Saved in:
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Artículo Open Access |
| Published: |
Wiley
2026
|
| Subjects: | |
| Online Access: | https://onlinelibrary.wiley.com/doi/10.1002/app.70721 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Table of Contents:
- Blending vs. Grafting: Thermal Stability Optimization of Xanthan Gum With Carbon Microspheres as Fluid‐Loss Additives Jiahao Shu Xueqiang Wang Faizan Ikhlaq Yong Wu Yuan Zhou Jiayin Zhang Yongkui Zhang Tonghui Xie Journal of Applied Polymer Science ABSTRACT Xanthan gum (XG) is a shear‐thinning fluid loss agent widely used in drilling fluids, yet its poor thermal stability limits its application in high‐temperature deep wells. In this work, carbon microspheres (CMS) were introduced into the XG matrix through covalent grafting and physical blending, respectively. The grafted product XG@CMS showed a tripled molecular weight (Mn = 8.11 × 10 5 g/mol, Mw = 8.72 × 10 5 g/mol) and improved solubility (WS = 93.4% ± 0.5%), along with a slightly increased maximum degradation temperature. However, its viscosity and shear‐thinning behavior decreased remarkably ( τ ₀ = 0.04 Pa, K = 0.01 Pa sⁿ). By contrast, physically blended XG/CMS maintained excellent viscoelastic properties ( τ ₀ = 1.34 Pa, K = 5.01 Pa sⁿ) and presented higher storage modulus, loss modulus, and conformational transition temperature. High‐temperature high‐pressure filtration tests showed that XG/CMS reduced fluid loss by 20.8%, attributed to electrostatic repulsion and plugging effects from degradation products. XG/CMS exhibited a zeta potential of −41.7 mV and micrometer‐scale particles, supporting the synergistic mechanism. This study provides a strategy for designing high‐performance fluid loss reducers for drilling fluids. 10.1002/app.70721 http://onlinelibrary.wiley.com/termsAndConditions#vor