To develop a green drilling fluid additive, the modification and application of persimmon peel in a water-based drilling fluid was studied in this work. A natural product derivative, aluminium chloride–persimmon peel (ACPP), was prepared from aluminium chloride and persimmon peel and was assessed as a shale inhibitor. The clay-swelling ratio in 0.30% ACPP-3 solution was reduced to 28.10% from 69.50%. The rolling recovery tests and rheological evaluation of drilling fluids concluded that ACPP-3 has a high inhibition property to montmorillonite-hydrated expansion. ACPP-3 can adjust the particle size of montmorillonite to a large degree. ACPP-3 effectively reduces the apparent viscosity of carboxymethyl cellulose drilling fluids and the volume of filtration; furthermore, ACPP-3 can reduce the viscosity and the volume of filtration under high temperature, which means it can be used as an additive for deep drilling. The inhibition mechanism of ACPP-3 was investigated by thermogravimetric analysis and scanning electron microscopy. The results of this scientific research will be beneficial to the eco-friendly drilling fluid materials.

中文翻译：

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废柿皮的改性及其在水基钻井液中的应用

为开发绿色钻井液添加剂，本文研究了柿皮在水基钻井液中的改性及应用。由氯化铝和柿子皮制备的天然产物衍生物氯化铝-柿子皮 (ACPP) 被评估为页岩抑制剂。0.30% ACPP-3 溶液中的粘土膨胀率从 69.50% 降低到 28.10%。钻井液的滚动采收率试验和流变学评价表明，ACPP-3对蒙脱石水合物膨胀具有较高的抑制作用。ACPP-3可以在很大程度上调节蒙脱石的粒径。ACPP-3有效降低羧甲基纤维素钻井液的表观粘度和过滤量；此外，ACPP-3在高温下可降低粘度和过滤体积，可用作深钻添加剂。通过热重分析和扫描电子显微镜研究了ACPP-3的抑制机制。该科研成果将有利于环保钻井液材料的发展。