Introduction

CMC-H is a technical-grade high-viscosity sodium carboxymethyl cellulose used to reduce filtration in fresh water and seawater mud systems up to 250°F. It is less effective in brines and saltwater and is not generally recommended to be used if the salinity exceed 50,000 ppm.

CMC-H is used in low-viscosity or low-solids fluids and increase viscosity in addition to controlling fluid loss. Subject to bacterial degradation, a biocide should be used to prevent fermentation. CMC-H treated systems should be pretreated with either sodium bicarbonate or possibly citric acid prior to drilling cement.

Applications/Functions

Control filtration rates in freshwater and seawater mud systems

Deflocculate some seawater muds when used in low concentrations

Advantages

Temperatures stable up to 250°F

Widely available and an economic source of polymer fluid-loss control

Concentrated chemical, very effective at small treatment levels

Typical Properties

Appearance: White powder

Specific gravity: 1.59

pH (5% aqueous solution): 9-11

Recommended Treatment

Freshwater: 0.5-1.5 ppb

Seawater:  2-3 ppb

Add slowly through a mixing hopper at a rate of 10-20 min/sack

Package

25 KG SACK