采矿与安全工程学报Issue(4)：621-627,7.
磨料射流联合机械齿提高硬岩钻进效率研究
Combined drilling of hard rock with abrasive water jet and mechanical bit to improve drilling efficiency
摘要
Abstract
A dense “boss” in the hole bottom by the conventional drilling in the hard rock requires a more efficient drilling technique with slow bit wear, a new kind of hard rock combined drilling method with the abrasive water jet and mechanical bit is developed in this paper. In this method, it is proposed to introduce the abrasive water jet to erode the “boss” for a “pilot hole”, and then the drilling mechan-ism of conventional rotating bit is changed to improve the hard rock drilling efficiency. Meanwhile, the mechanism of the new drilling method to improve drilling efficiency in hard rock was revealed by using fracture mechanics theory and energy conservation principle. Moreover, by designing a hard rock breaking bit and a set of hard rock combined drilling equipment system, a series of comparative expe-riments between the new and conventional techniques were conducted. The results show that the drilling depth has increased by about 63%, the axial force and torque have reduced by about 15% and 20% re-spectively, and the bit wear is reduced significantly.关键词
硬岩/钻孔/磨料射流/机械齿/联合破岩/钻进效率Key words
hard rock/drilling/abrasive water jet/mechanical bit/combined breaking rock/drilling efficiency分类
矿业与冶金引用本文复制引用
..磨料射流联合机械齿提高硬岩钻进效率研究[J].采矿与安全工程学报,2013,(4):621-627,7.基金项目
中央高校自然科学类基金重大项目(CDJZR12248801)；国家自然科学基金项目(51104191)；重庆市自然科学基金项目(cstcjjA90004) （CDJZR12248801）
