Abstract: Improving the drilling rate of hard formation is always a problem in the world. At present ,in order to actualize rapid drilling through hard formation, people mainly apply various new drilling techniques, improve rock-breaking tools of hard formation in deep well, optimize drilling technology and apply some modern rock-breaking technologies, but the effect is not full ideal. The particle impacts drilling technology has gone through from indoor experimental stage to field experimental stage when it comes out, and now it is striding into the stage of industrial application. According to the full operation of the technology, the advantages and disadvantages of the technology is described. This method changes the way of traditional cutting formation and improves the rate of drilling hard formation, but to the ground-based devices and down-hole rock bits there still exist some problems which need to be solved. The technology represents the trend of efficient drilling hard formation. In the east and west China, there are lots of sedimentary basins in which the bedrocks are igneous rocks. The technology probably become a new method of drilling deep well hard formation efficiently and economically.

Key words: particle impact drilling, rock breaking, drilling rate, hard formation, rock bit