Multi-directional jet pneumatic down-the-hole hammer drill bit

Abstract

The invention discloses a multi-directional jet pneumatic down-the-hole hammer drill bit. The multi-directional jet pneumatic down-the-hole hammer drill bit comprises a pressure head, a ring-cavity single stable fluidic element, a drill bit body and a nozzle. The ring-cavity single stable fluidic element is packaged in the drill bit body by the pressure head. The interior of the pressure head is provided with passages communicated with a ring-cavity single stable fluidic element nozzle and a ring-cavity single stable fluidic element control channel. The ring-cavity single stable fluidic element is built in the drill bit body, and uses an asymmetrical design of a single control channel. The lengths of shoulders positioned at two sides of the ring-cavity single stable fluidic element nozzleare different. The length of the table shoulder, adjacent to the control channel, at one side is less than the length of the table shoulder at the other side, so compressed air can be stably attachedto the wall at one side. The control channel is an annular structure. A wedge of the lower end of the ring-cavity single stable fluidic element is welded on the drill bit body. An inclined jeting nozzle and a radial jeting nozzle are connected to two outlets of the ring-cavity single stable fluidic element. The rock waste cleaning effect of fluid jet by the down-the-hole hammer drill bit nozzle isgood, and the drilling efficiency is improved.

Description

technical field [0001] The invention relates to a drilling tool, in particular to a multi-directional jet pneumatic down-the-hole hammer drill bit. Background technique [0002] In order to ensure that the impact energy of the hammer can be transmitted to the bottom of the well, the pressure at the inlet of the drill bit of the pneumatic down-the-hole hammer is often low to avoid the adverse effect of fluid back pressure on the impact movement of the hammer. The low nozzle inlet pressure and the leakage at the spline joint of the drill bit make the fluid ejected from the nozzle of the down-the-hole hammer bit less effective in removing cuttings. When drilling too fast, a large number of cuttings are suspended in the hole, and jamming often occurs In-hole accidents such as drilling and buried drilling. In water-bearing wet formations, down-the-hole hammer drill bits often cause drill bits to pack due to debris accumulation. The removal of cuttings requires two processes of ...

AI Technical Summary

Problems solved by technology

The removal of cuttings requires two processes of suspension and migration. Conventional inclined nozzles can suspend cuttings well, but the radial fluid velocity is low, which is not conducive to the migration of cuttings; the flow velocity at the bottom of radial nozzle holes is high, which is conducive Cuttings migration, but less ability to initiate and suspend cuttings

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