【摘要】 涡轮钻具作为重要的井下动力钻具，具有良好的发展前景，钻井液流变性对其输出性能具有十分重要的影响。将钻井液认定为非牛顿流体，利用五次多项式的方法对叶片的线型进行构造，基于四参数流变模式建立了本构方程，探究不同稠度系数、流动指数、密度的钻井液对涡轮内流场分布及输出性能的影响关系。通过正交试验、采用极差分析法，把涡轮的效率作为主要的评价因素，选取了效率最高的钻井液参数，分析得出各因素对效率影响的主次关系，其中密度影响大于稠度系数影响大于流动指数影响。将各因素与效率之间的相关性进行分析，得到效率与密度之间有显著的正相关关系，与稠度系数和流动指数之间存在负相关关系。研究结果可以反演涡轮叶片的优化设计，并可以为现场钻井液的选取提供依据。更多还原

【Abstract】 Turbodrill, as a key downhole motor, is promising for application.The rheological property of drilling fluid has a great influence on the output performance of turbodrill.Considering the drilling fluid as a non-Newtonian fluid, and using the quintic polynomial method to construct the blade profile, a constitutive equation was established based on the four-parameter rheological model to investigate the influences of drilling fluids with different consistency factors, fluidity indices and densities on the internal flow field distribution and output performance of the turbine.Through orthogonal test and range analysis, and from the prospective of turbine efficiency, the most efficient drilling fluid parameters were selected to analyze how the factors affect the turbine efficiency.It is found that density, consistency factor and fluidity index rank in a descending order of influence on the turbine efficiency.Finally, the correlation between factors and efficiency were analyzed, indicating that there is an obvious positive correlation between efficiency and density and a negative correlation between efficiency and consistency factor or fluidity index.The research results can be used to invert the optimization design of turbine blades and provide a basis for the field selection of drilling fluids.更多还原