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Overburden Casing System, also named Eccentric Casing System, is suitable for drilling water wells, geothermal wells, short mircopiles, medium mini-type grouting hole of building, and diamond harbour projects.
Economy: Eccentric is the most economical solution because its ingenious reaming wing and the bit is retrievable, allowing it to be used at the next hole.
When drilling, the reamer bit will rotate out to enlarge the hole which is enough for the casing tube to slide down behind the reamer. When the required depth is reached, the drill pipe will drill in the reverse direction and the reamer bit will retract, allowing the whole drilling system to pass through the casing.
| Part | PA90 | PA115 | PA140 | PA165 | PA190 |
|---|---|---|---|---|---|
| Casing Tube(max.O.D.)(mm) | 115 | 142 | 171 | 195 | 222 |
| Casing Tube (min.O.D.) (mm) | 102 | 128 | 155.6 | 182.6 | 205 |
| Guide Sleeve (Effective) | 174mm | 174mm | 205mm | 225mm | 250mm |
| DTH Hammer | DHD35, MISSION30 | DHD340, MISSION40 | DHD55, MISSION50 | DHD360, MISSION60 | DHD360, MISSION60 |
| Reaming Diameter | 123mm | 152mm | 185mm | 211mm | 237mm |
Different Shanks & Face Shapes:
Different Buttons Shapes & Drilling Process:
