Equipment and technique for improving penetration rate by the transformation of drill string vibration to hydraulic pulsating jet

To improve the down-hole drilling fluid energy and its utilization efficiency, a drilling string absorption and hydraulic pulsed jet generator was designed, its simulation model was established and simulation analysis was conducted, and its performance was tested in field application. Based on the idea of translating the energy of the drill string vibration into high pressure hydraulic pulsating jet energy, the structure of the device was designed and its working principle was analyzed, and then its simulation model was established. The simulation analysis results demonstrate that the device can produce the jet pressure 2 to 6 MPa higher than the nozzle pressure drop in conventional drilling. Field test results show that the device can improve the drilling speed significantly and extend the service life of the bit effectively; the device itself has steady performance and long service life, and can satisfy the drilling requirements.