1 Introduction to the structure of the cyclone sand remover and the principle of sand removal
Cyclone sand remover is a kind of mechanical separation equipment that uses centrifugal sedimentation principle to separate phases with different densities in heterogeneous mixtures. The basic structure of the cyclone sand remover is a separation cavity, an inlet and two outlets (see Figure 1). The separation cavity is mostly column-conical. The entrance is generally a tangential entrance. The outlets are mostly axial outlets, which are distributed at both ends of the cyclone sand remover. The overflow port is near the feed end, and the underflow port (sand discharge port) is far away from the feed end. The drilling fluid is injected into the cyclone sand remover from the tangential inlet through a mud pump, and rotates at high speed in the cyclone sand remover cavity, generating a centrifugal force field several thousand times the gravity field. Under the action of centrifugal force, the dense solid phase is thrown around, and moves downward along the wall, and is discharged from the underflow as an underflow; the drilling fluid with a low density is brought to the middle and moves upward, and finally overflows as overflow Outlet. In this way, the purpose of purifying drilling fluid is achieved by using a cyclone sand remover.
2 Internal mud flow pattern and secondary sand removal capacity
It can be known from the principle of sand removal that the mud performs spiral movement in the cyclone cavity. Under the influence of the structure of the sand remover, in the downward movement process, the movement direction is gradually changed, and finally an upward spiral around the center line is formed. The internal rotation fluid is discharged from the overflow port. Therefore, in the conical cavity of the sand remover, there are 2 reverse spiral flows (see Figure 2), ... Read More »