CN112540036B - Ultrasonic wave and surfactant coupling permeation increasing experimental method - Google Patents
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- 239000004094 surface-active agent Substances 0.000 title claims abstract description 40
- 238000002474 experimental method Methods 0.000 title claims abstract description 17
- 230000008878 coupling Effects 0.000 title claims abstract description 14
- 238000010168 coupling process Methods 0.000 title claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 63
- 239000011435 rock Substances 0.000 claims abstract description 54
- 230000035699 permeability Effects 0.000 claims abstract description 30
- 239000008398 formation water Substances 0.000 claims abstract description 22
- 229910052770 Uranium Inorganic materials 0.000 claims abstract description 18
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 8
- 239000012153 distilled water Substances 0.000 claims abstract description 8
- 230000006872 improvement Effects 0.000 claims abstract description 4
- 238000012544 monitoring process Methods 0.000 claims description 20
- 230000009471 action Effects 0.000 claims description 10
- 230000005012 migration Effects 0.000 claims description 4
- 238000013508 migration Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
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- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001808 coupling effect Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 230000020477 pH reduction Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- CSNNHWWHGAXBCP-UHFFFAOYSA-L magnesium sulphate Substances [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009736 wetting 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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- 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
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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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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- 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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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses an experimental method for permeation enhancement by coupling ultrasonic waves and a surfactant, which comprises the following steps: placing a low-permeability sandstone uranium ore core in the middle of the ultrasonic core holder; filling distilled water in a constant-pressure constant-flow pump; filling the intermediate container A with formation water; filling the intermediate container B with the prepared surfactant solution; injecting distilled water into an annular space of the ultrasonic core holder; injecting the formation water in the middle container A into a liquid inlet pipeline of the ultrasonic core holder; after the formation water flows out; the effluent flows into an automatic seepage calculation system, and the initial permeability of the core under the formation water condition is calculated; sending out ultrasonic waves; injecting the surfactant solution in the intermediate container B into the liquid inlet pipeline; and (4) enabling the effluent to flow into an automatic seepage calculation system, calculating the permeability of the rock core, and comparing the value with the initial permeability of the rock core, and calculating the improvement amplitude of the permeability of the rock core. The method improves the permeability of the low-permeability sandstone uranium ore and avoids formation damage.
Description
Technical Field
The invention relates to the technical field of seepage experiments, in particular to an ultrasonic and surfactant coupling permeation-increasing experimental method.
Background
Because the permeability of the ore is poor, the flow rate of underground fluid is slow, and the chemical reaction of the leaching agent and the uranium ore is slower, the liquid-solid mass transfer process usually needs a long time, even the uranium is difficult to leach due to the fact that the mass transfer cannot be effectively carried out, and the permeability of the low-permeability sandstone uranium ore needs to be improved. However, while improving the permeability of rock, formation damage is reduced.
At present, the method is also a technical problem for the ground-immersed mining of the low-permeability sandstone-type uranium deposit. In the process of leaching uranium from low-permeability sandstone uranium ores, different types of acid solutions are generally adopted for acidification and infiltration increase, such as HF, HCl and H2SO4However, the acidification and infiltration increase have certain disadvantages, HF has strong corrosivity, can corrode minerals such as quartz, feldspar and the like in the rock and damage the rock framework, and Cl in HCl-The ions can cause strong corrosion to the metal equipment, resulting in equipment damage, H2SO4The reaction with rock is easy to form CaSO4、MgSO4Etc., causing plugging of rock microporosities.
When the sound intensity reaches a certain intensity, the ultrasonic wave can generate certain influence or effect on a propagation medium in the sound wave propagation process, such as the state, the components, the functions or the structure of the medium are changed, and the ultrasonic wave can directly act on a solid framework of the rock in the physical processes of the mechanical vibration action, the cavitation action and the like so as to improve the permeability of the rock. However, ultrasonic waves loosen mineral particles to improve the permeability of the rock, and simultaneously erode and clean the attachments of the rock to form a large amount of micro particles which gradually precipitate in the process of moving away from the action range of the ultrasonic waves to block micropores to a certain degree.
The surfactant is a chemical substance capable of remarkably reducing the surface tension of the solution, changes the wettability of the solid surface and reverses the wettability of an ore-containing layer, so that the permeability of the solution is enhanced, and the permeability of the low-permeability sandstone uranium ore is improved. However, surfactants have the property of adsorbing on the rock surface, causing consumption of chemical agents.
Disclosure of Invention
The invention aims to provide an ultrasonic wave and surfactant coupling permeation-increasing experimental method, which is used for solving the problems in the prior art, improving the permeability of low-permeability sandstone uranium ores and avoiding formation damage.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides an experimental method for permeation enhancement by coupling ultrasonic waves and a surfactant, which comprises the following steps:
placing a low-permeability sandstone uranium ore core in the middle of an ultrasonic core holder;
filling distilled water into a constant-pressure constant-flow pump;
step three, filling formation water in the intermediate container A, wherein the formation water is matched with the formation where the core is located;
filling the intermediate container B with a prepared surfactant solution, wherein the solution is obtained by matching the surfactant with the formation water;
injecting distilled water into an annular space of the ultrasonic rock core holder through an annular pressure pipeline by a constant-pressure constant-flow pump, and monitoring annular pressure to enable the annular pressure to reach the pressure required by the experiment;
step six, setting parameters of a constant-pressure constant-flow pump, injecting the formation water in the middle container A into a liquid inlet pipeline of the ultrasonic rock core holder, and monitoring liquid inlet pressure;
step seven, after the formation water flows out of a liquid outlet pipeline of the ultrasonic rock core holder, setting a back pressure value and monitoring the back pressure;
step eight, enabling the effluent to flow into an automatic seepage calculation system, and calculating the initial permeability of the rock core under the formation water condition after the flow is stable;
setting frequency and power parameters of the ultrasonic transmitter, starting the ultrasonic transmitter, and transmitting the electric signal to the ultrasonic transducer;
step ten, the ultrasonic transducer works under the driving of an electric signal, sends out ultrasonic waves, and longitudinally transmits the ultrasonic waves along the rock core, wherein the ultrasonic waves are consistent with the water flow migration direction;
step eleven, injecting the surfactant solution in the intermediate container B into a liquid inlet pipeline of the ultrasonic rock core holder at the same flow rate, monitoring liquid inlet pressure, keeping the back pressure unchanged, and monitoring back pressure;
step twelve, enabling the effluent to flow into an automatic seepage calculation system, calculating the permeability of the rock core under the combined action of the ultrasonic waves and the surfactant after the flow is stable, and calculating the permeability improvement range of the rock core by comparing the value with the initial permeability of the rock core.
Optionally, in the first step, an ultrasonic transducer is arranged at one end of the ultrasonic rock core holder, the ultrasonic transducer is connected with an ultrasonic transmitter, one end of the ultrasonic rock core holder, which is close to the ultrasonic transducer, is connected with a liquid inlet pipeline, the other end of the ultrasonic rock core holder is connected with a liquid outlet pipeline, a ring pressure pipeline is connected to the side wall of the ultrasonic rock core holder, the liquid inlet pipeline, the liquid outlet pipeline and the ring pressure pipeline are all connected with branch circuits, one end of each branch circuit is connected with a constant-pressure constant-flow pump, and the other end of each branch circuit is connected with an automatic seepage calculation system; the branch is connected with an intermediate container A and an intermediate container B in parallel, and the intermediate container A and the intermediate container B are positioned between the constant-pressure constant-current pump and the liquid inlet pipeline; valves are arranged at two ends of the middle container A and the middle container B which are connected with the branch, on the liquid inlet pipeline, the annular pressure pipeline and the liquid outlet pipeline, the position of the branch between the annular pressure pipeline and the liquid outlet pipeline is provided with a valve, and the position of the branch connected with the middle container A and the middle container B in parallel is provided with a valve; the liquid inlet pipeline is provided with a liquid inlet pressure sensing system, the annular pressure pipeline is provided with an annular pressure automatic monitoring system, and the liquid outlet pipeline is provided with a back pressure sensing system.
Optionally, in the fifth step, valves at two ends of the intermediate container a and the intermediate container B need to be closed, valves at the positions of the liquid inlet pipeline and the liquid outlet pipeline and valves on the branch between the annular pressure pipeline and the liquid outlet pipeline are closed at the same time, and the other valves are opened.
Optionally, in the sixth step, valves at two ends of the intermediate container a need to be opened, and valves on a branch at a position parallel to the intermediate container a and valves at two ends of the intermediate container B and at the ring pressure pipeline need to be closed at the same time.
Optionally, in the eleventh step, it is necessary to open valves at two ends of the intermediate container B, and close valves on the branch parallel to the intermediate container B, two ends of the intermediate container a, and valves at the ring pressure pipeline.
Compared with the prior art, the invention has the following technical effects:
the method comprises the steps of placing a low-permeability sandstone uranium ore core in a coupling environment of a physical-chemical field of ultrasonic waves and a surfactant, and improving the permeability of the low-permeability sandstone uranium ore core under the combined action of the ultrasonic waves and the surfactant; the mechanical vibration effect of the ultrasonic wave can loosen mineral particles to form a new fluid channel; the surfactant has a wetting effect, can reduce the surface tension of the solution, change the wettability of rocks and reduce the flow resistance, so that the solution can enter a capillary channel more easily; under the coupling action of the two, the micro-channel formed by ultrasonic waves is beneficial to the entering of a surfactant solution and the acceleration of the expansion of the channel. High-speed micro jet flow formed by the cavitation action of ultrasonic waves impacts and erodes the surface of the rock, and formed fine particles are separated from the rock and enter the solution to become freely moving fine particles; the surfactant has the functions of adsorption and dispersion; under the coupling action of the two, the surfactant can wrap micro particles which enter the solution and are generated by ultrasonic waves, so that the micro particles are dispersed and suspended in the solution, and the precipitation effect of the particles is slowed down. The ultrasonic wave has the functions of cleaning the rock surface and preventing adhesion, so that the adsorption effect of the surfactant on the rock surface is greatly reduced under the action of the ultrasonic wave, and the reagent dosage of the surfactant is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and 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 to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of the arrangement of experimental equipment required by the experimental method for enhancing the permeability by coupling ultrasonic waves and a surfactant;
the system comprises a constant-pressure constant-flow pump 1, an intermediate container 2, an ultrasonic transmitter 3, an ultrasonic core holder 4, an ultrasonic transducer 5, a liquid inlet pipeline 6, a liquid inlet pressure sensing system 7, a ring pressure pipeline 8, an automatic ring pressure monitoring system 9, a liquid outlet pipeline 10, a back pressure sensing system 11, an automatic seepage calculating system 12 and a branch 13.
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 wave and surfactant coupling permeation-increasing experimental method, which is used for solving the problems in the prior art, improving the permeability of low-permeability sandstone uranium ores and avoiding formation damage.
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 wave and surfactant coupling infiltration increasing experimental method, wherein a low-permeability sandstone uranium ore core is placed in an ultrasonic wave core holder. The core diameter is 10mm, 25mm, 38mm, 70mm etc. ultrasonic wave core holder of different diameters can be changed according to experimental purpose and requirement to the core of different diameter specifications is adapted to. The ultrasonic transmitter sends an electric signal to drive the ultrasonic transducer to work, the ultrasonic transducer generates ultrasonic waves with certain frequency, and the ultrasonic waves are longitudinally transmitted along the rock core and are consistent with the water flow migration direction. And preparing a surfactant solution with a certain concentration, and introducing the surfactant solution into the rock core through the liquid inlet end of the ultrasonic rock core holder. And monitoring and calculating the permeability of the core by using a seepage test system, and obtaining the permeability change of the low-permeability sandstone uranium ore core under the combined action of ultrasonic waves and a surfactant. Referring to fig. 1, the experimental apparatus required by the present invention is combined, and the specific steps of the present invention are as follows:
firstly, placing a low-permeability sandstone uranium ore core in an ultrasonic core holder 4, and properly jacking the core to ensure that the core is positioned in the middle of the ultrasonic core holder 4;
filling distilled water into the constant-pressure constant-flow pump 1;
step three, filling formation water in the intermediate container A, wherein the formation water is matched with the formation where the core is located;
filling the intermediate container B with a prepared surfactant solution, wherein the solution is obtained by mixing a certain type and concentration of surfactant with formation water;
closing valves at two ends of the intermediate container A and the intermediate container B, closing valves at the liquid inlet pipeline and the liquid outlet pipeline and valves on a branch between the ring pressure pipeline and the liquid outlet pipeline, opening the rest valves, injecting distilled water into an annular space of the ultrasonic core holder 4 through the ring pressure pipeline 8 by the constant-pressure constant-flow pump 1, and monitoring ring pressure to enable the ring pressure to reach the pressure required by the experiment; this pressure is generally related to the depth of the core in the formation.
Opening valves at two ends of the middle container A, simultaneously closing valves on a branch parallel to the middle container A, two ends of the middle container B and valves at a ring pressure pipeline, setting parameters of a constant-pressure constant-flow pump 1, injecting formation water in the middle container A into a liquid inlet pipeline 6 of the ultrasonic wave core holder 4, and monitoring liquid inlet pressure;
step seven, after the formation water flows out of the liquid outlet pipeline 10 of the ultrasonic rock core holder 4, setting a back pressure value and monitoring the back pressure;
step eight, enabling the effluent to flow into the seepage automatic calculation system 12, and calculating the initial permeability of the rock core under the formation water condition after the flow is stable;
step nine, setting frequency and power parameters of the ultrasonic transmitter 3, starting the ultrasonic transmitter 3, and transmitting the electric signal to the ultrasonic transducer 2;
step ten, the ultrasonic transducer 5 works under the driving of an electric signal, sends out ultrasonic waves, and longitudinally transmits the ultrasonic waves along the rock core, and the direction of the ultrasonic waves is consistent with the water flow migration direction;
step eleven, opening valves at two ends of the middle container B, simultaneously closing valves on a branch at a position parallel to the middle container B, two ends of the middle container A and valves at a ring pressure pipeline, injecting a surfactant solution in the middle container B into a liquid inlet pipeline 6 of the ultrasonic rock core holder 4 at the same flow rate, monitoring liquid inlet pressure, keeping the back pressure constant, and monitoring back pressure;
step twelve, effluent flows into the seepage automatic calculation system 12, after the flow is stable, the permeability of the rock core under the combined action of the ultrasonic waves and the surfactant is calculated, and the numerical value is compared with the initial permeability of the rock core, so that the improvement range of the permeability of the rock core is calculated.
Specifically, as shown in fig. 1, in the first step, one end of an ultrasonic core holder 4 is provided with an ultrasonic transducer 5, the ultrasonic transducer 5 is connected with an ultrasonic transmitter 3, one end of the ultrasonic core holder 4, which is close to the ultrasonic transducer 5, is connected with a liquid inlet pipeline 6, the other end of the ultrasonic core holder 4 is connected with a liquid outlet pipeline 10, the side wall of the ultrasonic core holder 4 is connected with an annular pressure pipeline 8, the liquid inlet pipeline 6, the liquid outlet pipeline 10 and the annular pressure pipeline 8 are all connected with a branch 13, one end of the branch 13 is connected with a constant-pressure constant-flow pump 1, and the other end is connected with an automatic seepage calculation system 12; the branch 13 is connected with an intermediate container 2 in parallel, the intermediate container 2 comprises an intermediate container A and an intermediate container B which are connected in parallel, and the intermediate container A and the intermediate container B are positioned between the constant-pressure constant-current pump 1 and the liquid inlet pipeline 6; valves are arranged at the two ends of the middle container A and the middle container B which are connected with the branch 13, on the liquid inlet pipeline 6, the annular pressure pipeline 8 and the liquid outlet pipeline 10, the branch 13 is provided with a valve at the position between the annular pressure pipeline 8 and the liquid outlet pipeline 10, and the branch 13 is provided with a valve at the position which is connected with the middle container A and the middle container B in parallel; the liquid inlet pipeline 6 is provided with a liquid inlet pressure sensing system 7, the annular pressure pipeline 8 is provided with an annular pressure automatic monitoring system 9, and the liquid outlet pipeline 10 is provided with a back pressure sensing system 11.
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 (4)
1. An ultrasonic wave and surfactant coupling permeation-increasing experimental method is characterized in that: the method comprises the following steps:
placing a low-permeability sandstone uranium ore core in the middle of an ultrasonic core holder; an ultrasonic transducer is arranged at one end of the ultrasonic rock core holder and connected with an ultrasonic transmitter, a liquid inlet pipeline is connected to one end, close to the ultrasonic transducer, of the ultrasonic rock core holder, a liquid outlet pipeline is connected to the other end of the ultrasonic rock core holder, a ring pressure pipeline is connected to the side wall of the ultrasonic rock core holder, the liquid inlet pipeline, the liquid outlet pipeline and the ring pressure pipeline are all connected with branches, a constant-pressure constant-current pump is connected to one end of each branch, and an automatic seepage calculation system is connected to the other end of each branch; the branch is connected with an intermediate container A and an intermediate container B in parallel, and the intermediate container A and the intermediate container B are positioned between the constant-pressure constant-current pump and the liquid inlet pipeline; valves are arranged at two ends of the middle container A and the middle container B which are connected with the branch, on the liquid inlet pipeline, the annular pressure pipeline and the liquid outlet pipeline, the position of the branch between the annular pressure pipeline and the liquid outlet pipeline is provided with a valve, and the position of the branch connected with the middle container A and the middle container B in parallel is provided with a valve; a liquid inlet pressure sensing system is arranged on the liquid inlet pipeline, an automatic ring pressure monitoring system is arranged on the ring pressure pipeline, and a back pressure sensing system is arranged on the liquid outlet pipeline;
filling distilled water into a constant-pressure constant-flow pump;
step three, filling the intermediate container A with formation water, wherein the formation water is matched with the formation where the core is located;
filling the intermediate container B with a prepared surfactant solution, wherein the solution is obtained by matching the surfactant with the formation water;
injecting distilled water into an annular space of the ultrasonic rock core holder through an annular pressure pipeline by a constant-pressure constant-flow pump, and monitoring annular pressure to enable the annular pressure to reach the pressure required by the experiment;
step six, setting parameters of a constant-pressure constant-flow pump, injecting the formation water in the middle container A into a liquid inlet pipeline of the ultrasonic rock core holder, and monitoring liquid inlet pressure;
step seven, after the formation water flows out of a liquid outlet pipeline of the ultrasonic rock core holder, setting a back pressure value and monitoring the back pressure;
step eight, enabling the effluent to flow into an automatic seepage calculation system, and calculating the initial permeability of the rock core under the formation water condition after the flow is stable;
setting frequency and power parameters of the ultrasonic transmitter, starting the ultrasonic transmitter, and transmitting the electric signal to the ultrasonic transducer;
step ten, the ultrasonic transducer works under the driving of an electric signal, sends out ultrasonic waves, and longitudinally transmits the ultrasonic waves along the rock core, wherein the ultrasonic waves are consistent with the water flow migration direction;
step eleven, injecting the surfactant solution in the intermediate container B into a liquid inlet pipeline of the ultrasonic rock core holder at the same flow rate, monitoring the liquid inlet pressure, keeping the back pressure unchanged, and monitoring the back pressure;
and step twelve, enabling the effluent to flow into an automatic seepage calculation system, calculating the permeability of the rock core under the combined action of the ultrasonic waves and the surfactant after the flow is stable, and calculating the improvement range of the permeability of the rock core by comparing the value with the initial permeability of the rock core.
2. The experimental method for the ultrasonic wave and surfactant coupling permeation enhancement according to claim 1, characterized in that: in the fifth step, the valves at the two ends of the intermediate container A and the intermediate container B need to be closed, the valves at the liquid inlet pipeline and the liquid outlet pipeline and the valves on the branch between the annular pressure pipeline and the liquid outlet pipeline are closed at the same time, and the other valves are opened.
3. The experimental method for the ultrasonic wave and surfactant coupling permeation enhancement according to claim 2, characterized in that: and step six, valves at two ends of the intermediate container A need to be opened, and valves on a branch at a position parallel to the intermediate container A, valves at two ends of the intermediate container B and valves at the ring pressure pipeline are closed at the same time.
4. The experimental method for the ultrasonic wave and surfactant coupling permeation enhancement according to claim 3, characterized in that: in the eleventh step, the valves at the two ends of the intermediate container B need to be opened, and the valves on the branch parallel to the intermediate container B, the two ends of the intermediate container A and the valves at the ring pressure pipeline are closed at the same time.
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| US4773254A (en) * | 1987-07-07 | 1988-09-27 | Chevron Research Company | Automated steady state relative permeability measurement system |
| CN102031955B (en) * | 2010-09-27 | 2013-04-17 | 中国石油大学(华东) | Ultrasonic-assisted reservoir stratum chemical blockage removal experimental facility and experimental method |
| CN103967463B (en) * | 2013-02-05 | 2016-09-07 | 中国石油化工股份有限公司 | Strengthening flooding method |
| CN105675469B (en) * | 2016-01-25 | 2018-03-06 | 中国矿业大学 | Rock Full-automatic gas permeability test system and measuring method |
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| CN107462508B (en) * | 2017-08-16 | 2018-10-02 | 西南石油大学 | A kind of multi- scenarios method seepage flow multifunction experiment apparatus and test method |
| CN109538176B (en) * | 2017-09-22 | 2021-06-15 | 中国石油化工股份有限公司 | Nitrogen composite huff and puff physical simulation experiment device and method for low-permeability reservoir |
| CN111487172A (en) * | 2019-01-28 | 2020-08-04 | 中国石油天然气股份有限公司 | Device and method for evaluating flow conductivity of acid-etched fracture of tight reservoir core |
| CN111088968B (en) * | 2019-12-24 | 2022-01-21 | 中国石油化工股份有限公司 | Ultrasonic viscous oil viscosity reduction dynamic simulation experiment device and method |
| CN111413230B (en) * | 2020-05-12 | 2021-03-16 | 燕山大学 | High-voltage pulse water injection excited sandstone micro-damage detection experimental device and method |
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