A novel vibration drilling tool used for reducing friction and improve the penetration rate of petroleum drilling

A novel self-resonating oscillator which can be used for reducing the friction between drill-pipe and borehole wall and improving the rate of penetration is proposed. Several key issues of this tool are discussed in this paper, including the structure and principle of the modulating tool, the modulation mechanism of the vibration, the optimization method and the optimal structural parameters of the modulating tool. An engineering prototype is developed based on the above research works and site conditions. Field tests of the prototype are performed. The application effect is compared with actual drilling data of adjacent wells in the same formation and interval. The results are a good reference for the subsequent drilling.