A self-rotating drilling tool for air reverse circulation down-the-hole hammer for directional drilling

Abstract

The invention relates to the technical field of drilling equipment, in particular to an air reverse circulation down-the-hole hammer self-rotating drilling tool for directional drilling, which includes a shell, an air distribution mechanism, a rotary mechanism and a drill bit, and the air distribution mechanism, the rotary mechanism and the drill bit Installed in the casing from top to bottom; the gas distribution mechanism includes a valve assembly, a piston assembly with a front air chamber and a rear air chamber, and the movable end of the piston assembly is provided with an oblique key to cooperate with the spiral bushing contained in the rotary mechanism The helical bushing is connected to the drill bit through the spline sleeve interlocking with it intermittently; the valve assembly controls the gas flow into the front air chamber and the rear air chamber alternately to drive the movable end to reciprocate and drive the drill bit to rotate. Beneficial effects: all mechanisms are installed inside the shell, relying on the wedge-shaped teeth included in the slewing mechanism to cooperate with the keyway to transmit torque, the structure is compact, and the strength is reliable; the return energy of the keyed piston is used to drive the drill bit to rotate and grind rocks, and the stroke of the keyed piston is maintained The energy impact breaks the rock, and the energy utilization rate is high.

Description

Technical field [0001] The present invention relates to the technical field of drilling equipment, in particular a directional drilling air anti-circulation sub-hammer from the rotary drill. Background technique [0002] Pneumatic anti-circulating sub-hammer drilling technology is an efficient, economical drilling method, widely used in geological core drilling, hydrological water well drilling, basic engineering construction, oil and gas resource mining, etc. Good quality, low gas consumption, high sampling rate, prevent layers from leakage, and have advantages such as environment-free pollution, which can effectively reduce the cost of drilling and improve construction efficiency. [0003] However, since the pneumatic pore hammer requires a drill rod to drive its rotation, it is impossible to directly use the orientation tool, so it is difficult to accurately detect and control the wellbore trajectory, and cannot be directly used for the directional hole construction, and can o...

AI Technical Summary

Problems solved by technology

[0003] However, because the pneumatic DTH hammer needs the drill pipe to drive its rotation, it cannot directly use directional tools, so it is difficult to accurately detect and control the wellbore trajectory, and it cannot be directly used for directional hole construction. It can only be combined with pneumatic screw drilling tools. drill into

[0004] However, the pneumatic screw drilling tool has high speed and long size, which increases the complexity of the process and has low reliability, which cannot give full play to the technical advantages of the pneumatic DTH hammer.

In addition, the existing pneumatic DTH hammer uses the drill pipe to rotate through the surface drilling rig. When used in directional wells or horizontal wells, there are technical problems such as small torque and difficult application of drilling pressure, which limits its popularization and application in this field.

Images