Coal seam roof aquifer ground advanced pre-drainage method

Abstract

The invention relates to a coal seam roof aquifer ground advanced pre-drainage method. The method comprises the steps that a ground multi-branch updip horizontal well is constructed, and each branch hole of the updip horizontal well penetrates through an enriched water area of a roof aquifer; a large-diameter drainage well leading to the enriched water area of the roof aquifer is constructed, and the large-diameter drainage well is in communication with the updip horizontal well; and a drainage device is put into the large-diameter drainage well, and drainage treatment is conducted through the drainage device. The method can overcome the defects of the existing coal seam roof water disaster treatment technology, can completely remove hidden dangers of the coal seam roof aquifer to be mined before a regional coal mine is not well-built, guarantees that no roof water disaster influence exists in the whole coal mine from well building to well shut-in, and realizes safe, efficient and continuous coal seam mining.

Description

technical field [0001] The invention relates to a method for pre-draining water, which belongs to the technical field of coal mine water disaster prevention and control, and in particular relates to a method for pre-draining water on the ground of an aquifer on the roof of a coal seam. Background technique [0002] As one of the factors affecting the safe mining of coal mines, water damage, especially during the mining of coal mines in water-rich areas, if water damage occurs, it will be difficult and time-consuming to carry out rescue, and it will take a long time for the mine to resume production, which may cause serious loss of life and property. The advanced control of water hazards in coal mine areas is the key work to ensure the safe, efficient and continuous mining of coal mines. The water sources that cause water damage during coal mining mainly come from two aspects. One is that the coal seam roof is enriched with water-bearing strata, and the coal seam excavation p...

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Problems solved by technology

[0004] At present, for the control method of water hazards in coal seam roof enriched water-bearing strata, it is mainly through the implementation of multi-branch horizontal directional hole drilling along the coal seam roof aquifer underground in the coal mine, and each branch directional hole passes through the water-rich area to realize the drainage and discharge of the aquifer Although this method can eliminate the hidden danger of water damage on the roof of the coal seam, the implementation of this method is limited by the underground space of the coal mine. During the period of high-pressure enriched water area, the enriched water is sprayed out along the directional hole with its own high pressure, causing accidents such as high-pressure water injury or flooded equipment. At the same time, it is difficult to realize the hidden danger of water damage on the roof of the coal seam mining face before the coal mine is built. The control work makes it necessary to stop the excavation of the coal seam working face that is urgently needed to be mined. The excavation work can only be carried out after the threat of water hazard on the roof of the coal seam is eliminated, so it is difficult to guarantee the continuous mining of the coal mine

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