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Characteristics and common types of drilling fluid decanter centrifuges

Feb 06, 2019

The drilling fluid decanter centrifuge is used to separate the separation of ultra-fine solid phase particles in the drilling fluid. It has a large aspect ratio and high separation factor, ensuring that the ultrafine particles in the drilling fluid are fully settled; the contact between the drum and the material is made of high quality stainless steel. It has strong corrosion resistance; the inner spiral is made of suspension structure and embedded with hard alloy sheet, which has large processing capacity and high abrasion resistance; the explosion-proof grade of electrical parts reaches DIIBT4 explosion-proof grade.

 

The drilling fluid decanter centrifuge can be divided into three types according to the separation factor. One is a low-speed centrifuge, and the separation factor is 500-700. For the low-density solid phase, its separation point is 6-10 μm. High-density solid phase with a separation point of 4 to 7 μm. This centrifuge is mainly used to recover barite.

 

The other is a medium-speed centrifuge with a separation factor of about 800. It can separate 5-7 μm solid phase, which is used to remove the harmful solid phase in the mud and control the specific gravity and viscosity of the mud. This is the most used by the well team. Centrifuge. There is also a high-speed centrifuge, which has a separation factor of about 1200 to 2100 and a separation point of 2 to 5 μm. It is used to remove harmful solid phases and control mud viscosity. It is generally used in series with a low-speed centrifuge to form a two-machine system.

 

In this system, the low-speed centrifuge is placed in the first stage, and the separated barite is discharged back into the mud tank to recover the barite. The discharged liquid is first discharged into a buffer tank, and then the buffer tank is pumped. The liquid in the liquid is sent to the high-speed centrifuge. The solid separated by the high-speed centrifuge is discharged outside the tank, and the liquid is returned to the circulation system. The "two-machine" system can effectively remove the harmful solid phase and prevent a large amount of wasted barite. It has been widely adopted in foreign countries, and this system has also been installed in China.

 

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