Concentric Overburden Drilling System

Application Range:
The concentric overburden drilling system is widely used to drill in rock formations where ovals and fractures are present.

Design Principles:
The stable and reliable working performance and less vibration of the drill rig.

Different Structures:
Concentric system with ring bits, wing and blocks.

Other search items: concentric casing system

  • Drilling System with Ring Bits
  • Drilling System with Wings
  • Drilling System with Blocks

Concentric Overburden Drilling System with Ring Bits

Permanent
1. When drilling starts, the pilot bit drives the ring bit down to the hole, followed by the casing shoe and casing tube.
2. At the bedrock, start the reverse circulation of tools and pull the pilot bit from the drill hole. Leave the ring bit in the hole.
3. Pour the concrete or do the next construction task.


Retrievable
1. After the drilling starts, the pilot bit drives the ring bit down to the hole, followed by the casing shoe and casing tube.
2. At the bedrock, start the reverse circulation of tools and pull the pilot bit back from the drill hole. Leave 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.


Permanent Retrievable
A E C D G
System No. Outer Dia. Thickness
Range
Ring bit
Outer Dia
Pilot bit Outer Dia Hammer Type Drill Pipe
Range
Ring Bit
Inner Dia.
KC85 108 mm
(4.25")
9-15mm
(0.35")-(0.59")
118mm
(4.65")
86 mm
(3.4")
DHD 3.5 76 mm
(3")
77 mm
(3.03")
KC90 114 mm
(4.5")
11-13 mm
(0.43)"-(0.51")
127 mm
(5")
9 0 mm
(3.6")
DHD 3.5
COP32/34
76 mm
(3")
82 mm
(3.22")
KC102 127 mm
(5")
11-13 mm
( 0 .43")-( 0 .51")
136 mm
(5.35")
102 mm
(3.97")
DHD3.5
COP32/34
76 mm
(3")
92 mm
(3.62")
KC115 140 mm
(5.5")
13 - 16 mm
(0.5")-(0.63")
152 mm
(5.98")
115 mm
(4.6")
DHD340
QL 40 , SD-4
76 mm
(3")
105 mm
(4.14")
KC115A 146mm
(5.75")
14-19mm
(0.55") - (0.75")
154 mm
(6")
115 mm
(4.6")
DHD340 ,
QL 40 , SD-4
76 mm
(3")
105 mm
(4.14")
KC140 168 mm
(6.6")
13-19 mm
(0.51") - (0.75")
184 mm
(7.25")
140 mm
(5.5")
DHD 350
QL 50 , SD-5
76mm
(3")
125 mm
(4.92")
KC152 178 mm
(7")
13- 19 mm
(0.51") - (0.75")
194 mm
(7.65")
150 mm
(5.9")
DHD350
QL50 , SD-5
76, 89 mm
(3"),(3.5")
140 mm
(5.5")
KC165 193 mm
(7.6")
13- 20 mm
(0.51") -(0.78")
206 mm
(8.11")
16 5 mm
(6.45")
DHD 360
QL 60 , SD-6
89, 114 m
(3.5"),(4.5")
150 mm
(5.90")
KC185 219 mm
(8.62")
13-20mm
( 0 .51") - ( 0 .78")
234 mm
(9.2")
184 mm
(7.25")
DHD 360
QL 60 , SD-6
89, 114 mm
(3.5"),(4.5")
165 mm
(6.5")
KC210 244 mm
(9.6")
13 - 20 mm
(0.51") -(0.78")
260 mm (10.25") 210 mm
(8.25")
DHD360/80
SD-6/8 , QL 60/80
114 mm
(4.5")
190 mm
(7.5")
KC240 273 mm
(10.75")
16- 22 Mm
(0.63") -(0.83")
305 mm
(12")
240 mm
(9.45")
DHD380,
QL 80 , SD-8
114, 127mm
(4.5"),(5")
220 mm (8.7")
KC280 323 mm
(12.7")
13- 22 mm
( 0 .51") -( 0 .86")
348 mm
(13.7")
284 mm
(11.2")
DHD 380 ,
QL 80 , SD 8/10
127 mm
(5")
255 mm
(10")
KC365 406 mm
(16")
18 -24 mm
(0.70") -(0.94")
440 mm (17.32") 364 mm
(14.33")
DHD112
QL 120 , SD - 10/12
140 mm
(5.5")
340 mm
(13.4")
KC410 457 mm
(18")
18 - 24 mm
(0.70") - (0.94")
488 mm
(19.2")
413 mm
(16.25")
DHD 112
QL 120 , SD-12
140 mm
(5.5")
385 mm
(15")
KC465 508 mm
(20")
18-24mm
( 0 .70")- ( 0 .94")
538 mm
(21.2")
464 mm
(18.25")
DHD 112
QL 120/200 , SD-15/18
140 mm
(5.5")
440 mm (17.3")
KC510 558 mm
(22")
18 - 24 mm
(0.70")-(0.94")
590 mm
(23.22")
514 mm
(20.25")
DHD 112S , QL 120/200
SD-15/18 , NUMA 180
140 mm
(5.5")
485 mm
(19")
KC560 610 mm
(24")
18 - 24 mm (0.70")-(0.94") 642mm
(25.25")
566 mm
(22.25")
QL 200
NUMA180 , SD-18
168 mm (6.6") 540mm
(21.25")
KC615 660 mm
(26")
18 - 24 mm
(0.70")-(0.94")
694 mm
(27.3")
615 mm
(24.2")
QL200/SD-18
NUMA180
168mm
(6.6")
590 mm
(23.2")
KC660 711 mm
(28")
18 - 24 mm
(0.70")-(0.94")
745 mm
(29.3")
665 mm
(26.2")
QL 200 , SD-18
NUMA 180/240
168mm
(6.6")
640 mm
(25.2")
KC715 762 mm
(30")
18 - 24 mm (0.70")-(0.94") 798 mm
(31.4")
716 mm
(28.2")
QL 200-SD18
N180/240
168mm
(6.6")
685 mm
(26.95")
KC815 863 mm
(34")
18 - 24 mm
(0.70")-(0.94")
900 mm
(35.4")
815 mm
(32")
QL 200
NUMA 180/240
168mm
(6.6")
785 mm
(30.9")

Concentric Overburden Drilling System with Wings

Operation Procedure
1. The wings swing out soon after the drilling starts. The ream drives the casing shoes and tubes in the drill hole.
2. After completing the drilling process in the overburden rock formation, the wings will close as soon as the reverse drilling process begins. This allows the drilling tool to be pulled back from the hole.
3. Follow the next drilling process.


A E C D E
System No. Outer Dia. Thickness
Range
Wing Bit
Outer Dia.
Guide device
Dia.
Hammer Type Drill Pipes
KCC125 114 mm
(4.5")
11-13mm
( 0 .43") - ( 0 .51")
125 mm
(4.92")
93 mm
(3.66")
DHD 350
COP 32/34
60 mm
(2.36")
KCC152 140 mm
(5.5")
13-16mm
( 0 .51") - ( 0 .63")
152 mm
(6")
113 mm
(4.45")
DHD 340
QL 40, SD-4
76 mm
(3")
KCC150 146 mm
(5.75")
14-19 mm
( 0 .55") - ( 0 .75")
154 mm
(6.06")
115 mm
(4.52")
DHD 340
QL 40, SD-4
76 mm
(3")
KCC185 168 mm
(6.6")
13-19 mm
(.51") - ( 0 .75")
184 mm
(7.25")
138 mm
(5.43")
DHD 350
QL 50, SD-5
76, 89 mm
(3"), (3.5")
KCC190 178 mm
(7")
13-19 mm
( 0 .51") - ( 0 .75")
194 mm
(7.6")
148 mm
(5.8")
DHD350/360
QL50/60, SD5/6
76, 89 mm
(3"), (3.5")
KCC205 193 mm
(7.6")
13-20 mm
( 0 .51") - ( 0 .78")
206 mm
(8.11")
164 mm
(6.45")
DHD360
QL 60 /SD-6
114 mm
(4.5")
KCC230 219 mm
(8.62")
13-20 mm
( 0 .51") - ( 0 .78")
234 mm
(9.2")
185 mm
(7.28")
DHD360
QL 60, SD-6
114 mm
(4.5")
KCC275 244 mm
(9.6")
13-20 mm
( 0 .51") - ( 0 .78")
273 mm
(10.75")
219 mm
(8.62")
DHD380
QL-80, SD-8
114 mm
(4.5")

Concentric Overburden Drilling System with Blocks


Operation Procedure
1. As drilling begins, the blocks slide down through the grooves on the pilot bit, and the ream drives the casing shoes and tubes into the drill hole.
2. After the drilling process is complete in overburden rock formations, raise the drilling tools, allowing the blocks to close through the grooves. Once this is done, the drilling tools can be pulled out from the drill hole.
3. Next construction tasks can be carried out.

A E C D DTH Hammer
System No. OuterDia. Thickness
Range
Pilot bit with Block
Outer Dia.
Pilot Bit
Outer Dia.
Hammer Type Drill Pipes
KB140 168 mm
(6.6")
13-19 mm
( 0 .51") - ( 0 .75")
184 mm
(7.25")
140 mm
(5.5")
DHD 350
QL 50 / SD-5
76, 89 mm
(3"), (3.5")
KB150 178 mm
(7")
13-19 mm
( 0 .51") - ( 0 .75")
194 mm
(7.64")
150 mm
(5.90")
DHD 350/360
QL50/60 , SD5/6
76, 89 mm
(3"), (3.5")
KB165 193 mm
(7.6")
13-20 mm
( 0 .51") - ( 0 .78")
206 mm
(8.11")
164 mm
(6.45")
DHD 360
QL 60 , SD-6
89, 114 mm
(3.5"),(4.5")
KB180 219 mm
(8.62")
13-20 mm
( 0 .51") - ( 0 .78")
234 mm
(9.2")
182 mm
(7.16")
DHD 360
QL 60 , SD-6
89, 114 mm
(3.5"),(4.5")
KB210 244 mm
(9.6")
13-20 mm
( 0 .51") - ( 0 .78")
260 mm
(10.25")
210 mm
(8.25")
DHD360/380
QL-60/80 , SD-6/8
114 mm
(4.5")
KB240 273 mm
(10.75")
16-20 mm
( 0 .63") - ( 0 .78")
305 mm
(12")
240 mm
(9.45")
DHD 380
QL 80 / SD-8
114,127mm
(4.5"), (5")
KB280 323 mm
(12.7")
13-22 mm
( 0 .51")( 0 .86")
348 mm
(13.7")
284 mm
(11.2")
DHD 380
QL-80 – SD-8/10
127 mm
(5")
KB365 406 mm
(16")
18-24 mm
( 0 .70") - ( 0 .94")
440 mm
(17.32")
364 mm
(14.33")
DHD 112
QL 120 , SD-10/ 12
127,140mm
(5"), (5.5")
KB410 457 mm
(18")
18-24 mm
( 0 .70") - ( 0 .94")
488 mm
(19.2")
413 mm
(16.25")
DHD 112
QL-120/200 , SD-15
127,140mm
(5"),(5.5")
KB460 508 mm
(20")
18-24 mm
( 0 .70") - ( 0 .94")
538 mm
(21.2")
464 mm
(18.26")
DHD 112S
QL 120/200 , SD-15/18
140 mm
(5.5")
KB510 558 mm
(22")
18-24 mm
( 0 .70") - ( 0 .94")
590 mm
(23.2")
514 mm
(20.2")
DHD 112S
QL 120/200 , SD-15/18 , N180
140 mm
(5.5")
KB560 610 mm
(24")
18 - 24 mm
( 0 .70") - ( 0 .94")
642 mm
(25.25")
566 mm
(22.3")
QL 200 ,
SD-18 , NUMA 180
140, 168mm
(5.5"),(6.6")
KB615 660 mm
(26")
18 - 24 mm
( 0 .70") - ( 0 .94")
694 mm
(27.3")
615 mm
(24.2")
QL 200 , SD-18
NUMA 180/240
168mm
(6.6")
KB665 711 mm
(28")
18 - 24 mm
( 0 .70") - ( 0 .94")
745 mm
(29.3")
665 mm
(26.2")
QL 200 , SD-18
NUMA180/240
168 mm
(6.6")
KB715 762 mm
(30")
18 - 24 mm
( 0 .70") - ( 0 .94")
798 mm
(31.4")
716 mm
(28.2")
QL 200 , SD-18
NUMA 180/240
168mm
(6.6")
KB815 863 mm
(34")
18 - 24 mm
( 0 .70") - ( 0 .94")
900 mm
(35.4")
815 mm
(32")
QL 200 , SD-18
NUMA 240
168 mm
(6.6")
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