Figure 8-1 is a common structure diagram of hydrocyclone. Its upper is a cylindrical shell, the lower is a conical shell and the side of the cylindrical shell is drilling fluid inlet pipe. The top of hydrocyclone is equipped with outlet overflow pipe. The bottom of the cylindrical shell is a sand hole, from which the separated sand, mud, and a small amount of liquid are excluded.
The nominal diameter of hydrocyclone size refers to the inside diameter of upper cylindrical volute. Depending on the inside diameter of the hydrocyclone,it is divided into desander, desilter and miniature cyclone . So far, there is no strict classification criteria about hydrocyclone. When the hydrocyclone is used to deal with sand grains more then 74um in API, it is called desander. When cylinder diameter is greater than or equal to 150mm, the hydrocyclone are named desander. According to the GB/T11647-89 recommended,the classification standards and the corresponding separation size of hydrocyclone are as shown in table 8-1.
The classification standards and the corresponding separation size of hydrocyclone
|
Specification D,(mm）
|
300
|
250
|
250
|
150
|
125
|
100
|
50
|
|
Name
|
Desander
|
Desilter
|
Microclone
|
|
Cone α(°)
|
20-35
|
20
|
10
|
|
Capacity (m3/h)
|
120
|
100
|
30
|
20
|
15
|
10
|
5
|
|
separation size (μm)
|
44-74
|
15-44
|
5-10
|
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