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")
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