Drill bit short joint capable of generating water hammering pressure pulsation under well

The utility model discloses a drill bit short joint capable of generating water hammering pressure pulsation under well, comprising a shell, a converting connector, an injection nozzle, an upper inner tube, a lower inner tube, a connecting sleeve, a drill driving bit short joint, a piston, a bulkhead, a bulkhead bearing base, etc. The utility model is characterized in that the drill driving bit short joint is matched with the shell at the lower end of the shell, and the upper end and the lower end of the drill driving bit short joint are respectively connected with the connecting sleeve and a drill head. The lower inner tube is matched with the connecting sleeve, and the upper end of the lower inner tube is provided with the bulkhead bearing base. The lower part of the upper inner tube is provided with the components comprising the cylinder sleeve, the piston, the bulkhead, etc. The lower end of the converting connector is provided with the injection nozzle, and the upper end of the converting connector is connected with a drill post. The operating principle of the tools is the use of Bernoulli effect. The channel of the drilling fluid is periodically blocked by the bulkhead to form a water hammering pressure acting on the drill head, and a mechanical oscillation is generated by the drill head. Simultaneously, the water hammering pressure is downward transmitted to the well bottom, and a pulsation is generated at the flow field of the well bottom. The stress condition of the drill head and the rock near the well bottom is visibility improved under the combined action of the mechanical oscillation of the drill head and the hydraulic pulsation of the flow field of the well bottom, and the rock-breaking drilling efficiency of the drill head is effectively improved.