CN-121993140-A - Underground filter for in-situ leaching uranium mining and design and use method thereof

CN121993140ACN 121993140 ACN121993140 ACN 121993140ACN-121993140-A

Abstract

The application discloses an in-situ leaching uranium mining underground filter and a design and use method thereof. The technical field of the in-situ leaching uranium extraction comprises the steps of obtaining the outer diameter of a filter tube, the diameter of an underground mineral layer section and the diameter of an original drilling hole, calculating the target free expansion thickness of an outer layer material of the filter tube based on the outer diameter of the filter tube and the diameter of the mineral layer section, designing an expandable mesh wrapping layer and a degradable constraint layer based on the target free expansion thickness and the diameter of the original drilling hole, and compressing and wrapping the expandable mesh wrapping layer on the outer wall of the filter tube by utilizing the degradable constraint layer to complete the design of the in-situ leaching uranium extraction underground filter, wherein the expandable mesh wrapping layer comprises a permeable supporting layer, an expansion filling layer and a sand prevention protection layer which are sequentially sleeved on the outer wall of the filter tube from inside to outside. The application can solve the technical problems of complicated construction flow, easy damage and difficult control of gravel filling quality of the traditional filter.

Inventors

JIA HAO
ZOU YUHAN
CHENG WEI
Weng Haicheng
LI PO
ZHANG LI
YUAN YUAN
LIAO WENSHENG
XU YING
CHEN MEIFANG
CHEN XIANG
XU GUOLONG

Assignees

核工业北京化工冶金研究院

Dates

Publication Date: 20260508
Application Date: 20260327

Claims (10)

1. The design method of the in-situ leaching uranium mining underground filter is characterized by comprising the following steps of: obtaining the outer diameter of the filter tube, the diameter of the underground mine interval and the diameter of the original drilling hole; Calculating a target free expansion thickness of the filter tube outer layer material based on the outer diameter of the filter tube and the diameter of the seam section; Designing an expandable mesh wrap and a degradable constraint layer based on the target free expansion thickness and the original borehole diameter; And the expandable reticular wrapping layer is laminated and wrapped on the outer wall of the filter pipe by utilizing the degradable constraint layer so as to complete the design of the underground filter for the in-situ leaching uranium mining, wherein the expandable reticular wrapping layer comprises a water permeable supporting layer, an expansion filling layer and a sand prevention protective layer which are sequentially sleeved on the outer wall of the filter pipe from inside to outside.
2. The method of claim 1, wherein the calculating a target free expansion thickness of the filter tube outer layer material based on the outer diameter of the filter tube and the diameter of the mineral seam section comprises: Calculating the thickness of an annular gap formed between the filter tube and the well wall of the ore bed section based on the outer diameter of the filter tube and the diameter of the ore bed section; And calculating the target free expansion thickness of the outer layer material of the filter tube according to the annular gap thickness.
3. The method of claim 1, wherein the designing an expandable mesh wrap and a degradable constraint layer based on the target free-expansion thickness and the raw borehole diameter comprises: based on the target free expansion thickness and the original borehole diameter, respectively constructing a free expansion thickness constraint condition and an original borehole diameter constraint condition; Designing a material type, a target expansion ratio, a free expansion thickness and an initial compression thickness of an inner layer material, a middle layer material and an outer layer material respectively based on the free expansion thickness constraint condition and the original borehole diameter constraint condition, wherein the free expansion thickness constraint condition comprises that the sum of the free expansion thicknesses of the inner layer material, the middle layer material and the outer layer material is larger than the target free expansion thickness, and the original borehole diameter constraint condition comprises that an initial overall outer diameter determined based on the initial compression thicknesses of the inner layer material, the middle layer material and the outer layer material is smaller than the original borehole diameter; designing the water permeable supporting layer, the expansion filling layer and the sand control protecting layer based on the material types, the target expansion multiplying power, the free expansion thickness and the initial compression thickness which are respectively corresponding to the inner layer material, the middle layer material and the outer layer material; Carrying out perforating processing on the permeable supporting layer and the sand control protective layer to obtain a perforated permeable supporting layer and a perforated sand control protective layer; designing the expandable mesh wrapping layer based on the perforated water permeable supporting layer, the expansion filling layer and the perforated sand control protecting layer; Based on the expandable mesh wrap, a degradable constraint layer is designed to wrap outside of the expandable mesh wrap.
4. An in situ leaching uranium downhole filter designed according to the method of any one of claims 1 to 3.
5. A method of using the in situ leaching uranium mining downhole filter of claim 4, including: Obtaining the thickness of a degradable constraint layer of an in-situ leaching uranium mining downhole filter; calculating the lowering speed of the underground filter of the in-situ leaching uranium mining according to the thickness of the degradable constraint layer; Connecting the upper end of the underground uranium mining filter with a packer, and connecting the lower end of the underground uranium mining filter with a sand setting pipe; based on the lowering speed, lowering an in-situ leaching uranium mining downhole filter connected with the packer and the sand setting pipe to a preset mineral deposit depth; After the in-situ leaching uranium mining downhole filter is immersed in water to the preset mineral layer depth, the degradable constraint layer is dissolved, the expandable reticular wrapping layer wrapped on the outer wall of the filter tube is gradually expanded, and an annular gap between the filter tube and the well wall is filled.
6. The method of claim 5, wherein calculating the down-stream velocity of the in-situ uranium mining downhole filter based on the degradable constraint layer thickness comprises: Calculating the degradation time of the constraint layer based on the thickness of the degradable constraint layer; And calculating the dropping speed according to the degradation time of the constraint layer and the preset mineral layer depth.
7. The utility model provides a design device of in situ leaching uranium mining downhole filter which characterized in that includes: the acquisition unit is used for acquiring the outer diameter of the filter pipe, the diameter of the underground mine interval and the diameter of the original drilling hole; a calculation unit for calculating a target free expansion thickness of the filter tube outer layer material based on an outer diameter of the filter tube and a diameter of the mineral seam section; A design unit for designing an expandable mesh wrap and a degradable constraint layer based on the target free expansion thickness and the original borehole diameter; The packaging unit is used for utilizing the degradable constraint layer to laminate and package the expandable reticular packaging layer on the outer wall of the filter tube so as to finish the design of the in-situ leaching uranium mining underground filter, wherein the expandable reticular packaging layer comprises a water permeable supporting layer, an expansion filling layer and a sand prevention protective layer which are sequentially sleeved on the outer wall of the filter tube from inside to outside.
8. An apparatus for using an in situ leaching uranium mining downhole filter, comprising: the acquisition unit is used for acquiring the thickness of the degradable constraint layer of the in-situ leaching uranium mining downhole filter; The calculating unit is used for calculating the lowering speed of the underground filter of the in-situ leaching uranium mining according to the thickness of the degradable constraint layer; the connecting unit is used for connecting the upper end of the underground leaching uranium mining underground filter with the packer and connecting the lower end of the underground leaching uranium mining underground filter with the sand setting pipe; a lowering unit for lowering an in-situ leaching uranium mining downhole filter connected with the packer and the sand setting pipe to a preset mineral deposit depth based on the lowering speed; And the filling unit is used for dissolving the degradable constraint layer after the in-situ leaching uranium mining downhole filter is immersed in water to the preset mineral layer depth, gradually expanding the expandable reticular wrapping layer wrapped on the outer wall of the filter tube, and filling the annular gap between the filter tube and the well wall.
9. A storage medium having stored thereon a computer program, which when executed by a processor, implements the method of any of claims 1 to 3 and/or 5 to 6.
10. An electronic device comprising a storage medium, a processor and a computer program stored on the storage medium and executable on the processor, characterized in that the processor implements the method of any one of claims 1 to 3 and/or 5 to 6 when executing the computer program.

Description

Underground filter for in-situ leaching uranium mining and design and use method thereof Technical Field The application relates to the technical field of in-situ leaching uranium extraction, in particular to an in-situ leaching uranium underground filter and a design and use method thereof. Background The in-situ leaching uranium mining drill hole is a passage for leaching agents and leaching agents to enter and exit the ore bed, and the quality of a filter section in the passage directly determines the uranium concentration and the liquid extraction and injection amount of the leaching agents, so that the in-situ leaching uranium mining drill hole has key influence on the recovery rate and the mining cost of mine resources. At present, a conventional filter is usually combined with a gravel filling well forming process when in use, namely, after the filter is lowered to a target ore layer, quartz sand or gravel is pumped into an annulus between the outer wall of the filter and the borehole wall through a gravel throwing pipe column to form an artificial filter layer so as to prevent fine sand of the ore layer from directly entering the filter and support the borehole wall. However, the gravel throwing operation needs to stretch the gravel throwing pipe column into the inner cavity of the filter, the ceramic layer is exposed on one side of the inner cavity, mechanical collision is easy to occur between the pipe column and brittle ceramic in the lifting process, the filter layer is damaged, the gravel throwing process itself increases on-site construction links including gravel slurry preparation, pumping parameter control, gravel throwing valve opening and closing monitoring and the like, the process is complicated, the experience dependence on operators is high, and moreover, the gravel filling effect is influenced by multiple factors such as gravel grading, pumping displacement, annulus size and the like, and uneven gravel distribution or partial cavity conditions are easy to occur, so that the sand prevention effect is influenced. Disclosure of Invention In view of the above, the application provides an in-situ leaching uranium mining underground filter and a design and use method thereof, and mainly aims to solve the technical problems that the conventional filter is complex in construction process, easy to damage and difficult to control gravel filling quality. According to a first aspect of the application, there is provided a method of designing a filter downhole for in situ leaching uranium, the method comprising: obtaining the outer diameter of the filter tube, the diameter of the underground mine interval and the diameter of the original drilling hole; Calculating a target free expansion thickness of the filter tube outer layer material based on the outer diameter of the filter tube and the diameter of the seam section; Designing an expandable mesh wrap and a degradable constraint layer based on the target free expansion thickness and the original borehole diameter; And the expandable reticular wrapping layer is laminated and wrapped on the outer wall of the filter pipe by utilizing the degradable constraint layer so as to complete the design of the underground filter for the in-situ leaching uranium mining, wherein the expandable reticular wrapping layer comprises a water permeable supporting layer, an expansion filling layer and a sand prevention protective layer which are sequentially sleeved on the outer wall of the filter pipe from inside to outside. According to a second aspect of the application there is provided a subsurface filter for in situ leaching uranium mining designed using the method described above. According to a third aspect of the application there is provided a method of using a in situ leaching uranium mining downhole filter, the method including: Obtaining the thickness of a degradable constraint layer of an in-situ leaching uranium mining downhole filter; calculating the lowering speed of the underground filter of the in-situ leaching uranium mining according to the thickness of the degradable constraint layer; Connecting the upper end of the underground uranium mining filter with a packer, and connecting the lower end of the underground uranium mining filter with a sand setting pipe; based on the lowering speed, lowering an in-situ leaching uranium mining downhole filter connected with the packer and the sand setting pipe to a preset mineral deposit depth; After the in-situ leaching uranium mining downhole filter is immersed in water to the preset mineral layer depth, the degradable constraint layer is dissolved, the expandable reticular wrapping layer wrapped on the outer wall of the filter tube is gradually expanded, and an annular gap between the filter tube and the well wall is filled. According to a fourth aspect of the application there is provided a design apparatus for an in situ leaching uranium mining downhole filter, the apparatus comprising: the acquisition u