Outburst coal seam hole protection and pressure relief in-hole drilling tool and special out-hole sealing and deslagging system thereof

Abstract

The invention discloses an outburst coal seam hole protection and pressure relief in-hole drilling tool and a special out-hole sealing and deslagging system thereof. The in-hole drilling tool comprises a double-channel sieve hole drill bit and a plurality of double-channel sieve hole drill rods. The out-hole sealing and deslagging system comprises an outer sealing assembly, a carved seam inner sealing pipe and a drill tail flow supply and deslagging assembly. The drilling tool is matched with the out-hole sealing and deslagging system for use; the outer diameter of each double-channel sieve hole drill rod is close to the diameter of the drill bit, and the double-channel sieve hole drill rods have the hole protection effect; spiral grooves and spiral convex ribs are arranged on the outer surfaces of the drill rods, pressure relief sieve holes are formed along the spiral grooves and the spiral convex ribs, and the pressure relief sieve holes can relieve pressure on the outer surfaces of the drill rods; out-hole exposed sieve holes of the double-channel sieve hole drill rods are sealed with the outer sealing assembly and the carved seam inner sealing pipe, so that the leakage and loss of slag discharge air flow or water flow are prevented; and the in-hole drilling tool has the functions of hole protection and pressure relief, and an inner slag discharge channel is of a steel sieve hole structure, so that the smoothness of the inner slag discharge channel can be ensured, the gas over-limit accident of a spray hole can be prevented, the excessive hole collapse of a drill hole wall is restrained, the hole forming quality is improved, and the drill hole skewness is reduced.

Description

technical field [0001] The invention relates to the field of coal mine gas drainage drilling technology, in particular to a drilling tool in an outburst coal seam protection hole pressure relief hole and a special hole external sealing slag discharge system. 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 the use of air flow, water flow or wind-water linkage to discharge slag. The annular space between the surface of the drill pipe and the wall of the borehole is the slag discharge channel. Since the slag discharge channel is outside the drill pipe, i...

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Problems solved by technology

[0004] The present invention aims at the problems existing in the prior art, and the present invention provides a drilling tool in the pressure relief hole of the outburst coal seam protection hole and its special closed slag discharge system outside the hole, aiming at solving the problem of drilling and spray holes in the outburst coal seam, improving the Drilling Straightness, Drilling Depth and Hole Quality

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