Application of core-shell structural acrylic resin/nano-SiO2 composite in water based drilling fluid to plug shale pores

作者：Huang, Xianbin^*; Sun, Jinsheng; Lv, Kaihe; Liu, Jingping; Shen, Haokun; Zhang, Fan

来源：Journal of Natural Gas Science and Engineering, 2018, 55: 418-425.

DOI：10.1016/j.jngse.2018.05.023

• Plugging agent
• Shale
• Core-shell
• Acrylic resin
• Nano-SiO2
• Drilling fluid

Integrating the advantages of inorganic and polymeric nanoscale plugging agents, this paper introduced the synthesis of a nanoscale acrylic resin/nano-SiO2 composite (AR/SiO2) with a core-shell structure for water based drilling fluid (WBM), which can enhance the plugging efficiency of shale pores, reduce fluid invasion and improve wellbore stability in shale gas drilling process. The core-shell structure of AR/SiO2 was characterized by transmission electron microscope (TEM). Thermal Gravity Analysis (TGA) indicated the thermal resistance of AR/SiO2 up to 250 degrees C. Theoretical analysis implied that improved plugging property of AR/SiO2 might be due to good adhesion of deformable shell parts with shale matrix and the supporting provided by rigid core parts. The plugging ability was evaluated by pressure transmission tests and N-2 adsorption tests. The results demonstrated that WBM containing AR/SiO2 can substantially enhance plugging efficiency and reduce fluid invasion. Characterization of filter cakes revealed that AR/SiO2 improved the quality of filter cakes, which resulted in a considerable improvement in filtration properties.

• 出版日期2018-7
• 单位中国石油大学（华东）