Eccentric Overburden Drilling Equipment

Eccentric drill bit is used for casing following drilling while drilling in soil layer.

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Operating Steps Of Eccentric Reamer

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At the beginning of drilling, the eccentric reaming sleeve spins out along the eccentric guide bit and begins reaming to ensure that the casing and drilling system advance simultaneously.the first stepWhen drilling into the right position, carefully reverse, eccentric reaming sleeve cycle, and eccentric drilling system from the casing pull out.the second step
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The casing is pulled upwards and the concrete slurry or other filler is sprinkled at the bottom of the hole.the third stepConventional drilling tools are used in the bedrock to reach the required depth.the forth step

 

Specification Of Eccentric Overburden Drilling Equipment

Type① Casing Tube② Drill Pipe③ Guide Sleeve④ TH-hammer⑤⑥⑦⑧
Casing ShopGuide DeviceReamerPilot bit
NOD90Maximun: 115mmConnection Thread:Effective length:ND35, Cop32, IR3.5, NQL30L3=90mm L4=55mm D3=101.7mm D4=93mmL1=35mm L2=138mm D1=92mm D2=100mmD5=91mm L5=70mmD6=90mm L6=59mm
Minmum: 102mmAPI2 3/8”Reg174mmReaming Diameter: 123mmGauge button
O.D: 76mmReamer has 4XФ12 buttons8 X Ф12
Wrench Flats: 65mmFront button
6 X Ф10
NOD115Maximun: 142mmConnection Thread:Effective length:ND45, Cop44, NSD4, DHD340A, NQL40, NM4L3=76mm L4=55mm D3=127.5mm D4=117mmL1=48mm L2=136mm D1=115mm D2=126mmD5=114mm L5=89mmD6=114mm L6=67mm
Minmum: 128mmAPI2 3/8”Reg174mmReaming Diameter: 152mmGauge button
O.D: 76mmReamer has 5XФ14 buttons8 X Ф14
Wrench Flats:Front button
65mm6 X Ф12
NOD140Maximun: 168mmConnection Thread:Effective length:ND55, Cop54, NSD5, DHD350R, NQL50L3=90mm L4=63mm D3=155.3mm D4=143mmL1=55mm L2=160mm D1=141mm D2=154mmD5=138mm L5=69.5mmD6=138mm L6=66mm
Minmum: 155.40mmAPI2 3/8”Reg205mmReaming Diameter: 185mmGauge button
O.D: 89mm8 X Ф16
Wrench Flats:Reamer has 7XФ14 buttonsFront button
65mm8 X Ф14
NOD165Maximun: 193.70mmConnection Thread:Effective length:ND65, Cop64, NSD6, DHD360, NQL60L3=95mm L4=55mm D3=181.5mm D4=166mmL1=61.5mm L2=181.5mm D1=165mm D2=178mmD5=164mm L5=79.5mmD6=165.80mm L6=82.50mm
Minmum: 181mmAPI2 1/2”Reg225mmReaming Diameter: 211mmGauge button
O.D: 114mmReamer has 7XФ14 buttons8 X Ф16
Wrench Flats:Front button
65mm8 X Ф16
NOD190Maximun: 219mmConnection Thread:Effective length:ND65, Cop64, NSD6, DHD360, NQL60L3=110mm L4=70mm D3=204.7mm D4=193mmL1=62.8mm L2=185mm D1=191mm D2=203mmD5=164mm L5=79.5mmD6=165.80mm L6=82.50mm
Minmum: 205mmAPI2 1/2”Reg225mm211mmGauge button
O.D: 114mmReamer has 7XФ14 buttons8 X Ф16
Wrench Flats:Front button
95mm8 X Ф16
NOD240Maximun: 273mmConnection Thread:Effective length:ND85, Cop84, NSD8, DHD380, NQL80L3=110mm L4=65mm D3=259mm D4=241mmL1=70mm L2=190mm D1=240mm D2=257mmD5=238mm L5=100mmD6=240mm L6=89.50mm
Minmum: 260.4mmAPI2 1/2”Reg343mmReaming Diameter: 308mmGauge button
O.D: 114mmReamer has 16XФ16 buttons12 X Ф18
Wrench Flats:Front button
95mm32 X Ф16
NOD280Maximun: 324mmConnection Thread:Effective length:NSD10, NUMA100L3=125mm L4=75mm D3=304mm D4=281mmL1=97mm L2=254mm D1=280mm D2=303mmD5=266mm L5=120mmD6=280mm L6=135mm
Minmum: 305mmAPI2 1/2”Reg305mmReaming Diameter: 378mmGauge button
O.D: 114mmReamer has 22XФ18 buttons12 X Ф18
Wrench Flats:Front button
95mm27 X Ф16

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