The invention belongs to the
oil well drilling field and particularly relates to a particle
jet flow-based
drill bit for impacting and breaking rocks. The
drill bit comprises a
drill bit body, a
drill bit blade, a
nozzle jacket, inner nozzles and
cutting teeth. The internal upper part of the
drill bit body is provided with a
drill bit inner cavity. The bottom of the drill bit inner cavity is provided with a
nozzle flow path in communication with the drill bit inner cavity. The bottom of the
nozzle flow path passes through the drill bit body. The nozzle flow path comprises a nozzle upper flow path and a nozzle lower flow path. The inner nozzles are arranged in the nozzle lower flow path. The nozzle jacket is arranged between the inner nozzles and the nozzle lower flow path. The
tail end of the nozzle jacket is exposed out of the bottom of the drill bit body. The drill bit body is internally provided with three inner nozzles and the diameters of the inner nozzles are differed in stages. According to the technical scheme of the invention, the
rock breaking efficiency of the drill bit is effectively improved, and the mechanical drilling rate during the
petroleum drilling process is increased. Meanwhile, the deflection of the drill bit during the
well drilling process is avoided. By means of the special particle
jet flow-based drill bit for impacting and breaking rocks, not only the mechanical drilling rate of a roller bit is increased, but also the well deflection is effectively prevented at the same time.