As a solids control equipment of the second stage in drilling operation, desander is used to remove harmful solid particles of 40-74µm in drilling liquid. Suspending particles can be separated from the liquid under the centrifugal acceleration, by use of working principle of centrifugal subsidence.
At present time, six types,JZQJ300×2,JZQJ250×2, JZQJ200×2 and JZQJ300×1, JZQJ250×1, JZQJ200×1are available. The former applies to over 3000-meter-long drills, and the latter applies to small drills of less than 3000 meters and service rig.
1. ZQJ Double Hydrocyclone Desander 
Main Technical Parameter：
| Model | JZQJ300×2 | JZQJ250×2 | JZQJ200×2 |
| Hydrocyclone diameter | 300mm | 250mm | 200mm |
| Working pressure | 0.2～0.45MPa | 0.2～0.45MPa | 0.2～0.45MPa |
| Capacity | 240 m3/h | 200 m3/h | 160 m3/h |
| Screen size | 1240×585 mm | 1240×585 mm | 1240×585 mm |
| Screen spec | 120-200 目 | 120-200 目 | 120-200 目 |
| Inlet diameter | 6″ | 6″ | 3″ |
| Outlet diameter | 8″ | 8″ | 6″ |
| Motor power | 0.5 kW | 0.5 kW | 0.5 kW |
| Weight | 780 kg | 740 kg | 700 kg |
| Overall dimensions | 1630×2018×2280mm | 1630×2018×2215mm | 1630×1875×2045mm |
2. ZQJ Single Hydrocyclone Desander
Main Technical Parameter：
| Model | JZQJ300×1 | JZQJ250×1 | JZQJ200×1 |
| Hydrocyclone diameter | 300mm | 250mm | 200mm |
| Working pressure | 0.2～0.45MPa | 0.2～0.45MPa | 0.2～0.45MPa |
| Capacity | 120m3/h | 100m3/h | 80m3/h |
| Screen size | 1240×585 mm | 1240×585 mm | 1240×585 mm |
| Screen spec | 120-200 mesh | 120-200 mesh | 120-200 mesh |
| Inlet diameter | 6″ | 6″ | 3″ |
| Outlet diameter | 8″ | 8″ | 6″ |
| Motor power | 0.5 kW | 0.5 kW | 0.5 kW |
| Weight | 680kg | 640kg | 620kg |
| Overall dimensions | 1630×2018×2280mm | 1630×2018×2215mm | 1630×1875×2045mm |
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