Mining Symmetric Overburden Drilling Equipment with Rings for Construction

• Customization: Available
• Customized: Customized
• Standard: ISO9001
• Model NO.: COP / DHD /QL
• Length: Stub-length
• Type: Drill Bits
• Material: Tungsten Carbide
• Usage: Water Well, Geothermal Drilling
• MOQ: 1 PCS
• Application: Water Well, Geothermal Well etc
• Transport Package: Wooden Package
• Specification: steel
• Trademark: BESTLINK
• Origin: China
• HS Code: 82071990
• Production Capacity: 50000 PCS / Month
• Package Size: 50.00cm * 60.00cm * 80.00cm
• Package Gross Weight: 100.000kg

Product Description

Symmetric Overburden Drilling Equipment

Symmetric Overburden Drilling Equipment is suitable for drilling water wells, geothermal wells, short mirco-piles,medium mini-type grouting hole of building, damand harbour project.

Applications:
Blast holes
Water supply wells
Bridge and building foundations
Standard slant or horizontal drilling
Mining air holes
Environmental monitoring wells
Grouting operations
Seismic shot holes
Soil sample and geotechnical applications
Ground anomaly and tiebacks
Storage caverns and dam

Features:
Casing drilling involves drilling and casing a well simultaneously through unstable ground conditions, In casing drilling process, down the hole tools can be retrieved, through the casing on wire-line, meaning tool recovery or replacement of tools can take minutes versus hours under conventional methods. This process employs wire line-retrievable tools and a drill-lock assembly, permitting bit and BHA changes, coring, electrical logging and even directional or horizontal drilling. Once the casing point is reached, the casing is cemented in place without tripping pipe.
 
Casing drilling has been employed in many countries as an effective method of reducing the overall drilling costs by reducing drilling time and drill string problems encountered during conventional drilling process.


Operation Process:
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.

Technical Data: 

Casing tube OD(mm)	Casing tube ID(mm)	Reamed Dia(mm)	Casing Shoe ID(mm)	Polit bit Dia(mm)	Hammer shank
108	93-99	118	86	77	DHD3.5/QL30
114	102-104	127	91	82	DHD3.5/QL30
127	115-117	136	101	92	DHD3.5/QL30
140	124-128	152	117	105	DHD340/SD4/QL40/M40
146	130-134	154	117	105	DHD340/SD4/QL40/M40
168	148-156	185	140	125	DHD350/SD5/QL50/M50
178	158-166	195	150	140	DHD350/SD5/QL50/M50
183	163-171	193	154	144	DHD350/SD5/QL50/M50
194	174-182	211	166	150	DHD360/SD6/QL60/M60
219	199-207	237	193	165	DHD360/SD6/QL60/M60
245	225-233	260	210	190	DHD380/SD8/QL80/M80
273	253-257	308	241	220	DHD380/SD8/QL80/M80
325	305-309	348	281	205	SD10/NUMA100
406	382-388	440	364	340	SD10/NUMA100

 
Package for casing system: