After the oil-based mud returns from the well through the vibrating screen, the mud liquid phase enters the circulation system for continued treatment and use, the mud solid phase enters the filter dryer (filter separator) rock chip dryer through the screw conveyor, after the filter dryer separation, the mud solid phase is taken into the rock chip box by the screw push, the mud liquid phase flows into the liquid storage tank is pumped into the vertical centrifuge for secondary treatment. The liquid phase of the mud enters the circulation system, and the solid phase of the mud is pumped into the cuttings box through the screw pump.
In the secondary treatment, the selection of a centrifugal separator must be based on the size and concentration of solid particles in the suspension, the density difference between the solid and the liquid, the viscosity of the liquid, the characteristics of the filter slag, and the separation requirements for a comprehensive analysis, the initial selection of which type of centrifugal separator. Generally, for suspensions containing particles with a particle size greater than 0.01mm (the maximum screen mesh number for the platform is 320 mesh, and the particle size is about 0.044mm), filter centrifuges can be selected; For fine particles or compressible deformation in suspension, sedimentation centrifuge should be chosen; This is also the basis for determining the position of the drill chip dryer and centrifuge in the process. At the same time, due to the suspension of compressible deformable filter slag, under a certain separation factor, the gap between the filter slag layer and the filter medium will be blocked, and the centrifuge-treated cuttings can not pass through the cuttings dryer again.