Artificial modification of groundwater chemical characteristics to promote water retention method of aquifer restoration
A technology of chemical characteristics and chemical modifiers, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve the problems of difficult injection success, small macro size, etc., to improve water quality, strong practicability, and use. method scientific reliable effect
Active Publication Date: 2020-03-27
CHINA UNIV OF MINING & TECH
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Problems solved by technology
[0004] Due to the small macroscopic size of the pores / cracks in the rock mass of the underground aquifer, it is often difficult to inject successfully if the method of directly injecting cement slurry, clay, etc.
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Embodiment Construction
[0033] Embodiments of the present invention will be further described below in conjunction with accompanying drawings:
[0034] The method for artificially modifying the groundwater chemical characteristics to promote the repair of the aquifer according to the present invention comprises the following steps: when there is a water gushing in the well, it is determined whether a chemical modifier needs to be used to recharge the borehole according to whether there is an aquifer within the height range of the water-conducting fissure zone , if necessary, construct chemical modifier recharge boreholes on the surface corresponding to the boundary and middle of the mining area, and select appropriate chemical modifiers from chemical modifier recharge boreholes according to the chemical characteristics of mining damage to aquifer water storage Recharge, using the chemical modifier recharged into the aquifer to chemically react with groundwater anions and cations to form sediments that...
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The invention discloses a water retention method with artificially modified groundwater chemical characteristics and used for promoting the repair of a water-bearing stratum. According to the development characteristics and the distribution range of a mining-induced water conduction fracture in the overburden rock, a chemical modifier recharging hole is formed in the boundary of the mining area and the middle of the mining area corresponding to the surface construction chemical modifier respectively. After that, a proper chemical modifier is selected in a targeted manner according to the chemical characteristics such as the pH value and the hardness of the water body of the water-bearing stratum which is damaged during the mining process. Meanwhile, a precipitate which is generated duringthe reaction of the chemical modifier poured into the water-bearing stratum together with anions and cations contained in the underground water is utilized for effectively blocking off pores / fracturesin the rock body of the water-bearing stratum. The method is simple in steps, convenient to use, safe and environmentally friendly. By adopting the method, the in-situ remediation of the coal mining-damaged water-bearing stratum is realized.
Description
technical field [0001] The invention relates to a method for repairing underground aquifers and protecting water resources, in particular to an artificial modification of groundwater chemical characteristics suitable for use in the fields of mining-damaged bedrock aquifer restoration, water resource protection, and underground water hazard prevention and control in coal mining areas Water retention methods to promote aquifer restoration. Background technique [0002] Underground coal mining will cause the movement and destruction of the overlying rock, thereby forming water-conducting fissures in the overlying rock; The occurrence of this phenomenon will not only cause the groundwater level to drop and deteriorate the surface ecological environment, but also easily lead to underground water inrush accidents when the aquifer is rich in water and the water-conducting fractures are well developed. , posing a threat to the safety of personnel and property. Therefore, how to ta...
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IPC IPC(8): E21B33/13E21B43/22
CPCE21B33/13E21B43/16
Inventor 鞠金峰李全生许家林毛小松
Owner CHINA UNIV OF MINING & TECH