A kind of outburst coal seam protection hole pressure relief combined drilling tool and using method thereof

Abstract

The invention discloses a pressure-relief combined drilling tool for protection holes in outburst coal seams and a method for using the combined drilling tool. The drill bit is connected with the spiral groove sieve hole drill rod, one end of the transition lapping device is connected with the spiral groove sieve hole drill rod, and the other end is connected with the special-shaped grooved drill rod, the special drill bit, the transition lap device, the spiral groove sieve hole Drill rods and special-shaped grooved drill rods are coaxially distributed. In the present invention, the helical groove sieve hole drill pipe and the special-shaped grooved drill pipe are used, and the special drill bit and the transition lapping device are used to form a combined drilling tool, which can achieve a better hole protection and pressure relief effect during the drilling operation. And it is convenient to collect gas and coal dust at the hole mouth, and the structure combination is convenient, which improves the flexibility of drilling operation.

Description

technical field [0001] The invention belongs to the technical field of gas drainage and drilling in coal mines, and in particular relates to a pressure relief combined drilling tool for protecting holes in outburst coal seams and a method for using the same. Background technique [0002] Drilling in soft coal seams and outburst coal seams has problems such as difficult slag removal, low drilling efficiency, shallow drilling depth, low hole formation rate, and poor hole formation effect, which directly affect the quality of drilling hole sealing and gas drainage efficiency. [0003] At present, the commonly used drill pipes for drilling in coal mines include helical (low spiral) drill pipes, triangular-edged drill pipes, smooth surface drill pipes, special-shaped cross-section drill pipes, and double-channel hole protection drill pipes. Each type of drill pipe has its own applicable conditions. and pros and cons. [0004] In the current downhole drilling process, a single ty...

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Problems solved by technology

The cost of the drill pipe is relatively high, and there are problems such as difficulty in collecting gas and coal dust at the drilling hole

[0008] In addition, the above-mentioned drill pipes are mostly used alone, and the combination of drilling tools is not implemented on the basis of combining their respective advantages, and the advantages of each drill pipe cannot be better utilized.

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