Method for improving shock absorption effect and stability of downhole drilling tool and downhole drilling tool

The invention discloses a method for improving the shock absorption effect and stability of a downhole drilling tool and the downhole drilling tool. The method is characterized in that a hydraulic shock absorber is arranged between a lower connector and a spindle, to eliminate or relieve the up-and-down vibration caused by bit jumping; stabilizers are arranged on the outside of the hydraulic shock absorber and on the lower connector, to prevent borehole deflection caused by lateral displacements of the drilling tool. According to the invention, by improving the structure of the downhole drilling tool, the two-way hydraulic shock absorber, the drill string stabilizer and the near-bit stabilizer are integrated to one drilling tool ingeniously, the structure of the drilling tool is simplified, bit jumping and vibration are overcome, and a near-bit drill string can be guaranteed to be kept stably in the middle under the effects of torque and bending moment. In the drilling process, the drilling speed and the quality of a well bore can be improved, and the drilling cost can be reduced. By applying the method for improving the shock absorption effect and stability of the downhole drilling tool and the downhole drilling tool, damage to the drilling equipment caused by the vibration can be effectively avoided or reduced, instability caused by the bending moment of the drill string can be overcome, the service life of a bit is greatly prolonged, the quality of the well bore is guaranteed, the drilling speed is improved, and the drilling cost is lowered.