多苯基芳基硅烷偶联剂改性纳米SiO2封堵剂

Nano-silica dioxide plugging agent modified by polyphenyl aryl silanes coupling agent

  褚奇 孔勇 杨帆 邱在磊 刘四海 李秀云

 （中国石化石油工程技术研究院，北京 100101）

 (Research Institute of Petroleum Engineering, SINOPEC, Beijing 100101, China)

 以工业纳米SiO2为原料，四苯基苄基三乙氧基硅烷为表面改性剂，氨水为催化剂，制备了一种改性纳米SiO2。借助激光粒度分析仪、透射电镜（TEM）、六速流变仪和滤失仪，对比了改性前后纳米SiO2在钻井液中的粒度分布和微观形貌特征，以及对钻井液流变性能和滤失性能的影响。通过模拟地层渗透率测试实验，评价了不同纳米SiO2对纳微米孔隙的封堵能力。实验结果表明：经140 ℃老化16 h后，钻井液中的工业纳米SiO2发生了明显的团聚现象，而改性纳米SiO2相反；2种纳米SiO2对钻井液的流变性能影响较小，但改性纳米SiO2可以显著降低钻井液的滤失量；与工业纳米SiO2相比，改性纳米SiO2可有效对纳微米裂隙进行封堵，当其在钻井液中的质量分数为3.0%时，对模拟纳微米孔隙地层的封堵率达到98.93%。

 A modified nano-silica was synthesized with industrial nano-silica, tetraphenylbenzyltriethoxysilane as surface treating agent, and ammonia as catalyst. Using Laser Particle Size Analyzer, Transmission Electron Microscopy(TEM), Six-speed Electronic Rheometer and Filtration Apparatus, the particle size distribution, micro-morphological features, rheological behavior and filtration properties of industrial nano-silica and surface modified nano-silica were compared. The plugging ability for micro-facture formation was further tested via permeability of simulated formation test. The results show that the industrial nano-silica is prone to agglomerate in drilling fluid after thermal aging at 140 ℃ for 16 hours, while the surface modified nano-silica is just the opposite. Two kinds of nano-silica have little effect on the rheological properties of drilling fluid. However, the surface modified nano-silica can significantly reduce the filtrate volume of drilling fluid. In contrast with industrial nano-silica, the surface modified nano-silica shows stronger plugging ability for simulated nano-micron pore formation. When the mass concentration of surface modified nano-silica is 3.0%, the plugging rate of micro-facture formation can achieve 98.93%.

10.6056/dkyqt201702032