Hydraulic Oscillators can effectively reduce the sliding drilling between the drilling tool and the wall friction and effectively improve the pressure transmission. It can Reduce down hole torsion, reduce lateral vibration and increase rate of penetrate. Directional drilling efficiency can be greatly improved, you can drill a smoother well bore. Hydraulic oscillator can be used for vertical wells, motor-oriented drilling, rotary steering drilling, large displacement wells shale gas reservoir drilling. It can also solve the the problems such as: backing pressure, slide block moving of the stem and poor controlling results caused by drill bit. This tool will greatly improve the directional drilling control and extend the drill bit’s service life.