Sistimi ea Concentric Casing

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Sekhechana sa mokhanni le selikalikoe li kopantsoe ho "concentric system bit" e loketseng 114-1067mm ea bophara ba tube.

Molemo:

1. Ntlafatsa ho kenella ka hare le perpendicularity
2. Fokotsa litlhoko tsa torque
3. Sebetsana le sekoti se otlolohileng, se oblique le masoba a mang a mahlakoreng
4. Phello e tlaase ka ho fetisisa e nang le tikoloho

Kantle 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

Sefate sa Kantle sa Casing Tube (mm)	Inner Dia Of Casing Tube(mm)	Reamed Dia(mm)	Min Inner Dia Of Casing Shoe(mm)	Lipeipi tsa ho Sebetsa(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