Closed underground brine mining system and construction method thereof

Abstract

The invention relates to the technical field of underground brine mining, and specifically provides a closed underground brine mining system and a construction method thereof. The closed underground brine mining system includes a gas compression device, a first water isolation layer, a second water isolation layer, a brine storage layer, partition walls, brine drainage wells and water isolation dams, wherein the brine storage layer, the partition walls, the brine drainage wells and the water isolation dams are located between the first water isolation layer and the second water isolation layer. The upper ends of the partition walls extend to the first water isolation layer, the lower ends of the partition walls extend to the second water isolation layer, and the partition walls, the firstwater isolation layer, the second water isolation layer and the water isolation dams divide the brine storage layer into a plurality of enclosed spaces. Each enclosed space is a brine mining block. Agas compression well is arranged at the position, near the center of a lake, in each brine mining block, the brine drainage wells are arranged at the positions, near the edge of the lake, in the brinemining blocks, the brine drainage wells are provided with brine drainage pipes, and brine can be drained through the brine drainage pipes and then directly transported to salt pans or grit chambers.The closed underground brine mining system can reduce the cost of brine mining, greatly increases the mining amount of the brine, and improves the mining efficiency and increases the recovery rate.

Description

technical field [0001] The invention relates to the technical field of underground brine mining, in particular to a closed underground brine mining system and a construction method thereof. Background technique [0002] Potassium salt is mainly divided into two categories, one is solid potassium salt, which is mainly distributed in Canada, Russia, Belarus, Thailand, Laos and other countries, and only a small amount is distributed in Jiangcheng, Yunnan Province in my country; the other is liquid brine mine, which is mainly distributed in Among the salt lakes in arid and semi-arid areas, my country is mainly distributed in the salt lakes in Qinghai, Xinjiang, Tibet and other regions in the west of China; potassium salt resources are my country's strategic resources, and potassium salts are mainly used to produce potash fertilizers for agricultural production and are food grains. [0003] China is the largest potash fertilizer consumer in the world, and potash is one of the seve...

AI Technical Summary

Problems solved by technology

China's geological reserves of KCl are about 990 million tons, and liquid brine mines are the mainstay. The production of potassium salts is mainly through the collection of underground brine in salt lakes to produce potassium fertilizers. With the extension of the development period of salt lakes, the increase in development intensity and production volume At present, most of the surface brine of the salt lake is seriously insufficient, and the brine of the surface salt layer of the salt lake can no longer maintain normal production, so that the service life of the salt lake resources is constantly shortening, and the service life of the salt lake resources in my country is less than 30 years

The third is the method of brine extraction combined with wells and canals. At present, this method is used by most of the salt lakes to extract brine from the deep brine storage layer below the surface salt rock layer of the salt lake, because only a single channel or well mining cannot meet the actual production conditions. It is not the best and most economical way; due to the low porosity, slow flow rate and small range of brine mining in the deep brine storage layer below the surface salt rock layer of the salt lake, and the high cost of brine mining canal excavation, the combined layout and construction is relatively simple Brine extraction wells can be arranged in areas where the brine extraction canals are difficult to extend, which can make up for the shortage of brine extraction; but for the deep brine storage layer below the surface salt rock layer of the salt lake with low porosity, low permeability, and low water supply Said that there is still the problem that the amount of brine is too small to meet the actual needs of production

[0006] From the point of view of the existing brine mining technology in the deep brine storage layer below the surface salt rock layer of the salt lake, the brine is mainly mined through the combination of wells and channels. The way of collecting brine and extracting brine through man-made or natural brine water level difference in brine extraction canals and brine extraction wells, not only the brine flow rate is slow and the flow rate is small, but also the efficiency of brine extraction is low, the amount of brine extraction is small, and the construction cost is high. It is difficult to meet the actual production needs. For salt lakes where there is still a large amount of surface water on the surface of the lake, it is more difficult to collect deep underground brine

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