Concentric Casing System

Concentric casing system is designed to drill and case a hole simultaneously through unstable ground conditions. The driver bit incorporated with a satisficial ring or reusable ring makes a full face head design which significantly improves the penetration rate and hole straightness of drilling. The internal flushing grooves together with the built-in casing shoes gives a good seal to the button of the drilling hole, and thus minimizing the disruption of the surrounding of the drill hole....

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There are two types Concentric casing system, one is Permanent type, the other is Retrievable type.

 

Operation Procedure kindly check below: 

Permanent

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1. When drilling starts, the pilot bit drive the ring bit down to the hole, followed the casing shoe and casing tube.

2. At the bedrock, start Reverse circulation of tools and pull the pilot bit from the drill hole leaving the ring bit in the hole.

3. Pour the concrete or do the next constructions work.

 

Retrievable

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1.After the drilling starts, the pilot bit drive the ring bit down to the

hole, followed the casing shoe and casing tube.

2. At the bedrock, start Reverse circulation of tools and pull the pilot

bit back from the drill hole leaving the ring bit in the drill hole.

3. Pull the casing tube out with the ring bit and at the same time pour the concrete.

 

Concentric Overburden Casing Drilling System

Model Outer Dia. of Casing Tube Inner Dia. of Casing Tube Wall thickness of casing Ring Bit Outer Dia Ring Bit Inner Dia Max Outer Dia of Normal Bits Hammer Type
(mm) (mm) (mm) (mm) (mm) (mm)
For DTH Drilling
R114/6.5-80 114 101 6.5 122 80 78 COP32/COP34/DHD3.5/BR3/MACH303
R127/10-93 127 107 10 136 93 91
R133/10-96 133 113 10 141 96 94 COP44/DHD340/MACH44/MISSION40/   SD4/XL4/QL40
R139/10-102 139 119 10 147 102 100
R152/10-114 152 132 10 160 114 112
R168/10-130 168 10 148 177 130 128 COP54/DHD350/MACH50/MISSION50/   SD5/QL50
R177/10-139 177 10 157 187 139 137
R193/12.7-152 193 167.6 12.7 203 152 150 COP62/COP64/DHD360/MISSION60/SD6/  XL6/QL60/
R219/12.7-175 219 193.6 12.7 232 175 173
R244/12.7-198 244 218.6 12.7 254 198 196 COP84/DHD380/SD8/QL80
R254/12.7-205 254 228.6 12.7 266 205 203
RP273/12.7-224 273 247.6 12.7 285 224 222
R323/12.7-271 323 297.6 12.7 338 271 269
R406/12.7-350 406 380.6 12.7 420 350 348 DHD112/QL120/SD12/NUMA120
R457/12.7-376 457 431.6 12.7 477 376 374
R508/16-444 508 476 16 524 444 442
R558/16-491 558 526 16 575 491 489 QL200/SD18/NUMA180
R609/16-553 609 577 16 637 553 551
R660/16-590 660 628 16 678 590 588
R711/16-639 711 679 16 731 639 637 QL200S
R762/16-690 762 730 16 781 690 688
R812/16-734 812 780 16 834 734 732
R863/16-788 863 831 16 882 788 786
R914/16-835 914 882 16 935 835 833
R1016/16-911 1016 984 16 1033 911 909 QL300

 

Packing

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Key Words: 

Concentric Casing Drilling System,

Concentric Overburden Casing Drilling System

Symmetric Casing Drilling System,

Symmetric Overburden Casing Drilling System

Symmetric / Concentric Overburden Casing Drilling System

Concentric Casing System with Blocks

Retrievable Concentric Symmetrix Casing System

Concentric system Symmetrix Overburden Casing System With Wings

Recirculation Concentric Overburden Casing System

Geothermal well eccentric overburden casing drilling


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