Considering the stratum anti-drilling ability, drill bit working conditions, drill bit application effect and drill bit economic benefits, the similarity of stratum anti-drilling ability was evaluated by grey relational analysis theory to screen out candidate drill bits with reference values. A new comprehensive performance evaluation model of drill bit was established by constructing the absolute ideal solution, changing the relative distance measurement method, and introducing entropy weight to work out the closeness between the candidate drill bits and ideal drill bits and select the reasonable drill bit. Through the construction of absolute ideal solution, improvement of relative distance measurement method and introduction of entropy weight, the inherent defects of TOPSIS decision analysis method, such as non-absolute order, reverse order and unreasonable weight setting, can be overcome. Simple in calculation and easy to understand, the new bit selection method has good adaptability to drill bit selection using dynamic change drill bit database. Field application has proved that the drill bits selected by the new drill bit selection method had significant increase in average rate of penetration, low wear rate, and good compatibility with the drilled formations in actual drilling. This new method of drill bit selection can be used as a technical means to select drill bits with high efficiency, long life and good economics in oilfields.

考虑到地层的抗钻能力，钻头的工作条件，钻头的使用效果和钻头的经济效益，运用灰色关联分析理论对地层的抗钻能力进行了评价，以筛选出具有参考价值的候选钻头。通过构造绝对理想解，改变相对测距方法，引入熵权来建立候选钻头与理想钻头之间的紧密度，选择合理的钻头，建立了新的钻头综合性能评价模型。通过构造绝对理想解，改进相对距离测量方法和引入熵权，TOPSIS决策分析方法的固有缺陷，例如非绝对阶，可以克服相反的顺序和不合理的重量设置。这种新的钻头选择方法计算简单，易于理解，具有很好的适应性，可以利用动态变化的钻头数据库进行钻头选择。现场应用证明，通过新的钻头选择方法选择的钻头在平均钻进速度，低磨损率以及与实际钻井中与钻探地层的良好相容性方面有显着提高。这种新的钻头选择方法可以用作在油田中选择高效，长寿命和良好经济性的钻头的技术手段。现场应用证明，通过新的钻头选择方法选择的钻头在平均钻进速度，低磨损率以及与实际钻井中与钻探地层的良好相容性方面有显着提高。这种新的钻头选择方法可以用作在油田中选择高效，长寿命和良好经济性的钻头的技术手段。现场应用证明，通过新的钻头选择方法选择的钻头在平均钻进速度，低磨损率以及与实际钻井中与钻探地层的良好相容性方面有显着提高。这种新的钻头选择方法可以用作在油田中选择高效，长寿命和良好经济性的钻头的技术手段。