现有粉液混配器存在的不足主要表现有:胍胶粉吸入不足,影响混合液黏度;混配过程中,粉包团的产生影响了压裂液质量.结合环形射流原理,设计一种新型粉液混配器,并搭建试验设备.粉液混配器的主要结构包括基液输送管、粉末吸出管、粉液混合管和混合腔等.建立粉液混配器的混合模型进行数值模拟,并进行正交试验,对混配器结构进行优选.结果表明,流体流经加速区域产生的负压约为0.0874 MPa,固液两相混合均匀.按照优选的结构尺寸得到的负压可达0.0728 MPa,能达到理论值的83.3%,且压裂液中无粉包团产生,压裂液各项参数均符合要求,很好地达到动态混配效果.%The main problems existing in powder liquid mixers are that: Firstly, the intake of guanidine powders is insuffi-cient,which affects the viscosity of the mixture. Secondly,in the mixing process,the production of solidified powders affects the quality of the fracturing fluid. Combined with the annular jet principle,a new powder liquid mixer is designed and the re-lated experimental equipment is built. Its main structure includes the conveying duct of base fluid,suction pipe of powders, mixer tube of powder-liquid and mixer etc. A powder-liquid mixer model is built for numerical simulations,and the orthogo-nal experiment is performed. Finally,the structure of the mixer is optimized. The simulation results show that the negative pressure generated by the fluid flowing through the acceleration zone is about 0.087 4 MPa,and the solid and liquid phases can be mixed evenly. Moreover,the negative pressure value produced by the optimized structure is up to 0.072 8 MPa,and it can reach 83.3% of the theoretical value. Also,there are no solidified powders in the fracturing fluid. All parameters of the fracturing fluid can satisfy the requirements,and the mixer can achieve a good dynamic mixing effect.
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