精细石油化工

针对低渗油藏注水开发过程中注水井水驱压力不断升高、注水量欠注严重等问题，采用KH570改性纳米二硫化钼，以CTAB为分散剂制备了一种新型纳米增注剂，评价了其团聚粒径、界面张力、润湿性、长期稳定性及降压增注性能。结果表明：当改性纳米二硫化钼质量分数为0.5%、CTAB质量分数为5%时，可制得溶液平均粒径在90nm的增注剂。在增注剂加量为0.3%时，界面张力降至9.5×10~-3mN/m，石英砂片接触角从40°增至93°，显著改善界面性质与润湿性；对天然岩心注入0.6PV，后续水驱压力下降32.87%，降压效果优于纳米SiO₂增注剂(降压率25.6%)。

Aiming at the problems of continuously increasing water flooding pressure and serious insufficient injection dur-ing the water flooding development of low-permeability reservoirs, a new type of nano injection enhancer was prepared by modifying nano molybdenum disulfide with KH570 and selecting CTAB as the dispersant. Its agglomerated particle size, interfacial tension, wettability, long-term stability, pressure-reducing, and injection-enhancing performance were evalu-ated through experiments. The results show that when the mass content of modified nano molybdenum disulfide is 0.5% and the mass content of CTAB is 5%, an injection enhancer with an average particle size of 90 nm can be prepared. When the dosage is 0.3%, the interfacial tension decreases to 9.5×10-3 m N/m, and the contact angle of quartz sand increases from 40° to 93°, significantly improve the interfacial properties and wettability. After injecting 0.6 PV of the injection enhancer into the natural core, the subsequent water drive pressure decreases by 32.87%, with a better pressure reduction effect than the nano-SiO₂ injection enhancer(with a pressure reduction rate of 25.6%).