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通过分析岩屑的分形破碎特征及钻井工况特点,应用分形岩石力学理论建立钻井工程能效评价模型,模型包括能耗评价模型和能效评价模型2个部分,目的在于研究钻井工程中破岩能耗及能效与岩屑分形破碎特征的关系。研究表明:岩屑粒度分布分形维数、最大粒径尺寸及岩石特性常数是破碎能耗的主要影响因素;水力净化系数、岩屑粒度分布分形维数是破岩能效的主要影响因素,分形维数越大能效就越高,水力净化系数越高能效就越高,影响规律呈现指数变化趋势,岩屑相邻粒度相似比对能效影响不大。
By analyzing fractal and fragmentation characteristics of drilling debris and characteristics of drilling conditions, fracturing rock mechanics theory is applied to establish drilling engineering energy efficiency evaluation model. The model includes energy consumption evaluation model and energy efficiency evaluation model. The purpose is to study the rock breaking energy consumption And the relationship between energy efficiency and the fractal and fragmentation characteristics of cuttings. The results show that fractal dimension, maximum particle size and rock characteristic constant are the main influencing factors of crushing energy consumption. The hydraulic purification coefficient and the fractal dimension of cuttings particle size distribution are the main influencing factors of rock breaking energy efficiency. Fractal dimension The higher the number is, the higher the energy efficiency is. The higher the water purification coefficient is, the higher the energy efficiency is, and the influence law shows an exponential trend. The similarity ratio between adjacent cuttings has little effect on energy efficiency.