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Aus-Dex
Filtration Control Agent
DESCRIPTION
AUS-DEX is a modified polysaccharide used for filtration
control and drilled solids encapsulation in most waterbased
systems without appreciably affecting viscosity.
AUS-DEX is a natural product, stabilised against bacterial
degradation and is functional in fresh water, salt saturated brines
and high hardness environments. AUS-DEX is non-damaging,
can be used in systems exposed to temperature between 0 -
120ºC and is an effective additive in controlling reactive clays
and shale from swelling and dispersing.
APPLICATIONS/FUNCTIONS
AUS-DEX is used primarily for filtration control but may be
used with other polymers to provide maximum encapsulation
and borehole stabilisation. It is recommended to lower
filtration rates in most water-based drilling fluid systems
and ideal in areas where differential sticking is a problem.
ADVANTAGES
- Enhances stability to bacterial attack
- Compatible in most water-based drilling fluid systems
- No appreciable effect to rheology
- Effective in a wide range of make-up waters, fresh, hard,
brackish and saturated salts
- Supports hole stability through filtration control and solids
- Forms a gelatinous flow barrier controlling spurt loss
- Thermally stable to 120ºC
- Environmentally acceptable
- Non toxic and non polluting
TYPICAL PROPERTIES
- Appearance: Off white free flowing powder
- Ionic character: Nonionic
- pH (1 % solution): 5.0 – 7.0
- Specific gravity: 1.3
RECOMMENDED TREATMENT
- AUS-DEX is added slowly through a hopper or mechanical
shearing device at a rate of 4 – 12 kg per 1000 litres to help
reduce filtration.
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