Jun 01

Shale shakers remove solids by processing solid-laden drilling fluid over the surface of a vibrating screen. Particles smaller than the screen openings pass through the screen along with the liquid phase of the drilling fluid. Larger particles and trapped finer particles are separated into the shaker overflow for discard.

For any particular shale shaker, the size and shape of the screen openings have a significant effect on solids removal. For this reason, the performance of any shaker is largely controlled by the shaker screen used.

Shaker Screen Identification

The nomenclature used to describe shaker screens is important in obtaining an accurate representation of the screen performance. Over the past few years, many new screen designs and types have created much confusion in the drilling industry. Traditionally the mesh count, opening size and percent open area have been used to characterise a shaker screen. However, this description, along with a multitude of different screen clothes led to confusion over that actual screening ability of an individual product.

Shaker Screen Mesh Size Designation

Plain square and rectangular weaves are often referred to by the number of wires (or openings) in each direction per linear inch. This is known as the mesh count. The screen mesh count is determined by starting at the centre of one wire and counting the number of openings along the screen grid to the next wire centre, one linear inch away. For example, an 8-mesh screen has 8 openings in two directions at right angles to each other. When counting mesh, a magnifying glass scale designed specifically for this purpose is helpful. Use of a single number for describing screens implies a square mesh. For example “20 mesh” usually describes a screen having 20 openings per inch in either direction along the screen grid. Oblong mesh screens are generally labelled with two numbers. A “60 x 20 mesh”, for example is usually understood to have 60 openings in one direction and 20 openings per inch in the perpendicular direction. Referring to a “60 x 20 mesh” screen as an “oblong 80 mesh” is confusing and inaccurate. Please contact GN Solids for more information

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