The invention discloses a shaft bottom
particle injection drilling speed increasing tool and belongs to the field of matched devices of
petroleum and
natural gas drilling. The tool comprises an upper connector, a contracting
nozzle, a casing and a lower connector. The lower connector is connected with a
drill bit provided with a water hole. The contacting
nozzle is provided with a
nozzle channel, an annular space is formed between the contacting nozzle and the casing, the nozzle channel is communicated with the annular space, the casing is provided with a particle suction port, a conical
diffusion flowing channel is arranged on the lower connector, and the
diameter of the inlet position where the
diffusion flowing channel is communicated with the annular space is smaller than the
diameter of the outlet position where the
diffusion flowing channel is communicated with the water hole. In the drilling process, drilling liquid forms high speed injection flow through the contacting nozzle to be sprayed, a
low pressure area is formed in the annular space under the injection effect of the injection flow,
steelmaking particles in the annular space is sucked into the annular space through
pressure difference of
high pressure and low pressure, and the particle suction effect is improved.