This study aims at evaluating the performance of thiamine as a new eco-friendly shale inhibitor in water-based drilling fluids (WBDFs). The evaluation experiments include sedimentation, bentonite inhibition, filtration, zeta potential, thermal gravimetric analysis, scanning electron microscopy, X-ray diffraction, shale cuttings recovery, linear swelling and Fourier transform infrared spectroscopy (FTIR). The performance of thiamine was compared to potassium chloride. In contrast to deionized water, the aqueous solution of thiamine exhibited greater power to inhibit montmorillonite (Mt) dispersion, much more Mt loading capacity (280 g/L) and fluid loss, lower Mt mass loss, larger aggregated Mt particles, lower interlayer space of the Mt particles, less shale cuttings disintegration and lower linear swelling. Adsorption of thiamine on Mt led to a significant shift in the value of zeta potential (from −17.1 to +8.54 mV). Thiamine demonstrated superior inhibitive performance than potassium chloride. FTIR analysis confirmed that thiamine is adsorbed on Mt particles. The compatibility test revealed the compatibility of thiamine with conventional WBDF additives. It was concluded that the main probable inhibition mechanisms of thiamine are the cation exchange and Mt surface coating. In view of its prominent inhibition capacity and great environmental acceptability, thiamine is a promising inhibitor for drilling in water-sensitive formations.

这项研究旨在评估硫胺素在水基钻井液（WBDF）中作为新型环保页岩抑制剂的性能。评估实验包括沉降，膨润土抑制，过滤，ζ电位，热重分析，扫描电子显微镜，X射线衍射，页岩屑回收，线性溶胀和傅里叶变换红外光谱（FTIR）。将硫胺素的性能与氯化钾进行了比较。与去离子水相比，硫胺素水溶液显示出更大的抑制蒙脱石（Mt）分散的能力，更多的Mt负载能力（280 g / L）和流体损失，更低的Mt质量损失，更大的Mt聚集颗粒，更低的中间层空间Mt颗粒的数量减少，页岩屑的分解减少，线性膨胀降低。硫胺素在Mt上的吸附导致zeta电位值发生明显变化（从-17.1到+8.54 mV）。硫胺素具有比氯化钾更好的抑制作用。FTIR分析证实硫胺素被吸附在Mt颗粒上。相容性测试表明硫胺素与常规WBDF添加剂的相容性。结论是，硫胺素的主要可能的抑制机理是阳离子交换和Mt表面涂层。鉴于其突出的抑制能力和极大的环境可接受性，硫胺素是在水敏感地层中钻井的有前途的抑制剂。相容性测试表明硫胺素与常规WBDF添加剂的相容性。结论是，硫胺素的主要可能的抑制机理是阳离子交换和Mt表面涂层。鉴于其突出的抑制能力和极大的环境可接受性，硫胺素是在水敏感地层中钻井的有前途的抑制剂。相容性测试表明硫胺素与常规WBDF添加剂的相容性。结论是，硫胺素的主要可能的抑制机理是阳离子交换和Mt表面涂层。鉴于其突出的抑制能力和极大的环境可接受性，硫胺素是在水敏感地层中钻井的有前途的抑制剂。