Symmetrix (Symmetric) Overburden Casing Drilling Systems

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US $500-6,000 / Units | 1 Unit/Units (Min. Order)
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Overview
Quick Details
Place of Origin:
Fujian, China (Mainland)
Brand Name:
bestlink
Type:
Center Drill Bit
Material:
Tungsten Carbide
Use:
Well Drilling
SupplyAbility
SupplyAbility:
1000 Unit/Units per Month
Packaging & Delivery
Port
xiamen
Lead Time :
30Days

The Drill symmetric/Concentric drilling 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. 

Application Range
: It is suitable for drilling water wells , geothermal wells , short miscopies ,medium mini-type grouting hole of building , dam and harbor project . 
1. Ring bit and casing shoe assembly is welded to casing prior to drilling. Lock the assembly into pilot bit with hammer. The pilot bit's upper shoulder engages the shoulder of the casing shoe. 
2. Hammer's percussive energy is transferred through the pilot and ring bits, crushing rock . Part of impact energy advances casing. 
3. On completion of drilling and casing , the drill string with pilot bit is retrieved by a slight reverse rotation to unlock the bayonet coupling . The ring bit stays in the hole , and can be recovered only if the casing is retrieved 
4. Drilling continues to the desired depth in the bedrock using a conventional drilling.

 

Outer Dia. of
Casing Tube
Inner Dia. of
Casing Tube
Reamed Dia. Min. Inner Dia. of
Casing Shoe
 Drill PipesMax. Outer Dia. of
Normal Bit
mmMmmmmmmmmm
10893-99118867677
114101-103127917682
127114-1161361017692
140124-12715211776105
146127-13215411776105
168149-15518414076,89125
178159-16519415076,89140
193173-18020616489,114150
219199-20623418489,114165
244224-231260210114190
273251-257305240114,127220
323301-310348284127255
406382-388440364140340
457433-439488413140385
508484-490538464140440