Air-driven brine extraction system

Abstract

The invention relates to the technical field of underground brine extraction, in particular to an air-driven brine extraction system combining brine collection wells, air injection holes and horizontal brine guide holes. According to the system, firstly, a large-caliber drilling machine is adopted for construction to form the large-caliber brine collection wells; then on the basis of the horizontal directional hole technology, a plurality of brine collection wells penetrate through the bottom of an aquifer, then a plurality of air injection holes are arranged at the positions, away from the two sides of horizontal directional holes by a certain distance, of the two sides of the horizontal directional holes, and the air injection holes are used for injecting compressed air into a stratum todrive brine to flow to the brine collection wells and a horizontal brine guide pipe and then to be discharged to a brine conveying channel through horizontal brine guide holes. According to the system, for extraction of the low-porosity, low-water-yield and low-permeability fine-debris aquifer brine, the brine extraction cost can be reduced, the brine extraction amount is greatly increased, the mining efficiency is improved, and the recovery ratio is increased.

Description

technical field [0001] This application relates to an air-driven brine extraction system, in particular, to a brine mining system that utilizes a combination of brine collection wells, gas injection holes and horizontal brine guide holes under the conditions of low porosity, low water supply and low permeability mining method. Background technique [0002] my country is the largest potassium fertilizer consumer in the world, and potassium salt is one of the seven bulk minerals in short supply in my country, and has become an important strategic resource to ensure national food security. 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 salt lake s...

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

[0003] my country's potash resources account for only 2% of the world's proven reserves, but its production accounts for 15% of global output, and my country's potash fertilizer consumption accounts for 25% of global consumption; moreover, 97% of my country's potash resources % is the brine-type salt lake deposit resources in Qinghai and Xinjiang. After decades of high-intensity mining, some salt lakes have no brine to be recovered, and most of the salt lake salt rock layer surface submerged brine mines have been exhausted, especially the salt lake in the Qaidam Basin The underground brine in the lower part of the salt rock layer has been exploited for a long time. Except for a few salt lakes that have temporarily alleviated the plight of brine mining through water replenishment and solid-liquid transformation, the brine mining volume of most of the salt lakes has been unable to meet production needs.

In the salt lake area of ​​the Qaidam Basin, there is a large amount of deep brine below the surface salt rock layer. Due to the constraints of large burial depth, relatively early formation time, and low porosity, the brine reservoirs in the deep brine are mainly some salt-bearing fine grains. Loose deposits dominated by sand and silt layers and rock-salt layers with low porosity have low permeability and low water supply rate, making brine extraction engineering difficult and costly to excavate brine channels, but the amount of brine extraction still cannot meet production needs , with the passage of time, the contradiction will become more prominent, so it is imminent to seek a simple, fast and efficient scientific brine extraction technology

[0004] With the continuous mining of underground brine in the salt lake, the brine mines on the surface of the salt lake have been exhausted, and the commonly used channel mining method can no longer meet the mining of deep brine layers. For deep pore brine with high water content and low porosity fine clastic layer, the cost of mining brine is high, the mining efficiency is low, and it is difficult to realize large-scale, engineering, and sustainable brine mining

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