Drilling mud seperated from the cuttings

Drilling mud is used to control subsurface pressures,lubricate the drill bit,stabilize the well bore,and carry the cuttings to the surface,among other functions.Mud is pumped from the surface through the hollow drill string,exits through nozzles in the drill bit,and returns to the surface through the annular space between the drill string and the wall of the hole.

Drilling mud seperated from the cuttings

With the drill bit grinds rocks into drill cuttings,these cuttings become entrained in the mud flow and are carried to the surface.In order to return the mud to the recirculating mud system and to make the solids easier to handle,the solids must be seperated from the mud involves circulating the mixture of mud and cuttings over shaker screens and is recirculated back to the mud tanks from which mud is with drawn for pumping downhole. The drill cuttings remain on top of the shale shaker screens; the vibratory action of the shakers moves the cuttings down the screen and off the end of the shakers to a point where they can be collected and stored in a tank or pit for further treatment or management.

There are often used two series of shale shaker,the first use coarse screen to remove only the larger cuttings.The second series use fine mesh screen to remove much smaller particles.