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Mine water deep well recharge method

A mine water and deep well technology, applied in mining equipment, earthwork drilling, mining equipment, etc., can solve the problems of excessive detection of heavy metals in wastewater, failure to meet discharge standards, and impact on the surrounding environment, achieving long-term safety and environmental protection, reducing treatment costs, The effect of protecting the ecological environment

Pending Publication Date: 2022-08-05
中国冶金地质总局第一地质勘查院
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of mine water deep well recharge method, to solve the mine water in the prior art proposed in the above background technology, the mine water is mostly treated and processed before being reused or even directly discharged, and part of the waste water is recycled for use. It is necessary for mine production, but most of the heavy metal detection in wastewater exceeds the standard and cannot meet the discharge standard. This will not only cause high costs, but also have a certain impact on the surrounding environment.

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specific Embodiment approach 1

[0023] For the first specific implementation, please refer to Figure 1-3 , The present invention provides a technical scheme: a method for recharging a deep well in a mine, comprising: step 1: determining the target layer for recharging; step 2: predicting the amount of water injection; step 3: selecting the location of the recharging well; step 4: finalizing the design Pore ​​layer and depth; Step 5: Design the well structure; Step 6: Carry out the water injection test of the recharge well to determine the recharge capacity of the target layer;

[0024] In this implementation, the recharge target layer determined in step 1 has low minimum principal stress and low fracture pressure, and the lithology of the recharge target layer is pure, the porosity and permeability conditions of the coarse sandstone section are the best, and the recharge target layer is cored The fractures are relatively developed and have a larger thickness, which is conducive to the expansion and extensio...

specific Embodiment approach 2

[0025] Specific embodiment 2, this embodiment is a further limitation of specific embodiment 1. The recharge target layer in the present invention needs to have the following characteristics: a. Low minimum principal stress and fracture pressure; b. Low density, high depth and shallow lateral difference; c. The lithology is pure, and the porosity and permeability conditions of the coarse sandstone section are the best; d. Coring fractures are relatively thicker than the developed section and e.

[0026] In this implementation, the estimated water injection amount in step 2 can be estimated according to the formula V=πR2Hφ, and V is the volume of the injected medium, m3; R is the radius of the treatment layer, R=500m (3a); H is the thickness of the treatment layer, H= 69m (69m in the section with better infiltration conditions), Φ is the porosity of the treated layer, which is taken as 7.49%.

specific Embodiment approach 4

[0027] Specific embodiment four, this embodiment is a further limitation of specific embodiment one, the linear regression method of the estimated water injection amount in the present invention:

[0028] According to the logarithmic regression model established according to the water pressure test data of Well MC-1 in Mudu Chaideng Mine and Well NL-1 in Nalinhe No. 2 Well, when the water injection volume of Well MC-1 reaches 1 million m3, the corresponding water injection pressure is 8.3MPa; 1 When the water injection volume reaches 800,000 m3, the water injection pressure is 10.2MPa; the relationship between injection pressure and injection volume can be seen in detail figure 1 and figure 2 shown.

[0029] In this implementation, in step 3, the drilling trajectory at the position of the recharge well needs to maintain a certain safety distance from the underground roadway and the chamber.

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Abstract

The invention discloses a mine water deep well recharge method. The method comprises the steps of 1, determining a recharge target layer; 2, the water injection rate is predicted; thirdly, the position of a recharge well is selected; 4, designing the position and depth of a final hole; 5, designing a well bore structure; sixthly, a recharge well water injection test is conducted, and the recharge capacity of a target layer is determined; in the third step, a certain safe distance needs to be kept between the drilling track of the recharge well position and the underground roadway and the underground chamber; in the fourth step, a sandstone layer with good permeability is generally selected as a final hole layer. According to the method, the mine water passes through the drilling well with the casing pipe, the deep sandstone aquifer with good fracture development and permeability is selected for reinjection, the mine water treatment pressure is relieved, reinjection cannot generate adverse effects on the ore-bearing bed, effective supply can be conducted on a deep water-bearing system, the deep water-bearing system participates in new underground water circulation, and effective protection of underground water is achieved.

Description

technical field [0001] The invention relates to the related technical field of mine water deep well recharging, in particular to a mine water deep well recharging method. Background technique [0002] In the process of coal mining, due to special geological and hydrogeological conditions, the mining layer is closely related to the surrounding aquifer water, resulting in a large amount of water inflow in the mine, which makes it necessary to extract the mine water, and the extracted water must pass through a certain amount of water. Physical and chemical treatment can only be used for production, life and direct discharge, which not only increases the cost but also has a certain impact on the surrounding environment. Deep well recharge technology can not only solve these problems, but also help to form "benign recharge" and reduce groundwater pollution. risk; [0003] However, the mine water in the prior art is mostly treated and then reused or even directly discharged, and ...

Claims

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Application Information

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IPC IPC(8): E21F17/00
CPCE21F17/00Y02E10/10
Inventor 韩雪李一张宇胥燕辉张昊张建寅朱开成王广昊周海瑞盛新丽
Owner 中国冶金地质总局第一地质勘查院
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