Method for searching for and preventing mine water seepage of Ordovician limestone mine field

An Ordovician and limestone technology, applied in the field of searching for Ordovician limestone mining areas and preventing mine water seepage, can solve the problems of increasing mine wastewater discharge, coal production cost, destroying groundwater resources and ecological environment, etc. The effect of saving water prevention and control funds, liberating coal resources, and improving water blocking performance

Active Publication Date: 2014-03-19
北京大地高科地质勘查有限公司
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Problems solved by technology

The traditional drainage and depressurization mining not only increases the waste water discharge of the mine

Method used

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  • Method for searching for and preventing mine water seepage of Ordovician limestone mine field
  • Method for searching for and preventing mine water seepage of Ordovician limestone mine field

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[0044] 1. First and second drilling construction

[0045] The first opening and the second opening have been completed by other teams. The first opening uses a φ311.15mm drill bit to drill until it reaches 10m into the bedrock, and the φ244.5mm technical casing is lowered. In the second opening, a φ215.9mm drill bit was used to drill until the 9# coal seam was penetrated for 5m, then a φ177.8mm geological casing was run to the kickoff point, and the well was cemented.

[0046] 2. Three-way construction

[0047] The third horizontal multi-branch section is constructed with a φ152.4mm PDC drill bit, and the deflection drilling tool assembly is used to deflect from the sidetracking point to a well inclination angle of about 90 degrees (the final well inclination angle is determined according to the formation inclination angle) and enters the Ordovician limestone. Continue to drill in the Ordovician limestone. If there are cracks, faults, subsidence columns and other geological str...

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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 engineering, in particular to a method for searching for ordovician limestone mining areas and preventing mine water seepage. Background technique [0002] With the continuous development of coal mining, mine mining is more and more seriously threatened by groundwater. In particular, my country's North China coal mine enterprises regard mine water prevention and control as the primary task of safe production. However, hidden dangers cannot be completely eliminated, and sudden water damage still occurs. The main reason is that the deep coal resources are under pressure mining, the Ordovician limestone aquifer has a large water storage capacity, high head pressure, well-developed fissures in the aquifer, and hidden water-conducting structures, which lead to frequent water inrush accidents during coal mining. [0003] With the increasing ...

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Application Information

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IPC IPC(8): E21B33/13E21B7/04
Inventor 刘永彬杨涛杜兵建董恒义张才王越
Owner 北京大地高科地质勘查有限公司
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