The hydraulic oscillator improves the transmission of WOB during drilling through the longitudinal vibration generated by the hydraulic action of drilling fluid, and effectively reduces the friction between drilling tools and wellbore. In particular, it is a downhole tool to solve the pressure drop of the drill string at the bottom of the well and improve the transmission of WOB in the process of directional drilling. Stable WOB transmission improves the adjustment ability of the bit to drill to a further target layer. Keep the tool face stable during drilling and improve the ROP. It is especially suitable for horizontal wells and extended reach wells. It can be used with MWD, screw and any bit at the same time.
