Desander

Desander equipment in solids control system

A desander is the second phase cleaning for a whole solids control system, It sit on mud tank for separate drilling cuttings 47-76 micron and above by centrifugal force. The untreated mud will feed into desander cone at the horizontal inlet at pressure, the pressure and weight will help solids particles moving beside cone wall and drop down, fluids particles will be press on top and over flow away through pipeline. There can be a shaker to collect solids particles from desander nozzle or drop onto a hoper directly.

Application of drilling fluid sand desander 

Secondary solid control treatment of mud and fluid to be treated in oil and gas drilling, coal bed methane excavation, trenchless directional crossing, pile driving, waste sewage, mud treatment, etc.In short, it is suitable for a variety of environments of mud and solid liquid mixture desanding treatment.The general excluded particle size is bigger than 45 microns.

Structure components of drilling fluid desander

It mainly includes base, frame, motor, control cabinet, cyclone group, corresponding pipeline, shale shaker screen, fixed screen device. Some customers require that the desander should not be equipped with a bottom flow shale shaker and only require a desander without downstream shale shaker, such structural components do not include the motor, control cabinet , shale shaker screen and fixed screen device.

For oil drilling mud process, desander cone is sized 8-12''. Different size cones hold different treating capacity. Before we confirm the configuration or design on mud desander, we should consider the flow rate of all cones. For example, 10" cone capacity is about 90-120m3/h and we request 240m3/h flow rate then we need 2 desander cones at least.

Cones on APCS Desanders are all high quality polyurethane. Such cones are durable and anti-corrosive, oil-resistant, high temperature-resistant. They are very suitable for drilling fluids process. For some clients, they prefer flexible capacity adjustment during operation so we'll install ball valves on the cones inlet line. And we can configure 3 desander cone sized 10'', or 2 desander cons sized 12''. For much larger capacity, we can use 3 desander cone sized 12''. Moreover, some clients prefer the casting iron desander cone. According to the actual demand and condition, we'll make desander to satisfy both clients and working condition.

For desander separator, the bottom shaker is a flexible configuration, too. It can be Hunter-D series, or Hunter-M, or Hunter-Mini. And the screen panels can be 2, 3, or 4, even 5. For some clients' preference on dual motion, it can be made as dual motion desander, too.

Actually, the bottom shaker under desander cone is used to dry fluids out of cone. So, the mesh size is rather high and the capacity is enough for discharge from cone but not same as previous shaker

Safe operation of drilling fluid desander

Before using the equipment, make sure the pressure gauge reading is within the safe range.Before use, confirm the seal status of inlet/outlet and manifold connections.
Maintenance of drilling fluid desander:
1. In the process of use, pay attention to check whether the pressure gauge is normal;
2. Sealing inspection should also be done at the inlet and outlet and manifold joints;
3. If there is a bottom flow screen to pay attention to the use of the state of the screen and wear degree;
4. Pay attention to cleaning to ensure the service life of equipment

Matters needing attention for drilling fluid desander

1. When you feel that the force of the liquid sprayed by the trickle nozzle of the cyclone is not enough, please check whether the equipment has leaked parts or whether the pressure is sufficient;
2. If the efficiency of desander is reduced, it may also be that the flow of slurry pump is not enough, please consider adjusting the pump set;
3. The desander does not pulp out, which may be blocked by the drip nozzle. Please unscrew the drip nozzle cover and dredge it, then it can be restored to normal

Technical specification for your reference.