deep industry experience and co...
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