An air-driven halogen extraction system

Abstract

The invention relates to the technical field of underground brine exploitation, and is an air-driven brine extraction system which combines a brine collection well, an air injection hole and a horizontal brine guide hole. In the present invention, a large-diameter drilling rig is used to construct large-diameter brine collecting wells; then a plurality of brine-collecting wells are passed through the bottom of the aquifer through the horizontal directional hole technology, and then a plurality of gas injection holes are arranged at a certain distance on both sides of the horizontal directional hole. , it is used to inject compressed air into the formation through the gas injection hole, drive the brine to flow to the brine collecting well and the horizontal brine pipe, and then discharge it to the brine channel through the horizontal brine hole. The invention can reduce the cost of brine extraction, greatly increase the amount of brine extraction, improve the mining efficiency and improve the recovery rate for the extraction of the brine in the fine clastic aquifer with low porosity, low water supply and low permeability.

Description

technical field [0001] The present application relates to an air-driven brine extraction system, in particular, to a brine mine using a combination of brine collecting wells, gas injection holes and horizontal brine conducting holes under the conditions of low porosity, low water supply and low permeability. mining method. Background technique [0002] my country is the world's largest consumer of potash fertilizer, and potash is one of the seven major minerals in short supply in my country, and has become an important strategic resource to ensure national food security. China's KCl geological reserves are about 990 million tons, and mainly liquid brine mines. The production of potash is mainly through the collection of salt lake underground brine to produce potash fertilizer. At present, most of the salt lake surface salt rock layer brine is seriously insufficient, and the salt lake surface salt rock layer brine can no longer maintain normal production, which makes the serv...

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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