CN112541270B - Hot spring cause model based on fracture convection type geothermal system - Google Patents
Hot spring cause model based on fracture convection type geothermal system Download PDFInfo
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- CN112541270B CN112541270B CN202011477762.2A CN202011477762A CN112541270B CN 112541270 B CN112541270 B CN 112541270B CN 202011477762 A CN202011477762 A CN 202011477762A CN 112541270 B CN112541270 B CN 112541270B
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Abstract
The invention provides a hot spring cause model based on a fracture convection type geothermal system, which comprises a simulation tank body and a water supply tank, wherein a simulated multilayer geological structure model is arranged in the simulation tank body; a water guide pipe and a monitoring pipe are arranged in the geological structure model, and a plurality of temperature sensors are arranged in the monitoring pipe from top to bottom. A plurality of pressure sensors are arranged in the water guide pipe from top to bottom, and each temperature sensor and each pressure sensor are electrically connected with the acquisition device. Through adopting foretell scheme, can be convenient carry out the cause simulation to fracture convection type geothermal system hot spring, be convenient for gather corresponding data from this model, reduce data acquisition cost by a wide margin, can effectual supplementary application efficiency who improves geothermal system.
Description
Technical Field
The invention relates to the field of geothermal system simulation, in particular to a hot spring cause model based on a fracture convection type geothermal system.
Background
Geothermal energy is a very common geological phenomenon, and a large number of natural hot springs exist all over the country, wherein fracture convection type hot springs account for most of the natural hot springs and are good tourist resources. The reasons for the formation of fractured convective geothermal systems have been vague. It is necessary to find effective utilization of fractured convective geothermal resources through simulation studies. Chinese patent document CN 110886604A describes a high-efficiency geothermal resource exploration method based on computer simulation technology, which is based on real geothermal resources to perform exploration, can obtain relatively real data, and then perform simulation with a computer, but the cost of obtaining data in this scheme is too high. Therefore, a scheme for acquiring near-real data under different geological models needs to be found.
Disclosure of Invention
The invention aims to solve the technical problem of providing a fracture convection type geothermal system-based hot spring cause model which can truly simulate the hot spring cause of the fracture convection type geothermal system-based hot spring. In the preferred scheme, accurate data can be obtained for the time domain temperature distribution of the multilayer geological structure with different structures. Pressure distribution data of different elevations can be acquired.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a hot spring cause model based on a fracture convection type geothermal system comprises a simulation tank body and a water supply tank, wherein a simulated multilayer geological structure model is arranged in the simulation tank body, a water inlet layer is arranged at the bottom of the simulation tank body, the top of the water inlet layer is communicated with the multilayer geological structure model, the water inlet layer is communicated with the water supply tank through a water inlet pipe, the water inlet layer is also communicated with a gas inlet pipe, and the gas inlet pipe is used for providing steam;
a water guide pipe and a monitoring pipe are arranged in the geological structure model, and a plurality of temperature sensors are arranged in the monitoring pipe from top to bottom.
In a preferred scheme, the multilayer geological structure model is provided with one or more combinations of an original soil layer, a fine sand layer, a gravel layer, a sand layer and a clay layer, and the arrangement of each layer is set according to a site survey structure;
and a rock stratum is arranged at the bottom of the multilayer geological structure model, and a fracturing fracture formed after the rock stratum is fractured by adopting a pressure medium is arranged on the rock stratum.
In a preferred scheme, the monitoring pipe is a glass or metal pipe, a probe of the temperature sensor extends out of the side wall of the monitoring pipe, and the bottom of the monitoring pipe is in contact with the top of the rock stratum.
In a preferred scheme, a camera is further arranged in the monitoring pipe from top to bottom, and a lens of the camera extends out of the side wall of the monitoring pipe.
In a preferred embodiment, the monitoring tube is arranged substantially vertically.
In a preferable scheme, the monitoring pipes are in a plurality of numbers and are spirally distributed by taking the center of the simulation groove body as the center.
In a preferred scheme, the side wall of the aqueduct is provided with a plurality of through holes, and the bottom of the aqueduct is close to the rock stratum.
In a preferred scheme, a plurality of pressure sensors are arranged on the side wall of the water guide pipe from top to bottom.
In the preferred scheme, an overflow port is further arranged on the side wall, close to the top, of the simulation tank body, a circulating groove is arranged below the overflow port, and the circulating groove is connected with a water supply tank through a pipeline and a circulating pump.
In the preferred scheme, the temperature sensor and the camera are electrically connected with the acquisition device;
a plurality of pressure sensors are arranged in the water guide pipe from top to bottom, and each pressure sensor is electrically connected with the acquisition device.
The invention provides a hot spring cause model based on a fracture convection geothermal system, which can conveniently perform cause simulation on the hot spring of the fracture convection geothermal system by adopting the scheme, is convenient to acquire corresponding data from the model, greatly reduces the data acquisition cost and can effectively assist in improving the application efficiency of the geothermal system.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
fig. 1 is a schematic view of the overall structure of the present invention.
Figure 2 is a schematic top view of a simulated tank of the present invention.
FIG. 3 is a schematic diagram of the monitoring tube of the present invention.
Fig. 4 is a schematic structural view of a water guide duct of the present invention.
In the figure: the device comprises a simulation tank body 1, a water overflow port 2, a raw soil layer 3, a gravel layer 4, a monitoring pipe 5, a temperature sensor 51, a camera 52, a water guide pipe 6, a through hole 61, a pressure sensor 62, a water inlet layer 7, a water inlet pipe 8, an air inlet pipe 9, a water supply tank 10, a steam supply device 11, a collection device 12, a circulating groove 13, a fracturing fracture 14, a rock stratum 15 and a circulating pump 16.
Detailed Description
As shown in fig. 1, a hot spring cause model based on a fracture convection geothermal system comprises a simulation tank body 1 and a water supply tank 10, wherein a simulated multilayer geological structure model is arranged in the simulation tank body 1, a water inlet layer 7 is arranged at the bottom of the simulation tank body 1, the top of the water inlet layer 7 is communicated with the multilayer geological structure model, the water inlet layer 7 is communicated with the water supply tank 10 through a water inlet pipe 8, the water inlet layer 7 is also communicated with an air inlet pipe 9, and the air inlet pipe 9 is used for providing steam; wherein the temperature of the steam is set to be 200 to 250 ℃ so as to be approximately the same as the ground temperature of the geothermal system.
A water guide pipe 6 and a monitoring pipe 5 are arranged in the geological structure model, and a plurality of temperature sensors 51 are arranged in the monitoring pipe 5 from top to bottom. The arranged water guide pipe 6 can simulate a fracture gap in a geological structure, and the arranged monitoring pipe 5 and the temperature sensor 51 can accurately acquire temperature gradient distribution data in a multilayer geological structure model.
Preferably, as shown in fig. 1, the multilayer geologic structure model is provided with one or more of a combination of a primary soil layer 3, a fine sand layer, a gravel layer 4, a sand soil layer and a clay layer, and the arrangement of each layer is set according to a site survey structure;
by the structure, the accurate geological model of the hot spring planned development region can be conveniently simulated, and the auxiliary resource development is facilitated. In particular, the mutual relations of temperature, pressure and water in different geological structures can be conveniently obtained.
And a rock stratum 15 is arranged at the bottom of the multilayer geological structure model, and a fracturing fracture 14 formed after fracturing by adopting a pressure medium is arranged in the rock stratum. The rock stratum 15 is preferably granite, and a pressure medium is pressed into the rock stratum 15 under the pressure of 30-50 MPa to form a fracture 14 so as to simulate the underground rock stratum structure.
In a preferred embodiment, as shown in fig. 3, the monitoring tube 5 is a glass or metal tube, the probe of the temperature sensor 51 extends out of the side wall of the monitoring tube 5, and the bottom of the monitoring tube 5 contacts the top of the rock formation 15. With this structure, it is convenient to acquire the temperature distribution gradient from the bottom to the top.
In a preferred embodiment, as shown in fig. 3, a camera 52 is further disposed inside the monitoring tube 5 from top to bottom, and a lens of the camera 52 extends out of a sidewall of the monitoring tube 5. The structure is used for observing the rock-soil states under different geological structure models.
The preferred solution is as in fig. 1, where the monitoring tube 5 is arranged substantially vertically.
In a preferred scheme as shown in fig. 2, the monitoring tubes 5 are in a plurality and spirally distributed by taking the center of the simulated slot body 1 as the center. The structure is used for constructing the time domain temperature gradient change of the whole geological structure model, can reflect the hot spring cause data of the fracture convection geothermal system in a real way, and assists in the efficient development of the geothermal hot spring.
In a preferred embodiment, as shown in fig. 4, the side wall of the conduit 6 is provided with a plurality of through holes 61, and the bottom of the conduit 6 is close to the rock strata 15. The water guide pipe 6 is beneficial to simulating the cause of the hot spring in a smaller range.
In a preferred embodiment, as shown in fig. 4, a plurality of pressure sensors 62 are provided on the sidewall of the water conduit 6 from top to bottom. With the structure, pressure changes of different elevations can be detected conveniently. In a preferred embodiment, the height of the water level in the water service box 10 is adjusted to provide pressure changes at different elevations for different pressures to create a computer model closer to the true state.
Preferably, as shown in fig. 1, a spillway 2 is further provided on a side wall of the simulated tank body 1 near the top, a circulation tank 13 is provided below the spillway 2, and the circulation tank 13 is connected with the water supply tank 10 through a pipeline and a circulation pump 16. With the structure, the whole data model can be further improved through long-time circulation.
Preferably, as shown in fig. 1, the temperature sensor 51 and the camera 52 are electrically connected to the collecting device 12;
a plurality of pressure sensors 62 are provided in the water guide pipe 6 from the top to the bottom, and each pressure sensor 62 is electrically connected to the pickup device 12. The connection mode preferably adopts 485 or CAN bus.
During the use, with concrete construction simulation cell body 1, simulation cell body 1 bottom sets up the cavity and forms into water inlet layer 7, arranges inlet tube 8 and intake pipe 9 at water inlet layer 7, and water inlet layer 7 top sets up the baffle that permeates water. Preferably, the simulated tank body 1 adopts a 5 × 5 m square tank body, and the depth is 10 m. Taking a square rock stratum 15 with the thickness of about 2.5 meters and the thickness of 1-2 meters, drilling, connecting a fracturing pipe, plugging an orifice, injecting bentonite fracturing fluid with the pressure of 30-50 MPa, fracturing the rock stratum 15 to form a fracturing fracture 14, placing proper four rock stratums 15 in a simulation tank body 1, and separating the side surfaces of the rock stratums 15 by polymer mortar.
Filling different multilayer geological structures on the tops of the rock stratums 15, vertically separating the geological structures by concrete slabs, plastering mortar to seams, spirally arranging a plurality of monitoring pipes 5 by taking the vertical center of the rock stratums 15 as the center in the filling process, and arranging a plurality of temperature sensors 51 and cameras 52 in the monitoring pipes 5 from top to bottom; typically, the length of a single pipe 5 is monitored to be 6 meters, and a welded joint is required. A water conduit 6 is also arranged during the filling process, and a plurality of pressure sensors 62 are arranged on the water conduit 6 from top to bottom. The wiring of the temperature sensor 51, the camera 52 and the pressure sensor 62 is connected to the acquisition device 12. And data are acquired in a time-sharing mode during testing. Pour into water into the feed water tank 10, the fluorescence pigment is put into to preferred in the aquatic to detect, reliably be connected intake pipe 9 with steam supply unit 11, and the check is errorless the back, opens the gate valve of inlet tube 8 and intake pipe 9, and temperature sensor 51 detects the temperature gradient change, and derives the temperature conduction model in the different geological structure, and camera 52 detects the color variation of different positions, in order to derive the infiltration model of different positions. The water level height of the water service box 10 is adjusted and the pressure sensor 62 obtains models of pressure drops in different geological structures. And opening a gate valve of the overflow port 2 to overflow, and arranging a flow sensor on the overflow port 2 to obtain runoff models in different geological structures. The data collection based on the fracture convection type geothermal system hot spring cause model is realized through the steps, and the data collection is used for establishing a computer model to assist in developing the hot spring of the geothermal system.
The above-described embodiments are merely preferred technical solutions of the present invention, and should not be construed as limiting the present invention, and the embodiments and features in the embodiments in the present application may be arbitrarily combined with each other without conflict. The scope of the present invention is defined by the claims, and is intended to include equivalents of the features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (2)
1. A hot spring cause model based on a fracture convection type geothermal system is characterized in that: the water supply tank comprises a simulation tank body (1) and a water supply tank (10), wherein a simulated multilayer geological structure model is arranged in the simulation tank body (1), a water inlet layer (7) is arranged at the bottom of the simulation tank body (1), the top of the water inlet layer (7) is communicated with the multilayer geological structure model, the water inlet layer (7) is communicated with the water supply tank (10) through a water inlet pipe (8), the water inlet layer (7) is also communicated with an air inlet pipe (9), and the air inlet pipe (9) is used for providing steam;
a water guide pipe (6) and a monitoring pipe (5) are arranged in the geological structure model, and a plurality of temperature sensors (51) are arranged in the monitoring pipe (5) from top to bottom;
the multilayer geological structure model is provided with one or a combination of a plurality of original soil layers (3), fine sand layers, gravel layers (4), sand soil layers and clay layers, and the arrangement of each layer is arranged according to a site survey structure;
a rock stratum (15) is arranged at the bottom of the multilayer geological structure model, and a fracturing fracture (14) formed after fracturing by adopting a pressure medium is arranged on the rock stratum;
placing a plurality of rock stratums (15) in the simulation tank body (1), wherein the side surfaces of the rock stratums (15) are separated by polymer mortar;
filling different multilayer geological structures on the top of each rock stratum (15), vertically separating the geological structures by concrete plates, plastering mortar, and spirally arranging a plurality of monitoring pipes (5) by taking the vertical center of the rock stratum (15) as the center in the filling process;
the monitoring tube (5) is arranged substantially vertically;
the monitoring tube (5) is a glass or metal tube, a probe of the temperature sensor (51) extends out of the side wall of the monitoring tube (5), and the bottom of the monitoring tube (5) is in contact with the top of the rock stratum (15);
a camera (52) is further arranged in the monitoring tube (5) from top to bottom, and a lens of the camera (52) extends out of the side wall of the monitoring tube (5);
the side wall of the aqueduct (6) is provided with a plurality of through holes (61), and the bottom of the aqueduct (6) is close to the rock stratum (15);
a plurality of pressure sensors (62) are arranged on the side wall of the water guide pipe (6) from top to bottom;
an overflow opening (2) is further formed in the side wall, close to the top, of the simulation tank body (1), and a flow sensor is arranged on the overflow opening (2) and used for obtaining runoff models in different geological structures; a circulating groove (13) is arranged below the overflow gap (2), and the circulating groove (13) is connected with the water supply tank (10) through a pipeline and a circulating pump (16).
2. The model of claim 1, wherein the model is based on a fracture convection geothermal system hot spring cause model, and is characterized in that: the temperature sensor (51) and the camera (52) are electrically connected with the acquisition device (12);
each pressure sensor (62) is electrically connected to the acquisition device (12).
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| CN112541270B true CN112541270B (en) | 2023-02-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7178337B2 (en) * | 2004-12-23 | 2007-02-20 | Tassilo Pflanz | Power plant system for utilizing the heat energy of geothermal reservoirs |
| CN106677771B (en) * | 2016-11-28 | 2020-09-15 | 中国石油大学(华东) | Simulation experiment device for enhanced geothermal system and method for evaluating pore-type sandstone thermal storage reconstruction by using simulation experiment device |
| US11098575B2 (en) * | 2018-02-26 | 2021-08-24 | Exxonmobil Upstream Research Company | Method for flow profiling using active-source heating or cooling and temperature profiling |
| CN110886604B (en) * | 2019-12-02 | 2023-06-09 | 中国石油大学(华东) | Efficient geothermal resource investigation method based on computer simulation technology |
| CN111505732A (en) * | 2020-05-29 | 2020-08-07 | 中国华能集团清洁能源技术研究院有限公司 | Simulation system and method for simulating regional geothermal distribution by using equivalent temperature |
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