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Symmetric Overburden Drilling Equipment

Overburden Drilling
Model:ND55/ND35/ND45/ND55/ND65/ND85
NSD10/NSD475/NSD525
NQL4/NQL5/NQL6/NQL8
SD15/SD18
N125
China market:yang.riquan@xjgdrill.com
Overseas market:rick.liao@xjgdrill.com
Product details
Advantages of symmetric Drilling



1.Sound drilling straightness and fast drilling speed.

  Theoretically,symmetric drilling makes sure the hole in all formations such as gravel bed,sand bed and pebble bed etc.is considerably straight,the drilling speed fast and the drilling torque relatively small.

2.The torque necessary for symmertic drilling is much less than for eccentric dirlling.

  A smooth and steady drilling may be achieved using ring bit on all conditions and create big hole even if a small drilling rig is used.

3.Unlocking-relocking can be relatively easily achieved.

  Unlocking the system is sometimes required during process.Relocking is easy since there are no eccentric components that must be opened or closed inside the hole.

4.Drilling can be carried out at ant angle.

  Symmetric drilling can shape the hole at any angle.

5.Effective cuttings discharge.

  The airflow for cutting discharge purpose during the symmetric drilling will instantly ascend along the casing pipe after spurting out from the pilot bit.Hence,the negligible damage on the wall of hole can guarantee effective cutting discharge.

6.Easy-to-operate and system security

  Drilling workers are relieved of the need to maintain their continuous and constant attention on drilling process since symmetric drilling can carry on smoothly.

7.Economical and cost-effective.

  The structure and principle of operation of symmetric drilling system can guarantee considerable reduction in downtime,fewer consumable and lower operation costs.








 

Product model

Casing ODmm

Casing wall max  mm

Ring bit ODmm

Ring bit OD

mm

Pilot bte ODmm

hammer

NSOD114

114.3

6/10

91/78

128/124

100/92.5

ND35

NSOD127

126.7

7

99

140

110

ND35

NSOD140

139.7

7/10

116/94

154/150

124/117.5

ND45/NQL4

NSOD168

168.3

8/12.7

142/121

182/178

150/140

ND55/NQL5

NSOD178

178.3

10

145

195

156

ND55/NQL5

NSOD194

193.7

6/12.7

167/148

212/203

180/167

ND65/NQL6

NSOD219

219.1

7/12.7

186/167

234

203/191

ND65/NQL6

NSOD273

273.0

8/12.7

232/219

292

255/246

ND85/NQL8

NSOD325

323.9

8/12.7

281/270

342/342

306/297

ND85/NQL8

NSOD406

406.4

12.7

328

419

374

NSD10/N125

NSOD508

508.0

15

412

526

470

ND475/SD15

NSOD609

609.6

15

513

637

570

ND525/SD18


Drilling steps for core heel pipe

1

2

 

    Before drilling, the annular bit and tube shoe assembly are welded with the bushing, then the guided bit is locked with the ring drill pipe shoe assembly, guiding the drill bit shoulder to engage with the pipe boots.

    The impact of the impactor can be spread to the guide bit and the ring bit to start the rock breaking, and some of the energy will drive the casing forward.

 

3

4

 

    After the end of the drilling, the drill is retrieved by the unlocking of a gently reverse transfer port connection. The ring bit is left in the hole, and when the hole is finished, the ring bit is taken out together when the casing is pulled out.

   In the bedrock, if further drilling is needed, the guide bit is replaced by a suitable standard bit.

 



Domestic:+86 730 6808685

International:+86 731 89708148

Address:岳阳市平江工业园

yueyang city ping jiang industrial park


Email:China market:yang.riquan@xjgdrill.com
Overseas market:rick.liao@xjgdrill.com
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