Screen pipe for salt well brine mining and using method thereof

Abstract

The invention relates to the technical field of salt well mining, in particular to a screen pipe for salt well brine mining. The screen pipe comprises a center pipe arranged in a salt well intermediate casing. The lower end of the center pipe is connected with a guide cone. A plurality of long-strip-shaped kerfs are formed in the positions, close to the guide cone, of the lower portion of the center pipe. The total area of the kerfs is greater than the cross sectional area of the center pipe. The invention further comprises a using method of the screen pipe for salt well brine mining. The method comprises the following steps that (1) the screen pipe for salt well brine mining is inserted into gravel of a salt ledge of a salt cavern, water is injected when the screen pipe is inserted; and (2) water is injected into an annulus between the screen pipe for salt well brine mining and the intermediate casing, and then brine is extruded out of the screen pipe for salt well brine mining through pressure. By adopting the structure, the kerfs are adopted by the screen pipe for salt well brine mining for replacing small holes. In this way, the width of the kerfs is far smaller than the diameter of the small holes with the same displacement, and the effect of filtering gravel of the screen pipe is obviously improved. Besides, the screen pipe can be inserted more deeply so as to extract brine with the high salt mine grade.

Description

technical field [0001] The invention relates to the technical field of salt well mining, in particular to a screen pipe for brine mining in a salt well and a method for using the same. Background technique [0002] Drilling and water-soluble mining technology is a process technology for producing salt raw material brine in the salt industry, which has been successfully applied for decades. Underground salt mines are mined by drilling and water-soluble methods, and huge salt caverns with a diameter of tens of meters will be formed. Due to the uneven taste of the salt mine layers and the large gap, a large number of insoluble particles with different particle sizes will be produced during the mining process. Larger particles will accumulate at the bottom of the salt cavern, while smaller ones will be at the top, and some are even suspended in the high-concentration brine at the bottom, and will be pressed out along with the brine during production. In order to prevent the ins...

AI Technical Summary

Problems solved by technology

This utility model utilizes the phenomenon of natural dissolution of underground salt mines when they meet water in the mine, and the principle of liquid specific gravity interchange flow. The structure of the mining area is complex, the cave is subsidence, the grade of the salt mine is low, and the rock swelling in contact with water causes the blockage of the underground brine mining channel of the salt mine, making it impossible to produce brine; but the sand and gravel filtration effect of this utility model is not ideal, and the concentration of the brine mining is not enough high

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