Cellulose additives: PAC, CMC, HEC, and PAM are usually selected and proportioned according to the specific requirements of the drilling fluid and geological conditions to achieve liquid phase control and wellbore protection during the drilling process.
Common cellulose additives in drilling fluid slurries include:
1. Polyanionic cellulose (PAC): PAC is often used in drilling fluids as a thickener, adsorbent and precipitant to help control the viscosity of the drilling fluid, purify the liquid and stabilize the bottom hole temperature and pressure.
2. Carboxymethylcellulose (CMC): CMC is usually used as a stabilizer and thickener to improve the viscosity and stability of drilling fluids.
3. Hydroxyethyl cellulose (HEC): HEC is often used to adjust the rheological properties of drilling fluids and has thickening and dispersing effects.
4. Xanthan Gum: Xylan is a biopolymer that is often used in drilling fluids as a thickener and emulsifier to help improve the viscosity and stability of the liquid.
5. Phenolic Resin: Phenolic resin is often used in drilling fluids as a dispersant and cementing agent, which can improve the dispersion and strength of drilling fluids.
6. Polymer-Based Drilling Fluid: Some polymer compounds can also be used as cellulose additives in drilling fluids, such as polymerized acrylamide (Polyacrylamide), etc., to improve the viscosity and stability of the liquid.
Cellulose additives: PAC, CMC, HEC, and PAM are usually selected and proportioned according to the specific requirements of the drilling fluid and geological conditions to achieve liquid phase control and wellbore protection during the drilling process.
