A method for searching for ordovician limestone mining areas and preventing mine seepage

Abstract

The invention discloses a method for searching for and preventing mine water seepage of an Ordovician limestone mine field. The method comprises the following steps: drilling a first vertical well vertical to the ground in the center of a coal mine area by using a first drill bit, and stopping drilling and cementing the well until the depth of the vertical well is 8-12 m into bed rock; further drilling downwards by using a second drill bit, and stopping drilling and cementing the well until the second drill bit penetrates into a coal bed by 5-10 m; further drilling downwards by using a third drill bit slantly in multiple directions to form an inclined well, and horizontally drilling after the third drill bit enters Ordovician limestone; in the horizontal drilling process of the drill bit, searching an Ordovician limestone gap, and plugging the gap till the edge of the coal mine area. Compared with the conventional vertical-well drilling for grouting plugging, horizontal-well multi-branch plugging construction really reduces manpower investment, equipment investment, construction area and other investments; by the method, the problem of lower group coal mining can be safely and efficiently solved, the water blocking performance of each floor water-resisting layer is improved, and pressure mining is implemented; by the method, a lot of money for water control in coal mining can be saved and coal resources are further released.

Description

Technical field [0001] The invention relates to a horizontal directional drilling technology used in mine water hazard prevention and control projects, in particular to a method for searching and preventing mine water seepage in Ordovician limestone mining areas. Background technique [0002] With the continuous development of coal mining in depth, mine mining is increasingly being threatened by groundwater. In particular, North China coal mining companies regard mine water prevention and control as the primary task of safe production, although underground drilling and geophysical prospecting have been adopted. Means, but still can not completely eliminate hidden dangers, sudden water damage still occurs. The main reason is that the deep coal resources are under pressure mining. The Ordovician limestone aquifer has large water storage capacity, high head pressure, developed aquifer fissures, and hidden water-conducting structures, making water inrush accidents frequent during coa...

AI Technical Summary

Problems solved by technology

The traditional drainage and depressurization mining not only increases the waste water discharge of the mine and the production cost of coal, but also destroys the groundwater resources and the ecological environment.

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