219mm earth-covered drill collar bits, pilot bits, concentric bits

Product Description:Overburden Casing System,  also named Eccentric Casing System, is suitable for drilling water wells, geothermal wells, short mircopiles,medium mini-type grouting hole of building, diamond harbour project.Economy: Eccentric is the most economical solutions because its ingenious reaming wing the bit is ret

Featured Products

Product Description:

Overburden Casing System,  also named Eccentric Casing System, is suitable for drilling water wells, geothermal wells, short mircopiles,medium mini-type grouting hole of building, diamond harbour project.

Economy: Eccentric is the most economical solutions because its ingenious reaming wing the bit is retrievable can be used at the next hole.

Working Principle:

When drilling, the reamer bit will rotate out to enlarge the hole which enough for the casing tube slide down behind the reamer. When reached required depth, the drill pipe will drill to the reverse direction and the reamer bit will retract, It is allowing the whole drilling system to pass through the casing.


Competitive Advantage:

• High grade tungsten carbide inserts

• Bit bodies manufactured from high grade steel and processed using state-of-the-art CNC machinery and heat treatment


Specification:
Part Model
PA90PA115PA140PA165PA190
Casing Tube(max.O.D.)(mm)115142171195222
Casing Tube (min.O.D.) (mm)102128155.6182.6205
Guide SleeveEffective length: 174mmEffective length: 174mmEffective length: 205mmEffective length: 225mmEffective length: 250mm
Drill PipeConnection Thread: API2 3/8"Reg; O.D.: 76mm; Wrench Flats: 65mmConnection Thread: API2 3/8"Reg; O.D.: 76mm; Wrench Flats: 65mmConnection Thread: API2 3/8"Reg
O.D.: 89mm
Wrench Flats: 65mm
Connection Thread: API3 1/2"Reg
O.D.: 114mm
Wrench Flats: 95mm
Connection Thread: API3 1/2"Reg
O.D.: 114mm
Wrench Flats: 95mm
DTH HammerDHD35, COP2, MISSION30COP44, DHD340, MISSION40DHD55, COP54, MISSION50COP64, DHD360, MISSION60COP64,DHD360, MISSION60
Casing ShoeL3=90mm L4=55mm D3=101.7mm D4=93mmL3=76mm L4=55mm D3=127.5mm D4=117mmL3=90mm L4=63mm D3=155.3mm D4=143mmL3=95mm L4=55mm D3=181.5mm D4=166mmL3=110mm L4=70mm D3=204.7mm D4=193mm
Guide DeviceL1=35mm L2=138mm D1=92mm D2=100mmL1=48mm L2=136mm D1=115mm D2=126mmL1=55mm L2=160mm D1=141mm D2=154mmL1=61.5mm L2=181.5mm D1=165mm D2=178mmL1=62.8mm L2=185mm D1=191mm D2=203mm
ReamerD5=91mm L5=70mm Reaming Diameter: 123mm; Reamer has 4*Ф12 buttonsD5=114mm L5=89mm
Reaming Diameter: 152mm
Reamer has 5*Ф14 buttons
D5=138mm L5=69.5mm
Reaming Diameter: 185mm
Reamer has 7*Ф14 buttons
D5=164mm L5=79.5mm
Reaming Diameter: 211mm
Reamer has 7*Ф14 buttons
D5=185.5mm L5=90.2mm
Reaming Diameter: 237mm
Reamer has 7*Ф16 buttons
Pilot BitD6=90mm L6=59mm Gauge button: 8*Ф12 Front button:6*Ф10D6=114mm L6=67mm
Gauge button: 8*Ф14
Front button:6*Ф12
D6=138mm L6=66mm
Gauge button: 8*Ф16
Front button:8*Ф14
D6=165.8mm L6=82.5mm
Gauge button: 8*Ф16
Front button:8*Ф16
D6=190mm L6=82mm
Gauge button: 9*Ф18
Front button:9*Ф16
Different Shanks:

219mm Overburden Drilling Ring Bit, Pilot Bit, Concentric Drill Bit

Different Faces Shapes:

219mm Overburden Drilling Ring Bit, Pilot Bit, Concentric Drill Bit

Different Buttons Shapes:219mm Overburden Drilling Ring Bit, Pilot Bit, Concentric Drill Bit
A:When drilling starts working,reaming sleeve will open,borehole range will increase,which will casing shoe and casing tube.
B:When finish drilling in overburden layer,pay attention to reverse circulation,reaming sleeve circles up,eccentric drilling bit lifts out from the borehole.
C:The casing that can be left in the borehole to prevent borehole from collapsing while pulling out pipe and grouting concrete.
D:Regular drilling bits can be applied to drill the depth as required in the rock stratum.
219mm Overburden Drilling Ring Bit, Pilot Bit, Concentric Drill Bit

219mm Overburden Drilling Ring Bit, Pilot Bit, Concentric Drill Bit
FAQ:

Q1: Can I have a sample for testing?

A:Samples are still to be paid but discounted price can be provided. 

Q2: Do you have the inspection procedures?

A:100% strict inspection and testing for every order before packing.

Q3: How can i get the after sale services?

A:Free replacement will provide once the problems casued by our product quality.

Q4: Can I have a visit to your factory before the order?

 

A: Sure, welcome, here is our address: Yantai, Shandong.
 

CONTACT:


 

Contact us

Please feel free to give your inquiry in the form below We will reply you in 24 hours