DYNASTAR-CM, the salt-tolerant fluid loss controller in drilling mud, is a chemically modified (carboxymethylated) product from tapioca starch.

It can be quickly dissolved in cold water to form clear gelatin. When used in water-base drilling mud, it works well in fluid loss control and wall protection. It is featured by shear resistance, salinity tolerance and calcium tolerance, and will not break down easily. With its low Degree of Substitution (DS) of 0.23, UNISTAR-CM has better bio-degradability than CMS derived from potato starch with DS exceeding 0.4, thus is more environmentally friendly. This is backed up by laboratory test result as attached.

DYNASTAR-CM is suitable to many kinds of drilling mud. Its cost is reasonable, and dosage is low, which helps to reduce the overall cost of drilling mud. DYNASTAR-CM is in full conformity with modified starch specification stipulated by API 13A. It can work up to 120°C without deterioration.