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SODIUM SILICATE
Sodium Silicate is a water soluble additive used as primary chemical for wellbore stabilization. Secondary
inhibition is achieved with the use of KCL and NaCl.
Physical Properties
Appearance : Colorless, viscous, alkali
Molecular Ratio, SiO2:Na2O : 2.6 to 2.8
Specific Gravity : 1.3 to 1.5
pH : ˃11.5
Solubility : Soluble in water
Application
Sodium Silicate is a water soluble liquid with 2.6 to 2.8 SiO2 to Na2O ratio. It can be used to provide superior
chemical inhibition to reactive shales, clay and claystone formations, chalk formations, and formations interbedded
with dispersive clays. Treatment with 8% (by volume) is the most effective maintenance concentration for optimum
inhibition.
Sodium Silicate systems are formulated with conventional drilling fluid polymers to achieve the required
rheological and fluid loss properties. It is successful used in the field with densities varying from 9 to 14lb/gal (1.1
to 1.7sg). The temperature limitation for the system can be extended to 275°F (135°C). It readily reacts with Ca2+
and Mg2+ ions. High concentrations of divalent ions will deplete the effective silicate concentration and dimish its
inhibitive performance. The use of potassium carbonate can also be used to enhance inhibitive performance.
Advantages
Highly effective shale and clay stabilizer
No adverse effect on fluid rheology and filtration properties
Provides effective corrosion control
Effective in freshwater and NaCl and KCl salt systems
Effective at temperature up to 275°F(135°C)
Toxicity and Handling
Handle as an Industrial chemical, wearing protective equipment and observing the precautions as described on the
MSDS.
Packaging
Sodium Silicate is packed in 55 gal (208L) drums. Store in a dry, cool location away from sources of heat or
ignition.