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They then are screened out of the mudstream by the shale shaker and fall on a pile at its base.
Shale shakers are the primary solids separation tool on a rig.
After returning to the surface of the well the used drilling fluid flows directly to the shale shakers where it begins to be processed.
The cuttings are also be removed by mechanical means such as shale shakers, de-sanders or de-silters.
Shale shakers consist of the following parts:
The possum belly is used to slow the flow of returning drilling fluid before it hits the shale shakers.
He is also responsible for the shale shakers and the mud pumps (making sure they run well and fixing them when a fault occurs).
This enables the shale shaker to clean the cuttings out of the drilling fluid before it is returned to the pits for circulation.
Desanders are installed on top of the mud tank following the shale shaker and the degasser, but before the desilter.
Each stage of separation progressively removes smaller cuttings through shale shakers, hydrocyclones, and centrifuges.
Shale shakers are components of drilling equipment used in many industries, such as coal cleaning, mining, oil and gas drilling.
The solids removed by the shale shaker are discharged out of the discharge port into a separate holding tank where they await further treatment or disposal.
Mud weight can be decreased by dilution or solids control equipment such as an industrial centrifuge, desilter, desander and shale shaker .
Normally, a solid control system contains five stages: the mud tank, shale shaker, vacuum degasser, desander, desilter, and centrifuge.
I was generally found at the shale shakers where the drilling fluid returned from deep in the ground and was sieved before progressing to the treatment pits.
Cuttings are then filtered out with either a shale shaker, or the newer shale conveyor technology, and the mud returns to the mud pits.
Desanders are preceded by gas busters, gumbo removal equipment (if utilized), shale shaker, mud cleaner (if utilized) and a vacuum degasser.
The shale shaker is used to separate big solids with diameter above 75μm, the desander addresses solids from 45-74μm, and the desilter segregates solids between 15-44μm.
The returning mud can contain natural gases or other flammable materials which will collect in and around the shale shaker / conveyor area or in other work areas.
Drill cuttings can be separated from liquid drilling fluid by shale shakers, by centrifuges, or by cyclone separators, the latter also being effective for air drilling.
This motion is usually used for sticky solids.NOV Brandt VSM 300 shale shaker is the world's first balanced elliptical motion shaker.
The free gas then is moved into the flare line to reduce the threat of toxic and hazardous gases and the mud then discharges to the shale shaker and to the tank.
Furthermore, supporting equipment is needed to assist directional-drilling or HDD to work smoothly, such as drilling mud recycling system, shale shaker, mud cleaner, centrifugal pump, mud tanks, etc.
Nomally the shale shaker and vacuum degasser and desander are mounted together on the same mud tank as the first tank at the oilfield, while desilter and centrifuge on the second tank.
The purpose of the possum belly is to slow the flow of the drilling fluid (after it has gained momentum from coming down through the flow line) so that it does not shoot off of the shale shakers.