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It mainly carries cuttings from the bottom of the well to the surface. With the rapid development of oilfield science and technology, drilling fluids have developed from only meeting the needs of bit drilling to adapting to all aspects of drilling.

1. Clean the bottom of the well, suspend and carry cuttings to keep the hole clean.

2. Balancing formation pressure, stabilizing borehole wall, preventing borehole collapse, blowout and leakage.

3. Transfer water power to help drill bit break rock.

4. Transfer power for downhole power drilling tools.

5. Cooling bits and drilling tools.

6. Geological and gas logging with drilling fluid.

7. Offshore oil drilling and completion projects, including geology, exploration, cementing, casing running, logging and so on, all need to be completed through the cooperation of mud.

There are many functions of drilling mud.