Rheological characterisation of xanthan gum in brine solutions at high temperature
•Potassium and calcium brines extend the shear-thinning behaviour of xanthan.•Thermorheological behaviour of xanthan depends on the type of salt in the brine.•Formate brine shifts the order/disorder transition of xanthan to high temperature. Xanthan gum solutions are used in the oil industry for flo...
Gespeichert in:
Veröffentlicht in: | Carbohydrate polymers 2019-01, Vol.203, p.103-109 |
---|---|
Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | •Potassium and calcium brines extend the shear-thinning behaviour of xanthan.•Thermorheological behaviour of xanthan depends on the type of salt in the brine.•Formate brine shifts the order/disorder transition of xanthan to high temperature.
Xanthan gum solutions are used in the oil industry for flooding, drilling and completion operations. The stabilization of the structure of xanthan gum solutions in presence of salts increases the value of both the order-disorder transition temperature and the gel strength. This effect is very important in order to design drilling and completion fluids since not only density and viscosity of the fluid can be improved by increasing the concentration of salts but also the range of temperature where the solution shows viscoelastic behaviour can be extended.
This paper presents results from a study on the rheological behaviour of xanthan gum solutions in different saturated brines. Chloride and formate potassium brines not only increase the viscosity of the solution but also extend the shear thinning behaviour to temperatures near 200 °C, maintaining a simple relaxation mechanism over the whole range of temperature where the ordered conformation dominates the rheological behaviour. |
---|---|
ISSN: | 0144-8617 1879-1344 |
DOI: | 10.1016/j.carbpol.2018.09.034 |