CN110763432A - Simulation test method for monitoring geothermal recharge three-dimensional temperature field - Google Patents
Simulation test method for monitoring geothermal recharge three-dimensional temperature field Download PDFInfo
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- CN110763432A CN110763432A CN201911069697.7A CN201911069697A CN110763432A CN 110763432 A CN110763432 A CN 110763432A CN 201911069697 A CN201911069697 A CN 201911069697A CN 110763432 A CN110763432 A CN 110763432A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K3/00—Thermometers giving results other than momentary value of temperature
- G01K3/08—Thermometers giving results other than momentary value of temperature giving differences of values; giving differentiated values
- G01K3/14—Thermometers giving results other than momentary value of temperature giving differences of values; giving differentiated values in respect of space
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention relates to a simulation test method for monitoring a geothermal recharge three-dimensional temperature field, which comprises the following steps of: and paving a simulated sand tank, wherein the upper part adopts clay as a water-resisting layer, the lower part adopts sandstone as a heat reservoir, and a plurality of pressure sensors are arranged in the sandstone and are numbered. The invention has the advantages that: the method for monitoring the water temperature of the geothermal wells in one step among and around the production and irrigation wells or at different plane positions and distances in the actual engineering is changed, the spatial heat storage temperature monitoring in vertical and horizontal directions which can be simultaneously and real-timely realized, the three-dimensional monitoring of the geothermal water temperature field in the production and irrigation engineering operation is realized, and scientific and reasonable data support is provided for reasonable well spacing research under different production and irrigation conditions.
Description
Technical Field
The invention relates to a simulation test method for monitoring a geothermal recharge three-dimensional temperature field, and relates to the research in the field of geothermal resources.
Background
Geothermal recharging is to extract geothermal water from a production well, and to recharge a recharging well which is hydraulically connected with the production well after being utilized, wherein gravity is utilized as the motive power of natural fluid, and the driving force of seepage water flow is formed by the water head difference of a pumping and recharging well group, and the driving force is expressed as follows: the geothermal water level falling funnel is formed by taking the exploitation well as the center, the water level of the periphery far away from the exploitation well is gradually higher, geothermal water tends to converge from the periphery to the exploitation well, the water level of the recharge well as the center is highest, the periphery is gradually reduced, and geothermal water tends to diffuse from the recharge well to the periphery, as shown in figure 1.
The recharging water source is generally used geothermal water, the temperature of the recharging water source is greatly lower than the original temperature of a heat reservoir, the recharging water source is mixed with the geothermal water in the heat reservoir, the temperature is reduced, along with the continuous recharging, the recharging water is gradually mixed with the high-temperature hydrothermal water in the heat reservoir while being transported, weak supply of a geothermal source is received, low-temperature recharging water gradually forms a cooling field around the recharging well, a cold front extends to different degrees around according to hydraulic gradient, when the cold front is transported to a mining well, the mining water temperature is reduced, and the normal use of geothermal development engineering is influenced when the cold front is reduced to a certain degree. Therefore, the characteristics of the recharging temperature field are important contents in the research work of recharging technology, which are related to the service life of the mining and recharging project.
In the prior art, due to the fact that the geothermal well construction technology is relatively difficult, cost is high, few geothermal wells with the same level exist among the production and irrigation wells, only the water temperature of the production and irrigation wells can be obtained in the production and irrigation process, the change of the water temperature is difficult to detect in one or a plurality of continuous heating seasons, or even if observation wells exist around, the direction and the position of the production and irrigation wells are greatly different, and in the production and irrigation process, the obtained disposable water temperature monitoring data are not enough to reflect the spatial change characteristics of the geothermal water temperature of a thermal reservoir under the action of a funnel effect. Particularly, in the test process, errors occur in observation, the measurement precision is affected, namely, the temperature field characteristics under the mining and irrigating conditions cannot be correctly judged and known, and scientific and reasonable data support cannot be provided for reasonable well spacing research under different mining and irrigating conditions.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a simulation test method for monitoring a geothermal recharge three-dimensional temperature field, which has the technical scheme that:
a simulation test method for monitoring a geothermal recharge three-dimensional temperature field comprises the following steps:
(1) laying a simulated sand tank, wherein the upper part adopts clay as a water-resisting layer, the lower part adopts sandstone as a heat reservoir, and a plurality of pressure sensors are arranged in the sandstone and numbered;
(2) arranging a production well and a recharge well which penetrate through a water-resisting layer and a thermal reservoir, wherein the distance between the production well and the recharge well is not less than 10m, and uniformly and equidistantly arranging water level monitoring wells at the same layer between the production well and the recharge well and at the peripheries of the production well and the recharge well; distributing pressure water level meters in the production well, the recharge well and the water level monitoring well, wherein pressure sensors and temperature sensors are arranged in the recharge well and the production well; all the pressure sensors, the pressure water level meters and the temperature sensors are connected to a computer through a data acquisition unit;
(3) configuring pumping equipment, recharging equipment and pipelines: the water pumping equipment is arranged in the production well, and the water supply pipeline is communicated with the water pumping equipment and distributed in the production well; the recharging pipeline is distributed in the recharging well, and the recharging equipment is used as water treatment equipment and is installed and connected between the water supply pipeline and the recharging pipeline;
(4) recording start-stop time and frequency of data by using a computer, starting a simulation test, filtering water pumped by a mining well through a filter to form filtered water serving as a recharging water source, regulating flow rate in combination with water level change, recharging the filtered water into a recharging well, acquiring temperature change data of a thermal storage space in the recharging well at different time intervals through a temperature sensor, realizing real-time three-dimensional monitoring of temperature fields of the mining well and the recharging well, and drawing a three-dimensional seepage field, a hydrodynamic field and a temperature field distribution diagram under a geothermal mining and recharging condition based on COMSOL software;
(5) the real-time three-dimensional monitoring of the geothermal water temperature field is realized by utilizing the acquired temperature field monitoring data and combining the water production and irrigation quantity and the dynamic characteristic data of the water level of the monitoring well, and the temperature monitoring data of different spatial positions are acquired.
A plurality of pressure sensors are distributed in the sandstone in a grid shape.
The invention has the advantages that: the method for monitoring the water temperature of the geothermal wells in one step among and around the production and irrigation wells or at different plane positions and distances in the actual engineering is changed, the spatial heat storage temperature monitoring in vertical and horizontal directions which can be simultaneously and real-timely realized, the three-dimensional monitoring of the geothermal water temperature field in the production and irrigation engineering operation is realized, and scientific and reasonable data support is provided for reasonable well spacing research under different production and irrigation conditions.
Drawings
FIG. 1 is a schematic diagram of the arrangement of the structural layers of the present invention.
Fig. 2 is a schematic diagram of the arrangement of pressure sensors of the thermal reservoir of fig. 1.
Detailed Description
The invention will be further described with reference to specific embodiments, and the advantages and features of the invention will become apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
Referring to fig. 1 and 2, the invention relates to a simulation test method for monitoring a geothermal recharge three-dimensional temperature field, which is characterized by comprising the following steps:
(1) laying a simulated sand tank, wherein the upper part adopts clay as a water-resisting layer 2, the lower part adopts sandstone as a heat reservoir 1, and a plurality of pressure sensors 7 are arranged in the sandstone and numbered;
(2) arranging a production well 4 and a recharge well 3 which penetrate through a water-resisting layer 2 and a thermal reservoir 1, wherein the distance between the production well and the recharge well is not less than 10m, and uniformly and equidistantly arranging water level monitoring wells 6 (outer walls 5 of the water-resisting layer) at the same layer between the production well 4 and the recharge well 3 and at the peripheries of the production well 4 and the recharge well 3; pressure water level meters are distributed in the production well 4, the recharge well 3 and the water level monitoring well 6; wherein a pressure sensor and a temperature sensor are arranged in the recharging well and the production well; all the pressure sensors, the pressure water level meters and the temperature sensors are connected to a computer through a data acquisition unit;
(3) configuring pumping equipment, recharging equipment and pipelines: the water pumping equipment is arranged in the production well, and the water supply pipeline is communicated with the water pumping equipment and distributed in the production well; the recharging pipeline is distributed in the recharging well, and the recharging equipment is used as water treatment equipment and is installed and connected between the water supply pipeline and the recharging pipeline;
(4) recording start-stop time and frequency of data by using a computer, starting a simulation test, filtering water pumped by a production well through a filter to form filtered water serving as a recharge water source, regulating flow rate in combination with water level change, recharging the filtered water into a recharge well, acquiring temperature change data of a thermal storage space in the recharge well at different time intervals through a temperature sensor, realizing real-time three-dimensional monitoring of temperature fields of the production well and the recharge well, and drawing a three-dimensional seepage field, a hydrodynamic field and a temperature field distribution diagram under a geothermal exploitation condition on the basis of COMSOL software (drawing by setting thermal reservoir parameters including rock particle size, porosity, permeability coefficient, permeability, elastic water release coefficient, exploitation well spacing and exploitation quantity parameters);
(5) the acquired temperature field monitoring data is combined with the water production and irrigation quantity and the dynamic characteristic data of the water level of the monitoring well, so that the geothermal water temperature field is monitored in real time in a three-dimensional mode, the temperature monitoring data of different spatial positions are acquired, the characteristic research requirements of the geothermal water production and irrigation temperature field are met, and the theoretical basis is provided for geothermal recharge research.
The working principle of the invention is as follows: and establishing a numerical model of the temperature field of the recharging heat reservoir under different recharging and extracting conditions by using the acquired monitoring data of the temperature field and combining the water yield of the recharging and extracting and the water level of the monitoring well, thereby providing scientific basis for reasonable well spacing and comprehensive layout research of the recharging and extracting project. The method breaks through the layout limitation of the actual mining and irrigation project, realizes the real-time three-dimensional monitoring of the geothermal water temperature field in the operation of the mining and irrigation project, obtains temperature monitoring data of different spatial positions, and greatly improves the precision of the monitoring data compared with the existing actual project or observation method. The requirement of researching the characteristics of the mining and irrigation temperature field is met, and a theoretical basis is provided for the research of geothermal recharging.
Claims (2)
1. A simulation test method for monitoring a geothermal recharge three-dimensional temperature field is characterized by comprising the following steps:
(1) laying a simulated sand tank, wherein the upper part adopts clay as a water-resisting layer, the lower part adopts sandstone as a heat reservoir, and a plurality of pressure sensors are arranged in the sandstone and numbered;
(2) arranging a production well and a recharge well which penetrate through a water-resisting layer and a thermal reservoir, wherein the distance between the production well and the recharge well is not less than 10m, and uniformly and equidistantly arranging water level monitoring wells at the same layer between the production well and the recharge well and at the peripheries of the production well and the recharge well; distributing pressure water level meters in the production well, the recharge well and the water level monitoring well, wherein pressure sensors and temperature sensors are arranged in the recharge well and the production well; all the pressure sensors, the pressure water level meters and the temperature sensors are connected to a computer through a data acquisition unit;
(3) configuring pumping equipment, recharging equipment and pipelines: the water pumping equipment is arranged in the production well, and the water supply pipeline is communicated with the water pumping equipment and distributed in the production well; the recharging pipeline is distributed in the recharging well, and the recharging equipment is used as water treatment equipment and is installed and connected between the water supply pipeline and the recharging pipeline;
(4) recording start-stop time and frequency of data by using a computer, starting a simulation test, filtering water pumped by a mining well through a filter to form filtered water serving as a recharging water source, regulating flow rate in combination with water level change, recharging the filtered water into a recharging well, acquiring temperature change data of a thermal storage space in the recharging well at different time intervals through a temperature sensor, realizing real-time three-dimensional monitoring of temperature fields of the mining well and the recharging well, and drawing a three-dimensional seepage field, a hydrodynamic field and a temperature field distribution diagram under a geothermal mining and recharging condition based on COMSOL software;
(5) the real-time three-dimensional monitoring of the geothermal water temperature field is realized by utilizing the acquired temperature field monitoring data and combining the water production and irrigation quantity and the dynamic characteristic data of the water level of the monitoring well, and the temperature monitoring data of different spatial positions are acquired.
2. The simulation test method for monitoring the geothermal recharge three-dimensional temperature field according to claim 1, wherein a plurality of pressure sensors are distributed in a grid shape in sandstone.
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| CN113216944A (en) * | 2021-04-27 | 2021-08-06 | 中国地质科学院水文地质环境地质研究所 | Device and method for researching influence factors of deep bed rock recharge |
| CN113446744A (en) * | 2021-06-15 | 2021-09-28 | 中国地质大学（武汉） | Geothermal reservoir production and irrigation simulation test system suitable for unconsolidated sandstone |
| CN113552649A (en) * | 2021-06-16 | 2021-10-26 | 山东大学 | Deep geothermal development geothermal field and displacement field comprehensive test model test system |
| CN114016992A (en) * | 2021-11-15 | 2022-02-08 | 吉林大学 | Well arrangement method suitable for large-scale hydrothermal geothermal resource exploitation |
| CN114017935A (en) * | 2021-09-16 | 2022-02-08 | 西安交通大学 | Method for determining distance between recharge well and pumping well based on double-hole and double-seepage model |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113216944A (en) * | 2021-04-27 | 2021-08-06 | 中国地质科学院水文地质环境地质研究所 | Device and method for researching influence factors of deep bed rock recharge |
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| CN114017935A (en) * | 2021-09-16 | 2022-02-08 | 西安交通大学 | Method for determining distance between recharge well and pumping well based on double-hole and double-seepage model |
| CN114016992A (en) * | 2021-11-15 | 2022-02-08 | 吉林大学 | Well arrangement method suitable for large-scale hydrothermal geothermal resource exploitation |
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