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6878480 
Journal Article 
Thermal stability of xanthan gum biopolymer and its application in salt-tolerant bentonite water-based mud 
Zou, Z; Zhao, Q; Wang, Q; Zhou, F; , 
2019 
Yes 
Journal of Polymer Engineering
ISSN: 0334-6447 
WALTER DE GRUYTER GMBH 
BERLIN 
39 
6 
501-507 
English 
WOS:000473480800001 
Xanthan gum from Xanthomona campestris (XC) is a chain-like polysaccharide biopolymer with good salt tolerance. The temperature resistance of XC seriously affects its application in drilling fluids. Results have shown that when the temperature of the XC solution rose to 120 degrees C, after several hours the shear stress of the XC solution was almost 0 mPa . s at different shear rates. In this study, the molecular structure of XC was enhanced by crosslinking with chromic oxalate and borax and then adding sodium sulfite to further enhance the temperature resistance of the gum. Selected materials such as MgO, layered double-hydroxide, attapulgite, and asbestos fiber were added as shearing resistance reagents. Through continuous experimentation, the amounts of the reagents were optimized. After 120 degrees C aging test, the drilling fluids of modified XC (MXC) could still maintain good theological properties and low fluid loss. The application in China Dagang oilfield indicated that 0.019 w/v% MXC could improve the yield point from 6.5 to 8 Pa. MXC could also be used in bentonite to prepare salt-tolerant bentonite, which was successfully used in offshore exploration and construction engineering. 
salt-tolerant bentonite; temperature resistance; water-based mud; xanthan gum