Shi Jingqi, Chen Long, Xie Ruihan, Zhang Jiayin, Pi Shuangcheng, Yang Jiaming, Zhao Yunhai, Xiong Feng, Zhang Yongkui, Xie Tonghui
School of Chemical Engineering, Sichuan University, Chengdu, Sichuan 610065, China.
Engineering Technology Research Institute of Southwest Oil & Gas Field Company, PetroChina, Chengdu, Sichuan 610017, China.
Carbohydr Polym. 2025 Mar 1;351:123013. doi: 10.1016/j.carbpol.2024.123013. Epub 2024 Nov 26.
Xanthan gum (XG), recognized for its environmentally friendly properties and versatile capabilities, has been studied for drilling fluid applications. However, its limited solubility and thermal stability restricts its broader use. In this study, a modified XG derivative, XG-g-KH570 modified SiO, was synthesized by grafting XG with KH570-modified nano-SiO. The modified product exhibited lower molecular weights with M and M of 3.00 × 10 g/mol and 3.77 × 10 g/mol, respectively. Its pyruvate and acetyl contents decreased to 2.72 % and 1.68 %, respectively. Meanwhile, XG-g-KH570 modified SiO showed a higher branching degree of 45.3 % based on methylation analysis. In terms of performance, XG-g-KH570 modified SiO exhibited improved water solubility. XG-g-KH570 modified SiO demonstrated superior high-temperature and high-salinity performance, retaining high viscosity retention and viscoelasticity. Additionally, XG-g-KH570 modified SiO exhibited a markedly reduced fluid loss of only 3.4 mL at 150 °C, compatible with conventional desulphonated drilling fluids. Furthermore, its high-temperature thickening and fluid loss control mechanisms was found to be associated with an enhanced cross-linked network structure based on the zeta potential and particle size distribution under high-temperature and salinity conditions. These results represent a promising advancement in the field of biomolecular drilling fluid additives, providing an efficient and eco-friendly solution for the oil and gas industry.
黄原胶（XG）因其环保特性和多功能性而闻名，已被研究用于钻井液应用。然而，其有限的溶解度和热稳定性限制了其更广泛的使用。在本研究中，通过将XG与KH570改性的纳米SiO₂接枝合成了一种改性XG衍生物，即XG-g-KH570改性SiO₂。改性产物的分子量较低，Mη和Mw分别为3.00×10⁵g/mol和3.77×10⁵g/mol。其丙酮酸和乙酰基含量分别降至2.72%和1.68%。同时，基于甲基化分析，XG-g-KH570改性SiO₂显示出更高的支化度，为45.3%。在性能方面，XG-g-KH570改性SiO₂表现出改善的水溶性。XG-g-KH570改性SiO₂表现出优异的高温和高盐性能，保持了高粘度保留率和粘弹性。此外，XG-g-KH570改性SiO₂在150℃时的滤失量显著降低，仅为3.4mL，与传统的磺化钻井液相当。此外，基于高温和高盐条件下的zeta电位和粒径分布，发现其高温增稠和滤失控制机制与增强的交联网络结构有关。这些结果代表了生物分子钻井液添加剂领域的一项有前景的进展，为石油和天然气行业提供了一种高效且环保的解决方案。
