Xiamen Bestlink Factory Co., Ltd.  

Product Name: Symmetrix Overburden Casing Drilling System with Ring Bits Model NO.: COP / DHD /QL Usage: Well Drilling, Water Well, Geothermal Drilling Material: Tungsten Carbide Type: Drill Bits Length: Stub-length Certification: JIS, ISO9001 Customized: Customized MOQ: 1 PCS Application: Water Well, Geothermal Well etc Trademark: BESTlink Transport Package: Wooden Package Specification: steel Origin: China HS Code: 82071990 Product Description Symmetrix Overburden Casing Drilling System with Ring BitsSymmetric 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 holesWater supply wellsBridge and building foundationsStandard slant or horizontal drillingMining air holesEnvironmental monitoring wellsGrouting operationsSeismic shot holesSoil sample and geotechnical applicationsGround anomaly and tiebacksStorage caverns and damFeatures: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 toolscan 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 iscemented 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 problemsencountered 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 retrieved4. Drilling continues to the desired depth in the bedrock using a conventional drilling.Technical data:Casing tubeOD(mm)Casing tubeID(mm)Reamed Dia(mm)Casing Shoe ID(mm)Polit bit Dia(mm)Hammer shank10893-991188677DHD3.5/QL30114102-1041279182DHD3.5/QL30127115-11713610192DHD3.5/QL30140124-128152117105DHD340/SD4/QL40/M40146130-134154117105DHD340/SD4/QL40/M40168148-156185140125DHD350/SD5/QL50/M50178158-166195150140DHD350/SD5/QL50/M50183163-171193154144DHD350/SD5/QL50/M50194174-182211166150DHD360/SD6/QL60/M60219199-207237193165DHD360/SD6/QL60/M60245225-233260210190DHD380/SD8/QL80/M80273253-257308241220DHD380/SD8/QL80/M80325305-309348281205SD10/NUMA100406382-388440364340SD10/NUMA100Package for casing system: