... .high D.S. 3.CMC for oil drilling grade Drilling Fluid Carboxymethyl Cellulose (CMC) Petroleum grade Product features:1, high degree ... , good uniformity of substitution .2, high transparency, viscosity and water loss can be controlled .3, suitable for fresh water, sea water ... a well .5, can improve mud-making volum, reduce filteration loss .6, has excellent performance in drilling of oil .Drilling mud ...