Noor Abdullahi Ahmed, Khan Muhammad Arqam, Zhang Yaxuan, Lv Kaihe, Sun Jinsheng, Liu Chaozheng, Li Mei-Chun
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China.
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China; Department of Petroleum Engineering, NED University of Engineering & Technology, Pakistan.
Int J Biol Macromol. 2025 Jan;287:138556. doi: 10.1016/j.ijbiomac.2024.138556. Epub 2024 Dec 8.
Drilling fluids are often referred to as the "blood" of the drilling process, as they play a crucial role in determining both the efficiency and safety of drilling operations. Natural polymers, derived from renewable sources, such as cellulose, lignin, chitosan, xanthan gum, and starch, offer inherent advantages such as sustainability, biodegradability, and environmentally-friendliness when used as additives in drilling fluids. However, the inherent properties of natural polymers are adversely affected by thermal degradation due to their low heat resistance under harsh drilling conditions, where temperatures can exceed 150 °C. To address these challenges, various modification techniques, including free radical polymerization, esterification, etherification, silanization, hydroxymethylation, and ionic crosslinking, have been employed. This paper provides an overview of recent advances in the application of modified natural polymers as additives in water-based drilling fluids (WBDFs) under high-temperature drilling conditions. It begins by discussing the degradation mechanisms of natural polymers at high temperatures, followed by a review of the techniques used for their modification. Subsequently, the application of modified natural polymers as rheological and fluid loss additives in high-temperature WBDFs is briefly presented. Finally, the challenges, environmental impacts, and future considerations for the use of modified polymers are outlined to guide future development of environmentally friendly, high-performance WBDFs.
钻井液常被称为钻井过程的“血液”，因为它们在决定钻井作业的效率和安全性方面起着至关重要的作用。天然聚合物来源于可再生资源，如纤维素、木质素、壳聚糖、黄原胶和淀粉，当用作钻井液添加剂时，具有可持续性、生物降解性和环境友好性等固有优势。然而，由于在温度可能超过150°C的恶劣钻井条件下耐热性较低，天然聚合物的固有性能会受到热降解的不利影响。为应对这些挑战，人们采用了各种改性技术，包括自由基聚合、酯化、醚化、硅烷化、羟甲基化和离子交联。本文概述了改性天然聚合物在高温钻井条件下作为水基钻井液（WBDF）添加剂应用的最新进展。首先讨论了天然聚合物在高温下的降解机制，接着综述了用于其改性的技术。随后，简要介绍了改性天然聚合物在高温水基钻井液中作为流变和滤失添加剂的应用。最后，概述了使用改性聚合物的挑战、环境影响以及未来考虑因素，以指导环保型高性能水基钻井液的未来发展。
