Jet suction ball valve type pulse vibration well drilling tool

The utility model relates to a jet suction ball valve type pulse vibration well drilling tool which is composed of a driven coupling pup joint of a drill bit, a coupling sleeve, a valve ball, a hydraulic oscillator, a casing, a drilling string coupling pup joint, etc. The utility model is characterized in that the driven coupling pup joint of a drill bit is matched with the casing at the lower end of the casing; the upper end and the lower end of the driven coupling pup joint of a drill bit are respectively connected with the coupling sleeve and the drill bit; a tapered valve seat is arranged at the middle part of the coupling sleeve; the valve ball is arranged in a cavity on the upper end of the coupling sleeve; the upper end of the coupling sleeve is connected with the hydraulic oscillator; the upper end of the casing is connected with a drilling string by the drilling string coupling pup joint. The utility model has the theory that a hydraulic oscillating element is used for modulating, sucking and jetting the valve ball to periodically block a passage of drilling fluid, which generates hydraulic pulsation acted on the drill bit. Thus, the drill bit generates oscillation; meanwhile, the hydraulic pulsation of the drilling fluid is downward propagated to a bottom hole, so the flow field of the bottom hole also generates pulsation; the combined action of the vibration of the drill bit and the hydraulic pulsation of the flow field of the bottom hole enables the stress conditions of rocks nearby the drill bit and the bottom hole to be obviously improved. Thus, the drilling efficiency of the drill bit for breaking the rocks is effectively raised.