CMC

CMC has a high ability to control water loss. In particular, PAC is a highly effective fluid loss reducer at lower dosages. You can control the loss of water to a higher level. It does not affect other properties of the mud.

The formed mud cake is of good quality, strong and tough.

It has good temperature resistance and excellent salt resistance. Under a certain salt concentration, it still has a good ability to reduce water loss and maintain a certain rheology. Compared to soluble in salt water and soluble in water, the viscosity hardly changes. Particularly suitable for offshore drilling and deep well requirements.

It can well control the rheological properties of the mud. It has good non-Newtonian fluidity.

Influencing factors of CMC

Sodium carboxymethyl cellulose plays an important role in food, textile, medical and other industries, but sodium carboxymethyl cellulose is not a particularly stable product in fact, many factors will affect it, and then cause changes in characteristics.

1. The water content

CMC is actually a kind of moisture products, if stored improperly placed in the air, it will be easy to be damp, resulting in the change of the concentration of active substances, affecting the performance of the product, so sodium carboxymethyl cellulose must be stored in a closed container or the original packaging.

2. The temperature

As with most solutions, the viscosity of sodium carboxymethyl cellulose solution will decrease as the temperature increases, but once the temperature cools, the viscosity will return to the initial viscosity, and sodium carboxymethyl cellulose dry state, can withstand temperature below 140-150℃ for several minutes.

3. The metal salt

Sodium carboxymethyl cellulose can react with some metal salts, such as aluminum salt, tin salt and lead salt, ferric salt, silver salt, copper salt and zirconium salt, the reaction will precipitate the corresponding cellulose hydroxylacetate metal salt, of course, sodium carboxymethyl cellulose will not react with all sodium salts, such as calcium salt and magnesium salt will not. It is worth mentioning that the presence of low concentration of alkali salts will usually reduce the viscosity of the solution, but the presence of high concentration of alkali salts will increase the viscosity of the solution and even cause gelation in some cases.

In general, water content, temperature, metal salt these three factors will have a greater impact on sodium carboxymethyl cellulose.