Concentric Casing Drilling System with Jaws for Overburden

Rock Drilling Tools

Concentric Casing Drilling System with Jaws

The concentric three-wing casing drilling system is suitable for soft to medium formations such as clay, flowing sand, small gravel, and highly weathered rock (f ≤ 3).

Typical applications include overburden drilling for water wells, anchor cables, and similar projects.

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Typical Applications

Water well drilling

Anchoring

Technical Specifications

Model	O.D. of casing tube, mm	I.D. of casing tube, mm	Thickness, mm	Guide device max. diameter, mm	Reamed diameter, mm	Min. O.D. of casing shoe, mm	Quantity of blocks	DTH hammer	Weight, kg
ODEX 85	108	94	7	92	117	86	85	3.5''	10
ODEX 90	114	101	6.5	99	125	91	90	3.5''	12
ODEX 98	127	108	9.5	106	138	99.5	98	3.5''	14
ODEX 115	146	125	10	123.5	155	117	115	4''	25
ODEX 140	168	148	10	146	180	138	136	5''	37
ODEX 140	168	153	7.5	146	185	142.5	141	5''	38
ODEX 145	178	158	10	156	192	148	146	5''	42
ODEX 152	183	163	10	161	196	153	151	5'' 6''	46/50
ODEX 165	194	174	10	172	206	162	160	6“	58
ODEX 165	194	181	6.5	179	206	170	168	6“	62
ODEX 190	219	199	10	196	237	187	185	6“	72
ODEX 190	219	207	6	205	237	192	190	6“	74
ODEX 208	245	225	10	222	263	210	208	8''	106
ODEX 240	273	253	10	251	305	241	239	8''	132
ODEX 240	273	257	8	255	305	241	239	8''	134
ODEX 280	325	304	10.5	302	350	282	280	8'' 10'' 12''	205/220/240
Other specifications are available upon request.

Key Advantages

The center pilot bit provides excellent guiding performance. Compared with other drilling systems, borehole deviation is significantly reduced. Even thin-wall steel casing or PVC casing can be used safely, greatly reducing the risk of casing breakage.
The three reaming jaws are positioned on the same horizontal plane, enabling full-circumference rock breaking and significantly reducing the risk of tool jamming.
The jaws operate along a vertically oriented sliding track. Even if small amounts of sand or cuttings enter the gap between the jaws and the pilot bit, vibration generated during drilling helps clear the material quickly, effectively reducing sticking and jamming incidents.

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In what situations is a three-wing casing drilling system used?

It is typically used where high borehole verticality is required and the formation is relatively hard or contains larger gravels.

Can the three-wing casing drilling system be used in all formations?

It is suitable for most formations. For highly complex formations with frequent cavities or very deep oil and gas wells, a concentric casing drilling system with ring bits is recommended.

Why choose a three-wing casing drilling system?

The three-wing system performs well in relatively complex formations, provides reliable rock-breaking capability, and is simple to operate, making it a popular choice among users..