Decanter centrifuge use in solid separation for drilling fluid after desilter, which done by the 4 inch hydrocyclone The drilling mud at this stage may contain solids between 2 to 5 micron and in some case, it contain the barite, the reusable additive. Decanter centrifuge ‘s purpose is separate this fine solids and recover the barite to achieve purification of drilling mud so it can be sent it back to rig and use it for drilling many times over.
The basic concept of decanter centrifuge is use G-force rotate the bowl “spinning” to create the weight difference so the solids is separate from the mud. During the high speed spinning in G-force, the solids move in one direction while the mud moves to opposite direction to achieve the separation and two exits below the decanter centrifuge will be one for exit of solid while the other one is for the mud that is done separation. The centrifuge generate centrifugal force amount to 400g~3000g acceleration, only need a short time accomplish the separation process
Such process is accomplish by feeding the drilling mud after the separation of desilter and feed the mud into the decanter centrifuge. Decanter centrifuge mainly use for recovering the barite and get rid of small solids in the mud for reduce the solids in the drilling mud. This step to make sure the function of drilling mud back to near as new as possible, which the drilling rig bit need for continues drilling.
Drilling rig need this cleaning step is purposely maintains the cost of the drilling. The maintains of drilling cost is by product. The main reason is if solids separation is not done properly, the density of small solids will raise and that will seriously affect the drilling bit which will cost raise temperature in the mud and cost damage of the drilling bit and many other types of machinery to over worked and lead to structure damage of the drill rig.