Zero-discharge mud recycle system is loop system that use the drilling mud continually while performing filtering for solids that contain in the mud. The function is similar human’s blood system. To treat the mud properly through solids control, the mud system need to consider in points below:
- Drilling rig type and spec
- Speed of the drilling process
- Solids that will be filter
- bore length
- The gallon per minute (GPM) of the pumps
- Volume and amount of tanks that are needed
- How many and what size of hydrocyclone
- The filter screen size for shale shaker and mesh number
These factors determine your mud system that is adequate enough to clean the mud and protect the components and the drill bit of the rig, pumps and mud cleaners.
Treating Capacity: Rule of thumb, double the actual treating capacity.
The mounting of system; trailer or skid. Trailer mount is need mount on trailer and it becomes part of the system. Skid mount is detachable from the flat transportation method.
Shale shaker screen area: Larger the treating area, treating volume is larger. if project needs.
Mesh selection: In reference the solids that need to be filtered. The mesh# (API#) is number of opening per square inch. Depend the solids size and density of the mud will determine choice of the screen.
Shale Shakers: There are three different kind of shale shakers (orbital, elliptical and linear). Orbital is a circular motion and elliptical isn’t perfectly circular — it’s an ellipse or oval. Linear has vibration that is induced by a pair of eccentric (or eccentrically weighted) shafts turning in opposite directions. This type of arrangement allows for the development of straight line or linear motion that can also be produced in a positive (uphill) incline.
While each kind of shale shaker has a specific place that it will stand-out from other choices such as unit selling price, the ability to process heavy clays and rock or fines and ultra-fines, our overall preference of choice is the linear.
Hydrocyclones: desander, desilter and mud cleaner combo machinery are all use various size of hydrocycles to filter the solids from the drilling mud. Each cone size has a micron cut point, which is the size of the smallest particle that the cone can pull out. The 4 inch cones have a micron cut of 20 microns and the 10 inch. have a 74 micron cut.