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Eccentric Overburden Drilling System
BESTLINK
Application Range:
The eccentric overburden drilling system is suitable for drilling water wells, geothermal wells, micro piles, and medium mini-type grouting holes in buildings, dams and harbor projects.
Design Principles:
The casing makes the drilling system easy to follow and operate.
Outstanding Advantages:
Simple structure, easy operation, reliable quality, retrievable drilling tools, and long service life.
Operation Procedure
As soon as the drilling starts, the reamer opens and enlarges the hole to drive the casing shoe and casing tube down.
When drilling in over-burden formation is complete, start reverse circulation in order to close the reamer. Then pull up the assembly through the casing tube.
The casing tube can be left in the hole, or can be pulled out by means of grout sealing material.
Use the normal drilling tools to drill and achieve the desired depth.
Type | 1.Casing tube | 2.Drill pipe | 3.Guide sleeve | 4.DTH hammer | 5.Casing shoe | 6.Guide device | 7.Reamer | 8.Pilot bit |
HOD90 | Maximum OD:115mm Minimum ID:102mm | connection thread:API 2 3/8"REG OD:76mm wrech flats:65mm | Effective length: 174mm | HD35,COP32, IR3.5,QL30 | L3=90mm,L4=55mm, D3=101mm,D4=93mm | L1=35mm,L2=138mm, D1=92mm,D4=100mm | D5=91mm,L5=70mm, reaming diameter=123mm, reamer has4*Φ12buttons | D6=90mm,L6=59mm, gauge button=8*Φ12mm, face button:6*Φ10mm |
HOD115 | Maximum OD:142mm Minimum ID:128mm | connection thread:API 2 3/8"REG OD:76mm wrech flats:65mm | Effective length: 174mm | HD45,COP44, SD4,DHD340A,QL40,HM4 | L3=76mm,L4=55mm, D3=127.5mm,D4=117mm | L1=48mm,L2=136mm, D1=115mm,D4=126mm | D5=114mm,L5=89mm, reaming diameter=152mm, reamer has5*Φ14buttons | D6=114mm,L6=67mm, gauge button=8*Φ14mm, face button:6*Φ13mm |
HOD140 | Maximum OD:171mm Minimum ID:155.6mm | connection thread:API 2 3/8"REG OD:89mm wrech flats:65mm | Effective length: 205mm | HD55,COP54, SD5,DHD350R,QL50 | L3=90mm,L4=63mm, D3=155.3mm,D4=143mm | L1=55mm,L2=160mm, D1=141mm,D4=154mm | D5=138mm,L5=69.5mm, reaming diameter=185mm, reamer has7*Φ14buttons | D6=138mm,L6=66.5mm, gauge button=8*Φ16mm, face button:8*Φ14mm |
HOD165 | Maximum OD:195mm Minimum ID:182.6mm | connection thread:API 3 1/2"REG OD:114mm wrech flats:95mm | Effective length: 225mm | HD65,COP64, SD6,DHD360, QL60 | L3=95mm,L4=55mm, D3=181.5mm,D4=166mm | L1=61.5mm,L2=181.5mm, D1=165mm,D4=178mm | D5=164mm,L5=79.5mm, reaming diameter=211mm, reamer has7*Φ14buttons | D6=165mm,L6=82.5mm, gauge button=8*Φ16mm, face button:8*Φ16mm |
HOD190 | Maximum OD:222mm Minimum ID:205mm | connection thread:API 3 1/2"REG OD:114mm wrech flats:95mm | Effective length: 285mm | HD65,COP64, SD6,DHD360, QL60 | L3=110mm,L4=70mm, D3=204.5mm,D4=193mm | L1=62.5mm,L2=184.5mm,D1=191mm,D4=203mm | D5=185.5mm,L5=90.2mm, reaming diameter=237mm, reamer has7*Φ16buttons | D6=190mm,L6=82mm, gauge button=9*Φ18mm, face button:9*Φ16mm |
HOD240 | Maximum OD:273mm Minimum ID:260.4mm | connection thread:API 3 1/2"REG OD:114mm wrech flats:95mm | Effective length: 343mm | HD85,COP84, SD8,DHD380, QL80 | L3=110mm,L4=65mm, D3=259mm,D4=241mm | L1=70mm,L2=190mm, D1=240mm,D4=256mm | D5=238mm,L5=100mm, reaming diameter=308mm, reamer has14*Φ16buttons | D6=240mm,L6=89.5mm, gauge button=12*Φ16mm, face button:18*Φ16mm |
HOD280 | Maximum OD:324mm Minimum ID:305mm | connection thread:API 4 1/2"REG OD:114mm wrech flats:95mm | Effective length: 305mm | SD10,NUMA100 | L3=125mm,L4=75mm, D3=304mm,D4=281mm | L1=97mm,L2=254mm, D1=280mm,D4=203mm | D5=266mm,L5=120mm, reaming diameter=378mm, reamer has22*Φ18buttons | D6=280mm,L6=135mm, gauge button=12*Φ18mm, face button:27*Φ16mm |
Application Range:
The eccentric overburden drilling system is suitable for drilling water wells, geothermal wells, micro piles, and medium mini-type grouting holes in buildings, dams and harbor projects.
Design Principles:
The casing makes the drilling system easy to follow and operate.
Outstanding Advantages:
Simple structure, easy operation, reliable quality, retrievable drilling tools, and long service life.
Operation Procedure
As soon as the drilling starts, the reamer opens and enlarges the hole to drive the casing shoe and casing tube down.
When drilling in over-burden formation is complete, start reverse circulation in order to close the reamer. Then pull up the assembly through the casing tube.
The casing tube can be left in the hole, or can be pulled out by means of grout sealing material.
Use the normal drilling tools to drill and achieve the desired depth.
Type | 1.Casing tube | 2.Drill pipe | 3.Guide sleeve | 4.DTH hammer | 5.Casing shoe | 6.Guide device | 7.Reamer | 8.Pilot bit |
HOD90 | Maximum OD:115mm Minimum ID:102mm | connection thread:API 2 3/8"REG OD:76mm wrech flats:65mm | Effective length: 174mm | HD35,COP32, IR3.5,QL30 | L3=90mm,L4=55mm, D3=101mm,D4=93mm | L1=35mm,L2=138mm, D1=92mm,D4=100mm | D5=91mm,L5=70mm, reaming diameter=123mm, reamer has4*Φ12buttons | D6=90mm,L6=59mm, gauge button=8*Φ12mm, face button:6*Φ10mm |
HOD115 | Maximum OD:142mm Minimum ID:128mm | connection thread:API 2 3/8"REG OD:76mm wrech flats:65mm | Effective length: 174mm | HD45,COP44, SD4,DHD340A,QL40,HM4 | L3=76mm,L4=55mm, D3=127.5mm,D4=117mm | L1=48mm,L2=136mm, D1=115mm,D4=126mm | D5=114mm,L5=89mm, reaming diameter=152mm, reamer has5*Φ14buttons | D6=114mm,L6=67mm, gauge button=8*Φ14mm, face button:6*Φ13mm |
HOD140 | Maximum OD:171mm Minimum ID:155.6mm | connection thread:API 2 3/8"REG OD:89mm wrech flats:65mm | Effective length: 205mm | HD55,COP54, SD5,DHD350R,QL50 | L3=90mm,L4=63mm, D3=155.3mm,D4=143mm | L1=55mm,L2=160mm, D1=141mm,D4=154mm | D5=138mm,L5=69.5mm, reaming diameter=185mm, reamer has7*Φ14buttons | D6=138mm,L6=66.5mm, gauge button=8*Φ16mm, face button:8*Φ14mm |
HOD165 | Maximum OD:195mm Minimum ID:182.6mm | connection thread:API 3 1/2"REG OD:114mm wrech flats:95mm | Effective length: 225mm | HD65,COP64, SD6,DHD360, QL60 | L3=95mm,L4=55mm, D3=181.5mm,D4=166mm | L1=61.5mm,L2=181.5mm, D1=165mm,D4=178mm | D5=164mm,L5=79.5mm, reaming diameter=211mm, reamer has7*Φ14buttons | D6=165mm,L6=82.5mm, gauge button=8*Φ16mm, face button:8*Φ16mm |
HOD190 | Maximum OD:222mm Minimum ID:205mm | connection thread:API 3 1/2"REG OD:114mm wrech flats:95mm | Effective length: 285mm | HD65,COP64, SD6,DHD360, QL60 | L3=110mm,L4=70mm, D3=204.5mm,D4=193mm | L1=62.5mm,L2=184.5mm,D1=191mm,D4=203mm | D5=185.5mm,L5=90.2mm, reaming diameter=237mm, reamer has7*Φ16buttons | D6=190mm,L6=82mm, gauge button=9*Φ18mm, face button:9*Φ16mm |
HOD240 | Maximum OD:273mm Minimum ID:260.4mm | connection thread:API 3 1/2"REG OD:114mm wrech flats:95mm | Effective length: 343mm | HD85,COP84, SD8,DHD380, QL80 | L3=110mm,L4=65mm, D3=259mm,D4=241mm | L1=70mm,L2=190mm, D1=240mm,D4=256mm | D5=238mm,L5=100mm, reaming diameter=308mm, reamer has14*Φ16buttons | D6=240mm,L6=89.5mm, gauge button=12*Φ16mm, face button:18*Φ16mm |
HOD280 | Maximum OD:324mm Minimum ID:305mm | connection thread:API 4 1/2"REG OD:114mm wrech flats:95mm | Effective length: 305mm | SD10,NUMA100 | L3=125mm,L4=75mm, D3=304mm,D4=281mm | L1=97mm,L2=254mm, D1=280mm,D4=203mm | D5=266mm,L5=120mm, reaming diameter=378mm, reamer has22*Φ18buttons | D6=280mm,L6=135mm, gauge button=12*Φ18mm, face button:27*Φ16mm |
