Outburst coal seam circumferential flow supply hole protection and pressure relief sieve pore drill rod

Abstract

The invention discloses an outburst coal seam circumferential flow supply hole protection and pressure relief sieve pore drill rod. A drill rod body is formed by combining an outer pipe and an inner pipe, a plurality of axial flow supply channels are formed in the circumference of the drill rod body, and a circular-diameter inner slag discharging channel is formed in the center of the drill rod body; and a spiral groove or an axial groove or a plane is formed in the outer surface of the outer pipe of the drill rod body, and slag discharging sieve pores which are communicated with the inner slag discharging channel and avoid the flow supply channels are formed in the spiral groove, the axial groove and the plane. The drill rod is an inner slag discharging channel drill rod with circumferential flow supply, the diameter of the drill rod can be close to the diameter of a drill bit, the drill rod has the hole protection and pressure relief functions and can be used for conventional drilling and cableless directional drilling of an outburst coal seam, and if a cable passing pipe and a built-in communication cable thereof are installed in the axis of the inner pipe of the drill rod, the drill rod can also be used for cable passing directional drilling.

Description

technical field [0001] The invention relates to the technical field of gas drainage drilling in coal mines, in particular to a circular supply protection hole pressure relief screen hole drill rod for outburst coal seams, which is used for the construction of gas drainage boreholes in soft outburst coal seams with severe hole collapse. , the drill pipe can also be used for cableless directional drilling, making directional drilling technology suitable for straight hole drilling in outburst coal seams. Background technique [0002] Most of the drill pipes used for gas drainage drilling in outburst coal seams are grooved drill pipes, ribbed drill pipes, three-edged grooved drill pipes and three-edged drill pipes, among which the patent applicant for the first three kinds of drill pipes is the present application People, namely Henan Polytechnic University, the patent numbers are ZL200610111830.7, ZL200920088879.4, ZL200910064973.0. The common feature of these drill pipes is t...

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Problems solved by technology

[0005] The present invention aims at the problems existing in the prior art. First, in view of the problems existing in the conventional drilling of the existing outburst coal seam, it provides a circular supply and protection hole pressure relief screen hole drill pipe for the outburst coal seam, aiming at solving the problem of conventional drilling in the outburst coal seam. Drilling and injection hole problems, improve drilling straightness, drilling depth and hole quality, the inner slag discharge channel is a circular diameter, to overcome the existence of the slag discharge screen drill pipe in the diameter of the center supply ring, which cannot be lowered to protect the hole The disadvantages of the screen pipe and other structural disadvantages; secondly, in view of the fact that the existing directional drilling technology is difficult to adapt to the current situation of the outburst coal seam, a kind of outburst coal seam circumferential supply and protection hole pressure relief screen hole drill pipe is provided, so that the directional drilling technology It can be adapted to the drilling of soft and outburst coal seams

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