Drilling shale shaker meaningful is recovering the liquid phase, Separate different size solid phase. Solids Control equipment is the most cost effective way to remove drilled solids. With any solids removal program, the filtering begins at the flowline. The shale shaker is an economical choice with its simple design and minimal maintenance requirements.
A standard shaker or fine screen shaker is vital to the solids control and should process 100% of the mud returning from the starting pit before allowing this mud to be processed by any of the downstream equipment you may utilize in your solids control system. Located directly downstream from the shale shaker will be one or more hydrocyclone devices that will employee desilters, desanders or both. There are a number of industrial claims that indicate that hydrocyclones can achieve solid cuts lower than 25 microns, however when it comes to the practical application and use of solids control systems, operators should conservatively assume 25 microns as the performance limit.
Table 1 highlights the hydraulic design criteria and the characteristic cut point that can be achieved with each primary solids control device.
|Table 1 – 2018 Solid Control Device efficiency||Target Design Consideration||Cut Point Consideration|
|Shaker System||125% of the Rig Circulation Rate||Target a 74 Micron Cut|
|Hydrocyclone System||125% of the Rig Circulation Rate||Target a 25 Micron Cut|
|Centrifuge System||20% of the Rig Circulation Rate||Target a 5 Micron Cut|
|Tank Capacity|| 6 Times the Rig Circulation Rate
(Should be no less than 5 times)
| Requires A Separate Tank for
Each Cut Achieved
Shale shakers remove solids from drilling fluid as the mud passes over the surface of a vibrating screen. Particles, smaller than the openings in the screen, pass through the holes of the screen along with the liquid phase of the mud. Particles too large to pass through the screen are thereby separated from the mud for disposal. Without proper screening of the drilling fluid during this initial removal step, reduced efficiency and effectiveness of all downstream solids control equipment in the system is assured. The downstream hydrocyclones will simply be overloaded beyond their design capacity. The most effective shakers utilized within the HDD industry can be categorized as either balanced elliptical motion or linear motion shakers.