凸包型仿生耦合金刚石钻头模拟分析

Simulation Analysis on Bionic Coupling Diamond Bit with Convex Domes

摘要:

研究发现仿生耦合钻头较普通钻头钻进时效提高很多。仿生耦合钻头一方面能使钻头唇面有较高的比压；另一方面能使钻头具有很好的冷却效果，因此在钻探工程中有很好的应用前景。应用数值模拟软件ansys，模拟分析了凸包型非光滑表面对金刚石钻头性能的影响。对比分析了4种不同非光滑度状况下，钻头在一定的钻压作用下在岩石表面产生滑动摩擦的过程。主要分析了该过程中岩层的等效应力、钻头底唇面的接触摩擦应力和接触压力的变化规律。研究发现，凸包型非光滑表面在一定程度上可以提高钻头的使用寿命和钻进效率。

Abstract:

It was found that bionic coupling bits have higher drilling efficiency than ordinary drill bits by study. On the one hand, bionic coupling bits with higher pressure on the bottom lip surface; on the other hand, it improves the cooling condition. So it has a good prospect in drilling engineering. In this paper, the numerical simulation software ansys was used to analyze the impact of the convex and non-smooth surface on the performance of diamond bit. Comparison was made on the process of drill bits sliding friction on the rock surface with certain pressure under 4 different non-smoothness conditions. Analysis was made mainly on the variation of rock’s equivalent stress, contact friction stress and contact pressure on the bottom lip surface of bit. The convex and non-smooth surface can increase the service life and drilling efficiency of drill bit.