Desilter
Desilter is a solid removal equipment that uses Hydrocyclone principle for removing smaller solids from drilling fluid. It is placed after desander in sequence of fluid flow system on the rig. Drilling fluid is injected into desilter as a tangential flow. The centrifugal forces generated due to the movement of fluid through the hydrocyclone moves the solid particles outwards. The dispersed particles move downward in a spiral path into as underflow while the cleaner and lighter density liquid mud travels up through a vortex in the center of the hydrocyclone, exiting through piping at the top of the hydrocyclone. Desilter cones are 4-6 inche diameter to remove fine sands and silt particles down to 20 micron. Hydrocyclones are made of polyurethane because of its wear resistance and less weight than steel.