If a shaker has many screens (1 over the top of a further), separation is determined by the finest, or bottom screen. The coarsest screen need to constantly be the prime screen. It really is crucial that the bottom screen be checked typically for tears. (See operational suggestions in the finish of this section.)
If a shaker screen has multiple screens in series or if parallel shakers are utilized, separation is determined by the coarsest screen. Shakers in parallel should really use the very same mesh screens. (See operational suggestions at the finish of this section.
Gumbo poses significant problems for screening devices such as shale shakers. Gumbo in a water base mud tends to stick for the screen and is difficult to convey off the screen. Gumbo will not convey out of a pool of liquid and most “high-performance” screening machines will have to become tilted down to enhance the conveyance. The shaker screen ought to be cleaned and initially tilted downhill to 15 degrees, flow ought to then be fed to the unit. The deck angle should really be tilted downhill until the gumbo moves continuously from the feed till it discharges over the finish of the unit. A modify in screen mesh may possibly be required. Some rigs have-devices, referred to as “gumbo busters”, constructed into their flowlines to get rid of the gumbo. To lessen solids loading effects and also the effect of gumbo, a “scalping” shaker or rotating belt which include Derrick’s Flo-LineTm Scalper could be utilized. The scalping shaker will not have to be a high functionality shaker and should really be run with eight to 10 mesh screens. Running finer screens on this shaker will generally demand far more than one particular scalping shaker to meet screen area demands for fluid throughput. Other devices which use a non-vibrating rotating mesh belt, such as Derrick’s Flo-Line Scalper, are useful in removing gumbo ahead of higher functionality shakers.
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