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Solids removal on the rig is accomplished by the following techniques: shale shakers, desander , desilter, centrifuge. Each device is designed to remove a sufficient quantity and size range of solids. Often these are accomplished using separate devices, but sometimes these processes are combined, as in the case of the mud cleaner, which is a bank of hydrocyclones mounted over a vibrating screen. Another important hybrid device is the cuttings dryer, which is a centrifuge fitted with a cone-shaped shaker. Additional devices can help enhance solids-removal efficiency. For example, a vacuum degasser is sometimes installed (before any centrifugal pumps, typically between the shakers and desanders) to remove entrained air that can security hazard and reduction in mud density.

The performance and quality of solids control equipment is the key to solids-control technology. The solid control system consists mainly of three major parts including mud circulating tanks, electric control equipment and mud cleaning equipment in which shale shaker, desander, desilter, vacuum degasser, decanter centrifuge, centrifugal pump, mud agitator and jet mud mixer are mainly involved, in addition, for environmentally-sensitive areas, cutting recovery and drilling waste management equipment should be installed for environment protection.

A whole solids control method shall incorporates shale shaker, vacuum degasser, desander, desilter, decanter centrifuge, mud agitator, mud gun, mud tanks. Etc. You could find that the largest consumed power is generated from desander and desilter. Because it required significant horse power centrifugal pump for feeding the desander cones & desilter cones to reach proper working performance with certain feeding pressure. It generally require 55kw/75kw centrifugal pump.

With more and more attention on environmental protection and energy saving, the solids control service company now are trying to by pass the desander & desilter. But how to do that ?

Firstly, significant treating capacity shale shaker is needed with high mesh/API shaker screen. Thus, about 30 to 59 microns particles can be removed.
Secondly, huge treating capacity decanter centrifuge is needed. The is the last treating step of the mud to cut mud weight or recovery barite.

Consequently, only 2 phase solids control equipment is enough for the drilling. For this kind of new try, professional solids control engineer and mud engineer is required. If this design become successful and proof to be more efficient, a new generation will come for solids manage equipment manufacturer or solids manage service company.