Concentric Casing System

Concentric casing 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....

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There are two types Concentric casing system, one is Permanent type, the other is Retrievable type.

 

Operation Procedure kindly check below: 

Permanent

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1. When drilling starts, the pilot bit drive the ring bit down to the hole, followed the casing shoe and casing tube.

2. At the bedrock, start Reverse circulation of tools and pull the pilot bit from the drill hole leaving the ring bit in the hole.

3. Pour the concrete or do the next constructions work.

 

Retrievable

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1.After the drilling starts, the pilot bit drive the ring bit down to the

hole, followed the casing shoe and casing tube.

2. At the bedrock, start Reverse circulation of tools and pull the pilot

bit back from the drill hole leaving 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.

 

Concentric Overburden Casing Drilling System

ModelOuter Dia. of Casing TubeInner Dia. of Casing TubeWall thickness of casingRing Bit Outer DiaRing Bit Inner DiaMax Outer Dia of Normal BitsHammer Type
(mm)(mm)(mm)(mm)(mm)(mm)
For DTH Drilling
R114/6.5-801141016.51228078COP32/COP34/DHD3.5/BR3/MACH303
R127/10-93127107101369391
R133/10-96133113101419694COP44/DHD340/MACH44/MISSION40/   SD4/XL4/QL40
R139/10-10213911910147102100
R152/10-11415213210160114112
R168/10-13016810148177130128COP54/DHD350/MACH50/MISSION50/   SD5/QL50
R177/10-13917710157187139137
R193/12.7-152193167.612.7203152150COP62/COP64/DHD360/MISSION60/SD6/  XL6/QL60/
R219/12.7-175219193.612.7232175173
R244/12.7-198244218.612.7254198196COP84/DHD380/SD8/QL80
R254/12.7-205254228.612.7266205203
RP273/12.7-224273247.612.7285224222
R323/12.7-271323297.612.7338271269
R406/12.7-350406380.612.7420350348DHD112/QL120/SD12/NUMA120
R457/12.7-376457431.612.7477376374
R508/16-44450847616524444442
R558/16-49155852616575491489QL200/SD18/NUMA180
R609/16-55360957716637553551
R660/16-59066062816678590588
R711/16-63971167916731639637QL200S
R762/16-69076273016781690688
R812/16-73481278016834734732
R863/16-78886383116882788786
R914/16-83591488216935835833
R1016/16-9111016984161033911909QL300

Casing System-1

Casing System-2

Casing System-4

Casing System-5


Key Words: 

Concentric Casing Drilling System,

Concentric Overburden Casing Drilling System

Symmetric Casing Drilling System,

Symmetric Overburden Casing Drilling System

Symmetric / Concentric Overburden Casing Drilling System

Concentric Casing System with Blocks

Retrievable Concentric Symmetrix Casing System

Concentric system Symmetrix Overburden Casing System With Wings

Recirculation Concentric Overburden Casing System

Geothermal well eccentric overburden casing drilling


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