The desander removes sand size particles and larger drilled solids, which have passed through the shale shaker screen. These solids are discarded along with some liquid into the waste pit. The clean mud is then discharged into the next pit ready to be run through the desilter.
Desander
What is the benefits of desander as second stage solids control equipment?
KOSUN desander is used as the 2nd stage of solids control for drilling mud, which makes separations between 45 and 75 microns.
1. Polyurethane(PU) Material or high-chromium cast iron for desander cones with longer using life.
2. Clamp type for easy maintenance.
3. Compact design with small footprint.
4. Flexible options for 1, 2 or 3 for different capacities.
5. Flexible fast connection is available for user assembly.
Desanders have no moving parts. The larger the internal diameter of the desander is, the greater the amount of drilling fluids it is able to process and the larger the size of the solids removed. A desander with a (10 inches (250 mm) cone) is able to remove 50% of solids within the 45-74 μm (micrometre) range at a flow rate of 500 US gallons per minute (32 L/s), while a desilter (4 inches (100 mm) Cone) is able to remove 50% of solids within the 15-44 μm range at a flow rate of 60 US gallons per minute (3.8 L/s). Micro-fine separators are able to remove 50% of solids within the 10-15 μm range at a flow rate of 15 US gallons per minute (0.95 L/s). A desander is typically positioned next-to-last in the arrangement of solids control equipment, with a decanter centrifuge as the subsequent processing unit. Desanders are preceded by gas busters, gumbo removal equipment (if utilized),shale shaker, mud cleaner (if utilized) and a vacuum degasser. Desanders are widely used in oilfield drilling. Practice has proved that hydrocyclone desander is a kind equipment of economic and effective.
Generally, KOSUN desander possesses 1～3 hydrocyclones by cast iron, desilter has 8～16 hydrocyclones by polyurethane, polypropylene, or other types. It can depend on the requirement of clients.
Hydrocyclone
A hydrocyclone (often referred to the shortened form cyclone) is a device to classify, separate or sort particles in a liquid suspension based on the ratio of their centripetal force to fluid resistance. This ratio is high for dense (where separation by density is required) and coarse (where separation by size is required) particles, and low for light and fine particles. Hydrocyclones also find application in the separation of liquids of different densities.
