RU2037012C1 - Method of discharging water in the process of draining rock massif - Google Patents

Abstract

FIELD: construction and mining. SUBSTANCE: method involves constructing drainage device on area to be drained; drilling pumping wells and working them deeper into water intake area, which is defined in water-bearing bed below level of area to be drained in the direction of flowing of middle waters; unsealing rocks of area, for example by borehole hydraulic mining method; connecting drainage devices and pumping wells by water duct and discharging water into water intake area. EFFECT: increased efficiency of method by effectuating draining without ecological disturbances which may occur during pumping of water from one bed into the other and increased economy by minimized production costs. 1 dwg

Description

 The invention relates to the construction and mining and can be used in mining and construction of underground structures.

There is a known method of draining aquifers, including drilling drainage wells in a drained area and injection wells outside a draining area, pumping water through drainage wells, pumping it through a water conduit to injection wells, and pumping through them into an underground formation under pressure exceeding the formation pressure of the underground formation [1]
The disadvantage of this method is the undesirable environmental consequences due to the fact that water is pumped from one reservoir to another, which is especially unacceptable with aggressiveness and contamination of the water, and for their treatment require large costs.

There is also a known method of water drainage from underground workings, including the construction of drainage devices, drilling injection wells with deepening them into the water intake section, water drainage from the drainage devices and supplying it to the injection wells through the water conduit with decompression of the rocks of the water receiving section, adding additives to the waste water, the quality of which is used a mixture of aqueous solutions of nitric and sulfuric acids [2]
The disadvantage of this method is the undesirable environmental consequences caused by the introduction of acids, and the gradual mudding of wells.

 The problem solved by the invention, the creation of a method of water drainage during the drainage of the field, allowing drainage without environmental damage caused by pumping water from one reservoir to another, at minimal cost.

 The problem is achieved in that in the method of water drainage during the drainage of the rock mass, including the construction of drainage devices, drilling injection wells with deepening them into the water intake section, water drainage from the drainage devices and supplying it to the injection wells through the water conduit with decompression of rocks of the water intake section, water intake the site is isolated in an aquifer below the level of the drained area in the direction of formation water movement, and the decompression of its rocks is carried out before water is supplied to the injection wells through a water conduit.

 The proposed method is illustrated in the drawing.

 The method is as follows.

 At the field, based on the study of the hydro- and engineering-geological situation, the direction of groundwater movement of the drained horizon is determined, the areas of primary development and drainage, as well as areas suitable for placement of injection wells, are identified. Then proceed to the construction of drainage devices (wells) 1 in the drained section 2 and the drilling of injection wells 3, with their deepening into the water intake section 4 located below the level of the drained section 2 in the direction of the formation water movement. The absorption zone of the injection wells 3 should be located below the level of the drained horizon 5. In practice, the absorption zone should be located below the level of the lower working horizon at which the main mining operations will go. If preparatory mining operations are conducted at a deeper horizon 5 at the same time, they should be carried out in the direction opposite to the direction of formation water movement in order to avoid additional flooding.

 After drilling the injection wells 3, they begin to decompress the rocks of the water intake section 4 into which they are drilled. This is done to increase the permeability of rocks in a significant space around them, so that the injection of water practically did not increase the level of the drained horizon in the area of the drained area 2.

 Densification of the array can be achieved by various methods, but the geotechnological method is most acceptable, since it allows you to influence the array at a great distance without causing local compaction and preserving the natural structure of the skeleton of the array. In particular, arrays having a sufficiently rigid skeleton filled with loose ore varieties having low filtration properties can be decompressed by the method of downhole hydraulic production.

 After decompression of the massif through injection wells 3, their characteristics are tested, for example, using the most distant ones, such as drainage, and then the injection 3 and drainage 1 wells are connected with a water conduit 6. Water can be supplied to the wells under pressure or in bulk, depending on the horizon, where is the receiving head of the injection well 3.

 When implementing the proposed drainage scheme, ecological balance can be maximally ensured, since the drainage water will be in the same drained horizon, which is especially important with different quality of water from different horizons.

Claims (1)

 METHOD OF WATER DISCHARGE WHEN DRYING MOUNTAIN ARRAY, including construction of drainage devices, drilling of injection wells with their deepening into the water intake section, water drainage from the drainage devices and its supply to the injection wells through the water conduit with decompression of the rocks of the water intake zone, characterized in that the water reception section aquifer below the level of the drained area in the direction of formation water movement, and decompression of its rocks is carried out before water is supplied to the injection wells through the water conduit.