Under-reaming System – PES
The Pneumec PES underreaming system is a two piece eccentric drilling system to drill and simultaneously case a hole through unstable ground conditions that are commonly known as overburden, and is especially effective for casing diameters from 114mm to 273mm. The eccentric pilot bit is retained inside the guide device by mean of a pair of interlocking lugs. When the system is rotated clockwise, the pilot bit opens up to drill a hole large enough to allow the casing to be pulled into the hole. After completing the hole, the eccentric bit is closed by reverse rotation and the drill string can then be retracted from the cased hole.
|
PES UNDERREAMERS’ CHOICES |
|
MODEL |
DRILLING DIA. |
RETRACTED DIA. |
CASING |
SHANK TYPE |
|
|
O.D. |
I.D. |
||||
| PES 90 | 125MM | 91MM | 114MM | 102MM | MACH33, DH3.5 |
| PES115 | 155MM | 116MM | 141MM | 126MM | SD4, DHD340, QL4 |
| PES140 | 188MM | 141MM | 168MM | 153MM | SD5, DHD350, QL5 |
| PES165 | 215MM | 166MM | 194MM | 181MM | SD6, DHD360, QL6 |
| PES190 | 238MM | 190MM | 219MM | 203MM | SD6, DHD360, QL6 |
| PES215 | 276MM | 215MM | 254MM | 240MM | SD6, DHD380, QL8 |
| PES235 | 293MM | 235MM | 273MM | 255MM | SD8, DHD380, QL8 |
| PES240 | 293MM | 240MM | 273MM | 260MM | SD8, DHD380, QL8 |
