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Why shaker screen has screen blinding

Screen blinding occurs when grains of solids being screened lodge in a screen hole. This often occurs when drilling fine sands, such as in the gulf of mexico. The following sequence is often observed during screen blinding:

1. When a new screen is installed, the circulation drilling fluid falls through the screen in a short distance.

2. After a time, the fluid endpoint travels to the end of the shaker.

3. Once this occurs, the screens are changed to eliminate the rapid discharge of drilling mud off the end of the shaker.

4. After the screens have been washed, fine grains of sand that are lodged in the screen surface can be observed. The surface of the screen will resemble fine sandpaper because of the sand particles lodged in the openings.

 

Most eshaker screenvery screen used in the oil field is blinded to some extent by the time it needs replacing. For this reason, when the same screen size is reinstalled, the fluid falls through the screen closer to the feed.

One common solution to screen blinding is to change to a finer or coarser screen than the one being blinded. This tactic is successful if the sand that is being drilled has a narrow size distribution.

shaker screen1

Another solution is to change to a rectangular screen, although rectangular screens can also blind with multiple grains of sand. Unfortunately, the process of finding a screen size that will not blind is expensive.

In the late 1970s, the layered screen was introduced to avoid screen blinding. This hook strip screen was mounted on a downholl sloping, unbalanced elliptical motion shale shaker vibrating at 3600rpm. The two fine layers of screening cloth, supported at 4 inch  intervals, tended to dislodge fine grains of sand and would only blind about 25% in severe laboratory tests, leaving 75% of the screen unblinded. The non-blinding feature is assumed to be the result of the deceleration of the two screens. The wire diameter is in the range of 0.002 inch and the opening size are in the range of 0.004 inch.

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