Hydrocyclone is usually installed on the drilling mud desilter, desander and mud cleaner in oilfield drilling mud cleaning system. It is the most important component for them.

When hydrocyclone is working, high-speed swirling movement generates the air column and low-pressure area, creating suction towards underflow outlet. Inject some water into hydrocyclone at certain pressure and adjust the outlet till it allows no fluid flow, meaning it reaches the balance point. This hydrocyclone is called balanced hydrocyclone, often found in drilling fluids cleaners where solid-content fluids enters and solids leave through underflow outlet.
 

However, some problems may arise when adjusting the underflow outlet:

1. “Dry Underflow”: Relatively smaller outlet can pile a layer of dry silt between it and the balanced point. When ultra-fine solids enter, its water goes through the layer and dewatered solids block the outlet, causing dry plug. And this is called “dry underflow” adjustment.

2. “Wet Underflow”: Relatively larger underflow outlet can discharge conical rotating liquid. And this is called “wet underflow”.

3. “Radial” Discharge: Commonly, two flows move mutually reversely at the apex, one is the air inhaled and another the solid-content slurry discharging radially, forming an annular curtain there. Inhaled air keeps the outlet open and the cyclone efficient.

4. “Rope-like Discharge”: When the solid content excessively exceeds the designed capacity, the hydrocyclone is over-loaded and solids flow out outlet in a rope-like shape, making no air or annular curtain but a nozzle possible. Then, some solid phase within limits will turn around and out from vortex finder.

KOSUN is the professional and leader in China oil drilling solids control industry with abundant experience, we can manufacture all the oil and gas drilling fluid purification equipments with abundant experience, the solids control equipment we can provide include drilling shale shaker, shale shaker screen, desander, desilter, vacuum degasser, centrifugal pump, submersible slurry pump, shear pump, mud agitator, mud gun, drilling fluid mud cleaner, decanter centrifuge, jet mud mixer, mud tank, diesel tank, water tank, complete drilling mud cleaning system, various products' accessories, etc.