To meet the increasing requirement of stabilizing shale under high‐temperature situation with the use of water‐based drilling fluids (WBDFs), the high‐performance shale stabilizer is an urgent need. In this study, an amphoteric copolymer of AM/DMDAAC/NVP (APC) was synthesized by acrylamide (AM), dimethyl diallyl ammonium chloride (DMDAAC), and N ‐vinylpyrrolidone (NVP) and used as a high temperature‐resistant shale stabilizer. The Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy confirmed the successful synthesis of APC. The inhibitive performance of APC was systematically evaluated and compared with three other commonly used shale stabilizers, including the anionic potassium polyacrylamide (KPAM), cationic poly dimethyl diallyl ammonium chloride (PD), and amphoteric polymer FA367. The results demonstrated that APC displayed excellent performance on the linear swelling test, hot‐rolling recovery experiment, and shale immersion test. Furthermore, APC combined the advantages of high shale recovery percentages of PD and maintaining shale pellet integrity of KPAM, avoiding the drawbacks of enormous filtration volume of PD and low shale recovery percentages of KPAM. These great properties indicated that APC would be suitable as a shale stabilizer in WBDF to drill high‐temperature shale formation.

中文翻译：

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在水基钻井液中合成两性聚合物作为耐高温页岩稳定剂

为了满足通过使用水基钻井液（WBDF）在高温条件下稳定页岩的不断增长的需求，迫切需要高性能的页岩稳定剂。在这项研究中，AM / DMDAAC / NVP（APC）的两性共聚物是由丙烯酰胺（AM），二甲基二烯丙基氯化铵（DMDAAC）和N合成的乙烯基吡咯烷酮（NVP），用作耐高温页岩稳定剂。傅里叶变换红外光谱和核磁共振光谱证实了APC的成功合成。系统地评估了APC的抑制性能，并将其与其他三种常用的页岩稳定剂进行了比较，其中包括阴离子聚丙烯酰胺钾（KPAM），阳离子聚二甲基二烯丙基氯化铵（PD）和两性聚合物FA367。结果表明，APC在线性溶胀试验，热轧恢复试验和页岩浸没试验中显示出优异的性能。此外，APC结合了PD的高页岩采收率和保持KPAM的页岩颗粒完整性的优点，避免了PD过滤量大和KPAM页岩回收率低的缺点。这些优异的性能表明，APC适合作为WBDF中的页岩稳定剂，用于钻探高温页岩地层。