油基钻井液用纳米材料CQ-NZC的封堵性能评价

摘要

封堵性是油基钻井液的一个重要评价指标，提高油基钻井液的封堵性有助于井壁稳定，促进快速安全钻井。本文通过使用砂芯漏斗来模拟页岩的微裂缝，建立了一种新的评价油基钻井液封堵性能的方法，利用该方法对自制的纳米材料 CQ-NZC 在钻井液封堵性及其与氧化沥青封堵剂的复合作用开展了实验研究。结果表明， CQ-NZC 在与沥青类封堵剂复配使用时，能够更好地降低滤失量、提高封堵性能。通过微观形态分析发现， CQ-NZC与沥青类封堵剂可以在一定程度上聚结，形成堵孔粒子，提升了钻井液体系的封堵性能。%The sealing characteristics is an important evaluation index of oil-based drilling fluids. Improving the plugging ability of oil based drilling fluids favors hole stability and fast drilling safety. A new method has been established to evaluate the sealing characteristics by using sand core funnel simulating micro-fracture. Experiment results have shown that the addition of nano materials CQ-NZC can make permeability lower and have good performance on plugging. The micro morphology analysis has been used to study the mechanism. The experiment results indicated that CQ-NZC and asphalt plugging agent agglomerated together partly to form hole plugging particles which contributed to the improvement of plugging ability.