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.
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.
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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