Common faults of solid control system laying plan

drilling fluid is discharged to the upstream tank of suction mud tank.

The fault is the layout of desander and desilter,
desander and desilter dispose about 50% of
returning drilling fluid. There are about 50% drilling fluid bypass desander
and desilter.

layout of desander suction inlet and overflow are in the same tank

Fault layout of desander and desilter. If
the agitating in the tank is very bad, drilling fluid maybe completely bypass
solid control equipment, it shapes a minor loop, the processing ratio is zero.

pump absorb drilling fluids from desilting tank

The function of desilting is sediment
solid phase is not to be as suction mud tank. If don’t has solid phase
desilting. Drilling fluid flows into the nest tank. Because the number of
solids phase is increase, vacuum degasser and desander
will be blocked and lose their functions, the load of coarse solid phase
particles will be greater.

It intensifies wearing of centrifugal
pump. if stop pump in drilling working, solid phase particles will buries the
suction mud inlet of centrifugal pump, it may be damaged by gas invade or solid
phase particles blocking, because the capacity of desander is bigger than
circular flow of drilling rig, the liquid level will decrease in desilting
tank, at last gas enter into the suction inlet of pump make the operation of
hycrocyclone is badness.

and desilter are connected to mud gun line pipe.

Usually, agitator mud pipe absorb mud from the
downstream of vacuum degasser and desilter. If desander and desilter are connected to agitator gun pipeline, in this
condition, the capacity ratio is 40%, desilter is 26%. So there are 40%
drilling fluid in the well are not disposed by desander, 74% are not disposed
by desilter. So there are 74% drilling fluid bypass the desilter.