Due to the movement track, working parameters (amplitude, frequency, screen inclination, etc.), drilling fluid properties, particle wet-dry degree, particle shape (single particle, particle group), solid particles on the screen surface will form relatively static, forward sliding, reverse sliding, throwing motion and other forms of motion:
Relatively stationary, particles and particles maintain contact with the screen surface and move with the screen surface without relative movement.
In the forward sliding, the particles and particles remain in contact with the screen surface, while moving in the direction of the discharge direction relative to the screen face.
In reverse sliding, the particles and particles remain in contact with the screen surface and move in the direction of the reverse discharge of the screen surface.
In the throwing motion, particles and particles are thrown away from the screen surface and make a parabolic movement toward the discharge direction.
It should be pointed out that in order to make the drilling fluid shale shaker have both a larger capacity and a higher chip removal speed, solid particles should be thrown on the screen surface. Throwing motion can not only effectively improve the particle migration speed, but also effectively promote solid-liquid separation. In the process of throwing, the particles are transported to the discharge outlet, and the contact time and times with the screen surface are less, which greatly reduces the sifting penetration rate of small particles. However, it should be noted that the acceleration of the screen surface cannot be too large, as long as the solid particles can overcome the adhesion resistance between it and the drilling fluid and separate, the drilling fluid can be smoothly screened. Excessive normal phase acceleration will increase the impact of particles on the screen when falling, resulting in more chances for small particles to pass through the screen. Or due to the collision energy is too large, resulting in the crushing of large particles, so that the amount of sifting particles increases, but affects the removal of the solid phase. At the same time, the excessive normal phase acceleration also puts forward higher requirements for the strength of the vibrating screen. For a certain length of the screen, the fewer times the particles bounce on the screen surface, the shorter the time they stay on the screen surface, the lower the probability of passing through the mesh, and the more conducive it is to remove the small particles that adhere to the larger particles.
KOSUN- China Solids Control Leader&Drilling Waste Management Expert
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