CN111882966A - Indoor simulation earth pillar experimental apparatus under geothermal tail water sandstone recharge condition - Google Patents
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 150
- 238000004088 simulation Methods 0.000 title claims description 4
- 239000002689 soil Substances 0.000 claims abstract description 67
- 238000005070 sampling Methods 0.000 claims abstract description 20
- 230000002572 peristaltic effect Effects 0.000 claims description 13
- 238000002474 experimental method Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 5
- 229920001971 elastomer Polymers 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 238000003973 irrigation Methods 0.000 description 2
- 230000002262 irrigation Effects 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000004379 similarity theory Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
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Abstract
The invention relates to the field of geothermal tail water recharge, in particular to an indoor simulated soil column experimental device under the geothermal tail water sandstone recharge condition, which comprises a water supply structure, a soil column pipe and a solution collecting structure, wherein the soil column pipe is respectively connected with the water supply structure and the solution collecting structure; the soil column pipe is provided with pressure measuring holes and sampling ports at intervals, the pressure measuring holes are connected with pressure measuring structures used for measuring water pressure, the sampling ports are connected with samplers, and the sampling ports are communicated with the inner cavity of the soil column pipe. The invention has the beneficial effects that: the whole structure is simple, and the sampling is convenient; and the temperature environment under the condition of geothermal tail water sandstone recharge is simulated by the arranged constant-temperature water bath structure, and the condition parameters of a simulated soil column experiment are increased, so that the experiment is more real and accurate.
Description
Technical Field
The invention relates to the field of geothermal tail water recharge, in particular to an indoor simulated soil column experimental device under the geothermal tail water sandstone recharge condition.
Background
The geothermal resource is a clean renewable energy source with large reserve, high efficiency and good stability, and has great significance for energy conservation, emission reduction, global warming and haze treatment. However, with the continuous development of geothermal resources, the groundwater level in local areas tends to drop significantly, which seriously affects the supply guarantee of local water resources and restricts the further exploitation of hydrothermal resources. The problem of recharging the carbonate heat storage is basically solved, and the low recharging rate of the sandstone heat storage becomes the bottleneck of sustainable development and utilization of medium-low temperature geothermal resources. During the process of geothermal resource exploitation and recharge, the phenomena of particle migration, water-rock reaction and the like occur, and parameters such as porosity, permeability and the like of a reservoir layer are changed, so that the seepage force of the reservoir layer is reduced.
How to determine the change of permeability and the water-rock reaction in the recharging process is an important ring for ensuring the sustainable development and utilization of geothermal energy at present. In addition, the existing sandstone indoor simulation soil column experiments mostly concentrate on the aspects of rainwater leaching, pollutant migration, groundwater recharge and the like, and the temperature factor is rarely considered; and some existing sandstone recharge indoor test devices are complex in structure and inconvenient to sample.
Disclosure of Invention
The invention aims to provide an indoor simulated soil column experimental device under the condition of geothermal tail water sandstone recharge, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
an indoor simulated earth pillar experimental device under a geothermal tail water sandstone recharge condition comprises a water supply structure, an earth pillar pipe and a solution collecting structure, wherein the earth pillar pipe is respectively connected with the water supply structure and the solution collecting structure; the soil column pipe is provided with pressure measuring holes and sampling ports at intervals, the pressure measuring holes are connected with pressure measuring structures used for measuring water pressure, the sampling ports are connected with samplers, and the sampling ports are communicated with the inner cavity of the soil column pipe.
As a further scheme of the invention: the constant-temperature water bath structure comprises a water bath box, and a cover plate attached to the earth pillar pipe is arranged at the top of the water bath box.
As a still further scheme of the invention: the water bath box is provided with an opening, and the opening is used for the sampler and the pressure measuring structure to pass through and is also used for observing the water level in the water bath box.
As a still further scheme of the invention: and the water flow buffer areas arranged at the top and the bottom of the soil column pipe are respectively connected with a water supply structure and a solution collection structure.
As a still further scheme of the invention: the pressure measuring structure comprises a pressure measuring pipe and a connecting piece, and the pressure measuring pipe is connected with the pressure measuring hole through the connecting piece.
As a still further scheme of the invention: and a dial gauge for reading is arranged on the piezometric tube.
As a still further scheme of the invention: the water supply structure comprises a water supply tank, a peristaltic pump and a water tank, wherein the water tank is respectively connected with the peristaltic pump and the earth pillar pipe, and water conveyed into the water supply tank by the peristaltic pump supplies water to the water tank.
As a still further scheme of the invention: the water tank is provided with an overflow hole, and the overflow hole is used for keeping the water level in the water tank at a set value.
As a still further scheme of the invention: the solution collecting structure comprises a water collecting tank and a connecting pipe, wherein the water collecting tank is connected with the bottom of the soil column pipe through the connecting pipe.
Compared with the prior art, the invention has the beneficial effects that: the whole structure is simple, and the sampling is convenient; and the temperature environment under the condition of geothermal tail water sandstone recharge is simulated by the arranged constant-temperature water bath structure, and the condition parameters of a simulated soil column experiment are increased, so that the experiment is more real and accurate.
Drawings
Fig. 1 is a schematic structural diagram of an indoor simulated earth pillar experimental device under the condition of geothermal tail water sandstone recharge.
FIG. 2 is a top view of a constant-temperature water bath structure in an indoor simulated earth pillar experimental device under a geothermal tail water sandstone recharge condition.
In the drawings: 1-water supply tank; 2-a peristaltic pump; 3-a water tank; 4-water flow buffer zone; 5-a percolation region; 6-a sampler; 7-constant temperature water bath; 8-an overflow aperture; 9-pressure measuring hole; 10-sieve plate; 11-a solution collection structure; 12-a first cap; 13-outlet of rubber tube; 14-earth pillar tube plug-in mounting port; 15-second cover.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
Referring to fig. 1-2, in the embodiment of the present invention, an indoor simulated soil column experimental apparatus under geothermal tail water sandstone recharge conditions includes a water supply structure, a soil column pipe and a solution collection structure, where the soil column pipe is respectively connected to the water supply structure and the solution collection structure, and a constant temperature water bath structure is arranged on an outer circumference of the soil column pipe and is used to keep a temperature of the soil column pipe within a set range; the soil column pipe is provided with pressure measuring holes 9 and sampling ports at intervals, the pressure measuring holes 9 are connected with a pressure measuring structure for measuring water pressure, the sampling ports are connected with a sampler 6, and the sampling ports are communicated with the inner cavity of the soil column pipe.
Specifically, the thermostatic waterbath structure comprises a water bath tank, and a cover plate attached to the earth pillar pipe is arranged at the top of the water bath tank. The water bath box is 70cm high, the cuboid structure of each 40cm of length width, the apron is formed by first top cap 12 and the 15 concatenation of second top cap. Inserting a soil column pipe into the water bath tank, and immersing the bottom of the soil column pipe in the water bath tank at a position which is 70cm high; preparing target granularity according to the particle level of a field actual field, and reducing the actual length of the irrigation field, the water head pressure and the pressure of the reinjection water head to the indoor water head pressure according to a geometric similarity theory in a proper proportion; and (3) installing and fixing a water bath box and a soil column pipe, then adding soil into the soil column pipe layer by layer, tamping every time when the soil column pipe is filled with 3-4 cm, carrying out water saturation and exhaust by using geothermal water until the soil column is completely saturated, and adding geothermal tail water into a water supply structure. And (3) opening the water bath tank to keep the temperature of the water bath tank within a set range stably, opening the water supply structure, filling water into the soil column pipe according to a set flow rate, observing the pressure change of each position on the soil column pipe through the pressure measuring structure, sampling through the sampler 6, calculating the hydraulic gradient, and estimating the water-rock reaction generated in the recharging process. Simple structure, the sample is convenient, and can simulate the recharge condition of actual formation temperature, has improved the accuracy and the reliability of experiment.
Referring to fig. 2, in the embodiment of the present invention, the water bath box is provided with an opening, and the opening is used for allowing the sampler and the pressure measuring structure to pass through and for observing the water level in the water bath box.
Specifically, the water bath box is a constant temperature water bath box 7, the holes are respectively a rubber tube outlet 13 and a soil column tube inserting opening 14, the rubber tube outlet is used for the sampler 6 and the pressure measuring structure to pass through, the soil column tube inserting opening 14 is used for the soil column tube to pass through, and the water level in the constant temperature water bath box 7 can be observed through the soil column tube inserting opening 14. Through the water level in the constant temperature water bath box 7 is looked over to earth pillar cartridge mouth, in time moisturizing guarantees that the water level is in normal condition, realizes keeping the constant temperature of earth pillar pipe.
Referring to fig. 1, in the embodiment of the present invention, a water flow buffer zone 4 and a seepage zone 5 separated by a sieve plate 10 are disposed in the soil column tube, and the water flow buffer zones 4 disposed at the top and the bottom of the soil column tube are respectively connected to a water supply structure and a solution collection structure 11.
Specifically, the two sieve plates 10 are respectively arranged at a position 5cm away from the end part of the earth pillar to form an upper water flow buffer zone 4 and a lower water flow buffer zone 5 which are 5cm long and a middle seepage zone 5. The number of the sampling ports is 5, the sampling ports are respectively located at positions 20cm, 40cm, 60cm, 75cm and 90cm away from the bottom of the earth pillar tube, and each sampling port is connected with a sampler 6. Water-rock reactions and distribution characteristics occurring at different time points and in the vertical direction of the sandstone after geothermal tail water is injected are analyzed through sampling at different depths. The soil column pipe is made of organic glass with the thickness of 5mm, the height is 110cm, and the inner diameter is 14 cm.
Referring to fig. 1, in the embodiment of the present invention, the pressure measuring structure includes a pressure measuring tube and a connecting member, and the pressure measuring tube is connected to the pressure measuring hole through the connecting member.
Specifically, the number of the pressure measuring holes is 22, the number of the water flow buffer areas 4 at the top and the bottom of the soil column tube is 1 respectively, and each interval in the seepage area 5 is 5 cm; the connecting piece is a rubber tube, the pressure measuring hole is connected with the pressure measuring tube through the rubber tube, and the pressure change conditions of different parts can be comprehensively observed through observation.
Referring to fig. 1, in a preferred embodiment of the present invention, a scale for reading is provided on the piezometer tube.
The scale can have related coordinate data, so that reading is convenient. Or coordinate paper is laid behind the pressure measuring pipe to replace a dial gauge for reading, so that the cost is saved.
Referring to fig. 1, in the embodiment of the present invention, the water supply structure includes a water supply tank 1, a peristaltic pump 2 and a water tank 3, the water tank 3 is respectively connected to the peristaltic pump 2 and a soil pillar, and the peristaltic pump 2 transports water in the water supply tank 1 to supply water to the water tank 3.
Specifically, the other end of the peristaltic pump 2 is communicated with the water supply tank 1, and water in the water supply tank 1 is sent into the water tank 3; the water flow speed sent into the earth pillar tube is controlled by the peristaltic pump 2.
Further, an overflow hole 8 is formed in the water tank, and the overflow hole 8 is used for keeping the water level in the water tank 3 at a set value. I.e. the overflow aperture 8 controls the head. The water head is stably adjusted through the water tank 3, and the geothermal tail water recharge condition under different flow conditions is simulated; the bottom of the earth pillar tube is heated by combining a constant-temperature water bath structure, so that the recharge condition of the actual formation temperature is simulated.
Referring to fig. 1, in the embodiment of the present invention, the solution collecting structure 11 includes a water collecting tank and a connecting pipe, and the water collecting tank is connected to the bottom of the soil pillar pipe through the connecting pipe.
Specifically, the connecting pipe extends from the upper edge of the constant-temperature water bath tank 7 along a bend, and is communicated with the water flow buffer area 4 at the bottom of the soil column pipe and the water collecting tank, so that water permeating through the water flow buffer area 4 at the bottom of the soil column pipe is collected.
The working principle of the invention is as follows: preparing target granularity according to the particle level of a field actual field, and reducing the actual length of the irrigation field, the water head pressure and the pressure of the reinjection water head to the indoor water head pressure according to a geometric similarity theory in a proper proportion; and (3) installing and fixing a water bath box and a soil column pipe, then adding soil into the soil column pipe layer by layer, tamping every time when the soil column pipe is filled with 3-4 cm, carrying out water saturation and exhaust by using geothermal water until the soil column is completely saturated, and adding geothermal tail water into a water supply structure. And (3) opening the water bath tank to keep the temperature of the water bath tank within a set range stably, opening the water supply structure, filling water into the soil column pipe according to a set flow rate, observing the pressure change of each position on the soil column pipe through the pressure measuring structure, sampling through the sampler 6, calculating the hydraulic gradient, and estimating the water-rock reaction generated in the recharging process.
It should be noted that the peristaltic pump used in the present invention is an application of the prior art, and those skilled in the art can implement the intended function according to the related description, or implement the technical characteristics to be accomplished by the similar technology, and will not be described in detail herein.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (9)
1. An indoor simulated soil column experimental device under a geothermal tail water sandstone recharge condition comprises a water supply structure, a soil column pipe and a solution collecting structure, wherein the soil column pipe is respectively connected with the water supply structure and the solution collecting structure; the soil column pipe is provided with pressure measuring holes and sampling ports at intervals, the pressure measuring holes are connected with pressure measuring structures used for measuring water pressure, the sampling ports are connected with samplers, and the sampling ports are communicated with the inner cavity of the soil column pipe.
2. The indoor simulated soil column experimental device under the geothermal tail water sandstone recharge condition as claimed in claim 1, wherein the constant-temperature water bath structure comprises a water bath tank, and a cover plate attached to a soil column pipe is arranged at the top of the water bath tank.
3. The indoor simulated soil column experimental device under the geothermal tailwater sandstone recharge condition as claimed in claim 2, wherein the water bath box is provided with an opening, and the opening is used for the sampler and the pressure measuring structure to pass through and is also used for observing the water level in the water bath box.
4. The indoor simulation soil column experimental device under the geothermal tail water sandstone recharge condition as claimed in claim 1, wherein a water flow buffer area and a seepage area which are formed by separating a sieve plate are arranged in the soil column tube, and the water flow buffer areas arranged at the top and the bottom of the soil column tube are respectively connected with a water supply structure and a solution collection structure.
5. The indoor simulated soil column experimental facility under the geothermal tailwater sandstone recharge condition as claimed in claim 1, wherein the pressure measuring structure comprises a pressure measuring pipe and a connecting piece, and the pressure measuring pipe is connected with a pressure measuring hole through the connecting piece.
6. The indoor simulated soil column experimental facility under the geothermal tail water sandstone recharge condition as claimed in claim 5, wherein a scale table for reading is arranged on the piezometric tube.
7. The indoor simulated soil column experimental device under the geothermal tail water sandstone recharge condition as claimed in claim 1, wherein the water supply structure comprises a peristaltic pump and a water tank, the water tank is respectively connected with the peristaltic pump and a soil column pipe, and the peristaltic pump supplies water to the water tank.
8. The indoor simulated soil column experimental facility under the geothermal tail water sandstone recharge condition as claimed in claim 7, wherein the water tank is provided with an overflow hole.
9. The indoor simulated soil column experimental facility under the geothermal tailwater sandstone recharge condition of claim 1, wherein the solution collection structure comprises a water collection tank and a connecting pipe, and the water collection tank is connected with the bottom of the soil column pipe through the connecting pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010693703.2A CN111882966A (en) | 2020-07-17 | 2020-07-17 | Indoor simulation earth pillar experimental apparatus under geothermal tail water sandstone recharge condition |
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| CN202010693703.2A CN111882966A (en) | 2020-07-17 | 2020-07-17 | Indoor simulation earth pillar experimental apparatus under geothermal tail water sandstone recharge condition |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112799A (en) * | 2021-12-01 | 2022-03-01 | 暨南大学 | Device and method for simulating micro plastic solution migration under different conditions |
| CN114428041A (en) * | 2022-01-25 | 2022-05-03 | 成都理工大学 | Water bath type temperature control overflow system pollutant migration tester |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109187285A (en) * | 2018-10-19 | 2019-01-11 | 中国科学院寒区旱区环境与工程研究所 | Seepage through soil mass experimental rig |
| CN110726657A (en) * | 2019-11-15 | 2020-01-24 | 中国华能集团清洁能源技术研究院有限公司 | Device for visually evaluating influence of tail water recharge on core sample |
| CN110736822A (en) * | 2019-11-26 | 2020-01-31 | 长安大学 | method for simulating groundwater evaporation and soil column experimental device thereof |
| CN110749703A (en) * | 2019-11-05 | 2020-02-04 | 山东省地勘局第二水文地质工程地质大队(山东省鲁北地质工程勘察院) | Method for simulating sandstone thermal storage geothermal tail water recharge and tracing experiment |
-
2020
- 2020-07-17 CN CN202010693703.2A patent/CN111882966A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109187285A (en) * | 2018-10-19 | 2019-01-11 | 中国科学院寒区旱区环境与工程研究所 | Seepage through soil mass experimental rig |
| CN110749703A (en) * | 2019-11-05 | 2020-02-04 | 山东省地勘局第二水文地质工程地质大队(山东省鲁北地质工程勘察院) | Method for simulating sandstone thermal storage geothermal tail water recharge and tracing experiment |
| CN110726657A (en) * | 2019-11-15 | 2020-01-24 | 中国华能集团清洁能源技术研究院有限公司 | Device for visually evaluating influence of tail water recharge on core sample |
| CN110736822A (en) * | 2019-11-26 | 2020-01-31 | 长安大学 | method for simulating groundwater evaporation and soil column experimental device thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112799A (en) * | 2021-12-01 | 2022-03-01 | 暨南大学 | Device and method for simulating micro plastic solution migration under different conditions |
| CN114428041A (en) * | 2022-01-25 | 2022-05-03 | 成都理工大学 | Water bath type temperature control overflow system pollutant migration tester |
| CN114428041B (en) * | 2022-01-25 | 2023-08-15 | 成都理工大学 | Pollutant migration tester for water bath type temperature control overflow system |
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