Drilling device and drilling method for downhole pneumatic rock crushing foam slag discharge

Abstract

The invention discloses a drilling device and a drilling method for downhole pneumatic rock crushing foam slag removal, which comprises sequentially connected hammer heads, pneumatic impactors, double-wall jet joints, double-wall drill pipes and double-wall air blowers, and The air pipe at the rear end of the double-wall air blower and the water pipe on the side of the double-wall air blower; the double-wall spray joint, double-wall drill pipe and double-wall air blower are all double-layer structures, and the axes of the three are sealed The gas passage is connected to the air pipe; the three double-layer structures are mutually sealed and communicated annular passages, and one end of the annulus passage is sealed and connected with the water pipe, and the other end of the annulus passage passes through the The multiple nozzles on the outer tube body of the double-wall spray joint communicate with the outside to spray the liquid delivered to the nozzles to the outside of the outer tube body. The invention guarantees the impact energy and drilling efficiency through gas impact, and at the same time realizes gas-liquid mixing in the borehole to produce foam-wrapped rock powder, and adopts foam slag removal to effectively eliminate a large amount of dust generated during pneumatic impact drilling.

Description

technical field [0001] The invention belongs to the field of downhole hard rock drilling, and relates to a drilling device and a drilling method for downhole pneumatic impact rock crushing and foam slag discharge, and is a construction method for outputting crushed rock and foam slag discharge and dust removal by using a pneumatic impactor. Background technique [0002] At present, when drilling underground coal mines to drill hard rocks, especially rocks with a hardness coefficient f>10 or more, the drilling efficiency of the rotary drilling method is extremely low, and the drill bits are worn out quickly and seriously; in order to improve efficiency, generally pneumatic impactors and hydraulic Drilling with a dynamic impactor. Among them, due to the large impact energy, good rock breaking effect, low product price, and good matching of gas compressors, the pneumatic impactor has been widely used at present; , there is a problem of large dust pollution, resulting in poo...

AI Technical Summary

Problems solved by technology

Among them, due to the large impact energy, good rock breaking effect, low product price, and good matching of gas compressors, the pneumatic impactor has been widely used at present; , there is a problem of large dust pollution, resulting in poor construction environment

The hydraulic impactor is used for construction, the liquid impacts the work, and there is no dust pollution problem, but the price of the high-pressure hydraulic impactor itself is relatively high; and in order to obtain a large impact work, the pressure of the driving liquid (water) is required to be high and the flow rate is large. The performance requirements of the water pump are high, the rated pressure of the water pump is required to reach more than 10 to 20 MPa, the flow rate is required to be 200-350L / min, the price of the water pump is also high, and the overall cost performance in the application is not high

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