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Typical Applications

Concentric casing drilling systems are primarily used in foundation piling and anchoring projects.

Piling: Thanks to stable drilling performance and excellent borehole straightness, concentric casing systems are not affected by gravel layers or other complex ground conditions, making them highly suitable for foundation piling applications.

Anchoring: In anchoring operations, drilling is often performed at non-vertical angles and under complex geological conditions. Because concentric casing systems can drill at any inclination without being affected by formation conditions, they fully meet the practical requirements of anchoring projects.

Pile foundation

Anchoring

Technical Specifications

Model	O.D. of casing tube, mm	I.D.of casing tube, mm	Thickness, mm	Max. O.D. of pilot bit, mm	O.D. of ring bit, mm	Max. O.D. of common bit, mm	Hammer shank	Weight, kg
Model	D	I.D.of casing tube, mm	h	H	C	G	Hammer shank	Weight, kg
108	108	94	7	92	118	75	3.5''	10.5
114	114	101	6.5	99	126	82	3.5''	14
127	127	108	9.5	106	138	86	3.5''	18
140	140	114	9	120	151	101	4''	21
146	146	126	10	124	156	105	4''	23.5
168	168	148	10	146	184	125	5''	27.5
178	178	158	10	156	192	140	5''	42
194	194	174	10	172	206	148	6''	58
219	219	198	10.5	196	234	170	6''	75
245	245	219.6	12.7	218	260	186	6''	105
273	273	249.6	12.7	245	298	203	8''	122
325	325	299.6	12.7	295	350	255	8'' 10''	135
406	406	380.6	12.7	378	438	340	12''	420
508	508	482.6	12.7	478	538	445	18''	522
560	560	534.6	12.7	521	580	495	18''	608
610	610	631.6	14.2	574	630	514	18''	703
660	660	682.6	14.2	618	680	590	18''	788
722	722	730	14.2	674	731	606	18''	934.5
762	762	781	16	724	782	669	18''	1247
813	813	882	16	769	835	709	24''	1380
914	914	984	16	851	935	818	24''	1657
1016	1016	1180	20	973	1040	913	28''	2100
1220	1220	1510	20	1174	1250	1136	28''	3270
1550	1550			1504	1580	1464	36''	5405

Under what conditions is a concentric casing drilling system with ring bits required?

Commonly used in deep drilling projects, such as deep water wells, oil wells, natural gas wells, shale gas, and coalbed methane wells, where significant drilling depth is required.
Widely applied in large-scale foundation piling projects, where large borehole diameters are required and conventional drilling tools are insufficient.
Used in harsh and complex geological conditions, such as interbedded formations, karst cavities, formation air loss, or flowing sand layers.

Can concentric casing drilling systems with ring bits be used in all formations?

At present, for casing advancement projects that cannot be completed using concentric casing systems with ring bits, there are generally no alternative casing drilling systems capable of successfully performing the task.