CN111520107B - Well flushing process for in-situ leaching uranium mining production well - Google Patents
Well flushing process for in-situ leaching uranium mining production well Download PDFInfo
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- CN111520107B CN111520107B CN202010332979.8A CN202010332979A CN111520107B CN 111520107 B CN111520107 B CN 111520107B CN 202010332979 A CN202010332979 A CN 202010332979A CN 111520107 B CN111520107 B CN 111520107B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000011010 flushing procedure Methods 0.000 title claims abstract description 25
- 229910052770 Uranium Inorganic materials 0.000 title claims abstract description 22
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000002386 leaching Methods 0.000 title claims abstract description 21
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 18
- 238000005065 mining Methods 0.000 title claims abstract description 14
- 238000005406 washing Methods 0.000 claims abstract description 43
- 239000002253 acid Substances 0.000 claims abstract description 29
- 238000005086 pumping Methods 0.000 claims abstract description 20
- 239000004576 sand Substances 0.000 claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000011049 filling Methods 0.000 claims abstract description 6
- 239000000523 sample Substances 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 9
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 4
- KVBCYCWRDBDGBG-UHFFFAOYSA-N azane;dihydrofluoride Chemical compound [NH4+].F.[F-] KVBCYCWRDBDGBG-UHFFFAOYSA-N 0.000 claims description 4
- 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 4
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical class [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 claims description 4
- 239000007788 liquid Substances 0.000 abstract description 22
- 238000002347 injection Methods 0.000 abstract description 19
- 239000007924 injection Substances 0.000 abstract description 19
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical class [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229960004887 ferric hydroxide Drugs 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 1
- 229910021506 iron(II) hydroxide Inorganic materials 0.000 description 1
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000002791 soaking Methods 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Chemical & Material Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to the technical field of in-situ leaching uranium mining, and particularly discloses a well flushing process for an in-situ leaching uranium mining production well, which comprises the following steps: the method comprises the following steps: measuring the sand setting height of the production well by using a logging probe; step two: a well washing pipe is put into the well; step three: preparing a mixed acid well-flushing agent, and pumping the mixed acid well-flushing agent into a production well through a pressurizing pump; step four: sealing the production well, and filling compressed air into the well; step five: releasing the pressure in the well, starting the air compressor to wash the well until the pH value of the well washing water is not less than 5.5, and finishing the well washing. After the well is washed by the process, the pumping and injection liquid amount of the production well is increased remarkably, the average lift is more than 18%, the pumping and injection liquid amount after well washing is maintained for a long time, and the process has good economic benefit and environmental benefit.
Description
Technical Field
The invention belongs to the technical field of in-situ leaching uranium mining, and particularly relates to a well flushing process for an in-situ leaching uranium mining production well.
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. At present, industrialized mining production is realized in Sinkiang, inner Mongolia and other places in China. In the in-situ leaching uranium mining, drilling is the only underground engineering for disclosing an ore bed, and pumping and injecting liquid are realized through a filter.
Production wells are often plugged to varying degrees during operation. The causes of well plugging are many, mainly chemical plugging, mechanical plugging, gas plugging, and plugging related to ion exchange.
Chemical plugging is most common during acid leaching, and is mainly caused by precipitation of iron and aluminum hydroxides, controlled by the pH of the solution. For example, when the pH of the solution is 4.0-5.0, aluminum hydroxide is precipitated; when the pH value is 2.5-3.5, the ferric hydroxide starts to dissolve; when the pH value is 8.0-9.0, the ferrous hydroxide begins to precipitate.
During neutral leaching, Ca (Mg) CO is most common 3 And (4) precipitating. Ca (Mg) CO 3 The dissolution precipitation of (2) is influenced by Ca in water 2+ 、Mg 2+ Ion concentration, bicarbonate ion concentration, and pH. Because the pH value of the underground leaching environment changes, single or mixed insoluble substances can be formed, the well gaps are blocked in the ore bed, and the permeability of the ore bed is reduced.
After chemical precipitation, chemical well washing is usually performed on the in-situ leaching mine by using hydrochloric acid or nitric acid and the like. The common method comprises the steps of directly pouring 1-2 barrels of industrial hydrochloric acid or nitric acid into a production well from a wellhead, soaking for 1-2 days, and then washing out residual acid by using an air compressor. The main disadvantages of this method are: industrial high concentrations of hydrochloric or nitric acid are prone to formation damage and often result in unnecessary consumption of acid.
Disclosure of Invention
The invention aims to provide a well flushing process for an in-situ leaching uranium production well, which is used for dissolving chemical precipitates and improving the liquid pumping amount and the liquid injection amount of the production well.
The technical scheme of the invention is as follows:
a well flushing process for an in-situ leaching uranium production well comprises the following steps:
the method comprises the following steps: measuring the sand setting height of the production well by using a logging probe;
step two: a well washing pipe is put into the well;
step three: preparing a mixed acid well-flushing agent, and pumping the mixed acid well-flushing agent into a production well through a pressurizing pump;
step four: sealing the production well by using a wellhead device, and filling compressed air into the well until a pressure gauge on the wellhead device is 1.5-3.0 MPa, and keeping the pressure for 2-16 h;
step five: and opening the wellhead device to release pressure, starting to wash the well by using the air compressor until the pH value of the well washing water is not less than 5.5, and completing well washing.
In the first step, if the sand setting height of the production well is measured to be larger than or equal to 1.0m, pretreating the production well by using an air compressor to reduce the sand setting height of the production well to be less than 1.0m, and then performing the second step; and if the measured sand setting height of the production well is less than 1.0m, directly performing the step two.
In the third step, the formula of the mixed acid is as follows: 2-5% of dihydrazine hydrochloride by mass; 0.5-1% of triethanolamine by mass; 1-3% of EDTA sodium salt by mass.
In the third step, the formula of the mixed acid is as follows: 3-5% of sulfamic acid by mass; 0.2-0.5% of citric acid by mass; 0.2-0.4% of acid ammonium fluoride by mass.
In step three, the amount of the mixed acid is in direct proportion to the length of the filter.
In the third step, 0.6-1.0 m of mixed acid is added into each meter of filter 3 。
In the second step, the distance between the bottom end of the well washing pipe and the lower end of the production well filter is 1.5-2.5 m.
In the second step, the pressure resistance of the well washing pipe is not less than 4.0 MPa.
In the second step, the specification of the well washing pipe is
The invention has the following remarkable effects:
after the process disclosed by the invention is adopted for well washing, the pumping and injection liquid amount of a production well is increased remarkably, the average promotion is more than 18%, the pumping and injection liquid amount after well washing is maintained for a long time, and the process has good economic benefits and environmental benefits and is applied to the test and production of a certain uranium deposit.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
A well flushing process for an in-situ leaching uranium production well comprises the following steps:
the method comprises the following steps: measuring the sand setting height of the production well by using a logging probe;
if the measured sand setting height of the production well is not less than 1.0m, pretreating the production well by using an air compressor, reducing the sand setting height of the production well to be less than 1.0m, and starting the next working procedure;
if the measured sand setting height of the production well is less than 1.0m, directly starting the next working procedure;
step two: a well washing pipe is put into the well, and the specification of the well washing pipe is
The pressure resistance is not less than 4.0MPa, and the distance from the bottom end of the well washing pipe to the lower end of the filter of the production well is 1.5-2.5 m;
step three: preparing a mixed acid well-flushing agent, pumping the mixed acid well-flushing agent into a production well through a pressure pump, wherein the addition amount of the mixed acid is in direct proportion to the length of a filter, and the mixed acid is added into the filter by 0.6-1.0 m per meter 3 ；
The formula I of the mixed acid is as follows: 2-5% of dihydrazine hydrochloride by mass; 0.5-1% of triethanolamine by mass; 1-3% of EDTA sodium salt by mass;
the formula II of the mixed acid is as follows: 3-5% of sulfamic acid by mass; 0.2-0.5% of citric acid by mass; 0.2-0.4% of acid ammonium fluoride by mass;
step four: sealing the production well by using a wellhead device, and filling compressed air into the well until a pressure gauge on the wellhead device is 1.5-3.0 MPa, and keeping the pressure for 2-16 h;
step five: and opening the wellhead device to release pressure, starting the air compressor to wash the well until the pH value of the well washing water is not less than 5.5, and finishing well washing.
Example 1
The thickness of an ore-bearing aquifer of a certain uranium deposit is 4.9-11.8 m, the average thickness is 8.6m, and the unit water burst permeability coefficient is 0.14-0.52 m/d. The SC-01 liquid pumping well adopts a gravel-packed structure, the well depth is 297.5m, the specification of a casing pipe is phi 148 multiplied by 10mm, the length of a filter is 8.2m, the position of the filter is 286.3-294.5m, and the length of a sand setting pipe is 3.0 m. After 2 years of operation, the liquid pumping volume is reduced by 42 percent, obvious blockage phenomenon is generated, and the liquid pumping volume is 2.2m 3 H is used as the reference value. The method for washing the well comprises the following steps:
the method comprises the following steps: measuring the sand setting height of an SC-01 liquid extraction well by using a logging probe, wherein the sand setting height of the liquid extraction well is 1.5m, washing the well by using an air compressor, measuring the sand setting height after washing the well again to be 0.2m, and starting the next working procedure;
step two: a well washing pipe is put into the SC-01 liquid pumping well, and the specification of the well washing pipe is as follows
The pressure resistance is not less than 4.0MPa, the bottom position of the well washing pipe is 296.2m, and the distance from the bottom end of the production well filter is 1.7 m;
step three: preparing a mixed acid well-flushing agent, wherein the formula of the mixed acid well-flushing agent comprises 3% of dihydrazine hydrochloride, 0.6% of triethanolamine, 1.2% of EDTA sodium salt and the balance of water. Pumping into SC-01 liquid-pumping well by pressurizing pump, wherein the adding amount of the mixed acid is 0.75m 3 Per meter of filter, total addition of 6.15m 3 ；
Step four: sealing the SC-01 liquid pumping well by using a well head device, filling compressed air into the well until a pressure gauge on the well head device is 1.8MPa, and keeping the pressure for 6 h;
step five: and opening the wellhead device of the SC-01 liquid extraction well to release pressure, starting to wash the well by using an air compressor when a pressure gauge on the wellhead device is 0.0MPa, and completing the well washing until the pH value of the well washing water reaches 6.2.
After the well washing is finished, the liquid pumping amount of the SC-01 liquid pumping well is 2.85m 3 H, after 7 days of operation, the liquid suction amount is stabilized at 2.63m 3 And/h, 19.6 percent higher than that before well washing.
Example 2
The thickness of a uranium deposit ore bed is 3.7-9.2 m, the average thickness is 5.8m, and the permeability coefficient is 0.34-0.63 m/d. The SYZ-06 liquid injection well adopts a gravel-packed structure, the well depth is 220.6m, the specification of a casing pipe is phi 100 multiplied by 10mm, the length of a filter is 6.3m, the position of the filter is 210.3-216.6m, and the length of a sand setting pipe is 4.0 m. After the operation, obvious blocking phenomenon is generated, and the liquid injection amount is 1.6m 3 H is used as the reference value. The method for washing the well comprises the following steps:
the method comprises the following steps: measuring the sand setting height of the SYZ-06 injection well by using a logging probe, wherein the sand setting height of the SYZ-06 injection well is 0.6m, and directly starting the next working procedure;
step two: a well washing pipe is put into the SYZ-06 injection well, and the specification of the well washing pipe is as follows
The pressure resistance is not less than 4.0MPa, the bottom position of the well washing pipe is 223.2m, and the distance between the bottom position and the bottom end of the SYZ-06 liquid injection well filter is 1.6 m;
step three: preparing a mixed acid well-flushing agent, wherein the formula of the mixed acid well-flushing agent comprises 2.4% of sulfamic acid, 0.5% of citric acid, 0.4% of acid ammonium fluoride and the balance of water. Pumping into SYZ-06 injection well by pressurizing pump, wherein the adding amount of mixed acid is 0.80m 3 Per meter of filter, the total addition is 5.12m 3 ；
Step four: sealing the SYZ-06 liquid injection well by using a well head device, filling compressed air into the well until a pressure gauge on the well head device is 1.3MPa, and keeping the pressure for 10 hours;
step five: and opening a wellhead device of the SYZ-06 injection well to release pressure, starting the air compressor to wash the well when a pressure gauge on the wellhead device is 0.0MPa, and completing the well washing until the pH value of the well washing water reaches 6.5.
After the well washing is finished, the injection amount of the SYZ-06 injection well is 2.36m 3 H, after 7 days of operation, the injection quantity is stabilized at 2.17m 3 And/h, the injection amount is improved by 35.6 percent compared with the injection amount before well flushing.
Claims (6)
1. A well washing process for an in-situ leaching uranium production well is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: measuring the sand setting height of the production well by using a logging probe;
step two: a well washing pipe is put into the well;
step three: preparing a mixed acid well-flushing agent, and pumping the mixed acid well-flushing agent into a production well through a pressurizing pump;
step four: sealing the production well by using a wellhead device, and filling compressed air into the production well until a pressure gauge on the wellhead device is 1.5-3.0 MPa, and keeping the pressure for 2-16 h;
step five: opening a wellhead device to release pressure, starting the air compressor to wash the well until the pH value of the well washing water is not less than 5.5, and finishing well washing;
in the first step, if the sand setting height of the production well is measured to be larger than or equal to 1.0m, pretreating the production well by using an air compressor, reducing the sand setting height of the production well to be less than 1.0m, and then performing the second step; if the measured sand setting height of the production well is less than 1.0m, directly performing the second step;
in the third step, the first formula of the mixed acid is as follows: 2-5% of dihydrazine hydrochloride by mass; 0.5-1% of triethanolamine by mass; 1-3% of EDTA sodium salt by mass;
or the formula II of the mixed acid is as follows: 3-5% of sulfamic acid in percentage by mass; 0.2-0.5% of citric acid by mass; 0.2-0.4% of acid ammonium fluoride by mass.
2. The in-situ leaching uranium mining production well flushing process according to claim 1, wherein: in step three, the amount of the mixed acid is in direct proportion to the length of the filter.
3. The well flushing process for the in-situ leaching uranium production well according to claim 2, wherein: in the third step, 0.6-1.0 m of mixed acid is added into each meter of filter 3 。
4. The in-situ leaching uranium mining production well flushing process according to claim 3, wherein: in the second step, the distance between the bottom end of the well washing pipe and the lower end of the production well filter is 1.5-2.5 m.
5. The well flushing process for the in-situ leaching uranium production well according to claim 4, wherein: in the second step, the pressure resistance of the well washing pipe is not less than 4.0 MPa.
6. The in-situ leaching uranium mining production well flushing process according to claim 5, wherein: in the second step, the specification of the well washing pipe is
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| CN112943126B (en) * | 2021-03-17 | 2022-06-07 | 南华大学 | Auxiliary discharge device for washing waste liquid of in-situ leaching uranium mine based on liquid level pressurization |
| CN114737900B (en) * | 2021-12-27 | 2024-09-10 | 核工业北京化工冶金研究院 | Static rotational flow well washing device and method for cleaning in-situ immersed drilling holes |
| CN117188999B (en) * | 2023-11-07 | 2024-02-09 | 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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| US7491682B2 (en) * | 2004-12-15 | 2009-02-17 | Bj Services Company | Method of inhibiting or controlling formation of inorganic scales |
| CN106507863B (en) * | 2009-11-27 | 2013-05-29 | 核工业北京化工冶金研究院 | In in-situ leaching uranium, augmented injection method is taken out in the increasing of wellhole |
| CN102720467B (en) * | 2012-05-18 | 2014-06-18 | 核工业北京化工冶金研究院 | Residual acid flowback method after acid method hole-flushing in-situ leach of uranium |
| CN104533346A (en) * | 2014-12-22 | 2015-04-22 | 核工业北京化工冶金研究院 | Method for preparing hole flushing agent through citric acid in in-situ leaching uranium mining process |
| CN109989727A (en) * | 2017-12-29 | 2019-07-09 | 新疆中核天山铀业有限公司 | A kind of ground-dipping uranium extraction drilling de-plugging anatonosis technique |
| CN109913670B (en) * | 2019-03-05 | 2021-11-23 | 核工业北京化工冶金研究院 | Method for preventing chemical blockage of ore bed by acid in-situ leaching uranium mining |
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