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Underreamer D=200-250 mm
DTH underreamers are intended for increase diameter of a well in medium and hard grounds on previously drilled well with application of pneumatic impact tools. The tool consists of three parts: a guide arch along the drilled well diameter, an underreamer case, a shank for fastening to a pneumatic impact tool which can be produced with bayonet and slotted joint.| Name | Pneumatic impact tool | Type of connection with the pneumatic impact tool | Nominal diameter, mm | Length, mm | Weight, kg | |
|---|---|---|---|---|---|---|
| Underreamer d=200 mm | P-150C | slotted | 200 | 400 | 31,7 | |
| Underreamer d=220 mm | P-150C | slotted | 220 | 400 | 33,5 | |
| Underreamer d=250 mm | P-150C | slotted | 250 | 400 | 35,0 |
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