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Website: http://rockdrilltool-en.com/eccentric-casing-drilling-system-1-5-1.html

Typical Applications

Rock drilling projects where borehole collapse or hole instability is likely to occur, and where eccentric casing systems can effectively address these risks.

Water well drilling

Anchoring

Micro-piling

Technical Specifications

Model	O.D. of casing tube, mm	I.D. of casing tube, mm	Thickness, mm	Guide device max diameter, mm	Reamered diameter, mm	Min. I.D. of casing tube, mm	Max. O.D. of normal bit, mm	Matched DTH hammer	Weight, kg
ODEX 85	108	94	7	92	117	86	85	3.5''	11.6
ODEX 90	114	101	6.5	99	125	91	90	3.5''	13.5
ODEX 98	127	108	9.5	106	138	99.5	98	3.5''	15.5
ODEX 115	146	125	10	123.5	155	117	115	4''	25/28
ODEX 140	168	148	10	146	180	138	136	5''	42
ODEX 140	168	153	7.5	146	185	142.5	141	5''	43
ODEX145	178	158	10	156	192	148	146	5''	45
ODEX 152	183	163	10	161	196	153	151	5'' 6''	48/56
ODEX 165	194	174	10	172	206	162	160	6“	62
ODEX 165	194	181	6.5	179	206	170	168	6“	65
ODEX 190	219	199	10	196	237	187	185	6“	76
ODEX 190	219	207	6	205	237	192	190	6“	78
ODEX 208	245	225	10	222	263	210	208	8''	110
ODEX 240	273	253	10	251	305	241	239	8''	136
ODEX 240	273	257	8	255	305	241	239	8''	138
ODEX 280	325	304	10.5	302	350	282	280	8'' 10'' 12''	210/226/246

Custom manufacturing available upon request.

Under what conditions is an eccentric casing drilling system required?

In soft or unconsolidated formations, conventional drilling may lead to borehole collapse or sticking of drilling tools.

To prevent tool loss caused by hole collapse, casing advancement systems are required. Among various casing systems, eccentric casing drilling systems are the most widely used and easiest to operate.

Can eccentric casing drilling systems be used in all geological formations?

No. Eccentric casing systems have certain application limitations.

They are not suitable for formations containing large-diameter cobbles, boulders, or complex geological conditions such as karst cavities.