Common faults of solid control system laying plan2012-12-29
Disposed 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.
The 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.
Centrifugal 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.
Desander 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.