What are the characteristics of the desander in the solids control system

A desander is used in the drilling solids control system. The desander is mainly used to separate solid particles with a particle size of 47-76μm in the drilling fluid. So what characteristics does it need to have? Today we will talk about it.

Desanders are located after the drilling fluid shaker and before the centrifuge in the solids control process. Their main purpose is to remove the finer solid phase particles that are mixed in the drilling fluid after being filtered by the drilling fluid shaker. The core component of the mud cleaner is the hydrocyclone, which is a solid-liquid separation device designed according to the principle of centrifugal sedimentation separation. Its ability to separate the solid phase is related to its own structural parameters, slurry feeding pressure and drilling fluid characteristics. The curve of the hydrocyclone for the treatment of solid particles is relatively flat. Even if a small diameter cyclone is used, it is difficult to remove large diameter solid particles, which is why the cyclone cannot replace the drilling fluid vibrating screen or centrifuge.

Features of desander 

1. The structure is relatively simple, the cost is low, and it is easy to install and operate. It has a large processing capacity, a small footprint, a wide range of uses, strong adaptability, no power, and maintenance-free operation.

2. Compared with mechanical decontamination devices, expansion pipes, buffer boxes and other sand removal equipment, it has the advantages of small size, large processing capacity, low investment and operating costs. The position of the inner wall of the equipment facing the water inlet is provided with a swirl shield and a deflector, which is conducive to the formation of swirl; strong impact resistance and prolongs the service life of the equipment.

3. The wall of the cyclone chamber and the sedimentation chamber is equipped with a guide plate, which is conducive to the formation of cyclone sedimentation, so that the impurities can enter the sewage collector as soon as possible, and the sewage collector prevents the impurities from turning over when the system pressure suddenly increases and the water flow increases. It still maintains a good precipitation effect.

4. The lower part of the water outlet is equipped with a stainless steel filter screen and a water blocking ring. The filter screen disperses the water flow, slows down the flow rate, and further retains the suspended impurities in the water; the water flow forms a stable rotating water layer under the filter screen, and the suspended impurities gradually gather around. Under the water blocking ring, it gathers into loose small groups, and enters the dirt collector along the inner wall under the action of the deflector.

5. Description: Because the fast rotating water flow has a strong cleaning ability on the filter screen, it will not be blocked during continuous operation. If the system is not cleaned for the first time or is out of service for a long time, the impurities that can be adhered to the filter screen are difficult to wash away. At this time, the water inlet must be opened to remove the impurities.