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Thermal Gravimetric Characterization of Dynamic Thermal Aged Polymer-Modified K+- Rich Bentonite Composites in Aqueous Environment: Water-Based Drilling Fluid Application

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Abstract:

Bentonite is widely used in water-based drilling fluids (WBF) due to its strong colloidal properties in aqueous systems, provided API standards are met. Conventionally, bentonite performance is enhanced through Na2CO3 activation; however, this approach may be inadequate for bentonites with uncommon mineralogical compositions. Building on our previous work, which involved modifying a K⁺-rich bentonite with a unique composition activated by Na2CO3 and further modified with polymers to achieve API-compliant WBF. Among all polymers tested, Xanthan gum and CMC exhibited the most promising performance and were subjected to dynamic thermal aging at high temperatures. Filtration tests were conducted, and the resulting filter cakes were characterized using TGA/DTG to evaluate thermal stability. The composite with CMC exhibited a higher final residue (83.5%) compared to xanthan gum (78.41%), indicating enhanced thermal stability, stronger polymer-clay interactions, and reduced polymer volatilization. This investigation emphasizes the contribution of bentonite to environmental sustainability.

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Periodical:

Key Engineering Materials (Volume 1060)

Pages:

115-123

DOI:

https://doi.org/10.4028/p-zvAe7h

Citation:

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Online since:

July 2026

Authors:

Youstina Ramsis*, Ernestos Sarris, Konstantinos Chrissafis, Anastasia Rousaki, Demetris Vattis

Keywords:

Circular Economy, Drilling Fluid Systems, Dynamic Thermal Aging, Polymer-Bentonite Composites, Sustainable Development, Thermal Gravimetric Analysis (TGA/DTG)

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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