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Basic theory of drilling fluid solid liquid separation

2013-05-28
Solid control equipment drilling fluid treatment subside theory;
In petroleum drilling solid control system, the continuous operation solid liquid separation equipment can be the gravity precipitate, also can be the centrifugal precipitate. The gravity precipitate equipment is including the hydrocyclone desander. 


When solid and liquid exist the density difference, can use centrifugal precipitate method to realize solid liquid separation. In centrifugal force field, when particles is overweight liquid, centrifugal force will make it move outward along the radial; when particles is light liquid, centrifugal force will make it move entad along the radial. So centrifugal sedimentation can be as a kind of extend of fine particles gravity sedimentation, and also can separate the steady dirty solution in gravity field. 


Any separation process theory all depend on the two kinds of combination whether have relative movement, so maybe exist two types possibility. 
A Solid precipitated through fluid bed.
B Liquid filtrated through solid bed. 
The continuous operation equipment use movement typeA main have subsider and defecator, spiral unload sediment centrifuge and hydrocyclone. 
The operation equipment use movement type B main have continuous filter and the opened hole basket centrifuge on drum.