A method for efficient drainage of water accumulated in goaf areas from repeated mining of multiple coal seams in close proximity

By combining ground geophysical exploration and underground directional drilling with branch hole design, the problem of low efficiency in draining water from goaf areas was solved, achieving efficient and accurate drainage of water from goaf areas and ensuring safe production in coal mines.

CN119844148BActive Publication Date: 2026-05-26CCTEG COAL MINING RES INST +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CCTEG COAL MINING RES INST
Filing Date
2025-01-21
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies have low efficiency in draining water from goaf areas, long construction cycles, and high costs. Furthermore, the drilling trajectory of conventional underground drilling is difficult to control, resulting in low drainage efficiency and an inability to effectively address the threat of water accumulation caused by repeated mining of multiple coal seams.

Method used

By delineating abnormal water accumulation areas and low-lying areas through ground geophysical exploration, water level monitoring holes and surface drainage holes are laid out. Downhole directional drilling is designed and constructed to ensure that its trajectory covers abnormal and low-lying areas. Branch hole design is adopted to carry out through-hole work until the water output reaches the target value. Combined with real-time monitoring and adjustment strategies, efficient drainage is achieved.

Benefits of technology

It improved the accuracy and efficiency of drainage, reduced construction costs, ensured the stability and continuity of underground drilling, and effectively solved the threat of water accumulation in goaf areas to coal mine safety.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention relates to the field of mine water hazard prevention and control technology, and provides a method for efficient drainage of water accumulation in goaf areas affected by repeated mining of multiple coal seams in close proximity. The method includes the following steps: conducting surface geophysical exploration of the prevention and control area and collecting mining information of the coal seams in the goaf; delineating abnormal water accumulation areas and low-lying areas within the prevention and control area; deploying water level monitoring holes and surface drainage holes in the abnormal water accumulation areas and low-lying areas; designing and constructing underground directional boreholes to ensure that the trajectory of the underground directional boreholes covers the abnormal water accumulation areas and low-lying areas; and performing through-hole drilling on the underground directional boreholes until the water output of each underground directional borehole drops to a target value. The following describes the process of testing the drainage effect in the prevention and control area. This invention, through ground geophysical exploration of the prevention and control area and combined with collected information on the recovery of coal seams overlying the goaf, can accurately delineate areas of abnormal water accumulation and low-lying terrain. By deploying water level monitoring boreholes and surface drainage boreholes within the delineated key areas, it not only achieves real-time monitoring of groundwater levels in these areas but also enables simultaneous drainage both above and below ground. Furthermore, by designing and constructing directional boreholes underground, ensuring their trajectory covers areas of abnormal water accumulation and low-lying terrain, it can more directly and effectively prevent water accumulation in the goaf overlying coal seams of the target area.
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