Field Test of Self-Excited Vibration Rotary Percussion Drilling Tool in Deep and Ultra-Deep Wells

Self-excited vibration rotary percussion drilling tool was developed according to the principle of adjusting hydraulic pulse to cause the bit vibration for solving the problem of low penetration rate in deep and ultra-deep wells.The performance parameters of the tool were tested by experiment,the results show that increase of pulsation and impact force generated by the tool with the rise of flow rate.It has been used in three deep and ultra-deep wells in Tahe Oilfield,the idea of self-excited vibration rotary percussion drilling tool is correct and feasible,the drilling tools can adapt a variety of bit types,lithologies,mud density and flow rates,resulting in the increase of penetration rate of 31.8%-80.5%.The tool features stable performance,simple operation,long service life and deferral of PDC bit wear,and can be popularized as an effective way to increase rate of penetration for deep and ultra-deep well drilling.