Concentric Casing System
A driver bit and a ring are assembled to a complete concentric system bit which is suit for 114-1067mm diameter tube.
Advantage:
1. Enhance penetration and perpendicularity
2. Reduce torque requirements
3. Deal with straight, oblique hole and other angle holes
4. Lowest effect with environment
2. Reduce torque requirements
3. Deal with straight, oblique hole and other angle holes
4. Lowest effect with environment
External dia.(mm): 125/155/188/215/238/276/293/345/375/432...1090
Casing dia.(OD*ID,mm): 114*102/139*127/168*153/194*181...1067*1041
Casing dia.(OD*ID,mm): 114*102/139*127/168*153/194*181...1067*1041
|
Outer Dia Of Casing Tube (mm)
|
Inner Dia Of Casing Tube(mm)
|
Reamed Dia(mm)
|
Min Inner Dia Of Casing Shoe(mm)
|
Drill Pipes(mm)
|
Max.Outer Dia of Normal Bit(mm)
|
|
114
|
101-103
|
127
|
91
|
76
|
77
|
|
127
|
114-116
|
136
|
101
|
76
|
82
|
|
140
|
124-127
|
152
|
117
|
76
|
92
|
|
146
|
127-132
|
154
|
117
|
76
|
105
|
|
168
|
149-155
|
184
|
140
|
76
|
105
|
|
178
|
159-165
|
194
|
150
|
76.89
|
125
|
|
193
|
173-180
|
206
|
164
|
76.89
|
140
|
|
219
|
199-206
|
234
|
184
|
89.114
|
150
|
|
244
|
224-231
|
260
|
210
|
89.114
|
165
|
|
273
|
251-257
|
305
|
240
|
114
|
190
|
|
323
|
301-310
|
348
|
284
|
114.127
|
220
|
|
406
|
382-388
|
440
|
364
|
127
|
255
|
|
457
|
433-439
|
488
|
413
|
140
|
340
|
|
508
|
484-490
|
538
|
464
|
140
|
385
|
|
558
|
534-540
|
590
|
514
|
140
|
440
|
|
610
|
586-592
|
642
|
566
|
140
|
485
|
|
660
|
636-642
|
694
|
615
|
168
|
540
|
|
711
|
687-693
|
745
|
665
|
168
|
590
|
|
762
|
738-744
|
798
|
716
|
168
|
640
|
|
863
|
839-845
|
900
|
815
|
168
|
685
|
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