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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
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
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