Influence of Drilling Fluid Solid Phase on Performance of Downhole Turbogenerator
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摘要: 井下涡轮发电机是常见的井下供电电源之一,钻井液固相会对井下涡轮发电机的性能产生影响。利用Fluent软件,基于Eulerian多相流模型,对涡轮发电机进行三维数值模拟,研究了钻井液固相含量、固相粒径、固相密度对井下涡轮发电机的性能影响。仿真结果表明:随着固相含量增加,涡轮发电机的压降、扭矩、输入输出功率及效率增加;随着固相粒径的增加,涡轮发电机的压降、扭矩、输入输出功率先增加后趋于稳定,效率逐渐增加但增幅减小;随着固相密度增加,涡轮发电机的压降、扭矩、输入输出功率及效率近似呈线性增加,效率增加但增幅逐渐变小。Abstract: Downhole turbogenerator is one of the most common downhole power supply. Solid phase of drilling fluid will affect the performance of downhole turbogenerator. Based on Eulerian multiphase flow model and Fluent software, three-dimensional numerical simulation of the downhole turbogenerator is carried out. The effects of the solid content, particle size and solid density of drilling fluid on the performance of downhole turbine generator are studied. The simulation results show that the pressure drop, torque, input and output power and efficiency of the turbogenerator increasewith the increasing of solid phase content, the pressure drop, torque, input and output power of the turbogenerator increase firstly and stabilizewith the increasing of solid particle size, while the efficiency increases gradually with the increasing of solid particle size, the pressure drop, torque, input and output power and efficiency of the turbogenerator increase linearlywith the increasing of solid density and the increase in efficiency decreases gradually with the increasing of solid particle size.
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Key words:
- turbogenerator /
- numerical simulation /
- Eulerian model /
- drilling fluid solid phase /
- efficiency
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表 1 井下涡轮叶片基本参数
参数 数值 参数 数值 外径/mm 76 螺旋升角/(°) 45 内径/mm 60 叶高/mm 15 叶片轴长/mm 70 整体轴长/mm 144 叶片数目/个 11 叶片厚度/mm 4 表 2 井下涡轮发电机仿真方案
方案 固相含量/% 固相粒径/μm 固相密度/(kg·m−3) 1 2, 6, 10, 14, 18 40 4200 2 6 1, 20, 40, 60, 80 4200 3 6 40 3400, 3800, 4200,
4600, 5000 -
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