Dewatering is the process of removing of colloidal size solids by the addition of chemicals to coagulate or flocculate the solids in the mud thus chemically enhanced fluid is pumped to the centrifuge.
Without the dewatering process, the mechanical solids separation capability is limited to 2-4 microns. Thus dewatering overcomes this limitation by “flocculation” of the feed mud by pre treating the feed of the centrifuge to increase the” effective particle size” of the suspended solids.
Coagulation is the addition of chemicals to drilling mud, causing the colloidal particles within the liquid phase to stick or bond together when contact is made. This is resulting in particle sizes > 5 microns. Mixing is utilized during the coagulation to provide a rapid and uniform dispersion of the chemicals. Usually, the entire process occurs in less than a second.
Effective use of a DFE dewatering system can reduce disposal costs by more than 50%.
For more info please click on the PDF links and images below.