Carboxymethyl cellulose (CMC) is a white flocculent powder with stable properties and is easily soluble in water. Its aqueous solution is a neutral or alkaline transparent viscous liquid, soluble in other water-soluble gels and resins, and insoluble in organic solvents such as ethanol.CMC can be used as an adhesive, thickener, suspending agent, emulsifier, dispersant, stabilizer, and sizing agent.Sodium carboxymethyl cellulose (CMC) is a high-yield, widely used and easy-to-use product in cellulose ethers, commonly known as "industrial monosodium glutamate".

1.CMC-containing mud can form a thin and firm filter cake with low permeability on the well wall, reducing water loss.

2.After adding CMC to the mud, the drilling rig can obtain a low initial shear force, making the mud easy to release the gas wrapped in it, and at the same time quickly discard the debris in the mud pit.

3.Drilling mud, like other suspended dispersions, has a period of existence, and the addition of CMC can stabilize it and extend the period of existence.

4.Mud containing CMC is rarely affected by mold, so there is no need to maintain a high pH value and no preservatives are used.

5.It contains CMC as a treatment agent for drilling mud and well washing fluid, which is resistant to pollution by various soluble salts.

6.The mud containing CMC has good stability and can reduce water loss even if the temperature is above 150℃.CMC with high viscosity and high degree of substitution is suitable for mud with low density, and CMC with low viscosity and high degree of substitution is suitable for mud with high density.