CN116307439B - Liquid injection well flow distribution method of boundary on-site leaching unit - Google Patents
Liquid injection well flow distribution method of boundary on-site leaching unit Download PDFInfo
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- 238000002386 leaching Methods 0.000 title claims abstract description 112
- 239000007788 liquid Substances 0.000 title claims abstract description 85
- 238000002347 injection Methods 0.000 title claims abstract description 71
- 239000007924 injection Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000009826 distribution Methods 0.000 title claims abstract description 16
- 238000011065 in-situ storage Methods 0.000 claims abstract description 48
- 238000005086 pumping Methods 0.000 claims abstract description 33
- 229910052770 Uranium Inorganic materials 0.000 claims abstract description 22
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000000605 extraction Methods 0.000 claims abstract description 16
- 238000005065 mining Methods 0.000 claims abstract description 15
- 238000004891 communication Methods 0.000 claims description 2
- 238000007654 immersion Methods 0.000 claims description 2
- 238000013508 migration Methods 0.000 abstract description 8
- 230000005012 migration Effects 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000003673 groundwater Substances 0.000 abstract description 4
- 238000009792 diffusion process Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910001727 uranium mineral Inorganic materials 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/28—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent
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Abstract
The invention provides a liquid injection well flow distribution method of a boundary on-site leaching unit, which comprises the following steps: determining the liquid extraction amount of each in-situ leaching unit on the boundary of the in-situ leaching uranium mining area; determining that the pumping ratio of the in-situ leaching unit is larger than the injection ratio; calculating the total liquid injection amount of each in-situ leaching unit by using the in-situ leaching unit to pump more than the liquid injection proportion; classifying the liquid injection wells of the on-site leaching units on the boundary according to the hydraulic connection; and calculating the liquid injection amount of each type of liquid injection well. The invention can reasonably distribute the flow of each production well in the on-site leaching boundary pumping and injecting unit, so that the injecting liquid of each on-site leaching unit can maintain a dropping funnel taking a well site as the center, so as to ensure that the leaching liquid always flows to the pumping well, thereby controlling the migration and diffusion of the leaching liquid to the periphery to the greatest extent and protecting the on-site leaching groundwater environment.
Description
Technical Field
The invention relates to the field of ground water pollution control of in-situ leaching uranium mining, in particular to a liquid injection well flow distribution method of a boundary in-situ leaching unit.
Background
The in-situ leaching uranium extraction is realized by arranging a plurality of in-situ leaching units on the surface of a ore body, wherein each in-situ leaching unit is generally provided with a liquid pumping hole in the center, a plurality of liquid injection holes are uniformly distributed around the in-situ leaching unit, the conventional in-situ leaching units are five-point type and seven-point type, the five-point type in-situ leaching unit comprises four liquid injection wells surrounding one liquid pumping well, and the seven-point type in-situ leaching unit comprises six liquid injection wells surrounding one liquid pumping well. Injecting leaching solution into the mineral-containing aquifer through the liquid injection well to oxidize stable tetravalent uranium in uranium minerals in the underground stratum into hexavalent uranium easy to migrate, and pumping the leaching solution to the surface through the liquid pumping well for subsequent treatment. The in-situ leaching uranium extraction process has the advantages of mature process, low production cost, small environmental impact and the like, and has gradually become the main stream process for uranium ore production in China.
While uranium ore in-situ leaching is a semi-open system, the leaching agent injected into the underground aquifer diffuses to the surroundings, thereby affecting the groundwater environment. In the process of in-situ leaching uranium extraction, in order to reduce the influence on surrounding groundwater environment and improve leaching efficiency, an operation principle that the liquid extraction amount is larger than the liquid injection amount is often adopted, namely, a dropping funnel which is larger than the liquid injection ratio and enables an underground water flow field to form and maintain a well field as a center is selected, so that the leachate is ensured to flow to a liquid extraction well all the time.
In the conventional design and production of an in-situ leaching mine, the pumping and injecting flow rate is generally distributed by adopting an arithmetic average method, namely, the total pumping/injecting liquid amount of the whole well site is divided by the total pumping/injecting well number to obtain single-hole pumping/injecting liquid amount, and the flow rates of all liquid injecting holes or liquid pumping holes are consistent. Although the distribution mode enables underground water at a well site to form a dropping funnel in general so as to control the dispersion of leaching solution, at the boundary of the well site, the liquid injection amount at the boundary is larger due to the arithmetic average distribution of flow, so that the local water level is slightly higher, and a certain leaching solution is forced to diffuse to the periphery, so that the influence range of the underground water is overlarge.
Currently, uranium mining and metallurgy radiation protection and radiation environment protection regulations (GB 23727-2020) require that the leaching boundary pumping and injection unit pump be greater than the injection ratio and not less than 0.5%, but no unified method exists at present for how to reasonably distribute the flow of each production well in the leaching boundary pumping and injection unit. There are two main ways to increase the pumping and injecting ratio, namely, to increase the pumping amount and to decrease the injecting amount. The liquid extraction amount at the center of the in-situ leaching unit is increased to dilute the leaching liquid, so that the production efficiency is affected, the surface wastewater amount is increased due to the increase of the liquid extraction amount, the evaporation tank and the surface wastewater treatment are both required to be high, and the economic benefit is reduced.
Disclosure of Invention
The invention aims to provide a liquid injection well flow distribution method of a boundary on-site leaching unit, which aims to solve the problems that the existing on-site leaching unit is large in liquid injection amount, so that local water level is slightly high, and the influence range on underground water is overlarge.
The invention is realized in the following way: a liquid injection well flow distribution method of a boundary on-site leaching unit comprises the following steps: determining the liquid extraction amount of each in-situ leaching unit on the boundary of the in-situ leaching uranium mining area; determining that the pumping ratio of the in-situ leaching unit is larger than the injection ratio; calculating the total liquid injection amount of each in-situ leaching unit by using the in-situ leaching unit to pump more than the liquid injection proportion; classifying the liquid injection wells of the on-site leaching units on the boundary according to the hydraulic connection; and calculating the liquid injection amount of each type of liquid injection well.
A liquid injection well flow distribution method of a boundary on-site leaching unit comprises the following steps:
A. determining the liquid extraction amount of each in-situ leaching unit of the boundary according to the geological condition and the in-situ leaching process of the in-situ leaching uranium mining area, and marking as Q i-drawer I is the i-th in-situ leaching unit;
B. determining that the pumping ratio of the boundary in-situ leaching unit is larger than the injection ratio a according to geological conditions of the in-situ leaching uranium mining area and related technical specification requirements;
C. calculating the total liquid injection quantity Q of each immersion unit at the boundary i annotate ：
D. According to the hydraulic connection between each liquid injection well and each liquid pumping well, the liquid injection wells of the boundary on-site leaching units are divided into n types: class 1 well means in hydraulic communication with 1 drainage well at each end of the panel; the type 2 well is used for being hydraulically connected with two liquid pumping wells and serving two in-situ leaching units, and is positioned at the joint of the outer boundaries of the two in-situ leaching units on the boundary; … … the nth type well means that there is hydraulic connection with n pumping wells, and n in-situ leaching units are served at the connection part of the boundary in-situ leaching units and the internal in-situ leaching units;
E. calculating the liquid injection quantity Q of each type of liquid injection well n ：
Wherein Q is m-note A total injection amount of the on-site leaching unit hydraulically connected with the required injection well; m is the number of liquid injection wells contained in the corresponding leaching unit.
The boundary dip cell pump in step B is greater than 0.5% of the injection ratio a.
The invention can reasonably distribute the flow of each production well in the on-site leaching boundary pumping and injecting unit under the condition that the pumping and injecting ratio of the on-site leaching boundary pumping and injecting unit is not less than 0.5%, so that the liquid injection of each on-site leaching unit can maintain a dropping funnel taking a well site as the center to ensure that the leaching liquid always flows to the liquid pumping well, thereby controlling the peripheral migration and diffusion of the leaching liquid to the greatest extent and protecting the on-site leaching groundwater environment. The invention maintains a dropping funnel with the well site as the center so as to ensure that the leaching liquid always flows to the liquid pumping well.
Drawings
FIG. 1 is a schematic diagram of a classification structure of a liquid injection well of a five-point boundary dip unit.
FIG. 2 is a schematic diagram of a classification structure of a liquid injection well of a seven-point boundary dip unit.
FIG. 3 is a schematic diagram of a five-point boundary dip unit configuration calculated using the present invention.
FIG. 4 is a schematic diagram of a seven-point boundary dip cell configuration calculated using the present invention.
Detailed Description
Example 1
The invention provides a method for distributing the flow of an injection well of an on-site leaching unit at the boundary of an on-site leaching uranium mining area, which comprises the following steps:
s1, determining the liquid extraction amount of each on-site leaching unit at the boundary of an on-site leaching area according to the geological condition and the on-site leaching process of the on-site leaching uranium mining area, numbering each on-site leaching unit, and marking the liquid extraction amount of each point unit as Q i-drawer Wherein i represents an i-th in-situ leaching unit;
s2, determining that boundary on-site leaching unit extraction is larger than an injection ratio a according to address conditions of an on-site leaching uranium mining area and related technical specification requirements, wherein a in the embodiment is a numerical value larger than 0.5% so as to meet the technical specification requirements of on-site leaching uranium mining;
s3, calculating the total injection amount of each in-situ leaching unit on the boundary of the in-situ leaching uranium mining area, and marking as Q i annotate ，Q i annotate The method is characterized by comprising the following steps:
s4, in the on-site leaching unit, hydraulic connection is established between each liquid injection well and each liquid extraction well, and according to the hydraulic connection, the liquid injection wells of the on-site leaching unit on the boundary are divided into n types: class 1 indicates that there is a hydraulic connection to 1 drainage well, typically at each end point; the class 2 well is in hydraulic connection with the two liquid extraction wells and serves two ground leaching units at the same time, and is positioned at the joint of the outer boundaries of the two ground leaching units on the boundary; by analogy, the nth type well is in hydraulic connection with the n liquid pumping wells and serves n on-site leaching units, and is positioned at the joint of the boundary on-site leaching units and the internal on-site leaching units; as shown in fig. 1 and 2, the five-point type and seven-point type injection wells are classified into 4 types, and the seven-point type injection wells are classified into 3 types;
s5, calculating the liquid injection quantity Qn of each type of liquid injection well, wherein the calculation formula is as follows:
in the above, Q m-note A total injection amount of the on-site leaching unit hydraulically connected with the required injection well; m is the number of liquid injection wells contained in the corresponding leaching unit.
Example 2
Fig. 3 shows that a uranium mining mine leached in situ is of a five-point type, and the flow rates of various liquid injection wells are distributed according to example 1, and the results are shown in table 1. Compared with the prior arithmetic average distribution method, the downstream migration distance of the leaching solution is reduced from 235m to 210m and U Natural material The migration distance is reduced by 11%, and the migration area is reduced by 16%.
Table 1 "five-point" well type boundary liquid injection well flow distribution meter
Example 3
Fig. 4 shows that a certain in-situ leaching uranium mining mine is mainly arranged in a seven-point type well shape, and irregular well shape arrangement is assisted at a narrow or corner part of a mine body. The boundary on-site leaching unit injection well flow distribution method is adopted to distribute the injection well flow of the boundary on-site leaching unit, and the results are shown in Table 2. Through detection, compared with the conventional arithmetic average distribution method, the distribution method adopted by the invention has the advantages that the downstream migration distance of the leaching solution is reduced from 271m to 178 m, the U natural migration distance is reduced by 34%, and the migration area is reduced by 37%.
Table 2 "seven-point" well type boundary liquid injection well flow distribution meter
Claims (2)
1. The liquid injection well flow distribution method of the boundary on-site leaching unit is characterized by comprising the following steps of:
A. determining the liquid extraction amount of each in-situ leaching unit of the boundary according to the geological condition and the in-situ leaching process of the in-situ leaching uranium mining area, and marking as Q i-drawer I is the i-th in-situ leaching unit;
B. determining that the pumping ratio of the boundary in-situ leaching unit is larger than the injection ratio a according to geological conditions of the in-situ leaching uranium mining area and related technical specification requirements;
C. calculating the total liquid injection quantity Q of each immersion unit at the boundary i annotate ：
D. According to the hydraulic connection between each liquid injection well and each liquid pumping well, the liquid injection wells of the boundary on-site leaching units are divided into n types: class 1 well means in hydraulic communication with 1 drainage well at each end of the panel; the type 2 well is used for being hydraulically connected with two liquid pumping wells and serving two in-situ leaching units, and is positioned at the joint of the outer boundaries of the two in-situ leaching units on the boundary; similarly, the nth type well means that the nth type well is hydraulically connected with the n liquid pumping wells and serves n on-site leaching units, and is positioned at the joint of the boundary on-site leaching units and the internal on-site leaching units;
E. calculating the liquid injection quantity Q of each type of liquid injection well n ：
Wherein Q is m-note A total injection amount of the on-site leaching unit hydraulically connected with the required injection well; m is the number of liquid injection wells contained in the corresponding leaching unit.
2. The method for distributing the flow rate of the liquid injection well of the boundary leaching unit according to claim 1, wherein the pumping rate of the boundary leaching unit in the step B is more than 0.5 percent.
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