•As with hydroclones, decanting-type centrifuges increase the forces causing separation of the solids by increasing centrifugal force.
•The decanting centrifuge consists of a conical, horizontal steel bowl rotating at a high speed, with a screw-shaped conveyor inside.
–This conveyor rotates in the same direction as the outer bowl, but at a slightly slower speed.
–The high rotating speed forces the solids to the inside wall of the bowl and the conveyor pushes them to the end for discharge.
•Centrifuges are capable of making a sharp cut point.
–The ideal cut point is the particle size at which all larger particles are separated and all finer particles are retained.
–This is, however, not possible, so the actual stated percent of cutpoint(D number) should be included when comparing centrifuge performance characteristics.
Solids Control –Centrifuges Discharge
Solids Control –Centrifuges -Applications
Solids Control –Centrifuges -Applications
•Weighted mud
–Dual centrifuges can be rigged up for barite recovery.
–The first centrifuge recovers barite and send it back to the mud system.
–The overflow is sent to the second machine to remove LGS and send clean mud back to the mud system
•Un-Weighted mud
–Centrifuges set up in a parallel configuration, both remove low gravity solids and send cleaned fluid back to the mud system
•De-watering
–Whole mud is treated to form dry solids for disposal and clear water for recycling.
–For this application, the solids content of the mud is brought to a very low level.
–Then, chemicals are added to encourage the particles to coagulate and flocculate.
–Once the fluid is properly treated, it can be processed through a centrifuge, with mostly dry solids and water being recovered
•Reduction of mud costs, without sacrificing control of essential mud properties, is the main purpose of, and justification for, using a decanting centrifuge.
•Although it helps control undesirable fine solids, the centrifuge’s principal function is to minimize dilution and maintain acceptable properties in the mud system
Solids Control –Centrifuges –Internal Parts–Dual centrifuges can be rigged up for barite recovery.
–The first centrifuge recovers barite and send it back to the mud system.
–The overflow is sent to the second machine to remove LGS and send clean mud back to the mud system
•Un-Weighted mud
–Centrifuges set up in a parallel configuration, both remove low gravity solids and send cleaned fluid back to the mud system
•De-watering
–Whole mud is treated to form dry solids for disposal and clear water for recycling.
–For this application, the solids content of the mud is brought to a very low level.
–Then, chemicals are added to encourage the particles to coagulate and flocculate.
–Once the fluid is properly treated, it can be processed through a centrifuge, with mostly dry solids and water being recovered
•Reduction of mud costs, without sacrificing control of essential mud properties, is the main purpose of, and justification for, using a decanting centrifuge.
•Although it helps control undesirable fine solids, the centrifuge’s principal function is to minimize dilution and maintain acceptable properties in the mud system
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