The problems and solutions about shaker screen

Shaker screen blinding takes place while particles of solids being screened embed in a screen hole. This usually appears while drilling fine sands , for instance, in the Gulf of Mexico. The right after sort order is observed in the course of screen blinding.

1.  When a brand-new screen is set up, the circulation drilling fluid drops through the screen for a short distance.

2.  After a period of time, the fluid endpoint moves to the end of the shale shaker.

3.  In a very short time this happens, the screens are changed to get rid of the fast discharge of drilling mud from the end of the shaker.

4.  Soon after the screens have been washed, fine grains of sand which are lodged on the screen's surface can be discovered. The surface area of the screen will resemble fine sand paper because of the sand particles lodged in the openings.

One common approach to the problem to screen blinding is to change to a finer or coarser screen that the one being blinded. This strategy is effective if the sand which is being drilled has a narrow size distribution. Another method is to change to are rectangular-shaped screen, although rectangular screens can also blind with multiple grains of sand.

Blinding – the “plastering” of a soft material over and in the mesh, rendering it blocked. Remedy wash with high pressure fluid using the base fluid of the drilling fluid. If this fails, fit coarser screens temporarily.

Plugging – the blocking of the mesh by a particle (usually sand)  fitting into the pore throat of the mesh. Remedy - wash with high pressure fluid using the base fluid of the drilling fluid. This is best done from beneath the screen . It is often successful to place a fine screen on to reduce the “near size” plugging.

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