Dispensing drill pipe

Abstract

The invention discloses a dispensing drill pipe. The dispensing drill pipe comprises a pipe body. An air inlet passage and a pressure relief passage are formed in the pipe body along the pipe extending direction; a pressure relief valve is arranged in the pressure relief passage; a pressure relief hole matched with the pressure relief valve is formed in the pipe body. The dispensing drill pipe hasthe advantages that the pressure relief valve is arranged in the pressure relief passage, and the gas density at the bottom of a drill hole is reduced actively and timely during drilling when the internal pressure of the drill hole exceeds a pressure threshold, so that the gas is prevented from being out of limit, and accidents such as blasting and drill jamming are prevented and treated; the gasdensity in the drill hole can be reduced gradually, sudden movement of a large amount of gas is prevented, and accordingly, safety construction in drilling of coal beds can be effectively guaranteed.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a diversion drill pipe. Background technique [0002] In the process of drilling in coal seams, especially in high-gas soft outburst coal seams under high stress, coal and gas are easily ejected from the boreholes, which poses a great threat to the safety and efficient production of coal mines. The existing drill pipes do not have the function of active pressure relief. During the drilling process, the gas in the drilled hole is easy to accumulate and exceed the limit. The gas concentration in the drilled hole cannot be reduced in time and effectively, and it is easy to cause accidents such as injection holes and stuck drills. Hazardous to equipment and personnel. SUMMARY OF THE INVENTION [0003] The invention provides a diversion drill pipe, which can timely and actively reduce the gas concentration at the bottom of the hole during the drilling process and gradually redu...

AI Technical Summary

Problems solved by technology

[0002] In the drilling construction process of coal seams, especially in high-gassy soft outburst coal seams under high stress, it is very easy to eject coal and gas from the drilling holes, which poses a great threat to the safety and high-efficiency production of coal mines. None of the existing drill pipes has the function of actively releasing pressure. During the drilling process, the gas in the drilling hole is easy to accumulate and exceed the limit, and the gas concentration in the drilling hole cannot be effectively reduced in time, which easily causes accidents such as injection holes and drill sticking. Hazard to equipment and personnel

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