Analysis And Solution of Slurry and Material Running On Rotary Vibrating Screen
2022-06-24
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How to deal with the phenomenon of slurry running during the use of the vibrating screen? The occurrence of this phenomenon is mainly related to factors such as high solid content in the drilling fluid, high mud viscosity, and dispersion of drill cuttings, etc.; it is related to the small vibration force of the vibrating screen, high mesh number, and small screen area. It is related to its own conditions; it also has a lot to do with the direction and position of the liquid inlet of the vibrating screen during on-site installation. You can analyze it step by step from the following points
First of all, the first point is that the number of meshes selected is unreasonable. The capacity of each vibrating screen is 50L/s. This is because the condition of the capacity test is based on the national standard: a 60-mesh screen is selected, and the specific gravity is 1.8 to test the weight of the mud. The viscosity of the mud is that the mud contains different particle sizes. River sand. Due to the rapid drilling of the surface layer, a large amount of solid phase is generated, which takes up the effective screen area, so the vibrating screen cannot use fine screens in shallow wells. Therefore, a larger hole screen should be used at the beginning of drilling, and as the drilling depth increases, finer screens should be gradually adopted.
The second point is that the formation and mud conditions affect the processing capacity. Since the drugs added in the drilling fluid are not fully dissolved and paste on the screen, serious slurry run-out will occur at this time. You should wait until the drug is fully dissolved before using it, or use a larger mesh screen. On the other hand, when drilling into a loose sand-bearing layer or quicksand layer, the sand particles are likely to get stuck in the screen holes, causing screen blockage. Therefore, it is necessary to test several screens with different meshes to reduce the blocking phenomenon.
The third point is to check whether the rotation of the motor is correct. First remove the vibrator shield and check whether the eccentric blocks of the two motors rotate outwards. Secondly, if the steering is wrong, please exchange any two phase wires in the incoming power supply of the electric control box. Wrong way 1 (two motors rotating towards the inside), although the drill cuttings can also be removed outwards, but the speed is slow; Wrong way 2 (two motors rotating in the same direction), the vibration force is very small, basically does not discharge sand or mud .
The fourth point is to check the amplitude of the vibrating screen. The larger the vibration amplitude is, the more general processing capacity is; the vibration force is adjusted to 90% when leaving the factory. If there is a slurry running situation, you can align the inner and outer eccentric block angles, and the vibration force is 100%. (At this time, the mud processing volume only increases by about 15%)
Fifth point, check whether the liquid flow distribution on the screen frame is reasonable. For the vibrating screen with a hook-side screen structure, the screen surfaces on both sides are lower than the middle, and the mud is easy to flow to both sides and lose. It should be ensured that the mud enters the screen frame from the middle. At this time, two solutions can be adopted. One is to adjust the front spring seat to properly raise the angle of the front of the screen box; the other is to adjust the position of the turning plate of the extension slot to control the distribution of liquid flow.
