Decanter centrifuge is used as the 4th phase solids control equipment after shaker, desander and desilter. The drilling centrifuge suck the mud from the compartment receiving the discharge from the desilter and mud cleaners, and the returned stream is directed to the next compartment downstream.

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The use of decanter centrifuge with the drilling mud:

1. Removal fine solids from unweighted fluids

2. Selection separation of colloidal and ultra-fine solids from weighted fluids to improve their flow properties.

The use of oilfield decanter centrifuge with unweighted drilling fluids

DC series decanting centrifuge is specially designed for the drilling mud solids control. The effective centrifuging and fine drilled solids separation can remove significant quantities of inseparable solids. This significantly reduces the tranditional dilution requirements and drilling waste volume for disposal.

When drilling decanter centrifuge the unweighted drilling mud, keep in mind the following:

Operate a centrifuge with high G force as the solids loads are low

Adjust the weir to a deep pool to maximized solids separation

Control a smaller mud feed rate to increase residence time

Operate centrifuges in parallel, not in series if multiple centrifuges are required.

The use of decanting centrifuges with weighted drilling fluids

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With the unavoidably higher solids content of weighted muds, the increase of gel strengths and viscosities, as well as the degradation of filter cake quality associated with the diminution of particle size with time, can become a serious problem. The problem is caused by the increasing concentration of colloidal and near-colloidal particles that are too fine to be separated from the base fluid. Drilling fluids decanter centrifuge is used to selectively remove these fine solids.