煤矿井下定向扩孔用PDC钻头的改型与应用

摘要

In order to solve the problem of short life of the Ream bit while secondary reaming in underground coal mine, in this paper, the authors analyzed the structural features of conventional PDC ream bits, studied the cutting principle of PDC ream bits, and remodeled the PDC ream drill from guide apparatus, blade wing, reverse cutting teeth and drill. The field tests show that, the remodeled ream bit has a single life above 800 meters, which can be used in directional high level borehole.%为了解决煤矿井下高位定向钻孔二次扩孔施工过程中出现的PDC扩孔钻头寿命低的问题,分析了常规PDC扩孔钻头结构特点,研究了PDC扩孔钻头的切削机理,并从导向器、刀翼、反向切削齿、钻头等方面对PDC 扩孔钻头进行了设计改型.现场试验表明,改型后的PDC扩孔钻头单只寿命达800m以上,能够很好地应用于高位定向钻孔扩孔.