The Operation Three Points of Desilter and Desander

 The comparison of umbrella excretion and the string excretion is to achieve the best solid removal, hydrocyclone underflow mouth should be umbrella shaped and with the air enter from the bottom inlet. Drilling fluid flow loss umbrella particles is proportional to the discharge of solid surface area.The removal of the high efficience for the inner wall and bottom outlet have wear light. The clusters of flow that drilling fluid and solid particles lost relative motion before reaching the mouth, underflow no air suction, low separation efficiency, wall and bottom outlet wear large, reach the underflow finer particles not from underflow and overflow from the outlet. Clusters of excretion than umbrella underflow density high underflow density. Efficiency but not with its density to measure the cyclone remove solids. The weight of solids removal should  be from the unit time to evaluate.
2.The underflow mouth sometimes blocked, which can be clear by adjusting the underflow The continuity of the blockage may be caused the first stage of solids control equipments can't work well, which leading to the solid content is too large. It can prior to increase the underflow and improve the efficiency of a solids control equipments.
3.Cyclone devices work in certain pressure of the water. General requirements 23~27m (75~90ft) head. The working pressure is hydrostatic head on the density of drilling fluid. Therefore, the drilling fluid density is higher, the working pressure should be greater. The head of 27m, pressure (MPa) =0.27 × drilling fluid density. In general, the centrifugal pump to maintain the 0.24~0.31MPa (35~45psi) pressure. Excessive pressure will accelerate the wear and influence the separation point.