A method for repairing damaged boreholes in in-situ leaching uranium mining with expansion materials

Abstract

The invention belongs to the technical field of mine production for in-situ leaching uranium mining, and particularly relates to a method for repairing a damaged drilled hole for in-situ leaching uranium mining through a plurality of layers of expanding materials. The method sequentially includes the following steps that whether a well pipe (1) or a filter is damaged is initially judged; under the condition that the well pipe (1) is damaged, the cracked position of the well pipe (1) is determined through well logging, a plastic smaller than the well pipe (1) in inner diameter serves as a casing pipe (3), the expanding materials (2) are wound around the casing pipe (3), the casing pipe (3) is put downwards to align with the cracked position of the well pipe (1), and the expanding materials (2) expand and squeeze the inner wall of the well pipe (1) to form a new channel; under the condition that the filter is damaged, the drilled hole is washed to be clean, the expanding materials (2) are wound around a built-in filter smaller than the original filter in outer diameter, the built-in filter is put downwards to be close to the original filter (4), the expanding materials (2) expand when making contact with water and squeeze the well pipe (1), and a new filter is formed in the drilled hole.

Description

technical field [0001] The invention belongs to the technical field of uranium ore production, in particular to a method for repairing the damage of uranium mining drilling holes. Background technique [0002] In recent years, in-situ leaching mining technology has developed rapidly in low-grade sandstone-type uranium deposits, and drilling is an important way and link to realize in-situ leaching uranium production. In-situ leaching uranium mining injects the leaching solution into the ore layer through the liquid injection hole, and lifts the leaching solution to the surface through the liquid pumping hole. It is through these special "channels" of drilling that the in-situ leaching cycle process of continuous pumping and injection is realized. At present, my country's in-situ leaching technology drilling mainly adopts gravel-filled structures, and plastic pipes are used as well pipes. Due to the relatively small toughness of plastic pipes, many factors such as the extrusi...

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Problems solved by technology

[0009] The purpose of the present invention is to provide a kind of repairing ground leaching uranium damage drill suitable for the characteristics of ground leaching uranium production drilling for technical problems such as leachate dilution caused by well pipe and filter damage, leaching uranium concentration reduction or sediment amount increase. hole method to achieve the purpose of restoring the normal circulation pumping function of drilling

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