Eccentric Casing system for mining

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US $950-2,000 / Pieces | 1 Piece/Pieces (Min. Order)
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Quick Details
Place of Origin:
Fujian, China (Mainland)
Brand Name:
Model Number:
Drill Bit
Machine Type:
Drilling Tool
Carbon Steel
Processing Type:
Well Drilling
mining/Quarry/Construction/Water well drilling
Supply Ability
Supply Ability:
5000 Piece/Pieces per Month
Packaging & Delivery
Packaging Details
wooden box
Lead Time :
Within 25 days after receiving your payment
Product Description

 Eccentric Reamer System Step-by-step  

1. When drilling starts, the reamer swings out and reams the pilot-hole wide enough for the casing tube to slide down behind the drill bit assembly.  

2. When the required depth is reached, rotation is reversed carefully, whereupon the reamer swings in , allowing the drill bit assembly to be pulled up through the casing.  

3. Casing tubes that are to be left in the drill hole should be sealed at the bottom of the hole by means of cement grout or some other sealing agent. 

4. Drilling continues to the desired depth in the bedrock using a conventional drill string.


Application Range 

This product is made of alloy of high quality and apply for advanced high-frequency welding technology and maturity of heat treatment process, greatly improving the intensity, wear resistance and impact toughness of cutter head, increasingly prolonging the working life, enhancing the drilling efficiency.

It is recommended to drill in rock formation where contains some ovals and fractures. 


Design Principles

 Make the casing follow easy and the equipment and operation simple 



Outstanding Advantages

The stable and reliable working performance and the less vibration of drill rig and flexible to open and close.

Order Guide:  product type.


Type1.Casing tube2.Drill pipe3.Guide sleeve4.DTH hammer5.Casing shoe6.Guide device7.Reamer 8.Pilot bit
HOD90Maximum OD:115mm Minimum ID:102mmconnection thread:API 2 3/8"REG OD:76mm wrech flats:65mmEffective length: 174mmHD35,COP32, IR3.5,QL30L3=90mm,L4=55mm, D3=101mm,D4=93mmL1=35mm,L2=138mm, D1=92mm,D4=100mmD5=91mm,L5=70mm, reaming diameter=123mm, reamer has4*Φ12buttonsD6=90mm,L6=59mm, gauge button=8*Φ12mm, face button:6*Φ10mm
HOD115Maximum OD:142mm Minimum ID:128mmconnection thread:API 2 3/8"REG OD:76mm wrech flats:65mmEffective length: 174mmHD45,COP44, SD4,DHD340A,QL40,HM4L3=76mm,L4=55mm, D3=127.5mm,D4=117mmL1=48mm,L2=136mm, D1=115mm,D4=126mmD5=114mm,L5=89mm, reaming diameter=152mm, reamer has5*Φ14buttonsD6=114mm,L6=67mm, gauge button=8*Φ14mm, face button:6*Φ13mm
HOD140Maximum OD:171mm Minimum ID:155.6mmconnection thread:API 2 3/8"REG OD:89mm wrech flats:65mmEffective length: 205mmHD55,COP54, SD5,DHD350R,QL50L3=90mm,L4=63mm, D3=155.3mm,D4=143mmL1=55mm,L2=160mm, D1=141mm,D4=154mmD5=138mm,L5=69.5mm, reaming diameter=185mm, reamer has7*Φ14buttonsD6=138mm,L6=66.5mm, gauge button=8*Φ16mm, face button:8*Φ14mm
HOD165Maximum OD:195mm Minimum ID:182.6mmconnection thread:API 3 1/2"REG OD:114mm wrech flats:95mmEffective length: 225mmHD65,COP64, SD6,DHD360, QL60L3=95mm,L4=55mm, D3=181.5mm,D4=166mmL1=61.5mm,L2=181.5mm, D1=165mm,D4=178mmD5=164mm,L5=79.5mm, reaming diameter=211mm, reamer has7*Φ14buttonsD6=165mm,L6=82.5mm, gauge button=8*Φ16mm, face button:8*Φ16mm
HOD190Maximum OD:222mm Minimum ID:205mmconnection thread:API 3 1/2"REG OD:114mm wrech flats:95mmEffective length: 285mmHD65,COP64, SD6,DHD360, QL60L3=110mm,L4=70mm, D3=204.5mm,D4=193mmL1=62.5mm,L2=184.5mm,D1=191mm,D4=203mmD5=185.5mm,L5=90.2mm, reaming diameter=237mm, reamer has7*Φ16buttonsD6=190mm,L6=82mm, gauge button=9*Φ18mm, face button:9*Φ16mm
HOD240Maximum OD:273mm Minimum ID:260.4mmconnection thread:API 3 1/2"REG OD:114mm wrech flats:95mmEffective length: 343mmHD85,COP84, SD8,DHD380, QL80L3=110mm,L4=65mm, D3=259mm,D4=241mmL1=70mm,L2=190mm, D1=240mm,D4=256mmD5=238mm,L5=100mm, reaming diameter=308mm, reamer has14*Φ16buttonsD6=240mm,L6=89.5mm, gauge button=12*Φ16mm, face button:18*Φ16mm
HOD280Maximum OD:324mm Minimum ID:305mmconnection thread:API 4 1/2"REG OD:114mm wrech flats:95mmEffective length: 305mmSD10,NUMA100L3=125mm,L4=75mm, D3=304mm,D4=281mmL1=97mm,L2=254mm, D1
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