Cross layer drilling separated type whole-course gas extraction hole sealing device and method

Abstract

The invention discloses a cross layer drilling separated type whole-course gas extraction hole sealing device and method. The device comprises a hole drilled in a coal seam, the top end of the drilledhole is in a drilled hole gas chamber in a second 1 coal seam, the inner cavity of the drilled hole gas chamber is provided with an upper hole sealing pipe, and the lower end of the drilled hole is provided with a lower hole sealing pipe; the wall of the upper hole sealing pipe is provided with a hole sealing pipe fixing device in a sleeve mode, and the upper hole sealing pipe is fed into the upper portion of the drilled hole gas chamber through a pushing rod; an upper bag and a lower bag are arranged inside a cavity formed between the outer wall of the lower hole sealing pipe and the innerwall of the drilled hole gas chamber, and a middle cavity formed by the upper bag and the lower bag is filled with expansion slurry; the lower hole sealing pipe is provided with a slurry injection pipe, and the expansion slurry is injected through the slurry injection pipe. The method comprises arranging the upper hole sealing pipe from the position of the drilled hole gas chamber to a coal crossed section, performing 'blocking twice with one injection) pressurized hole sealing through the lower hole sealing pipe and draining gas in the middle through drilled rock sections, thereby achieving good hole sealing air tightness, being less prone to gas leakage and meanwhile reducing the hole sealing costs as well as saving the drilling costs.

Description

technical field [0001] The invention specifically relates to a hole-sealing device and a hole-sealing method of a layer-perforating drilling separation type full-process gas drainage sealing device. Background technique [0002] Mine gas is one of the main factors that seriously threaten the safe production of coal mines. Gas explosions and gas outbursts are the most serious disasters in coal mines today, causing many casualties and huge property losses every year. Therefore, the prevention of gas disasters is of great significance to the reduction of coal mine accidents and the healthy and sustainable development of the quality-guaranteed coal industry. [0003] Gas drainage in coal mines is to drill into coal seams or gas accumulation areas, connect the drill holes to special pipelines, and use drainage equipment to pump the gas in coal seams and goafs to the ground for utilization; gas drainage can reduce mining costs. It is an important measure to prevent gas explosion...

AI Technical Summary

Problems solved by technology

[0004] However, using the traditional gas drainage and sealing device with the whole process of down-sealing pipes, during the implementation of the anti-outburst measures in the coal seam belt strip gas area of ​​the pre-drainage coal seam strip gas area, the drainage concentration is low. , fast flow attenuation and other issues. After the sealing of the whole process of down-sealing pipe, the whole-process down-sealing pipe has problems such as long docking time of the sealing pipe, easy falling off in the drilling hole, many consumables, and high cost.

Images