Method of backfilling and sealing holes with coal cuttings in gas pre-drainage drilling holes

Abstract

The invention discloses a gas pre-pumping drilled hole coal dust backfill sealing method. The gas pre-pumping drilled hole coal dust backfill sealing method includes the steps of collecting and carrying out filtering or smashed filtering on coal dust while holes are drilled in a coal seam through a drilling tool, keeping the particle sizes of the coal dust smaller than or equal to 1 mm, inputting the filtered fine coal dust into a stirrer, adding cement and white emulsions to make a fine coal mixture in a stirred mode, wherein the fine coal mixture comprises, by weight, 60%-70% of fine coal dust, 25%-35% of cement and 4%-6% of white emulsions, and then adding water to continuously carry out stirring to enable the proportion of the water to the fine coal mixture to range from 0.3 to 0.5. According to the gas pre-pumping drilled hole coal dust backfill sealing method, cement paste is replaced with fine coal slurry to carry out hole sealing, and the coal slurry and coal are tightly combined and are free of shrinking and free of pollution to the coal. The fine coal dust serves as hole sealing materials and can be locally used, the mining cost is reduced, mixing is easily and conveniently achieved, and it is determined that the hole sealing effect is good after multiple times of testing. In addition, after the coal seam is mined, residual impurities such as cement and dinas can not be more, the mining purity is high, the minting efficiency is high, and the gas pre-pumping drilled hole coal dust backfill sealing method is quite suitable for popularization and implementation.

Description

technical field [0001] The invention relates to a hole sealing technology in the technical field of coal mines, in particular to a method for backfilling and sealing holes with coal cuttings in gas pre-extraction drilling holes. Background technique [0002] With the rapid development of the coal industry and the mechanization of coal mine production, the problem of dust damage in coal mine production is still severe. The incidence of pneumoconiosis among coal miners is relatively high, and coal dust explosions occur from time to time. Gas outburst is a serious natural disaster in coal mines. Seriously restrict the safe production of coal mines. The standard coal mining process needs to drain the gas from the coal seam first. Since the coal seam is buried deep underground and the pressure between the coal seams is high, it is necessary to insert a gas drainage pipe after the coal seam is drilled to extract the gas deep in the coal seam. The gas drainage process needs to sea...

AI Technical Summary

Problems solved by technology

It takes a long time to seal holes with cement mortar and inject water, the sealing effect is not good, the ability to withstand air pressure is not strong, and it consumes a lot of materials and is inconvenient to operate

[0003] In addition, the joint between the cement slurry and the coal body is currently used tightly, the cement slurry will shrink slightly after solidification, the sealing effect is poor, and the coal body will be polluted, resulting in an increase in the ash content of the coal.

Images