Drilling fluid cleaning system BDCMS-200K

Drilling fluid treatment process

Drilling fluid loaded with cuttings from the mud pit no. 1 is pumped into the buffer tank no. 2 by an external pump. 

It is then directed from tank no. 2 onto the bottom screens of the shale shaker  no. 3 to separate the coarser material. Large cuttings particles are removed from the system, while the fluid with fine cuttings passes through the bottom screen deck and flows into the main fluid tank no. 4.

The drilling fluid with fine cuttings held  in tank no. 4 is then fed by the mud pump no. 5 to the inlet of the hydrocyclone(s) no. 6. After the particles are spun off and separated in the hydrocyclones (desilters/desanders)  no. 6, the cuttings  are removed through the bottom outlet of the hydrocyclone and fall  onto the top screen deck  of the shale shaker no. 3, where they are dried and discharged outside. The fluid cleaned  in this way overflows through the top outlet of hydrocyclone no. 3 back into the buffer tank  no. 2.

When the fluid level in the  main tank no. 4 drops below the safe  float level, the fluid inlet  opens and clean fluid flows into tank no. 4, creating a closed circuit. When the drilling fluid level  reaches the designed height, the fluid inlet  closes and clean fluid overflows through the top outlet of the buffer tank  no. 2 into the clean fluid storage tank on site.

If a large amount of cuttings  accumulates at the bottom of the fluid buffer tank no. 2, a valve can be switched to open the flushing line no. 7. In that case the fluid  is sprayed through flushing nozzles, causing circulation and mixing, which makes it possible to clean the sediment inside the buffer tank.