CN112924535A - Large-scale experimental device and method for detecting magnetic signals in solute transport under saturated medium - Google Patents
Large-scale experimental device and method for detecting magnetic signals in solute transport under saturated medium Download PDFInfo
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- 238000012360 testing method Methods 0.000 claims abstract description 51
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 16
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- 230000005672 electromagnetic field Effects 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 119
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- 238000005192 partition Methods 0.000 claims description 17
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- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
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- 239000002245 particle Substances 0.000 claims 1
- 230000002787 reinforcement Effects 0.000 claims 1
- 238000005553 drilling Methods 0.000 abstract description 10
- 238000012544 monitoring process Methods 0.000 abstract description 2
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- 229910052755 nonmetal Inorganic materials 0.000 description 3
- 238000007781 pre-processing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
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Abstract
The invention relates to the technical field of solute transport, in particular to a large-scale experimental device for detecting magnetic signals in a solute transport process under a saturated medium. The device comprises a sample introduction unit, a pretreatment unit and a sand box test unit, wherein the sample introduction unit is connected with the sand box test unit through a pipeline, and the pretreatment unit is arranged on a connecting pipeline of the sample introduction unit and the sand box test unit. The device lets it be applicable to the magnetic signal inversion through adjusting the sand box proportion to can add the fixed source magnetic field when the magnetic signal is not enough, produce alternating electromagnetic field reinforcing magnetic signal, drill into a plurality of drilling simultaneously at the lateral wall and carry out the sample collection of different positions, sand box bottom and bottom are consolidated through the plank all around, avoid the too big deformation breakage that leads to the sand box junction of sand box internal pressure, the sand box wraps up with thermal insulation material, be used for maintaining the temperature stability in the experimentation. The whole set of experimental device does not contain any metal material, thereby avoiding the interference on the monitoring of the magnetic signal.
Description
The technical field is as follows:
the invention belongs to the technical field of solute transport, and particularly relates to a large-scale experimental device and method for detecting magnetic signals in a solute transport process under a saturated medium.
Background art:
the inversion of deep saturated aquifer reservoir structural features has been the bottleneck problem of current exploration technologies, and the most important problem is that inversion analysis is carried out through water outlet concentration data during the tracking technology applied at present, real-time monitoring can not be carried out on material signals in the aquifer, and the result that the tracking technology obtains is two-dimensional, and three-dimensional tracking can not be carried out on the reservoir. In order to solve the problem, research and development of a new exploration technology become an important research direction, wherein the magnetic detection technology is expected to solve the problem, in the research and development process of the magnetic detection technology, indoor experiment development is particularly important, but at present, the experiment is often difficult to simulate the structural characteristics of a deep aquifer reservoir, because the experiment is carried out, due to the change of the temperature and the pressure of a sand box reservoir medium and injected fluid, local collapse exists, and further, a priority flow exists in the migration process, the inversion result of the experiment is influenced, meanwhile, the background value of a magnetic signal is strong, and therefore, the existing experiment device is also lack of a large experiment device and an experiment method which can monitor, enhance and carry out magnetic signal inversion.
Disclosure of Invention
The invention discloses a large-scale experimental device for detecting a magnetic signal in solute transport under a saturated medium, which aims to solve any of the technical problems and other potential problems in the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows: a large-scale experimental device for detecting magnetic signals in solute transport under a saturated medium comprises a sample introduction unit, a pretreatment unit and a sand box test unit,
the sample introduction unit is used for introducing and supplementing samples into the experimental device,
the pretreatment unit is used for stabilizing the internal pressure of the sand box test unit and avoiding local sand layer collapse caused by temperature and pressure changes in the experimental process;
the sand box testing unit is used for realizing inversion of the process of carrying out magnetic signal on solute transport by simulating fluid flow under a saturated medium in a magnetic field environment,
the sample introduction unit is connected with the sand box testing unit through a pipeline, and the pretreatment unit is arranged on a connecting pipeline of the sample introduction unit and the sand box testing unit.
Further, the sample introduction unit comprises a water tank, a sample bottle, magnetic particles and a heating device,
wherein the heating device is arranged in the water tank, the water outlet of the water tank is connected with one end of the sand box testing unit through a pipeline, the magnetic particles are arranged in the sample bottle, the sample bottle is connected with the pipeline between the water tank and the sand box testing unit,
a sample bottle valve is arranged at the outlet of the sample bottle,
and a water tank valve is arranged at the water outlet of the water tank.
Further, the preprocessing unit includes: the system comprises a vacuum pump, a first pressure gauge, a first peristaltic pump, a booster pump and a second peristaltic pump;
the booster pump, the first peristaltic pump and the first pressure gauge are sequentially arranged on a pipeline between the sample bottle and the sand box testing unit, and the vacuum pump is connected with one end of the sand box testing unit;
the second peristaltic pump is arranged at a water outlet of the sand box testing unit.
Further, the sand box testing unit comprises a sand box, a sand box reinforcing base, a perforated clapboard, a magnetic probe and an energy transmitting device,
wherein, the two ends of the sand box are respectively provided with a water inlet and a water outlet, the water inlet is respectively connected with a pipeline connected with the water outlet of the water tank,
a drilling hole for installing the magnetic probe is arranged on a sand box top plate of the sand box, the magnetic probe is inserted into the sand box through the drilling hole,
the 2 porous clapboards are respectively arranged inside the sand box and are respectively close to the water inlet and the water outlet,
the launching device is arranged on the side wall of one end of the water inlet of the sand box;
the sand box is arranged on the sand box reinforcing base.
Furthermore, the sand box testing unit also comprises a filter screen and an insulating layer,
the filter screen is arranged on one side of the water outlet end of the porous partition plate and is in close contact with the porous partition plate;
reinforcing devices are further arranged on two sides of the bottom of the porous partition plate;
the heat-insulating layer is arranged on the outer side wall of the sand box.
Furthermore, the number of the sand box top plate drill holes is multiple, and the sand box top plate drill holes are arranged at equal intervals;
and a sealing gasket is arranged at the joint of the top plate of the sand box and the side wall of the sand box.
Further, the length of the flask: the height is greater than 6:1,
the volume of the sand box is not less than 250l, and the distance between the drill holes is not more than 500 mm;
the sand box, the porous partition plate, the filter screen and the sand box reinforcing base are all made of non-metal materials.
Further, the energy emitting device is a magnetic emitting device.
The invention also aims to provide a method for detecting a magnetic signal in solute transport under a saturated medium by adopting the device, which comprises the following steps:
s1), assembling the experimental device, filling the sand layer into the sand box of the sand box testing unit, compacting the sand layer of the sand box testing unit through the preprocessing unit,
s1), assembling the experimental device, filling a sand layer into the sand box of the sand box test unit, sealing the drilled hole by using a plug, compacting the sand layer of the sand box test unit by using the pretreatment unit,
s2) starting the heating device to maintain the medium in the water tank at or above room temperature, starting the sample injection unit to slowly inject the fluid medium into the sand layer in the sand box, opening the water outlet of the sand box test unit after the fluid medium in the sand layer in the sand box is saturated, adjusting the second peristaltic pump and the first peristaltic pump to maintain a certain flow velocity of the medium, then starting the energy emission device to emit energy waves into the sand box,
s3) opening a sample bottle valve to enable magnetic particles in the sample bottle to enter a sand layer in the sand box through a flowing medium, wherein an alternating electromagnetic field generated by energy waves is interfered by the magnetic particles, and a top magnetic probe records magnetic signals to realize an inversion experiment of the magnetic signals on a solute migration process.
Further, the flow rate in S2) is not higher than 20 ml/S; the highest concentration of the magnetic particles in the sand box is not lower than 1mg/L, and the medium is deionized water.
The invention has the beneficial effects that: by adopting the technical scheme, the experimental device can separately inject water and detection liquid, and the detection liquid can be injected at any time, so that the problem of preferential flow in the existing saturated aquifer is solved, the temperature and the pressure in the whole experimental process are stabilized, the sand layer is subjected to vacuum pumping compression before the experiment, holes are drilled at a fixed interval on the top plate for inverting the magnetic signal, and the proportion of the sand box is adjusted to be long: the height is more than 6:1, magnetic signal ground inversion is realized, experimental magnetic signals are inverted to solute migration process, a fixed source magnetic field is added, magnetic nanoparticles are added in the implementation process, and magnetic signals are enhanced. The device considers the problems that the pressure is large under a saturated medium and the sand box is broken, and non-metal materials are used for reinforcing the perforated partition plate and the bottom of the sand box.
Description of the drawings:
for the purpose of illustrating the detailed technical solutions of the embodiments of the present invention, the drawings of the key structures in the description of the embodiments are introduced, and the drawings and the labeled dimensions are only used for explanation and illustration and do not limit the present invention.
The attached drawings used here do not describe the heat insulating material wrapped outside the sand box for convenience of explaining the structure
FIG. 1 is a schematic structural diagram of a large-scale experimental apparatus for detecting magnetic signals in solute transport under a saturated medium according to the present invention.
FIG. 2 is a top view of a flask (without a top plate) according to an embodiment of the present invention.
Fig. 3 is a structural view of a perforated separator of the present invention.
FIG. 4 is a schematic diagram of the electromagnetic process of the present invention.
In the figure:
1. a sand box top plate; 2. drilling a sand box top plate; 3. a magnetic probe; 4. a top plate screw; 5. a gasket; 6. a water outlet manometer; 7. a water valve and a sampling position; 8. a second peristaltic pump; 9. a vertical water valve and a sampling position are arranged on the side wall of the sand box; 10. a third peristaltic pump; 11. a sand box reinforcing base; 12. a horizontal water valve and a sampling position are arranged on the side wall of the sand box; 13. a perforated clapboard and a filter screen; 14. a perforated baffle plate reinforcing device; 15. a vacuum pump water valve; 16. a water inlet manometer; 17. a compartment; 18. a vacuum pump; 19. a water inlet valve; 20. a first peristaltic pump; 21. a booster pump; 22. a sample bottle; 23. a water tank; 24. a heating device; 25. a water tank valve; 26. a sample bottle valve; 27. a magnetic emitting device; 28. magnetic particles.
Specific embodiments of the method
Reference will now be made in detail to the embodiments of the present invention, which are only a part of the examples of the present invention, wherein the numerals and elements described represent elements having the same or similar functions, and other embodiments obtained by those skilled in the art without inventive efforts shall fall within the scope of the examples of the present invention.
For the purpose of facilitating understanding of the embodiments of the present invention, the detailed description will be given with reference to the accompanying drawings, and the following description is not intended to limit the embodiments of the present invention.
As shown in figure 1, the large-scale experimental device for detecting the magnetic signal in the solute transport under the saturated medium comprises a sample introduction unit, a pretreatment unit and a sand box test unit,
the sample introduction unit is used for introducing and supplementing samples into the experimental device,
the pretreatment unit is used for stabilizing the internal pressure of the sand box test unit and avoiding local sand layer collapse caused by temperature and pressure changes in the experimental process;
the sand box testing unit is used for realizing inversion of the process of carrying out magnetic signal on solute transport by simulating fluid flow under a saturated medium in a magnetic field environment,
the sample introduction unit is connected with the sand box testing unit through a pipeline, and the pretreatment unit is arranged on a connecting pipeline of the sample introduction unit and the sand box testing unit.
The sample introduction unit comprises a water tank, a sample bottle, magnetic particles and a heating device,
wherein the heating device is arranged in the water tank, the water outlet of the water tank is connected with one end of the sand box testing unit through a pipeline, the magnetic particles are arranged in the sample bottle, the sample bottle is connected with the pipeline between the water tank and the sand box testing unit,
a sample bottle valve is arranged at the outlet of the sample bottle,
and a water tank valve is arranged at the water outlet of the water tank.
The preprocessing unit includes: the system comprises a vacuum pump, a first pressure gauge, a first peristaltic pump, a booster pump and a second peristaltic pump;
the booster pump, the first peristaltic pump and the first pressure gauge are sequentially arranged on a pipeline between the sample bottle and the sand box testing unit, and the vacuum pump is connected with one end of the sand box testing unit;
the second peristaltic pump is arranged at a water outlet of the sand box testing unit.
The sand box testing unit comprises a sand box, a sand box reinforcing base, a perforated clapboard, a magnetic probe and an energy transmitting device,
wherein, the two ends of the sand box are respectively provided with a water inlet and a water outlet, the water inlet is respectively connected with a pipeline connected with the water outlet of the water tank,
a drilling hole for installing the magnetic probe is arranged on a sand box top plate of the sand box, the magnetic probe is inserted into the sand box through the drilling hole,
the 2 porous clapboards are respectively arranged inside the sand box and are respectively close to the water inlet and the water outlet,
the launching device is arranged on the side wall of one end of the water inlet of the sand box;
the sand box is arranged on the sand box reinforcing base.
The sand box testing unit also comprises a filter screen and an insulating layer,
the filter screen is arranged on one side of the water outlet end of the porous partition plate and is in close contact with the porous partition plate;
reinforcing devices are further arranged on two sides of the bottom of the porous partition plate;
the heat-insulating layer is arranged on the outer side wall of the sand box.
The number of the sand box top plate drill holes is multiple, and the sand box top plate drill holes are arranged at equal intervals;
and a sealing gasket is arranged at the joint of the top plate of the sand box and the side wall of the sand box.
The length of the sand box is as follows: the height is greater than 6:1,
the volume of the sand box is not less than 250l, and the distance between the drill holes is not more than 500 mm;
the sand box, the porous partition plate, the filter screen and the sand box reinforcing base are all made of non-metal materials.
The energy emitting device is a magnetic emitting device.
The invention also aims to provide a method for detecting a magnetic signal in solute transport under a saturated medium by adopting the device, which comprises the following steps:
s1), assembling the experimental device, filling a sand layer into the sand box of the sand box test unit, sealing the drilled hole by using a plug, compacting the sand layer of the sand box test unit by using the pretreatment unit,
s2) starting the heating device to maintain the medium in the water tank at or above room temperature, starting the sample injection unit to slowly inject the fluid medium into the sand layer in the sand box, opening the water outlet of the sand box test unit after the fluid medium in the sand layer in the sand box is saturated, adjusting the second peristaltic pump and the first peristaltic pump to maintain a certain flow velocity of the medium, then starting the energy emission device to emit energy waves into the sand box,
s3) opening a sample bottle valve to enable magnetic particles in the sample bottle to enter a sand layer in the sand box through a flowing medium, wherein an alternating electromagnetic field generated by energy waves is interfered by the magnetic particles, and a top magnetic probe records magnetic signals to realize an inversion experiment of the magnetic signals on a solute migration process.
The flow rate in S2) is not higher than 20 ml/S; the highest concentration of the magnetic particles in the sand box is not lower than 1mg/L, and the medium is deionized water.
Example (b):
as shown in fig. 1: the invention relates to a large-scale experimental device for detecting magnetic signals in solute transport under a saturated medium, which comprises: the device comprises a vacuum pump 18, a water inlet valve 19, a first peristaltic pump 20, a booster pump 21, a sample bottle 22, a water tank 23, a heating device 24, a water tank valve 25 and a sample bottle valve 26;
the sand box includes: the sand box comprises a sand box top plate 1, a sand box top plate drilling hole 2, a magnetic probe 3, a top plate screw 4, a rubber mat 5, a water outlet pressure gauge 6, a water valve and sampling position 7, a second peristaltic pump 8, a sand box side wall vertical water valve and sampling position 9, a side wall sampling position peristaltic pump 10, a sand box bottom end reinforcing device 11, a sand box side wall horizontal water valve and sampling position 12, a perforated partition plate, a stainless steel net 13, a perforated partition plate reinforcing device 14, a vacuum pump water valve 15, a water inlet pressure gauge 16 and a compartment 17.
During the experiment:
filling a sand layer into the sand box, screwing a top plate screw 4, screwing a water valve 15 at a water inlet and a water valve 8 at a water outlet sampling position, closing a water valve 12 and a water valve 9 at a sampling position on the side wall of the sand box, closing the top plate drilling hole 2 by using a plug, opening a vacuum pump 17, observing the change of a pressure measuring meter 16 at the water inlet, closing the vacuum pump before the maximum pressure bearing capacity of the sand box is reached (approximately equal to the maximum pressure measuring head under a saturated medium), opening the sand box, and repeating the steps to guide the vacuum pump to exhaust the air so that the sand layer does not generate a depression.
In the second embodiment, on the basis of the first embodiment, the heating device 24 is turned on, the water temperature is maintained at 25 ℃ (above the indoor temperature), the fluid is slowly injected, when the water tank pressure cannot guarantee the height of the water inlet head, the booster pump 21 and the first peristaltic pump 20 are turned on, the fluid is slowly injected (the flow rate should be lower than <20ml/s), the air in the sand box is gradually exhausted, after the medium in the sand box is saturated, the water outlet valve 7 and the second peristaltic pump 8 of the sand box system are turned on, and the peristaltic pump 8 and the peristaltic pump 20 are adjusted to guarantee the stable flow rate (the flow rate should be within the controllable range of the peristaltic pump).
In the third embodiment, a sand layer is filled in the sand layer, a top plate screw 4 is screwed, a water valve 15 at a water inlet and a water valve 8 at a water outlet sampling position, a water valve 12 and a water valve 9 at a sampling position on the side wall of a sand box are used, a top plate drilling hole 2 is closed by a plug, a vacuum pump 18 is opened, the change of a water inlet manometer 16 is observed, the vacuum pump is closed before the maximum pressure bearing capacity of the sand box is reached (approximately equal to the maximum pressure measuring head under a saturated medium), the sand box is opened, the vacuum pump is guided to be free from sinking after the air pumping of the sand layer is conducted by repeating the steps, a heating device 24 is opened and closed, the water temperature is maintained at 25 ℃ (a assumed value), fluid is slowly injected, when the water tank pressure cannot ensure the height of a water inlet head, a booster pump 21 is opened, a first peristaltic pump 20 is used for slowly injecting the fluid (the flow rate is lower than 20ml/s), air in the, and the magnetic probe 3 records magnetic signals and collects water samples at the water outlet.
Example four: on the basis of the first embodiment, a heating device 24 is turned on, the water temperature is maintained at 25 ℃ (above indoor temperature), fluid is slowly injected, when the water tank pressure cannot guarantee the height of a water inlet head, a booster pump 21 and a first peristaltic pump 20 are turned on, the fluid is slowly injected (the flow rate should be lower than <20ml/s), air in the sand box is gradually exhausted, after media in the sand box is saturated, all water valves and peristaltic pumps (7, 8, 9, 10 and 12) of a water outlet and a side wall of the sand box are turned on, the peristaltic pump speed is adjusted to guarantee that the flow rate is stable (the flow rate should be stable in a controllable range of the peristaltic pump), meanwhile, a water valve 25 of the water tank is turned off, a water valve 26 of a sample replenishing bottle is turned.
Example five: filling a sand layer into a sand box, adding a source-fixed magnetic field into a compartment 17, screwing a top plate screw 4, a water valve 15 at a water inlet and a water valve 8 at a water outlet sampling position, a water valve 12 and a water valve 9 at a sampling position on the side wall of the sand box, closing a top plate drilling hole 2 by using a plug, opening a vacuum pump 18, observing the change of a water inlet manometer 16, closing the vacuum pump (approximately equal to the maximum pressure measuring water head under a saturated medium) before the maximum pressure bearing capacity of the sand box is reached, opening the sand box, and repeating the steps to guide the vacuum pump to exhaust air so that the sand layer does not have a depression. And adding magnetic fluid capable of enhancing magnetic signals into the nourishing bottle, and continuing to perform the third embodiment.
It should be noted that the embodiments used in this specification are only a part of the processes, the processes are not necessarily required, and do not include all the experiments that can be performed, and also the steps are not fixed, and the embodiments emphasize that the embodiments are more important than other embodiments, so as to show the innovative features of the embodiments, and the described steps and processes are also combined for a certain research, so that other combinations are possible for achieving different experimental purposes, and the embodiments are only illustrated. In addition, because the structural elements and the names of the parts and similar structures described in the embodiments of the invention are mainly used for facilitating the understanding of persons skilled in the relevant field, other devices or apparatuses can be used for realizing the purpose of the elements, and therefore, simple replacement of the structural elements is also within the protection scope of the invention.
Claims (10)
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| CN112924535B (en) | 2021-11-30 |
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