Functions of Drilling Fluids

1.Provide well bore stability
2.Transport cuttings & cavings to surface
3.Suspend solids
4.Control subsurface pressure
5.Cool and lubricate bit and drill string
6.Transmit hydraulic energy to down-hole tools
7.Provide a medium for data acquisition
8.Minimize formation damage
9.Protect drill string and casing from corrosion