CN111878039A - Well washing method for in-situ leaching uranium mining - Google Patents
Well washing method for in-situ leaching uranium mining Download PDFInfo
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- CN111878039A CN111878039A CN202010766727.6A CN202010766727A CN111878039A CN 111878039 A CN111878039 A CN 111878039A CN 202010766727 A CN202010766727 A CN 202010766727A CN 111878039 A CN111878039 A CN 111878039A
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- 229910052770 Uranium Inorganic materials 0.000 title claims abstract description 40
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005065 mining Methods 0.000 title claims abstract description 19
- 238000002386 leaching Methods 0.000 title claims abstract description 18
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 16
- 238000005406 washing Methods 0.000 title claims description 38
- 238000011010 flushing procedure Methods 0.000 claims abstract description 66
- 239000000126 substance Substances 0.000 claims abstract description 55
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000004519 manufacturing process Methods 0.000 claims abstract description 35
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 24
- 239000011707 mineral Substances 0.000 claims abstract description 24
- 238000005086 pumping Methods 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 238000004090 dissolution Methods 0.000 claims abstract description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 26
- 229910001220 stainless steel Inorganic materials 0.000 claims description 19
- 239000010935 stainless steel Substances 0.000 claims description 19
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 claims description 13
- 230000000694 effects Effects 0.000 abstract description 4
- 230000035699 permeability Effects 0.000 abstract description 4
- 239000000243 solution Substances 0.000 abstract description 4
- 238000010790 dilution Methods 0.000 abstract description 3
- 239000012895 dilution Substances 0.000 abstract description 3
- 239000002244 precipitate Substances 0.000 abstract description 3
- 238000002347 injection Methods 0.000 description 22
- 239000007924 injection Substances 0.000 description 22
- 239000007788 liquid Substances 0.000 description 16
- 239000000463 material Substances 0.000 description 9
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000033558 biomineral tissue development Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 229920011532 unplasticized polyvinyl chloride Polymers 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- QWQYQTKEPIAVEH-UHFFFAOYSA-J S(N)([O-])(=O)=O.[Mg+2].[Ca+2].S(N)([O-])(=O)=O.S(N)([O-])(=O)=O.S(N)([O-])(=O)=O Chemical compound S(N)([O-])(=O)=O.[Mg+2].[Ca+2].S(N)([O-])(=O)=O.S(N)([O-])(=O)=O.S(N)([O-])(=O)=O QWQYQTKEPIAVEH-UHFFFAOYSA-J 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- IIACRCGMVDHOTQ-UHFFFAOYSA-M sulfamate Chemical compound NS([O-])(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-M 0.000 description 1
Classifications
-
- 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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a well flushing method for in-situ leaching uranium mining, and belongs to the technical field of in-situ leaching uranium mining. The method comprises the steps of (1) putting a packer into a uranium deposit production well to the upper surface of a filter; injecting water into the packer for pressurization to realize setting of the packer; injecting a chemical well-flushing agent into the mineral deposit through the packer, wherein the chemical well-flushing agent and the mineral deposit are subjected to a mud-skin dissolution reaction; and after the mud skin is dissolved and reacted, unsealing the packer, lifting the packer to the ground surface, then pumping water to the uranium deposit production well, and completing well flushing when the pH value of the obtained pumped well flushing water is 6.5-7.5. According to the invention, the mineral layer is sealed by the packer, then the chemical well-flushing agent is directionally injected into the mineral layer under the action of pressure, the dilution of the chemical well-flushing agent by the solution in the well is reduced, the precipitate is fully dissolved by the chemical well-flushing agent, the permeability of the mineral layer is recovered, the liquid-pumping quantity of the production well is increased, and the well-flushing effect is further improved.
Description
Technical Field
The invention relates to the technical field of in-situ leaching uranium mining, in particular to a well flushing method for in-situ leaching uranium mining.
Background
The in-situ leaching uranium mining is a sandstone-type uranium ore mining method integrating mining, selecting and smelting, and is widely applied to the development of sandstone-type uranium ore deposits at home and abroad. Worldwide, the countries that adopt the in-situ leaching uranium mining method mainly include: hassakstan, usa, australia, uzbekistan and china, etc. At present, industrialized mining production is realized in Xinjiang, inner Mongolia and other places in China. In the in-situ leaching uranium mining, a production well is the only underground engineering for disclosing an ore bed, the pumping and injecting liquid is realized through a filter, namely, the leaching liquid of a pumping well is lifted to the ground surface by a submersible pump through the filter, and the leaching agent injected into a liquid injection well is immersed into the ore bed through the filter.
Production wells are often plugged to varying degrees during operation. Causes of well plugging include mainly chemical plugging, mechanical plugging, gas plugging and plugging associated with ion exchange. Generally, gas plugging and ion exchange related plugging are recoverable plugging, and after well flushing, permeability may increase beyond initial values.
The well washing refers to well washing of a finished well after hole drilling and hole sealing and well washing of filter blockage in production. Well washing methods are numerous, such as compressed air hole washing, piston well washing, chemical well washing, jet well washing, and the like. When the chemical well washing is mainly used for washing, the chemical well washing agent is contacted with the mud skin, and the mud skin is dissolved by chemical reaction and is brought to the surface of the ground after water is pumped. In the in-situ leaching uranium mining, industrial hydrochloric acid or hydrofluoric acid is used for chemical well washing, the hydrochloric acid or the hydrofluoric acid is directly poured into a production well from a wellhead to be soaked for 1-2 days, and then an air compressor is used for washing out residual acid. The method is simple to operate, but the well washing effect is not good due to the direct addition of the high-concentration industrial acid.
Disclosure of Invention
In view of the above, the present invention aims to provide a well-flushing method for in-situ leaching uranium mining. According to the invention, the mineral layer is sealed by the packer, then the chemical well-flushing agent is directionally injected into the mineral layer, the dilution of the chemical well-flushing agent by the solution in the well is reduced, the precipitate is fully dissolved by the chemical well-flushing agent, the permeability of the mineral layer is recovered, the liquid-pumping quantity of the production well is increased, and the well-flushing effect is further improved.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a well washing method for in-situ leaching uranium mining, which comprises the following steps:
lowering a packer into a uranium deposit production well to an upper surface of a filter, wherein the packer is not in contact with the filter;
injecting water into the packer for pressurization to realize setting of the packer;
injecting a chemical well-flushing agent into the mineral deposit through the packer, and then carrying out a mud-skin dissolution reaction on the chemical well-flushing agent and the mineral deposit;
and after the mud skin is dissolved and reacted, unsealing the packer, lifting the packer to the ground surface, then pumping water to the uranium deposit production well, and completing well flushing when the pH value of the obtained pumped well flushing water is 6.5-7.5.
Preferably, the distance between the bottom of the packer and the upper surface of the filter is 2.0-3.0 m.
Preferably, the pressurization is carried out until the pressure is 4.0-5.0 MPa.
Preferably, the chemical well-flushing agent comprises the following components in percentage by mass: 0.5 to 2.0 percent of sulfamic acid, 1.5 to 4 percent of hydrochloric acid and the balance of water.
Preferably, the chemical well-flushing agent comprises the following components in percentage by mass: 0.8 to 1.5 percent of sulfamic acid, 2 to 3.2 percent of hydrochloric acid and the balance of water.
Preferably, the amount of the chemical well-flushing agent injected per meter of length of the filter is 3.2-4.8 m3。
Preferably, the time of the mud peel dissolution reaction is 16-48 h.
Preferably, the pH value is 6.8-7.2.
Preferably, the run in packer uses a 316L stainless steel pipe.
Preferably, the chemical well-wash is injected into the seam through a 316L stainless steel pipe.
The invention provides a well washing method for in-situ leaching uranium mining, which comprises the following steps: lowering a packer into a uranium deposit production well to an upper surface of a filter, wherein the packer is not in contact with the filter; injecting water into the packer for pressurization to realize setting of the packer; injecting a chemical well-flushing agent into the mineral deposit through the packer, and then carrying out a mud-skin dissolution reaction on the chemical well-flushing agent and the mineral deposit; and after the mud skin is dissolved and reacted, unsealing the packer, lifting the packer to the ground surface, then pumping water to the uranium deposit production well, and completing well flushing when the pH value of the obtained pumped well flushing water is 6.5-7.5. According to the invention, the mineral layer is sealed by the packer, then the chemical well-flushing agent is directionally injected into the mineral layer under the action of pressure, the dilution of the chemical well-flushing agent by the solution in the well is reduced, the precipitate is fully dissolved by the chemical well-flushing agent, the permeability of the mineral layer is recovered, the liquid-pumping quantity of the production well is increased, the well-flushing effect is further improved, and the liquid-pumping quantity of the production well is increased. The data of the examples show that the average pumping capacity of the production well is improved by 21.6-26.2% by using the well washing method provided by the invention.
Detailed Description
The invention provides a well washing method for in-situ leaching uranium mining, which comprises the following steps:
lowering a packer into a uranium deposit production well to an upper surface of a filter, wherein the packer is not in contact with the filter;
injecting water into the packer for pressurization to realize setting of the packer;
injecting a chemical well-flushing agent into the mineral deposit through the packer, wherein the chemical well-flushing agent and the mineral deposit are subjected to a mud-skin dissolution reaction;
and after the mudstone is dissolved and reacted, unsealing the packer, lifting the packer to the ground surface, pumping water to the uranium deposit production well, and completing well flushing when the pH value of the obtained pumped well flushing water is 6.5-7.5.
The packer is lowered into the uranium deposit production well to the upper surface of the filter. The specific position of the uranium deposit is not particularly limited, and the uranium deposit with stable sand body development and good connectivity is selected if the lithology of the sand body is mainly coarse-grain sandstone and gravel-containing coarse-grain sandstone.
The specification of the production well is not specially limited, and the packer can be set.
In the invention, the packer can be put into a well and can play a sealing role, and the material of the packer is preferably stainless steel or PVC.
In the present invention, the running packer preferably uses a 316L stainless steel pipe.
In the invention, the bottom of the packer is preferably 2.0-3.0 m away from the upper surface of the filter, and more preferably 2.2-2.5 m away from the upper surface of the filter.
In the present invention, the filter is preferably an annular exoskeleton filter, and the source of the filter is not particularly limited in the present invention, and commercially available products well known to those skilled in the art may be used.
After the packer is put in, the invention injects water into the packer to pressurize, thus realizing the setting of the packer. The invention has no requirement on the injection rate, water is injected through the 316L stainless steel pipe after the packer is put in, and the 316L stainless steel pipe is not removed after the injection is finished and is continuously used.
In the present invention, the water is preferably clear water. The present invention is preferably pressurized by injecting fresh water using a slurry pump.
After the packer is set, the chemical well-flushing agent is injected into the mineral layer through the packer, and the chemical well-flushing agent and the mineral layer are subjected to a mud-skin dissolution reaction.
In the present invention, the chemical well-flushing agent preferably comprises the following components in parts by mass: 0.5 to 2.0 percent of sulfamic acid, 1.5 to 4 percent of hydrochloric acid and the balance of water.
In the invention, the mass fraction of the sulfamic acid is preferably 0.8-1.5%, the sulfamic acid is medium strong acid, has the general acidity, can be chemically reacted with various substances, and has high solubility in water of calcium magnesium sulfamate and ferric sulfamate which are obtained by the dissolution reaction of the sulfamic acid and chemical plugs.
In the invention, the mass fraction of the hydrochloric acid is preferably 2-3.2%, and the hydrochloric acid has the function of dissolving chemical plugs such as calcium, magnesium, iron and the like and has the basically same function as sulfamic acid.
In the present invention, the water is preferably clear water.
The preparation method of the chemical well-flushing agent is not particularly limited, and the chemical well-flushing agent can be prepared by adopting a preparation method of a composition well-known to a person skilled in the art.
In the present invention, the chemical well-flushing agent is injected per meter of filter lengthThe amount of (B) is preferably 3.2 to 4.8m3More preferably 3.5 to 4.4m3。
In the present invention, the chemical well-wash is preferably injected into the seam through a 316L stainless steel pipe, and in a specific embodiment of the invention, a chemical well-wash is preferably injected into the seam through a packer using an injection pump through a 316L stainless steel pipe.
In the invention, the time for the dissolution reaction of the mud peel is preferably 16-48 h, and more preferably 20-42 h.
After the mud skin is dissolved and reacted, the packer is lifted to the ground surface, then the uranium deposit production well is pumped, and the well flushing is completed when the pH value of the pumped well flushing water is 6.5-7.5.
In the invention, the pH value is preferably 6.8-7.2. The method for measuring the pH in the present invention is not particularly limited, and a method known to those skilled in the art may be used.
For further illustration of the present invention, the method of flushing a well by in-situ leaching uranium mining provided by the present invention is described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The uranium mineralization occurrence depth of a certain uranium deposit industry is 308.2-332.6 m, and the average thickness of an ore layer is 12.0 m. The C0109 production well is a liquid extraction well, the specification of the casing is phi 152 multiplied by 12mm, and the material is UPVC material. The filter is an annular outer skeleton filter, the position of the filter is 314.2-322.9 m, and the length of the filter is 8.7 m.
Step one, a 316L stainless steel pipe with the specification of phi 63 multiplied by 4.5mm is used, a packer is put into a C0109 production well, the bottom of the packer is placed at 312.0m and the distance from the bottom of the packer to the upper surface of a filter is 2.2 m;
step two: injecting clean water through a stainless steel pipe by using a liquid injection pump for pressurization, and realizing setting by using a packer when the pressure reaches 4.2 MPa;
step three: a chemical well-flushing agent is injected into the mineral seam through the packer by using an injection pump through a 316L stainless steel pipe. The chemical well-flushing agent is prepared from 0.8% of sulfamic acid (by mass), 1.5% of hydrochloric acid (by mass) and the balance of clear waterAnd (3) water. The injection amount was 30.45m3(i.e. 3.5m per meter of filter charge)3). After the injection is finished, the chemical well-flushing agent reacts with the ore bed for 20 hours;
step four: and lifting the steel pipe and the packer upwards, unsealing the packer when the lifting force reaches 5.5kN, lifting the packer to the ground surface, putting the submersible pump downwards to pump water, and finishing well washing when the pH value of well washing water reaches 6.8.
After the well washing is finished, the average pumping liquid amount of the C0109 production well reaches 5.8m3The oil/h is improved by 21.6 percent compared with that before well washing.
Example 2
The uranium mineralization occurrence depth of a certain uranium deposit industry is 344.9-368.5 m, and the lithology of sand bodies is mainly fine sandstone and siltstone. The SC02 production well is a liquid extraction well, the specification of the casing is phi 152 multiplied by 12mm, and the material is UPVC material. The filter is an annular outer skeleton filter, the filter position is 350.1-359.2 m, and the filter length is 9.1 m.
Step one, a 316L stainless steel pipe with the specification of phi 63 multiplied by 4.5mm is used, a packer is put into a production well of SY02, the bottom of the packer is placed at 347.6m and is 2.5m away from the upper end of a filter;
step two: injecting clear water by using a liquid injection pump for pressurization, and realizing setting by using the packer when the pressure reaches 4.8 MPa;
step three: a chemical well-flushing agent is injected into the mineral seam through the packer by using an injection pump through a 316L stainless steel pipe. The chemical well-flushing agent is prepared from 1.5% of sulfamic acid (mass fraction), 3.2% of hydrochloric acid (mass fraction) and the balance of clear water. The injection amount was 40.04m3(i.e. 4.4m per meter of filter charge3) After the injection is finished, the chemical well-flushing agent reacts with the ore bed for 42 hours;
step four: and lifting the steel pipe and the packer upwards, unsealing the packer when the lifting force reaches 12.6kN, lifting the packer to the ground surface, putting the submersible pump downwards to pump water, and finishing well washing when the pH value of well washing water reaches 7.2.
After the well washing is finished, the average liquid pumping amount of the SC02 production well reaches 4.3m3The/h is improved by 26.2 percent compared with that before well washing.
Example 3
The uranium mineralization occurrence depth of a certain uranium deposit industry is 375.85-386.05 m, and the average thickness of an ore layer is 8.3 m. The SC106 production well is a liquid extraction well, the specification of the casing is phi 152 multiplied by 12mm, and the material is UPVC material. The filter is an annular outer skeleton filter, the filter position is 376.95-384.55 m, and the length is 7.6 m.
Step one, a 316L stainless steel pipe with the specification of phi 63 multiplied by 4.5mm is used, a packer is put into a C0109 production well, the bottom of the packer is placed at 374.55m and the distance from the bottom of the packer to the upper surface of a filter is 2.4 m;
step two: injecting clear water by using a liquid injection pump for pressurization, and realizing setting by using the packer when the pressure reaches 4.5 MPa;
step three: a chemical well-flushing agent is injected into the mineral seam through the packer by using an injection pump through a 316L stainless steel pipe. The chemical well-flushing agent is prepared from 0.96 percent (mass fraction) of sulfamic acid, 2.4 percent (mass fraction) of hydrochloric acid and the balance of clear water. The injection amount was 28.12m3(i.e. 3.7m per filter injection)3). After the injection is finished, the chemical well-flushing agent reacts with the ore bed for 20 hours;
step four: and lifting the steel pipe and the packer upwards, unsealing the packer when the lifting force reaches 14.7kN, lifting the packer to the ground surface, putting the submersible pump downwards to pump water, and finishing well washing when the pH value of well washing water reaches 6.9.
After the well washing is finished, the average pumping liquid volume of the SC106 production well reaches 4.9m3The/h is improved by 20.7 percent compared with that before well washing.
Example 4
The uranium mineralization occurrence depth of a certain uranium deposit industry is 247.28.9-261.03 m, and the average thickness of an ore layer is 6.2 m. The C0310 production well is a liquid pumping well, the specification of the casing pipe is phi 152 multiplied by 12mm, and the material is UPVC material. The filter is an annular outer skeleton filter, the filter position is 255.43 ~ 260.03m, and the filter length is 4.6 m.
Step one, a 316L stainless steel pipe with the specification of phi 63 multiplied by 4.5mm is used, a packer is put into a C0310 production well, the bottom of the packer is placed at 252.63m, and the distance from the bottom of the packer to the upper end of a filter is 2.8 m;
step two: injecting clear water by using a liquid injection pump for pressurization, and realizing setting by using the packer when the pressure reaches 4.4 MPa;
step three: passing through 316L stainless steel pipe by using liquid injection pumpAnd injecting a chemical well-flushing agent into the ore layer through the packer. The chemical well-flushing agent is prepared from 1.6% of sulfamic acid (mass fraction), 2.8% of hydrochloric acid (mass fraction) and the balance of clear water. The injection amount was 19.32m3(i.e. 4.2m injection per meter filter3) After the injection is finished, the chemical well-flushing agent reacts with the ore bed for 48 hours;
step four: and lifting the steel pipe and the packer upwards, unsealing the packer when the lifting force reaches 11.4kN, lifting the packer to the ground surface, putting the submersible pump downwards to pump water, and finishing well washing when the pH value of well washing water reaches 7.4. After the well washing is finished, the average pumping liquid volume of the C0310 production well reaches 3.9m3The/h is improved by 19.6 percent compared with that before well washing.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (10)
1. A well flushing method for in-situ leaching uranium mining comprises the following steps:
lowering a packer into a uranium deposit production well to an upper surface of a filter, wherein the packer is not in contact with the filter;
injecting water into the packer for pressurization to realize setting of the packer;
injecting a chemical well-flushing agent into the mineral deposit through the packer, and then carrying out a mud-skin dissolution reaction on the chemical well-flushing agent and the mineral deposit;
and after the mud skin is dissolved and reacted, unsealing the packer, lifting the packer to the ground surface, then pumping water to the uranium deposit production well, and completing well flushing when the pH value of the obtained pumped well flushing water is 6.5-7.5.
2. The method of claim 1, wherein the bottom of the packer is 2.0-3.0 m from the upper surface of the filter.
3. A method according to claim 1, wherein the pressurisation is to a pressure of 4.0 to 5.0 MPa.
4. The method of claim 1, wherein the chemical well-flushing agent comprises the following components in parts by mass: 0.5 to 2.0 percent of sulfamic acid, 1.5 to 4 percent of hydrochloric acid and the balance of water.
5. The method of claim 1 or 4, wherein the chemical well-flushing agent comprises the following components in parts by mass: 0.8 to 1.5 percent of sulfamic acid, 2 to 3.2 percent of hydrochloric acid and the balance of water.
6. A method of well flushing according to claim 1 or 4, characterized in that the amount of chemical flushing agent injected per meter of filter length is 3.2-4.8 m3。
7. The well washing method according to claim 1, wherein the time of the mud skin dissolution reaction is 16-48 h.
8. A method of well flushing according to claim 1 wherein the pH is from 6.8 to 7.2.
9. The method of claim 1, wherein the running packer uses a 316L stainless steel pipe.
10. A method of washing a well according to claim 1, wherein a chemical well-wash is injected into the seam through a 316L stainless steel pipe.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112483026A (en) * | 2020-11-06 | 2021-03-12 | 核工业北京化工冶金研究院 | Mechanical and chemical combined well flushing method for ground-leaching U-shaped horizontal well |
| CN112647902A (en) * | 2020-12-25 | 2021-04-13 | 核工业北京化工冶金研究院 | In-situ leaching uranium mining drilling filter and well completion method |
| CN114622866A (en) * | 2020-12-14 | 2022-06-14 | 中核内蒙古矿业有限公司 | NaOH well washing process for in-situ leaching mine |
| CN117188999A (en) * | 2023-11-07 | 2023-12-08 | 核工业北京化工冶金研究院 | Efficient well flushing method for U-shaped well for in-situ leaching uranium mining |
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