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1. Maintain hydrostatic pressure.
2. Lifting cuttings.
3. Cooling the bit.
4. Lubricant the string.
5. Gathering information.
6. Prevent caving's.
maintain hydrostatic pressure
cooling the bit
lubricant
lifting cuttings
it has six functions of drilling mud :
1- Removing cutting
2- cooling.
3- gathering information
4-buoyancy
5- controlling pressure
6- transmitting power.
