Types and principle of decanter centrifuge

Drilling mud decanter centrifuge is the fourth stage equipment for adrilling mud system. Drilling mud cleaning first stage uses drilling fluids shale shaker ,then second stage uses desander, third desilter, (now drilling mud cleaner is widely used to replace desander, desilter).
The drilling mud decanter centrifuges can separate fine particles well, for separating 5～7μm particles in drilling mud, usually use medium speed decanter centrifuge, for less then 2μm, usually use high speed decanter centrifuges.

Decanter centrifuge working principle
Decanter centrifuge is driven by two motors. The main motor drives the drum and the outer casing of differential through belts while the auxiliary motor, after the differential shifting speed, drives the spiral propeller. This will make the drum and the spiral propeller rotate in the same direction with a certain differential speed.

Decanter centrifuge types
Usually decanter centrifuge is divided into middle speed centrifuge and high speed centrifuge.
In oilfield, middle speed centrifuge is used to recycle the barite and bentonite in solids control system, high speed decanter centrifuge could separate the fine solids in drilling mud after the desilter unit.
Meanwhile, high speed centrifuge centrifuge is always applied in drilling waste management to recover the valuable drilling fluids.