Fluid-Loss Control Additives
Carboxymethyl Starch (CMS) Fluid-Loss Control Additive
CMS
An anionic polymer derived from natural starch by etherification, CMS is an odorless white-to-yellowish powder that dissolves easily to form a viscous, transparent colloid. It provides fluid-loss control, viscosity building and shale stabilization in water-based muds, with good biodegradability for environmentally sensitive operations.
APPLICATIONS
Application scenarios
- 01Fluid-loss control and viscosity building in water-based muds
- 02Saltwater and saturated saltwater systems (Type I rated to 120 °C, Type II to 140 °C)
- 03Environmentally sensitive drilling operations
PERFORMANCE
Performance indicators
| Item | Specification | |||
|---|---|---|---|---|
| Item | Type I (120 °C) | Type II (140 °C) | ||
| Appearance | White, Milky-White or Pale Yellow Free-Flowing Powder | |||
| Fineness (Residue on 0.425 mm Sieve) ,% ≤ | 10.0 | |||
| Moisture ,% ≤ | 10.0 | |||
| pH | 7～9 | |||
| Degree of Substitution (D.S.) ≥ | 0.25 | |||
| Drilling Fluid Performance | 4% Saltwater Mud | Apparent Viscosity mPa·s ≤ | 8.0 | |
| Drilling Fluid Performance | 4% Saltwater Mud | API Fluid Loss mL ≤ | 15.0 | 18.0 |
| Drilling Fluid Performance | Saturated Saltwater Mud | Apparent Viscosity mPa·s ≤ | 12.0 | |
| Drilling Fluid Performance | Saturated Saltwater Mud | API Fluid Loss mL ≤ | 20.0 |
USAGE
Usage
Add directly through the mixing hopper with good agitation; typical dosage is 0.5%-2.0% by weight. Compatible with bentonite, polyacrylamide and cellulose additives.
PACKAGING
Packaging & delivery
25 kg/bag standard; export packaging available on request.
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Carboxymethyl Starch (CMS) Fluid-Loss Control Additive · CMS