Nanoplugging materials are used in drilling fluid systems to seal nanopores and cracks in the shale formation, which is a focus for developing shale gas. In this work, nanoparticles of the St-NaSS copolymer were synthesized by emulsion polymerization of styrene and styrene sulfonic acid sodium salt as monomers. The St-NaSS copolymer was characterized by FT-IR, TGA, and light scanning phase analysis. The results show that the grain size of the St-NaSS copolymer nanoparticles ranges from 37 to 50 nm, and the average diameter is about 43.2 nm. The decomposition temperature of the St-NaSS copolymer is 410.7°C, indicating that the material has good temperature resistance. The St-NaSS nanoparticles have little effect on the rheological properties of the water-based drilling fluid. The plugging performance of the St-NaSS nanoparticles was evaluated by the mud cake simulation method. The permeability of the mud cake is 3.32×10-5 μm² which is close in value to that of the shale. When the drilling fluid contains 0.5 wt.% of St-NaSS nanoparticles, the plugging rate is 88.93%. The plugging rate of the mud cake increases with increase in the concentration of the St-NaSS nanoparticles. When the amount of rho St-NaSS nanoparticles is 1.0% the plugging effect of the drilling fluid is excellent. Therefore, St-NaSS copolymer nanoparticles can be successfully applied as a plugging agent to provide borehole stability in the shale formation.

纳米堵漏材料用于钻井液系统中，以密封页岩地层中的纳米孔和裂缝，这是开发页岩气的重点。在这项工作中，通过苯乙烯和苯乙烯磺酸钠盐作为单体的乳液聚合反应，合成了St-NaSS共聚物的纳米颗粒。通过FT-IR，TGA和光扫描相分析对St-NaSS共聚物进行了表征。结果表明，St-NaSS共聚物纳米颗粒的粒径为37至50nm，平均直径为约43.2nm。St-NaSS共聚物的分解温度为410.7℃，表明该材料具有良好的耐热性。St-NaSS纳米颗粒对水基钻井液的流变特性影响很小。通过泥饼模拟方法评价了St-NaSS纳米颗粒的堵塞性能。泥饼的渗透率为3.32×10-5μm^2的价值与页岩相近。当钻井液包含0.5wt。％的St-NaSS纳米颗粒时，堵塞率为88.93％。泥饼的堵塞率随St-NaSS纳米颗粒浓度的增加而增加。当rh St-NaSS纳米颗粒的量为1.0％时，钻井液的堵漏效果极好。因此，St-NaSS共聚物纳米颗粒可以成功地用作堵漏剂，以在页岩地层中提供井眼稳定性。