Desander and Desilter's difference

Desander and Desilter's difference

The diameter of the hydrocyclone's upper parts is the important factor which decide the hydrocyclone's treating capacity and separation size. The diameter of the cylinder is called the nominal size of the cyclone. The lower cone part's angle is between 15-20 degrees. The diameter of underflow mouth is 10-30 mm. Generally, a group of hydrocyclones which nominal size is 150-300mm, is called Desander. And a group of hydrocyclones which nominal size is 50-125mm, is called Desilter.

(1) Hydrocyclone desander

According to the treating capacity required, the desander has one to three hydrocyclones. Each hydrocyclone's treating capacity is no less than 20-120m3/h under the pressure of 0.2 Mpa. The normal working hydrocyclones can remove 95% of particles bigger than 74 micron meters and 50% of particles bigger than 40 micron meters. In order to improve the using efficiency, in choosing the hydrocyclones, the treating capacity must be 125% of whole drilling capacity.

(2) Hydrocyclone desilter

According to the treating capacity required, the desilter has more than 4 pieces of hydrocyclones. Each hydrocyclone's treating capacity is no less than 5-15m3/h under the pressure of 0.2 Mpa. The normal working hydrocyclones can remove 95% of particles bigger than 40 micron meters and 50% of particles bigger than 15 micron meters. The desilter can remove 12-13 micron meters' barites. So the desilter can not be used in treating heavier drilling fluid. In choosing the desilter, the treating capacity must be 125%-150% of whole drilling fluid capacity.

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Desander and Desilter's Working Principle

Desander and Desilter's working principle

Hydrocyclone desander and hydrocyclone desilter is the second and third grade cleaning equipment in the whole solids control system. It is combined with inlet pipes, discharge pipes, one group of hydrocyclones, cleaning shaker, bottom base and support parts. Like the following photo show.

1- Motor, 2-Bottom base, 3-Support parts, 4-Hydrocyclones, 5, Sand discharge pool, 6-cleaning shaker

The hydrocyclone's working principle is as below show:

The Hydrocyclone is combined with upper shell, lower shell and underflow mouth. The upper shell is cylindrical type, then forming an inlet. There is an inlet pipe on the side and a vortex tube on the top of center, then forming an overflow mouth. The lower shell is conical and has a general cone Angle for 15-20 degrees. The bottom is underflow mouth, the solids is discharged from this mouth.

When the drilling fluid which contain a certain flow rate and pressure through into the hydrocyclone from inlet mouth's tangential direction and swivel in a high speed, under the centrifugal force, the heavy solids in the drilling fluid was thrown off to the inner shell of hydrocyclones and down, finally discharged from underflow mouth. The lighter solids and drilling fluid form a upper vortex, and then discharged from overflow mouth. 

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Email: alisa@jxsolidscontrol.com