CN212722692U - System for measuring equivalent geothermal temperature - Google Patents
System for measuring equivalent geothermal temperature Download PDFInfo
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- CN212722692U CN212722692U CN202020958819.XU CN202020958819U CN212722692U CN 212722692 U CN212722692 U CN 212722692U CN 202020958819 U CN202020958819 U CN 202020958819U CN 212722692 U CN212722692 U CN 212722692U
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Abstract
The utility model provides a system for measuring equivalent geothermal temperature, which comprises an experiment box, a top heating device, a bottom heating device, a rock stratum column model, a temperature sensor, a temperature detector and a data workbench, wherein the top and the bottom of the inner cavity of the experiment box are respectively provided with the top heating device and the bottom heating device; a rock stratum column model is placed in the inner cavity of the experimental box; the rock stratum column model comprises a plurality of layers of lithologic heat-conducting plates which are arranged in a stacked mode in the vertical direction, and each layer of lithologic heat-conducting plate is provided with a temperature sensor; each temperature sensor is connected with a temperature detector; the temperature detector, the top heating device and the bottom heating device are all connected with the data workbench; the utility model discloses utilize simple and easy system relatively, can realize equivalent geothermal temperature accurate measurement relatively, have better popularization meaning in the geothermal exploration and development field.
Description
Technical Field
The utility model relates to a geothermal exploration technical field, in particular to measure system of equivalent geothermal temperature.
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. In areas with relatively low exploration degree and without direct thermal development conditions, technical means such as geological analysis and experimental testing are often needed to predict the local geothermal conditions in advance, so that the success rate of geothermal exploitation is improved, and more high-quality and more reliable geothermal resources are obtained. However, since the underground heat storage is often difficult to directly observe in the actual development process, a great deal of exploration and development cost is required to be invested if the new geothermal exploitation well drilling is directly implemented. Therefore, there is a need for a convenient and fast system that facilitates further clarification of local geothermal resource conditions in order to evaluate local geothermal resource conditions relatively accurately.
At present, no experimental equipment capable of directly predicting the condition of geothermal resources in a research area is formed, and numerical simulation means is generally adopted. However, in the process of carrying out the geothermal numerical simulation work, the reliability and the accuracy of the geothermal numerical simulation result are limited due to the lack of the temperature data of the deep rock stratum. The greater the depth, the closer to the geocentric, and the higher the corresponding temperature, so theoretically, numerical simulation from the geocentric depth is the closest to the actual situation. However, on one hand, the difficulty of data acquisition is too great, and on the other hand, it has no practical significance to carry out numerical simulation work with such great depth for a certain region. In fact, for a certain research area, the relatively homogeneous magma is often obtained under a certain depth, and at this depth level, the transverse temperature has no obvious difference, so that the shallow geothermal resource numerical simulation can be carried out by determining the equivalent temperature of the corresponding depth and on the basis of the equivalent temperature. In the case of less strict requirements, the depth may be determined to be around 10000 m.
Currently, researchers have relatively few studies on deep equivalent geothermal temperatures, let alone laboratory measurements thereof; if the experimental means is utilized to obtain the relatively accurate equivalent temperature, necessary basic data can be provided for developing reliable numerical simulation work. Therefore, it is necessary to form a set of experimental systems capable of measuring equivalent geothermal temperature to fill the research gap in this field.
Disclosure of Invention
An object of the utility model is to provide a measure system of equivalent geothermol power temperature, the problem that the reliability and the degree of accuracy are low of current geothermol power numerical simulation achievement has been solved.
In order to achieve the above purpose, the utility model discloses a technical scheme is:
the utility model provides a system for measuring equivalent geothermal temperature, which comprises an experiment box, a top heating device, a bottom heating device, a rock stratum column model, a temperature sensor, a temperature detector and a data workbench, wherein the top and the bottom of the inner cavity of the experiment box are respectively provided with the top heating device and the bottom heating device; a rock stratum column model is placed in the inner cavity of the experimental box; the rock stratum column model comprises a plurality of layers of lithologic heat-conducting plates which are arranged in a stacked mode in the vertical direction, and each layer of lithologic heat-conducting plate is provided with a temperature sensor; each temperature sensor is connected with a temperature detector; the temperature detector, the top heating device and the bottom heating device are all connected with the data workbench.
Preferably, a scale is arranged on the outer wall of the experiment box, and the thickness of each layer of lithologic heat conducting plate corresponds to the depth reading of the scale.
Preferably, the top heating device comprises a top heater and a top heating plate, wherein the top heating plate is fixed on the top of the experimental box, and the top heater is connected with the top heating plate.
Preferably, the bottom heating device comprises a bottom heater and a bottom heating plate, wherein the bottom heating plate is fixed at the bottom of the experimental box, and the bottom heater is connected with the bottom heating plate.
Preferably, the number of layers of the lithologic heat-conducting plate in the rock stratum column model corresponds to the number of layers of rock strata in the region of the research area; the thickness and the heat conductivity of each layer of lithologic heat conducting plate are consistent with those of the corresponding rock stratum in the research area.
Preferably, each layer of the lithologic heat-conducting plate is formed by overlapping a plurality of lithologic heat-conducting plate bodies.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a system for measuring equivalent geothermal temperature can establish simplified rock stratum column model and experimental model matched with real geothermal condition, and can lay the experimental foundation for further carrying out geothermal simulation work; obtaining equivalent geothermal temperature within a certain range through experiments, and providing necessary experimental conditions and basic data for regional numerical simulation; the utility model discloses utilize simple and easy system relatively, can realize equivalent geothermal temperature accurate measurement relatively, have better popularization meaning in the geothermal exploration and development field.
Drawings
Fig. 1 is a schematic flow chart of the present invention.
Fig. 2 is a schematic diagram of the system of the present invention.
Fig. 3 is the schematic diagram of the actually measured geothermal gradient curve and the experimental burial depth-temperature value of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 2, the utility model provides a system for measuring equivalent geothermal temperature, including experimental box 1, insulation material 2, scale 3, top heater 4, top heating plate 5, bottom heater 6, bottom heating plate 7, lithology heat-conducting plate 8, temperature-sensing ware 9, thermoscope 10, data transmission line 11 and data workstation 12, wherein, insulation material 2 has been laid on the inner wall of experimental box 1; and a scale 3 is arranged on the outer wall of the experimental box 1.
The inner chamber top of experimental box 1 is provided with top hot plate 5, top hot plate 5 is connected with top heater 4, through the cooperation of top heater 4 and top hot plate 5, realizes the heating to the top.
The inner chamber bottom of experimental box 1 is provided with bottom hot plate 7, bottom hot plate 7 is connected with bottom heater 6, through the cooperation of bottom heater 6 and bottom hot plate 7, realizes the heating to the bottom.
The inner cavity of the experimental box 1 is provided with a plurality of layers of lithologic heat-conducting plates 8, and the plurality of layers of lithologic heat-conducting plates 8 are arranged along the vertical direction of the experimental box 1.
The thickness in each layer of lithologic heat-conducting plate 8 corresponds to the depth reading of the scale 3.
A temperature sensor 9 is arranged on each layer of lithologic heat-conducting plate 8; each temperature sensor 9 is connected to a thermometer 10.
The temperature detector 10 is connected with a data workbench 12 through a data transmission line 11.
The data workbench 12 is used for acquiring temperature data of each temperature sensor and comparing the temperature data with a preset geothermal gradient curve.
The multiple layers of lithologic heat-conducting plates 8 form a rock stratum column model.
The thermal conductivity of each layer of lithologic heat-conducting plate 8 is consistent with the weighted thermal conductivity of the corresponding rock stratum in the region of the study area.
The experimental box 1 is in a vertical tubular shape, the size is preferably 20cm (diameter) multiplied by 120cm (height), the pipe wall is made of a material with good heat insulation performance, the material can bear the temperature change of 0-300 ℃ and the transverse pressure generated by the lithologic heat conducting strip 8, and the material does not deform obviously in the experimental process.
The heat insulation material 2 should be made of a material with good heat insulation performance and sealing performance, the thickness is preferably 2.5cm, and the heat insulation material should be closely attached to the wall of the experimental box 1.
The scale 3 is clear in number, the total length is more than 100cm, and the graduation is at least 5 cm; the 100cm scale position on the scale 3 should be level with the top surface of the bottom heating plate 7, and the 0cm scale should be level with the bottom surface of the top heating plate 5.
The top heater 4 is regulated and controlled stably within the temperature range of 0-30 ℃, the graduation is adjusted to be 1 ℃, and the bottom surface of the top heater is tightly attached to the top heating plate 5.
The top heating plate 5 should be made of a material with good heat conductivity, and the bottom surface of the top heating plate should be closely attached to the uppermost lithologic heat-conducting plate 8.
The bottom heater 6 should be regulated and controlled stably within the temperature range of 150-300 ℃, the graduation is adjusted to be 1 ℃, and the top surface of the bottom heater should be tightly attached to the bottom heating plate 7.
The bottom heating plate 7 should be made of a material with good heat conductivity, and the top surface of the bottom heating plate should be closely attached to the lowermost lithologic heat-conducting plate 8.
The lithologic heat conducting fin 8 should be prepared in advance, the size is preferably 15cm (diameter) × 5cm (height), the top/bottom sections of the heat conducting fin are flat and smooth and can be tightly attached to each other, and the heat conductivity coefficients can be respectively set to be 0.5/1.0/1.5/2.0/2.5/3.0/3.5/4.0/4.5/5.0/5.5/6.0/6.5/7.0W/(m.K).
The measuring range of the temperature detector 10 is-10-320 ℃, and the minimum scale is 1 ℃.
The data workbench 12 has basic functions of inputting actual burial depth-temperature values, automatically acquiring temperature values of the lithologic heat conducting fins 8 in the experiment box 1, drawing and comparing actual/experimental ground temperature gradient curves and the like.
Referring to fig. 1, the utility model discloses a measure equivalent geothermal temperature system's operating procedure does:
step 1, collecting regional structure and deposition data of a research area, and mainly collecting geothermal related data such as a geothermal gradient curve and the like.
Combining the structure and sedimentary geology of the research area, intensively collecting data and data related to geothermy in the geothermy well, including but not limited to the buried depth d of the top surface and the bottom surface of each rock stratum, the thickness h of the rock stratum, and the average thermal conductivity k of the rock stratumxSpecific heat capacity cxIn the buried depth-temperature curveCorresponding temperature T of each layer and surface temperature T0And the like. Wherein the average thermal conductivity k of the formationxAnd specific heat capacity cxA representative sample with good sealing performance is selected for measurement. The buried depth-temperature geothermal gradient curve should be a curve with a steadily increasing temperature from shallow to deep, and the local temperature change may be related to a large fluid influx, and is not representative of a region, so that the local temperature change should be deleted from the selected data.
And 2, constructing a rock stratum digital model by combining the regional geothermal geological conditions, selecting a proper lithologic heat conducting sheet 8, and constructing a rock stratum column model.
Based on the collected regional geothermal data, the data is obtained by 1:10000 size proportion of buried depth d and heat conductivity coefficient k of each actual stratumxThe data is generalized into a rock stratum digital model; and combining the obtained rock stratum digital model with the lithologic heat conduction plate (8) to build a rock stratum column model.
In the digital model, the thickness of the single-layer rock stratum is preferably a multiple of 5cm, and if the thickness of the single-layer rock stratum is too thin, the single-layer rock stratum can be treated in one of the following two ways:
the first method comprises the following steps: the corresponding single-layer lithologic heat conducting fin 8 is subjected to thickness segmentation, but the segmentation thickness is preferably an integral fraction of the original thickness, such as 2.5cm, 1.25cm and the like, and the segmentation section is polished to be smooth so that a rock stratum column model can be vertically built;
and the second method comprises the following steps: a plurality of adjacent thin layers are arranged according to the equivalent thermal conductivity coefficient kx' performing a conversion to merge a plurality of adjacent thin layers into one formation; then using a material having an equivalent thermal conductivity kxThe lithologic heat-conducting fins 8 of' are modeled.
Equivalent coefficient of thermal conductivity kxThe formula for calculation of' is:
kx’＝∑(kxi·hi)/∑hi
in the formula, kxiThe thermal conductivity of the ith stratum in the adjacent thin layer; h isiCorresponding to the thickness of the formation.
At the position where the actual measurement depth is deep, because the actual measurement depth is deep as the rock pulp rock, the heat conductivity coefficient of the shallow layer heat conduction plate in the model needs to be transited to the heat conductivity coefficient of the deep layer rock pulp rock; namely, the heat conductivity of the lithologic heat conducting fin 8 from the top to the bottom in the rock pillar model is gradually transited to be consistent with that of the magma, and the heat conductivity of the magma is preferably 6-7W/(m.K).
Finally, a 0-100cm rock stratum digital model can be established based on the principle, 20 lithologic heat conducting sheets 8 with corresponding heat conductivity coefficients are selected, and a rock stratum column solid model is built from top to bottom. If actual evidence shows that the equivalent depth is obviously less than 10000m deep, the depth of the model can be reduced and the number of the lithologic heat conducting fins 8 can be reduced according to actual conditions.
And 3, assembling the equivalent geothermal temperature measuring system, inputting geothermal data into a data workbench 12, putting the built rock stratum column model into the equivalent geothermal temperature measuring system, and aligning each lithologic heat conducting fin 8 and the scale 3 with the temperature sensor 9 strictly.
According to the system schematic (fig. 2), a bottom heater 6 and a bottom heating plate 7 are firstly placed at the bottom of the experimental box 1 which is fully covered with the heat insulating material 2, the bottom heater 6 is tightly contacted with the bottom heating plate 7, and the top surface of the bottom heating plate 7 is flush with the 100cm scale on the scale 3.
And secondly, putting the rock stratum column model built in the step 2 into the experiment box 1 from deep to shallow in sequence, and ensuring that each lithologic heat conducting fin 8 in the model is strictly corresponding to the integer scale on the scale 3, and all the lithologic heat conducting fins 8 are aligned up and down and are in tight contact with each other.
Then, the top heating plate 5 and the top heater 4 are further placed in sequence on top of the top litho-thermal conductive sheet 8, and the litho-thermal conductive sheet 8, the top heating plate 5 and the top heater 4 are ensured to be in close contact with each other.
And finally, uniformly inserting temperature sensors 9 and thermometers 10 into a preset drill hole on one side of the experimental box 1, wherein each temperature sensor 9 is required to extend into the lithologic heat conducting strip 8, and each thermometer 10 is connected with a data workbench 12 through a data transmission line 11.
And 4, starting the top heater 4 and the bottom heater 6 to the designed temperature, starting the data workbench 12 and the temperature detector 10, and observing the temperature data acquired by the data workbench 12 at any time.
The top heater 4 is started and the top is addedThe heater 4 is preset to the local surface temperature T0(ii) a Starting the bottom heater 6, presetting the temperature of the bottom heater 6 as a deep temperature, wherein the deep temperature is an estimated temperature at first and needs to be continuously debugged to an actual temperature through the following steps; the first setting may take 250 c into account and remain unchanged for a period of time. Starting the data workbench 12 and the temperature detector 10, and observing temperature data of each layer displayed on the data workbench 12 at any time; if the local temperature is too high, the heating is immediately stopped and the cause of the abnormality is checked, and the system can not be restarted until the cause of the abnormality is solved.
And 5, comparing the original geothermal gradient curve with the temperature data in each lithologic heat conducting fin 8, and adjusting the temperatures of the bottom heater 6 and the bottom heating plate 7 at any time until the original geothermal gradient curve is basically consistent with the new geothermal gradient curve.
The original ground temperature gradient curve and the temperature data of each lithologic heat conducting fin 8 corresponding to the model depth according to the proportion of 1:10000 are projected in the same coordinate system (figure 3). After the temperature of each temperature detector 10 is stable, observing the difference between the original ground temperature gradient curve and the experimental data, and adjusting by the following two ways:
the first method comprises the following steps: if the shallow experimental data and the original site temperature gradient curve are consistent in form but the overall temperature is different to a certain extent, the experimental data and the original site temperature gradient curve can be gradually close to each other by adjusting the bottom heater 6;
and the second method comprises the following steps: if the shallow experimental data and the in-situ temperature gradient curve have obvious difference in form and reflect that the shallow rock model and the actual stratum have larger entrance and exit, the combination mode of the rock pillar model and the lithologic heat conducting fins 8 is adjusted by resetting the equivalent heat conductivity coefficient of each rock and the like so as to enable the experimental data and the in-situ temperature gradient curve to be gradually close.
And 6, recording the final bottom layer temperature as the equivalent geothermal temperature, and simultaneously recording heat conduction characteristic data and temperature data of each layer to form an experimental geothermal gradient curve.
And (5) enabling the experimental data to be basically consistent with the in-situ temperature gradient data in two ways in the step 5. According to the final arrangement condition of the lithologic heat-conducting fins 8, the best performance is recordedA thermal conductivity-depth combination reflecting the local lithologic thermal conductivity. After all the temperatures are stable, drawing an experimental geothermal gradient curve of 0-10000 m according to experimental conditions, and recording the final bottom temperature, namely the equivalent geothermal temperature Teq。
And 7, sequentially disassembling the top heater 4, the bottom heater 6, the thermometer 10, the temperature sensor 9 and the data workbench 12, and recycling the experimental system and each experimental part for the next use.
After the experiment was completed, the top heater 4 and the bottom heater 6 were turned off, and the system was allowed to cool gradually. After the data workbench 12 displays that the temperature in the experiment box 1 is lower than 20 ℃, the experiment box 1 is opened, the temperature detector 10 and the temperature sensor 9 are sequentially taken out, the top heater 4, the top heating plate 5, the lithology heat-conducting plate 8, the bottom heating plate 7 and the bottom heater 6 are gradually taken out from top to bottom, the data workbench 12 is closed, and the lithology heat-conducting plates 8 are orderly arranged for next use.
The utility model can establish a simplified rock stratum and temperature model matched with the real geothermal condition, and can lay the experimental foundation for further carrying out geothermal simulation work; meanwhile, the equivalent geothermal temperature in a certain range can be obtained through experiments, and necessary experimental conditions and basic data are provided for regional numerical simulation. The utility model discloses utilize simple and easy system relatively, can realize equivalent geothermal temperature accurate measurement relatively, have better popularization meaning in the geothermal exploration and development field.
The above description, which is only the specific embodiment of the present invention, can not limit the scope of the utility model, so that the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should still belong to the scope covered by the present invention.
Claims (6)
1. The system for measuring the equivalent geothermal temperature is characterized by comprising an experiment box (1), a top heating device, a bottom heating device, a rock stratum column model, a temperature sensor (9), a temperature detector (10) and a data workbench (12), wherein the top and the bottom of an inner cavity of the experiment box (1) are respectively provided with the top heating device and the bottom heating device; a rock stratum column model is placed in the inner cavity of the experimental box (1); the rock stratum column model comprises a plurality of layers of lithologic heat-conducting plates (8), the plurality of layers of lithologic heat-conducting plates (8) are arranged in a stacked mode in the vertical direction, and a temperature sensor (9) is arranged in each layer of lithologic heat-conducting plate (8); each temperature sensor (9) is connected with a temperature detector (10); the temperature detector (10), the top heating device and the bottom heating device are all connected with the data workbench (12).
2. A system for measuring equivalent geothermal temperature according to claim 1, characterised in that the outer wall of the experimental box (1) is provided with a scale (3), and the thickness of each layer of lithologic heat-conducting plate (8) corresponds to the depth indication of the scale (3).
3. A system for measuring geothermal equivalent temperature according to claim 1, characterised in that the top heating means comprises a top heater (4) and a top heating plate (5), wherein the top heating plate (5) is fixed on top of the experimental box (1) and the top heater (4) and the top heating plate (5) are connected.
4. A system for measuring geothermal equivalent temperature according to claim 1, characterised in that the bottom heating means comprises a bottom heater (6) and a bottom heating plate (7), wherein the bottom heating plate (7) is fixed to the bottom of the experimental box (1) and the bottom heater (6) and the bottom heating plate (7) are connected.
5. The system for measuring equivalent geothermal temperature according to claim 1, wherein the number of lithologic heat-conducting plates (8) in the rock formation column model corresponds to the number of rock formation layers in the region of study; the thickness and the heat conductivity coefficient of each layer of lithologic heat-conducting plate (8) are consistent with those of the corresponding rock stratum in the region of the research area.
6. A system for measuring equivalent geothermal temperature according to claim 1, characterised in that each layer of lithologic heat-conducting plate (8) is composed of a plurality of stacked lithologic heat-conducting plate bodies.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021239152A1 (en) * | 2020-05-29 | 2021-12-02 | 中国华能集团清洁能源技术研究院有限公司 | System and method for measuring equivalent geothermal temperature |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021239152A1 (en) * | 2020-05-29 | 2021-12-02 | 中国华能集团清洁能源技术研究院有限公司 | System and method for measuring equivalent geothermal temperature |
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