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Well washing method for in-situ leaching uranium mining

A technology of in-situ leaching and well cleaning, applied in chemical instruments and methods, earth-moving drilling, wellbore/well components, etc., can solve problems such as poor well cleaning effect

Pending Publication Date: 2020-11-03
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is simple to operate, but the direct addition of high-concentration industrial acid has poor cleaning effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0040] In the present invention, there is no special limitation on the preparation method of the chemical well-flushing agent, which can be prepared by the preparation method of the composition well-known to those skilled in the art.

[0041] In the present invention, the amount of the chemical well-flushing agent injected per meter of filter length is preferably 3.2 to 4.8m 3 , more preferably 3.5-4.4m 3 .

[0042] In the present invention, it is preferable to inject the chemical flushing agent into the mine layer through the 316L stainless steel pipe. Well agent.

[0043] In the present invention, the time for the mud skin dissolution reaction is preferably 16-48 hours, more preferably 20-42 hours.

[0044] After the mud skin is dissolved and reacted, the present invention lifts the packer to the surface, then pumps water from the production well of the uranium deposit, and completes the well flushing when the pH value of the pumped well flushing water is 6.5 to 7.5 .

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Embodiment 1

[0048] The depth of industrial uranium mineralization in a certain uranium deposit is 308.2-332.6m, and the average thickness of the ore bed is 12.0m. The C0109 production well is a pumping well, the casing specification is Φ152×12mm, and the material is UPVC. The filter is an annular outer frame filter, the filter position is 314.2-322.9m, and the length is 8.7m.

[0049] Step 1: Use 316L stainless steel pipe with a specification of Φ63×4.5mm to put a packer into the C0109 production well. The bottom of the packer is placed at 312.0m, 2.2m away from the upper surface of the filter;

[0050] Step 2: Use the liquid injection pump to inject clean water through the stainless steel tube to pressurize. When the pressure reaches 4.2MPa, the packer is set;

[0051]Step 3: Use the liquid injection pump to inject chemical well-flushing agent into the mine layer through the 316L stainless steel pipe through the packer. The formula of the chemical well-flushing agent is 0.8% (mass frac...

Embodiment 2

[0055] The depth of industrial uranium mineralization in a certain uranium deposit is 344.9-368.5m, and the sand body lithology is mainly fine sandstone and siltstone. The SC02 production well is a pumping well, the casing specification is Φ152×12mm, and the material is UPVC. The filter is an annular outer frame filter, the filter position is 350.1-359.2m, and the filter length is 9.1m.

[0056] Step 1: Use 316L stainless steel pipe with a specification of Φ63×4.5mm to insert a packer into the SY02 production well. The bottom of the packer is placed at 347.6m, 2.5m away from the upper end of the filter;

[0057] Step 2: Use the liquid injection pump to inject clean water to pressurize. When the pressure reaches 4.8MPa, the packer is set;

[0058] Step 3: Use the liquid injection pump to inject chemical well-flushing agent into the mine layer through the 316L stainless steel pipe through the packer. The formula of the chemical well-flushing agent is 1.5% (mass fraction) of su...

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PUM

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Abstract

The invention provides a well washing method for in-situ leaching uranium mining, and belongs to the technical field of in-situ leaching uranium mining. The method comprises the steps that a packer islowered into a uranium deposit production well to the upper surface of a filter; water is injected into the packer for pressurization, and setting of the packer is achieved; a chemical well washing agent is injected into an ore bed through the packer, wherein the chemical well washing agent and the ore bed are subjected to a mud cake dissolution reaction; and after the mud cake is subjected to the dissolution reaction, the packer is unsealed, the packer is lifted to the ground surface, then the uranium deposit production well is subjected to water pumping, and well washing is completed when the pH value of obtained pumped well washing water is 6.5-7.5. An ore bed is sealed through the packer, then the chemical well washing agent is directionally injected into the ore bed under the actionof pressure, dilution of a solution in the well to the chemical well washing agent is reduced, precipitates are fully dissolved through the chemical well washing agent, the permeability of the ore bedis recovered, the liquid pumping amount of the production well is increased, and then the well washing effect is improved.

Description

technical field [0001] The invention relates to the technical field of uranium mining by in-situ leaching, in particular to a well washing method for uranium mining by in-situ leaching. Background technique [0002] In-situ leaching uranium mining is a sandstone-type uranium mining method that integrates mining, dressing and smelting, and is widely used in the development of sandstone-type uranium deposits at home and abroad. Worldwide, countries that adopt in-situ leaching for uranium mining mainly include: Kazakhstan, the United States, Australia, Uzbekistan, and China. At present, industrial mining and production have been realized in Xinjiang, Inner Mongolia and other places in my country. In in-situ leaching uranium mining, the production well is the only underground project that exposes the ore layer, and the injection liquid is realized through the filter, that is, the leachate in the liquid extraction well is lifted to the surface by the submersible pump through the...

Claims

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Application Information

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IPC IPC(8): E21B37/06C09K8/52
CPCE21B37/06C09K8/52
Inventor 杨立志任宇原渊
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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