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Drilling fluid Waste Management System procedure

2013-05-27
The well-drilling process generates two types of wastes -- used drilling fluids and drill cuttings.  Most onshore wells are drilled with water-based or oil-based muds, while offshore wells may also use synthetic-based muds. 
The first step in separating the cuttings from the mud involves circulating the mixture of mud and cuttings over vibrating screens called shale shakers.

Drilling fluid Waste Management System procedure shale shaker 
Shale shaker 
Often two series of shale shakers are used. The first series (primary shakers) use coarse screens to remove only the larger cuttings. The second series (secondary shakers) use fine mesh screens to remove much smaller particles. In general, the separated drill cuttings are coated with a large quantity of drilling mud roughly equal in volume to the cuttings.


Drilling fluid Waste Management System procedure mud tank 

Mud tank


Drilling fluid Waste Management System procedure vertical cutting dryer 

Vertical cutting dryer 
Additional mechanical processing is often used in the mud pit system to further remove as many fine solids as possible because these particles tend to interfere with drilling performance. 

Drilling fluid Waste Management System procedure centrifuge 
Centrifuge
the solids can be further treated with drying shakers utilizing high gravitational separation, vertical or horizontal rotary cuttings dryers, screw-type squeeze presses, or centrifuges. The cuttings dryers recover additional mud and produce dry, powdery cuttings.