煤矿井下硬岩定向钻进PDC钻头选型及试验分析

Selection of PDC Bit for Directional Drilling in Hard Rocks of Coal Mine and the Test Analysis

摘要:

为了提高煤矿井下硬岩定向钻进的效率，在分析硬岩定向钻进PDC钻头的结构要求的基础上，选择了3种不同类型的PDC钻头进行煤矿井下硬岩定向钻进试验。试验结果表明，平底型PDC钻头不适用于定向钻进硬岩，而三翼抛物线型钻头和四翼平角型钻头在定向钻进硬岩时，表现出长寿命、高效率等特点，适合于定向钻进硬岩地层，大大提高了煤矿井下定向钻进硬岩地层的效率。

Abstract:

Based on the analysis on the requirements of PDC bit structure, 3 different types of PDC bit were selected for hard rocks directional drilling tests in underground coal mine in order to improve the drilling efficiency. The test results show that the flat-bottom PDC bit is not suitable for directional drilling in hard rock, the three-wing parabolic PDC bit and the four-wing straight angle PDC bit show the adaptability in hard rock directional drilling with long service life and high efficiency.