Carboxymethyl cellulose sodium (CMC Na) is an organic compound with the chemical formula [C6H7O2 (OH) 2OCH2COONa] n. It is a carboxymethyl derivative of cellulose and the most important ionic cellulose gel. Sodium carboxymethyl cellulose is typically an anionic polymer compound produced by reacting natural cellulose with caustic soda and chloroacetic acid, with molecular weights ranging from several thousand to millions. CMC Na is a white fibrous or granular powder that is odorless, tasteless, hygroscopic, and easy to disperse in water to form a transparent colloidal solution

CMC can play an important role in unconventional oil and gas extraction include reducing filtration loss, enhancing mud stability, preventing mud contamination, improving drilling efficiency, and preventing fungal effects. . The extraction of unconventional oil and gas resources requires higher performance from drilling and fracturing fluids. CMC, with its excellent performance, can effectively improve the efficiency and economic benefits of unconventional oil and gas extraction. In addition, with the increasing awareness of environmental protection, the demand for green chemical products is constantly increasing, and CMC with good biodegradability will receive more and more attention and importance

Here are its 5 main functions

1. Reduce filtration loss and mud cake thickness: CMC can significantly reduce filtration loss and thin mud cake thickness in low solid and solid free drilling fluids. This helps to control fluid loss during drilling and maintain wellbore stability.

2. Enhance mud stability: CMC can form a stable suspension system for mud, which can maintain good stability even at high temperatures. This helps to maintain the physical properties of drilling fluid and ensure the smooth progress of drilling operations.

3. Preventing Mud Pollution: CMC can resist the pollution of various soluble salts, so it can effectively prevent mud pollution during drilling and maintain the stability of mud performance.

4. Improve drilling efficiency: CMC can form a thin, hard, and low-permeability filter cake in the wellbore, thereby reducing water loss and improving drilling efficiency.

5. Preventing mold influence: Mud containing CMC is rarely affected by mold, so it is not necessary to maintain a high pH value or use preservatives. This helps to extend the service life of drilling fluid and reduce maintenance costs.