CN112540035B - Ultrasonic infiltration enhancement experimental method for low-permeability sandstone uranium ores - Google Patents
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- 229910052770 Uranium Inorganic materials 0.000 title claims abstract description 33
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 238000002474 experimental method Methods 0.000 title claims abstract description 14
- 238000001764 infiltration Methods 0.000 title claims abstract description 12
- 230000008595 infiltration Effects 0.000 title claims abstract description 12
- 238000002347 injection Methods 0.000 claims abstract description 45
- 239000007924 injection Substances 0.000 claims abstract description 45
- 230000035699 permeability Effects 0.000 claims abstract description 42
- 239000011435 rock Substances 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 230000008859 change Effects 0.000 claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000001965 increasing effect Effects 0.000 claims abstract description 9
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 7
- 239000000243 solution Substances 0.000 claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000009210 therapy by ultrasound Methods 0.000 claims description 3
- 238000005065 mining Methods 0.000 abstract description 11
- 238000002386 leaching Methods 0.000 abstract description 9
- 238000011065 in-situ storage Methods 0.000 abstract description 8
- 230000009471 action Effects 0.000 abstract description 6
- 238000009738 saturating Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 9
- 239000012530 fluid Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Fluid Mechanics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
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Abstract
The invention discloses an ultrasonic infiltration increasing experimental method for a low-permeability sandstone uranium deposit, which comprises the following steps of core saturation: vacuumizing and saturating the short rock core before liquid displacement; after the core is saturated, putting the core into an ultrasonic core holder, starting a liquid injection system, starting liquid injection and starting to test the permeability change of the liquid injection system; after the permeability of the rock core is stable, turning on a special ultrasonic power supply, performing ultrasonic permeability increasing action, observing the change condition of the permeability, and testing the final permeability of the rock core; keeping the ultrasonic frequency unchanged; keeping the solution continuously seeping in the testing process; replacing the ultrasonic transducers with the 15kHz transducers of 20 kHz, 25 kHz and 30kHz, and replacing the artificial small core at the same time to investigate the permeability change condition of the core with the same property under different ultrasonic conditions; and repeating the second step to the fourth step. The method inspects and measures the change condition of the core permeability under the action of ultrasonic waves with different frequencies and powers, and provides reference for in-situ leaching uranium mining of the low-permeability sandstone uranium mine.
Description
Technical Field
The invention relates to the field of ultrasonic permeability-increasing experiments, in particular to an ultrasonic permeability-increasing experimental method for a low-permeability sandstone uranium ore.
Background
The in-situ leaching uranium mining method is an integrated uranium mining method which selectively dissolves uranium in ores through chemical reaction of a leaching agent and minerals under the condition of natural burial without causing displacement of the ores. The in-situ leaching uranium mining is the only mining mode of sandstone-type uranium resources, and the proportion of the natural uranium produced by the in-situ leaching uranium mining mode is over 50 percent internationally and over 90 percent in China. In actual production, endowing the ore rock stratum with certain permeability is a basic requirement and a key control factor for in-situ leaching exploitation. However, compared with the countries such as the United states, utzibesstein, hassakestan and the like, the permeability of the sandstone-type uranium resource assigned rock stratum in China is generally low, low-permeability resources account for more than 70% of sandstone uranium resources (low permeability: permeability coefficient is less than 0.1 m/D or less than 0.1D), and the low permeability of the assigned rock stratum causes a plurality of outstanding contradictions such as 'difficult injection, difficult mining, low recovery rate and high cost' of ground mining, and the like, thereby seriously hindering the development and utilization of the resources. Therefore, how to effectively improve the permeability of the low-permeability sandstone uranium ore mineralization rock layer becomes a key difficult problem in the current exploitation of the resources, and a solution is urgently needed.
The ultrasonic wave is a sound wave with the frequency higher than 20 kHz, and has good directivity, strong penetrating power, concentrated sound energy and long propagation distance in water. When the sound intensity reaches a certain intensity, certain influence or effect will be generated on the medium, such as the change of the state, the composition, the function or the structure of the medium, and the change is called as the ultrasonic effect. The ultrasonic wave permeation-increasing technology is a physical permeation-increasing method with less pollution, low cost and good benefit, and is firstly applied to the United states and the Soviet Union oil industry in the last 50 th century. In addition, when ultrasonic waves act on the pore fluid medium, the thermal effect reduces the viscosity of the fluid, the pressure gradient in the fluid is reduced, and the permeability of the core is obviously improved. When the ultrasonic wave is used for eliminating inorganic scaling blockage of the rock core, the recovery of the permeability of the rock core is better, and the pressure reduction and injection increase effects of the water injection well are obvious.
At present, however, application research of an ultrasonic wave permeation enhancing technology is not developed in the field of in-situ leaching uranium mining, and research on the effect of improving the permeability of low-permeability sandstone uranium ore by ultrasonic waves with different frequencies and powers is lacked. Therefore, in order to simulate and evaluate the effect of ultrasonic waves on improving the permeability of low-permeability sandstone uranium ores, an ultrasonic wave permeability-increasing test method for the low-permeability sandstone uranium ores needs to be developed.
Disclosure of Invention
The invention aims to provide an ultrasonic infiltration experimental method for a low-permeability sandstone uranium ore, which is used for solving the problems in the prior art, investigating and measuring the change condition of core permeability under the action of ultrasonic waves with different frequencies and powers, evaluating the ultrasonic infiltration effect according to the change of the core permeability, providing an experimental method and basis for ultrasonic infiltration of the low-permeability sandstone uranium ore, and further providing reference for in-situ leaching uranium mining of the low-permeability sandstone uranium ore.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides an ultrasonic permeability-increasing experimental method for low-permeability sandstone uranium ores, which comprises the following steps:
step one, core saturation: before liquid displacement is carried out on the short core, evacuation saturation is required, the core is placed in deionized water by using a vacuum-pumping saturator under the pressure of a vacuum pump of-0.1 MPa, the core is pumped until no bubbles appear, the pump is turned off after the core is stabilized for 4 hours, and the core is saturated in vacuum for 24 hours for standby;
secondly, after the core is saturated, putting the core into an ultrasonic core holder, starting a liquid injection system, starting liquid injection and starting to test the permeability change of the liquid injection system;
step three, after the permeability of the rock core is stable, starting an ultrasonic special power supply, starting a 15kHz ultrasonic transducer, setting the ultrasonic power to be 100W, performing ultrasonic permeability increasing action, intermittently operating for 5 minutes every 10 minutes, stopping the ultrasonic after the accumulated ultrasonic treatment time reaches 60 minutes, observing the change condition of the permeability, and testing the final permeability of the rock core;
step four, keeping the ultrasonic frequency inconvenient, increasing the ultrasonic power to 200, 500, 1000 and 1500W, starting the ultrasonic for 60 minutes under each power, and intermittently performing 5 minutes under the operating condition of 10 minutes each time; keeping the solution continuously seeping in the testing process;
replacing the ultrasonic transducers with the 15kHz transducers of 20 kHz, 25 kHz and 30kHz, and replacing the artificial small core at the same time to investigate the permeability change condition of the core with the same property under different ultrasonic conditions; and repeating the second step to the fourth step.
Optionally, in the second step, the ultrasonic rock core holder is connected with a liquid injection system; an ultrasonic transducer is installed at one end of the ultrasonic rock core holder, the liquid injection system is communicated with one end, close to the ultrasonic transducer, of the ultrasonic rock core holder through a first pipeline, one end, far away from the ultrasonic transducer, of the ultrasonic rock core holder is communicated with a metering system through a second pipeline, and a ring pressure pump is communicated with the side wall of the ultrasonic rock core holder through a third pipeline; the first pipeline, the second pipeline and the third pipeline are respectively provided with a pressure sensor, the pressure sensors are connected with a data acquisition and processing system, the liquid injection system is connected with an automatic control system, and the ultrasonic transducers are connected with a special ultrasonic power supply; the liquid injection system comprises a constant-speed constant-pressure injection pump, the constant-speed constant-pressure injection pump is connected with a plurality of intermediate containers in parallel, and the tail ends of the intermediate containers are respectively communicated with the ultrasonic rock core holder through first pipelines; a branch is connected between the constant-speed constant-pressure injection pump and the first pipeline, and a control valve is installed on the branch.
Optionally, the ultrasonic core holder has a ring pressure of 0-32MPa, an injection pressure of 0-25MPa, an injection speed of 0.01-40mL/min, and a pressure test accuracy of 0.1%.
Compared with the prior art, the invention achieves the following technical effects:
the invention can simulate the real-time change conditions of inlet-outlet pressure difference, flow of liquid flowing through the core and core liquid permeability under the ultrasonic orientation action of four frequency ranges of 15kHz, 20 kHz, 25 kHz and 30kHz and 0-1.5kW of power under the condition of 0-32MPa of the laminating pressure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic layout diagram of experimental devices required by the ultrasonic infiltration enhancement experimental method for low-permeability sandstone uranium ores;
wherein, 1 is an ultrasonic core holder, 2 is an ultrasonic transducer, 3 is a first pipeline, 4 is a second pipeline, 5 is a third pipeline, 6 is a ring pressure pump, 7 is a pressure sensor, 8 is a constant-speed constant-pressure injection pump, 9 is an intermediate container, 10 is a branch, 11 is a control valve, 12 is a flow metering instrument, and 13 is an ultrasonic special power supply.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The invention aims to provide an ultrasonic permeability-increasing experimental method for low-permeability sandstone uranium ores, which is used for solving the problems in the prior art and investigating and measuring the change condition of the core permeability under the action of ultrasonic waves with different frequencies and powers.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides an ultrasonic infiltration experimental method for a low-permeability sandstone uranium ore, which is characterized in that aiming at the low-permeability sandstone uranium ore, by using an indoor ultrasonic infiltration simulation experimental device, fluid is injected into a rock core under the conditions of certain ultrasonic frequency (15, 20, 25 and 30 kHz) and ultrasonic power (0-1.5 KW) and certain confining pressure and flow rate, the change condition of the rock core permeability under the ultrasonic action of different frequencies and powers is investigated and determined, the ultrasonic infiltration effect is evaluated according to the change of the rock core permeability, an experimental method and a basis are provided for the ultrasonic infiltration of the low-permeability sandstone uranium ore, and further reference is provided for in-situ leaching uranium mining of the low-permeability sandstone uranium ore. Specifically, the method comprises the following steps:
step one, core saturation: before liquid displacement is carried out on the short core, evacuation saturation is required, the core is placed in deionized water by using a vacuum-pumping saturator under the pressure of a vacuum pump of-0.1 MPa, the core is pumped until no bubbles appear, the pump is turned off after the core is stabilized for 4 hours, and the core is saturated in vacuum for 24 hours for standby;
secondly, after the core is saturated, putting the core into an ultrasonic core holder, starting a liquid injection system, starting liquid injection and starting to test the permeability change of the liquid injection system;
step three, after the permeability of the rock core is stable, starting an ultrasonic special power supply, starting a 15kHz ultrasonic transducer, setting the ultrasonic power to be 100W, performing ultrasonic permeability increasing action, intermittently operating for 5 minutes every 10 minutes, stopping the ultrasonic after the accumulated ultrasonic treatment time reaches 60 minutes, observing the change condition of the permeability, and testing the final permeability of the rock core;
step four, keeping the ultrasonic frequency inconvenient, increasing the ultrasonic power to 200, 500, 1000 and 1500W, starting the ultrasonic for 60 minutes under each power, and intermittently operating for 5 minutes every 10 minutes under the operating condition; keeping the solution continuously seeping in the testing process;
replacing the ultrasonic transducers with the 15kHz transducers of 20 kHz, 25 kHz and 30kHz, and replacing the artificial small core at the same time to investigate the permeability change condition of the core with the same property under different ultrasonic conditions; and repeating the second step to the fourth step.
As shown in fig. 1, in the second step, the ultrasonic core holder 1 is connected with a liquid injection system; the device required by the experimental method also comprises a metering system, an automatic control system and a data acquisition and processing system; one end of the ultrasonic core holder 1 is provided with an ultrasonic transducer 2, the size of the ultrasonic core holder 1 is phi 25 multiplied (25-80) mm, and the ultrasonic core holder can resist the pressure of 25MPa; stainless steel material; the liquid injection system is communicated with one end, close to the ultrasonic transducer 2, of the ultrasonic core holder 1 through a first pipeline 3, one end, far away from the ultrasonic transducer 2, of the ultrasonic core holder 1 is communicated with a metering system through a second pipeline 4, and the side wall of the ultrasonic core holder 1 is communicated with a ring pressure pump 6 through a third pipeline 5; the first pipeline 3, the second pipeline 4 and the third pipeline 5 are respectively provided with a pressure sensor 7, the pressure sensors 7 are connected with a data acquisition and processing system, the liquid injection system is connected with an automatic control system, and the automatic control system automatically controls the flow of an injection pump, the balance peels and the like through a computer; the ultrasonic transducer is connected with an ultrasonic special power supply 13.
Preferably, the liquid injection system comprises a constant-speed constant-pressure injection pump 8, the constant-speed constant-pressure injection pump 8 is connected with a plurality of intermediate containers 9 in parallel, the intermediate containers 9 are of piston structures, and the tail ends of the intermediate containers 9 are respectively communicated with the ultrasonic rock core holder 1 through a first pipeline 3; various fluids can be injected into the ultrasonic rock core holder 1 according to certain flow and pressure, and the injection speed is 0.01-40mL/min; a branch 10 is connected between the constant-speed constant-pressure injection pump 8 and the first pipeline 3, and a control valve 11 is installed on the branch 10. A control valve 11 is mounted on the third line 5. The metering system comprises a flow metering instrument 12 and a pressure sensor 7, one end, far away from the ultrasonic transducer 2, of the ultrasonic core holder 1 is communicated with a liquid collecting container on the flow metering instrument 12 through a second pipeline 4, the flow metering instrument 12 comprises a balance for metering and the like, and the liquid collecting container comprises a measuring cup and the like arranged on the balance. The ultrasonic transducer 2 is connected with an ultrasonic special power supply 13; the data acquisition and processing system comprises various data acquisition cards, an industrial personal computer and acquisition and processing software, can acquire parameters such as pressure, flow and the like at proper time, and carry out operation processing on the data to obtain the real-time change condition of the permeability coefficient of the rock core under the action of ultrasonic waves. The ring pressure of the ultrasonic rock core holder 1 is 0-32MPa, the injection pressure is 0-25MPa, the injection speed is 0.01-40mL/min, and the pressure test precision is 0.1% FS.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (1)
1. An ultrasonic infiltration increasing experimental method for low-permeability sandstone uranium ores is characterized by comprising the following steps: the method comprises the following steps:
step one, core saturation: before liquid displacement is carried out on the short core, evacuation saturation is required, the core is placed in deionized water by using a vacuum-pumping saturator under the pressure of a vacuum pump of-0.1 MPa, the core is pumped until no bubbles appear, the pump is turned off after the core is stabilized for 4 hours, and the core is saturated in vacuum for 24 hours for standby;
secondly, after the core is saturated, putting the core into an ultrasonic core holder, starting a liquid injection system, starting liquid injection and starting to test the permeability change of the liquid injection system; the ultrasonic rock core holder is connected with a liquid injection system; an ultrasonic transducer is installed at one end of the ultrasonic rock core holder, the liquid injection system is communicated with one end, close to the ultrasonic transducer, of the ultrasonic rock core holder through a first pipeline, one end, far away from the ultrasonic transducer, of the ultrasonic rock core holder is communicated with a metering system through a second pipeline, and a ring pressure pump is communicated with the side wall of the ultrasonic rock core holder through a third pipeline; the first pipeline, the second pipeline and the third pipeline are respectively provided with a pressure sensor, the pressure sensors are connected with a data acquisition and processing system, the liquid injection system is connected with an automatic control system, and the ultrasonic transducer is connected with a special ultrasonic power supply; the liquid injection system comprises a constant-speed constant-pressure injection pump, the constant-speed constant-pressure injection pump is connected with a plurality of intermediate containers in parallel, and the tail ends of the intermediate containers are respectively communicated with the ultrasonic rock core holder through first pipelines; a branch is connected between the constant-speed constant-pressure injection pump and the first pipeline, and a control valve is mounted on the branch; the intermediate container is of a piston structure; a control valve is arranged on the third pipeline; the metering system comprises a flow meter and a pressure sensor, and one end of the ultrasonic core holder, which is far away from the ultrasonic transducer, is communicated with a liquid collecting container on the flow meter through a second pipeline;
step three, after the permeability of the rock core is stable, starting an ultrasonic special power supply, starting a 15kHz ultrasonic transducer, setting the ultrasonic power to be 100W, performing ultrasonic permeability increasing action, intermittently operating for 5 minutes every 10 minutes, stopping the ultrasonic after the accumulated ultrasonic treatment time reaches 60 minutes, observing the change condition of the permeability, and testing the final permeability of the rock core;
keeping the ultrasonic frequency unchanged, increasing the ultrasonic power to 200W, 500W, 1000W and 1500W, starting the ultrasonic for 60 minutes under each power, and intermittently operating for 5 minutes every 10 minutes under the operating condition; keeping the solution continuously seeping in the testing process;
replacing the 15kHz ultrasonic transducers of 20 kHz, 25 kHz and 30kHz, and replacing the small core at the same time to investigate the permeability change condition of the core with the same property under different ultrasonic conditions; repeating the second step to the fourth step;
the ring pressure of the ultrasonic rock core holder is 0-32MPa, the injection pressure is 0-25MPa, the injection speed is 0.01-40mL/min, and the pressure test precision is 0.1% FS.
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| WO2019036351A1 (en) * | 2017-08-14 | 2019-02-21 | Board Of Regents, The University Of Texas System | Liquid coupled ultrasonic transducer array for measurement of rock elastic properties |
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| CN102031955A (en) * | 2010-09-27 | 2011-04-27 | 中国石油大学(华东) | Ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility and experimental method |
| WO2019036351A1 (en) * | 2017-08-14 | 2019-02-21 | Board Of Regents, The University Of Texas System | Liquid coupled ultrasonic transducer array for measurement of rock elastic properties |
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