KOSUN DC Series Oilfield Drilling Fluids Decanter Centrifuge

Decanter centrifuge separation principle is to use high-speed rotating roller driven into the mud in the high speed rotating drum, mud was dumped into the wall to form a liquid circle, solid phased particles of liquid ring get greater than its own gravity for undreds or even thousands of times the effect of centrifugal force, will overcome the resistance of the slurry viscosity to the roller on the inner wall of rapid subsidence formed solid layer, liquid forming liquid layer.

The purpose of the decanter centrifuge as applied to a weighted water-base drilling mud is to control viscosity. This is accomplished by concentrating the colloidal-size and clay-size solids fraction into the effluent (liquid) steam and disposing of this phase. The economic justification of using the centrifuge on this type of system is the simultaneous return of weight material. Using a centrifuge on weighted water-based muds eliminates the expense of throwing away (jetting) whole mud to control viscosity. Water dilution and excess waste volume are minimized.

KOSUN DC series oilfield drilling fluids decanter centrifuge is used in drilling mud system for separating suspension of solids phase with particle diameter（d≥2μm） for drilling mud circulation and drilling fluids recycling. Ruggedly built for oilfield and industrial services, drilling mud centrifuge is especially effective in environmentally sensitive areas. It delivers high fluid-recovery rates and efficient solids control to significantly reduce the costs of makeup fluids and disposal. The oil drilling mud decanting centrifuge must test the dynamic balance for smooth operation over long periods. Speed ranging from 0 to 3900 RPM, generating centrifugal forces reach up to 3000G.

The centrifuge is driven by two motors, master one and auxiliary one, of which the former and the latter drives screw propeller. After the machine is started up, the drilling fluids treated by desilter will be pumped to the narrow end of rotary drum via screw pump which will further push it into propeller. Then it will be thrust into the inner side of rotary drum via the holes of screw propeller by the high-speed rotation. At this moment, the rotary drum and the screw propeller will generate a 35:1 differential rotational speed as well as a centrifugal field where the solid phase will be rapidly separated from suspension due to their density and size differences. Then, the separated solids will move along the blocks of screw propeller to the narrow end of rotary drum and discharge from the round holes while the treated suspension to the broad end of rotary drum and discharge from elliptical holes of straight cylinder.