ODEX Eccentric Overburden Drilling System for water well drilling
ODEX Eccentric Overburden Drilling System for water well drilling
Roschen company's eccentric drilling tool, comprising rod stabilizer and eccentric drill bit, the tail of eccentric drill bit is provided with the first boss, the inner wall of the rod stabilizer is provided with the first groove matched with the first boss, and the inner wall of the rod stabilizer is provided with the first limiting groove along the circumferential direction, the outer wall of the tail is provided with annular groove, the rod stabilizer is provided with a mounting hole, and when the mounting hole is equipped with a pin rod, the pin rod can be stuck in the annular groove.
ODEX Eccentric Overburden Drilling System
Range for casing dia 4 1/2"-12 3/4'
Hammer shank DHD, SD, Mission, QL, etc
Model:
ODEX76, ODEX90, ODEX115, ODEX140, ODEX165, ODEX190, ODEX240, ODEX280
Product Description
ODEX system is a down-hole hammer system that is designed to advance casing during dilling.
ROSCHEN ODEX system is composite of Pilot bit, reaming bit and guide device.
They are made of high quality alloy steel and carbide with strict heat treatment. ROSCHEN ODEX system have been improven in
many work sites in many areas. 
| ODEX ECCENTRIC CASING DRILLING SYSTEM - Typical Parameters | ||
| Parameter | Typical Range/Options | Notes |
| Casing Diameter (OD) | 114 mm (4.5"), 140 mm (5.5"), 168 mm (6.5"), 194 mm (7.5") | Most common sizes. Larger/custom available. |
| Drilled Hole Diameter | ~ 1.3x - 1.5x Casing OD | Determined by Eccentric Reamer size. |
| Reamer Material | Tungsten Carbide Inserts, Hard Alloy Steel | High wear resistance. |
| Casing Type | Flush Joint, High-Tensile Steel | Ensures strength and smooth advancement. |
| Driving Method | Top-Hammer (DTH Hammers), Rotary (Down-the-Hole or ODEX Hammer) | Compatible with standard drilling rigs. |
| Typical Depths | Up to 100+ meters (300+ feet) | Depends on ground conditions & rig capacity. |
Specifications:
| ODEX Type | Recommended Casing Size | Min. Wall Thickness | Pilot Bit Diameter | Reamer Diameter | For Shanks of Hammer | ||||||
| Max. OD | Min. ID | ||||||||||
| mm | inch | mm | inch | mm | inch | mm | inch | mm | inch | ||
| 90 | 115 | 4 1/2 | 102 | 4 | 6 | 15/64 | 90 | 3 35/64 | 123 | 4 27/32 | DHD3.5, Cop34, Mission 30 |
| 115 | 142 | 5 19/32 | 125 | 4 59/64 | 7 | 9/32 | 115 | 4 17/32 | 155 | 6 7/64 | DHD340A, SD4, QL40, Mission40 |
| 115 | 146 | 5 3/4 | 128 | 5 3/64 | 7 | 9/32 | 116 | 4 9/16 | 152 | 6 | |
| 140 | 168 | 6 5/8 | 152 | 5 63/64 | 8 | 5/16 | 140 | 5 1/2 | 189 | 7 7/16 | DHD350R, SD5, QL50, Mission50 |
| 144 | 178 | 7 | 160 | 6 19/64 | 9 | 23/64 | 144 | 5 9/16 | 192 | 7 9/16 | |
| 165 | 196 | 7 23/32 | 183 | 7 13/64 | 6 | 15/64 | 166 | 6 17/32 | 211 | 8 19/64 | DHD360, SD6, QL60, Mission60 |
| 180 | 219 | 8 5/8 | 194 | 7 5/8 | 6 | 15/64 | 179 | 7 3/64 | 232 | 9 1/8 | |
| 190 | 219 | 8 5/8 | 205 | 8 1/16 | 7 | 9/32 | 191 | 7 1/2 | 236 | 9 19/64 | |
| 190 | 219 | 8 5/8 | 205 | 8 1/16 | 7 | 9/32 | 191 | 7 1/2 | 236 | 9 19/64 | DHD380, QL80, SD8, Mission 80 |
| 230 | 273 | 10 3/4 | 250 | 9 27/32 | 11.5 | 29/64 | 229 | 9 1/64 | 286 | 11 1/4 | |
| 240 | 273 | 10 3/4 | 250 | 9 27/32 | 11.5 | 29/64 | 241 | 9 31/64 | 308 | 12 1/8 | |
| 280 | 324 | 12 3/4 | 305 | 12 | 9.5 | 3/8 | 280 | 11 1/64 | 378 | 14 57/64 | SD10, NUMA100 |
Advantages
1. Applicable to weakly stable layers: The eccentric design can provide better wellbore stability and casing guidance in loose, porous, and easily collapsed formations.
2. Fast construction speed: Some processes allow direct completion of drilling and casing installation without mud construction. So that greatly shortening the construction period.
3. Reduce wellbore friction: The eccentric casing forms irregular contact in the wellbore wall, which can reduce the overall friction of the wellbore.Thereby reducing the lifting load of the equipment.
How to buy?
If you want to buy odex drill bit, you need to tell us the OD and the wall thickness of the casing you need. We also need to know the hole diameter, the Min. ID of the casing shoe, and the model of hammer.
In general, you need to choose the most suitable eccentric casing system according to the specific geological conditions, and also construction environment, economic budget and technical requirements to ensure the safe and efficient progress of the project.
If you need advice, please contact us: 
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.