Good suggestion on decanter centrifuge operation suggestion

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Decanting centrifuge operation and smooth operation suggestion
Decanting centrifuge in solids control is the 4th phase equipment. How to make sure its performance?
XI'AN, China - Oct. 20, 2016 - PRLog -- Decanting centrifuge use
A decanting centrifuge is a tool used in viscosity control and it is also solids-removal equipment. It is a
machine with an internal cylinder, or bowl, that rotates at high speeds (1800~3200 rpm). As drilling fluid is
pumped into and conveyed through the rotating bowl, it is subjected to a large centrifugal force that
increases the separation or settling rate of the suspended solids. The higher-mass particles separate fastest
along the wall of the rotating bowl.
An important distinction is that while screens and hydrocyclones are used to separate and discard larger
drilled-solids particles, centrifuges are used to separate and discard smaller, ultra-fine particles, both drilled
solids and barite.
Why use a centrifuge?
Short answer: To remove drilled solids.
During drilling operations, drilled solids accumulate and degrade in size, which causes viscosities and gel
strengths to increase, especially in weighted drilling fluids. These fluids necessarily contain concentrations
of weight material solids. A centrifuge will separate ultra-fine (less than 2 microns barite and 3 microns
drilled solids) from larger, desirable-size barite particles and drilled solids, which, while undesirable, are
not as harmful to fluid flow and wall building properties.
http://www.aipusolidcontrol.com/html/products/centrifuge....
Expensive treatment additives are also discarded with the ultra-fines stream. However, most chemical
treatment expense is directed to combat actions of ultra-fine drilled solids. While some additions will be
necessary, the ultimate result is lessened additive and barite usage, and the removal of drilled solids will be
beneficial.
Reduced viscosity of the fluid within the bowl with dilution enhances separation. Dilution fluid should be
added sufficient to maintain an effluent with a funnel viscosity between 35 and 37 seconds.
While centrifuging a water-based system, beneficial bentonite will be discarded along with drilled solids
and must be replaced. Usually one or two sacks of bentonite per hour of centrifuge operation over and
above normal treatment levels will benefit especially filtration and wall building characteristics. Centrifuge
adjustments, other than varying dilution fluid rate, are seldom needed and should be left to a centrifuge
mechanic. http://www.aipusolidcontrol.com/html/2016/solids-control-...
Decanting cenrifuge smooth operation reminders
1. Before startup, rotate bowl or cylinder by hand to make sure it rotates freely.
2. Start centrifuge first, before starting the drilling-fluid feed pump or dilution water.
3. Set drilling-fluid mud and dilution rates according to manufacturer's recommendations, which usually
vary according to mud weight.
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4. Shutdown:
. Turn off drilling fluid feed .
. Turn off dilution water
. Turn off machine
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Source Aipu solids control
Email Click to contact author
Phone 0086-18691483929
City/Town Xi'an
State/Province Shaanxi
Country China
Industry Environment
Tags Decanting Centrifuge, Solids Control.centrifuge, Centrifuge Decanter
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