Drilling mud desander is the second process equipment in solids control system. It is used to separate 45~74μm solids from drilling mud to ensure processed drilling mud will be further processed by next equipment .
Knowing common fault cause and correct solutions in desnader can make us use desander to purify drilling mud better.
1. Fault: discharge port bonding, liquid and solids bonding
Cause: solids overload
Solution: Reducing solids content and increasing the number of desander cyclones, check whether the shaker screen is damaged or not, check weather bypass of shale shaker is closed and reduce ROP.
2. Fault: the loss of liquids is too large
Cause:
A. The pressing head of supply liquid is too low:
a. Inlet blocked
b. There is air in the liquid supply pump
c. Pump speed is too slow
d. The size of impeller is too small
e. Pump discharge pipe with throttle
f. The rotation direction of pump is incorrect
g. Solid deposition in pipeline
B. The nozzles is too large
C. Inner cylinder or nozzle worn.
a. Work at a high pressure for long time
b. Normal wear
c. Incorrect installation for inlet
Solution:
A. Enhance pressure head of supply liquid.
a. Install a filter on inlet of pump
b. Increase impeller size
c. Check pipeline
d. Adjust rotation direction
e. Clean pipeline and install valve near to suction part.
3. Fault: Nozzles of desander cyclone nozzle are not able to jet liquids.
Cause: drilling mud is too dirty to lead to solids control equipment can’t work continuously. Drilling mud become dry in desnader or shaker screen was damaged.
Solution: Turn off equipment, clear the nozzle plug, open the upper flange to get rid of the blockage. Check shaker screen and adjust nozzles and try to start equipment. If the diesel engine drive, reduce the pump speed and size of the impeller, adjust the valve opening degree.
