CN113341818A - System and method for monitoring geothermal energy of middle and deep layers - Google Patents
System and method for monitoring geothermal energy of middle and deep layers Download PDFInfo
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- CN113341818A CN113341818A CN202110664596.5A CN202110664596A CN113341818A CN 113341818 A CN113341818 A CN 113341818A CN 202110664596 A CN202110664596 A CN 202110664596A CN 113341818 A CN113341818 A CN 113341818A
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Abstract
The invention discloses a middle-deep geothermal monitoring system, which comprises an annular heat exchange tube, a circulating pump, a temperature measuring device and a monitoring terminal device, wherein the annular heat exchange tube is connected with the circulating pump; the annular heat exchange tube comprises an outer tube and an inner tube; an annular pipeline is formed between the outer side wall of the inner pipe and the inner side wall of the outer pipe; injecting a flowing medium into the annular pipeline from the upper opening of the outer pipe; the circulating pump drives a flowing medium to flow in the annular heat exchange pipe; the temperature measuring device circularly flows in the annular heat exchange tube along with the flowing medium, and continuously measures and records geothermal temperature information; and sending the geothermal temperature information to a monitoring terminal device. In addition, a middle-deep geothermal monitoring method is also disclosed. The geothermal well pipe temperature monitoring system has the advantages that the temperature measuring device arranged in the annular heat exchange pipe is used for continuously collecting the temperature information of the annular heat exchange pipe at different positions, meanwhile, the water level measuring device arranged at the pipe orifice of the geothermal well can detect the water level information of geothermal water in the geothermal well pipe in real time, and the accurate, rapid and comprehensive geothermal information monitoring is realized.
Description
Technical Field
The invention relates to the technical field of geothermal energy monitoring, in particular to a system and a method for monitoring geothermal energy in a middle-deep layer.
Background
The utilization of geothermal resources is an important energy-saving technology, particularly the development and utilization of the geothermal energy in the middle and deep layers are paid more and more attention, and the technology of utilizing a heat exchanger in the geothermal well in the middle and deep layers to exchange the geothermal energy in the middle and deep layers for heat supply without directly exploiting underground water resources becomes an important clean energy heat supply technology for the development and utilization of the geothermal energy in the middle and deep layers. Meanwhile, in the development and utilization of geothermal resources, the measurement method of the water level and the water temperature of the geothermal well is relatively lagged. For example, in the currently common method for manually measuring the water level, a probe connected with a lead at one side is utilized to sink along a well measuring pipe or a shaft to contact the water level, the other end of the lead is connected with an ammeter, the ammeter is connected when the metal probe contacts the water level, and then the depth of the geothermal water level is obtained by measuring the length of the lead; although the method is simple to operate, a large amount of manpower is required to be consumed, and the method cannot be used for measurement in severe weather; other commonly used water level measuring methods include: the pressure sensor is fixed under the well, the pressure signal is transmitted to a ground receiving instrument through a wire, and the dynamic and static water levels of the geothermal well are calculated according to the pressure signal, although the problem of manual field measurement is solved, the probe needs to be placed in geothermal water for a long time, so that the requirements on temperature resistance, corrosion resistance, sealing, magnetic field interference resistance and the like of the probe are high, and the price is high; the method does not need to place a probe underground, but most well heads are not ideal in sealing, gas leakage is very quick, gas cylinders need to be replaced frequently, maintenance is difficult, and when well head equipment maintenance is needed, the gas charging pipe needs to be disassembled, so that the working time of the lifting pump and the descending pump is greatly prolonged and is difficult to accept. In addition, the existing measurement of the geothermal temperature usually comprises the steps of pumping underground water to the ground surface, then measuring and recording the underground water into a system, compared with a manual measurement method, the labor cost is greatly reduced, but the measurement efficiency is low, heat loss is inevitably caused in the underground water pumping process, the water temperature measurement deviation is large, and accurate information of the underground water temperature cannot be controlled in real time.
Disclosure of Invention
Based on the above, in order to solve the technical problems in the prior art, a mid-deep geothermal monitoring system is particularly provided, which comprises an annular heat exchange tube, a circulating pump, a temperature measuring device and a monitoring terminal device;
the annular heat exchange tube comprises an outer tube and an inner tube; the inner pipe is positioned in the outer pipe, and the lower opening of the inner pipe is higher than that of the outer pipe; an annular pipeline is formed between the outer side wall of the inner pipe and the inner side wall of the outer pipe;
injecting a flowing medium into the annular pipeline from an upper opening of the outer pipe; the circulating pump is used for driving the flowing medium to flow in the annular heat exchange pipe; the injected flowing medium flows downwards in the annular pipeline and absorbs geothermal energy through the outer pipe in the downward flowing process, and the geothermal energy causes the temperature of the flowing medium to rise; driven by the circulating pump, the flowing medium flows downwards from the outer pipe to reach the bottom of the annular pipeline, then enters the inner pipe to continuously flow upwards and finally flows out of the inner pipe, so that a heat source is provided for a heating system on the ground; the flowing medium is re-injected into the annular pipeline after being cooled;
a temperature measuring device is arranged in the annular heat exchange tube; the temperature measuring device circularly flows in the annular heat exchange tube along with the flowing medium, and continuously measures and records geothermal temperature information; the temperature measuring device comprises a temperature sensor, a position sensor, a first microprocessor and a first wireless communication interface; the temperature sensor and the position sensor are respectively connected to the first microprocessor, and the first microprocessor is connected to the first wireless communication interface;
when the temperature measuring device is positioned at the opening at the upper side of the outer pipe, measuring and recording geothermal temperature information; in the process that the temperature measuring device flows from top to bottom in the annular pipeline and from bottom to top in the inner pipe, the temperature sensor continuously measures a temperature value and transmits the temperature value to the first microprocessor, the position sensor continuously acquires corresponding position information and transmits the position information to the first microprocessor, and the first microprocessor correspondingly records the temperature value and the position information and generates geothermal temperature information; when one circulation flow is finished, namely the temperature measuring device reaches the opening at the upper side of the inner pipe, the first microprocessor transmits the geothermal temperature information to the first wireless communication interface, and the information is sent to the monitoring terminal device through the first wireless communication interface, and the monitoring terminal device monitors the geothermal temperature.
In one embodiment, the medium-deep geothermal monitoring system further comprises a geothermal well pipe, wherein the annular heat exchange pipe is arranged in the geothermal well pipe and is immersed in geothermal water in the geothermal well pipe; the injected flowing medium flows in the annular pipeline, and absorbs geothermal energy from geothermal water of a geothermal well pipe in which the flowing medium is positioned through the outer pipe in the flowing process, wherein the geothermal energy causes the temperature of the flowing medium to rise.
In one embodiment, the mid-deep geothermal monitoring system further comprises a water level measuring device; the pipe orifice of the geothermal well pipe is provided with the water level measuring device, and the water level measuring device comprises an ultrasonic liquid level sensor, a second wireless communication interface and a second microprocessor; the ultrasonic liquid level sensor is connected to the second microprocessor, and the second microprocessor is connected to the second wireless communication interface; the ultrasonic liquid level sensor collects the water level information of geothermal water in a geothermal well pipe in real time and transmits the water level information to the second microprocessor; the second microprocessor records the water level information and transmits the water level information to the second wireless communication interface, the second wireless communication interface sends the water level information to the monitoring terminal device, and the monitoring terminal device monitors the water level in the middle-deep geothermal well.
In one embodiment, the annular heat exchange tube is disposed in a subsurface hot dry rock formation, and the flowing medium flows in the annular tube; the upper half part of the outer side wall of the outer pipe is surrounded and wrapped by an upper side cementing layer; the lower half part and the lower side opening of the outer side wall of the outer pipe are surrounded and wrapped by a lower side well cementation layer; the heat conductivity coefficient of the upper well cementation layer is smaller than that of the lower well cementation layer; the flowing medium absorbs geothermal energy from the dry heat rock stratum in which the flowing medium is located through the pipe wall of the outer pipe, the upper well cementation layer and the lower well cementation layer in the downward flowing process, and the temperature of the flowing medium is increased due to the geothermal energy.
In one embodiment, the temperature measuring device has a closed housing, the position sensor, the first microprocessor, and the first wireless communication interface are disposed in the closed housing, the temperature sensor is a thermistor wire, and the thermistor wire is wound around the closed housing;
the temperature measuring device further comprises a power supply for supplying power to the temperature measuring device, and the power supply is a high-temperature-resistant lithium battery.
In one embodiment, the flowing medium is water or a glycol solution.
In addition, the invention also discloses a middle-deep geothermal monitoring method, which comprises the following steps:
an outer pipe and an inner pipe are arranged in the annular heat exchange pipe; the inner pipe is arranged in the outer pipe, and the lower opening of the inner pipe is higher than that of the outer pipe; an annular pipeline is formed between the outer side wall of the inner pipe and the inner side wall of the outer pipe;
injecting a flowing medium into the annular pipeline from an upper opening of the outer pipe; the circulating pump drives the flowing medium to flow in the annular heat exchange pipe; the flowing medium flows downwards in the annular pipeline after being injected, and absorbs geothermal energy through the outer pipe in the downward flowing process, and the temperature of the flowing medium is increased due to the geothermal energy;
the flowing medium flows downwards from the outer pipe to the bottom of the annular pipeline under the driving of the circulating pump, then enters the inner pipe to continuously flow upwards and finally flows out of the inner pipe, so that a heat source is provided for a heating system on the ground; the flowing medium is re-injected into the annular pipeline after being cooled;
meanwhile, a temperature measuring device is arranged in the annular heat exchange tube; the temperature measuring device flows in the annular heat exchange tube along with the flowing medium in a circulating mode, and continuously measures and records geothermal temperature information; the temperature measuring device is provided with a temperature sensor, a position sensor, a first microprocessor and a first wireless communication interface;
when the temperature measuring device is positioned at the opening at the upper side of the outer pipe, the temperature measuring device starts to measure and record geothermal temperature information; in the process that the temperature measuring device flows from top to bottom in the annular pipeline and from bottom to top in the inner pipe, the temperature sensor continuously measures temperature values and transmits the temperature values to the first microprocessor connected with the temperature sensor, the position sensor continuously acquires corresponding position information and transmits the position information to the first microprocessor connected with the position sensor, and the first microprocessor correspondingly records the temperature values and the position information and generates geothermal temperature information; when one circulation flow is finished, namely the temperature measuring device reaches the opening at the upper side of the inner pipe, the first microprocessor transmits the geothermal temperature information to a first wireless communication interface connected with the first microprocessor, the geothermal temperature information is sent to the monitoring terminal device through the first wireless communication interface, and the monitoring terminal device monitors the geothermal temperature;
in one embodiment, the annular heat exchange tube is arranged in a geothermal well pipe and is immersed in geothermal water in the geothermal well pipe; the injected flowing medium flows in the annular pipeline, and absorbs geothermal energy from geothermal water of a geothermal well pipe in which the flowing medium is positioned through the outer pipe in the flowing process, wherein the geothermal energy causes the temperature of the flowing medium to rise.
In one embodiment, the water level measuring device is arranged at the pipe orifice of the geothermal well pipe and comprises an ultrasonic liquid level sensor, a second wireless communication interface and a second microprocessor; the ultrasonic liquid level sensor is connected to the second microprocessor, and the second microprocessor is connected to the second wireless communication interface; the ultrasonic liquid level sensor collects the water level information of geothermal water in a geothermal well pipe in real time and transmits the water level information to the second microprocessor; the second microprocessor records the water level information and transmits the water level information to the second wireless communication interface, the second wireless communication interface sends the water level information to the monitoring terminal device, and the monitoring terminal device monitors the water level in the middle-deep geothermal well.
In one embodiment, the annular heat exchange tube is disposed in a subterranean hot and dry rock formation, the flowing medium flowing in the annular tube; the upper half part of the outer side wall of the outer pipe is surrounded and wrapped by an upper side cementing layer; the lower half part and the lower side opening of the outer side wall of the outer pipe are surrounded and wrapped by a lower side well cementation layer; the heat conductivity coefficient of the upper well cementation layer is smaller than that of the lower well cementation layer; the flowing medium absorbs geothermal energy from the dry heat rock stratum in which the flowing medium is located through the pipe wall of the outer pipe, the upper well cementation layer and the lower well cementation layer in the downward flowing process, and the temperature of the flowing medium is increased due to the geothermal energy.
The embodiment of the invention has the following beneficial effects:
the middle-deep geothermal monitoring system disclosed by the invention can be applied to a middle-deep geothermal well or directly arranged in a dry-hot rock stratum to monitor middle-deep geothermal information; the temperature measuring device arranged in the annular heat exchange tube can circularly flow along with a flowing medium for heat exchange in the annular heat exchange tube, continuously collects temperature information of the temperature measuring device at different positions in the annular heat exchange tube and comprehensively records temperature data in the heat exchange process; meanwhile, the water level measuring device arranged at the pipe orifice of the geothermal well can detect the water level information of geothermal water in the geothermal well pipe in real time, and the invention realizes accurate, rapid and comprehensive monitoring of geothermal information.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Wherein:
FIG. 1 is a schematic view of an embodiment of a deep geothermal monitoring system according to the invention;
FIG. 2 is a schematic diagram of a second embodiment of a deep geothermal monitoring system according to the invention;
the system comprises an annular heat exchange tube 1, a temperature measuring device 2, a circulating pump 3, an inner tube 11, an outer tube 12, a water level measuring device 4, a geothermal well pipe 5, an upper well cementation layer 6 and a lower well cementation layer 7.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a middle-deep geothermal monitoring system which can monitor the temperature and the water level of a middle-deep geothermal well in real time;
in one embodiment, as shown in fig. 1, the mid-deep geothermal monitoring system comprises a geothermal well pipe, an annular heat exchange pipe, a circulating pump, a temperature measuring device and a monitoring terminal device;
the annular heat exchange pipe is arranged in the geothermal well pipe and is immersed in geothermal water in the geothermal well pipe; the annular heat exchange tube comprises an outer tube and an inner tube; the inner pipe is positioned in the outer pipe, and the lower opening of the inner pipe is higher than that of the outer pipe; an annular pipeline is formed between the outer side wall of the inner pipe and the inner side wall of the outer pipe;
injecting a flowing medium into the annular pipeline from an upper opening of the outer pipe; the circulating pump is used for driving the flowing medium to flow in the annular heat exchange pipe; the injected flowing medium flows downwards in the annular pipeline and absorbs geothermal energy from geothermal water of a geothermal well pipe in which the flowing medium is positioned through the outer pipe in the downward flowing process, and the temperature of the flowing medium is increased by the geothermal energy; under the action of the circulating pump, the flowing medium flows downwards from the outer pipe to reach the bottom of the annular pipeline, then enters the inner pipe to continuously flow upwards and finally flows out of the inner pipe, so that a heat source is provided for a heating system on the ground;
the flowing medium is reinjected into an annular pipeline formed between the inner pipe and the outer pipe after being cooled to flow downwards and absorb geothermal energy in geothermal water again, and the reciprocating circulation provides a continuous and stable heat source for a heating system on the ground, so that the geothermal energy of a middle-deep layer is extracted while underground hot water is not extracted;
a temperature measuring device is arranged in the annular heat exchange tube; the temperature measuring device flows in the annular heat exchange tube along with the flowing medium in a circulating mode, and continuously measures and records geothermal temperature information; the temperature measuring device comprises a temperature sensor, a position sensor, a first microprocessor and a first wireless communication interface; the temperature sensor and the position sensor are respectively connected to the first microprocessor, and the first microprocessor is connected to the first wireless communication interface;
when the temperature measuring device is positioned at an opening on the upper side of the outer pipe of the annular heat exchange pipe, measuring and recording geothermal temperature information; in the process that the temperature measuring device flows from top to bottom in the annular pipeline and from bottom to top in the inner pipe, the temperature sensor continuously measures a temperature value and transmits the temperature value to the first microprocessor, the position sensor continuously acquires corresponding position information and transmits the position information to the first microprocessor, and the first microprocessor correspondingly records the temperature value and the position information and generates geothermal temperature information; when one circulation flow is finished, namely the temperature measuring device reaches the opening at the upper side of the inner pipe, the first microprocessor transmits the geothermal temperature information to a first wireless communication interface, and the information is sent to the monitoring terminal device through the first wireless communication interface, and the monitoring terminal device monitors the geothermal temperature; after the current circulation flow is finished, the temperature measuring device is put into the annular pipeline again to measure the geothermal temperature information next time;
particularly, the temperature measuring device is provided with a closed shell, the position sensor, the first microprocessor and the first wireless communication interface are arranged in the closed shell, the temperature sensor is a thermistor wire, and the thermistor wire is wound on the closed shell;
particularly, the temperature measuring device further comprises a power supply for supplying power to the temperature measuring device, wherein the power supply is a high-temperature-resistant lithium battery, and the temperature-resistant upper limit value of the high-temperature-resistant lithium battery is 150 ℃; the temperature measuring device is soaked in a flowing medium for a long time, and if a common battery is in a high-temperature environment for a long time, the service life of the common battery is shortened, so that a high-temperature-resistant lithium battery with the temperature resistance upper limit of 150 ℃ is selected in consideration of the temperature resistance of the lithium battery;
the middle-deep geothermal monitoring system also comprises a water level measuring device; a pipe orifice of the geothermal well pipe is provided with a water level measuring device, and the water level measuring device comprises an ultrasonic liquid level sensor, a second wireless communication interface and a second microprocessor; the ultrasonic liquid level sensor is connected to the second microprocessor, and the second microprocessor is connected to the second wireless communication interface; the ultrasonic liquid level sensor collects the water level information of geothermal water in a geothermal well pipe in real time and transmits the water level information to the second microprocessor; the second microprocessor records the water level information and transmits the water level information to the second wireless communication interface, the second wireless communication interface sends the water level information to the monitoring terminal device, and the monitoring terminal device monitors the water level in the middle-deep geothermal well;
in another embodiment, as shown in fig. 2, the annular heat exchange tube is disposed in a dry hot subterranean formation, and the flowing medium flows in an annular conduit formed between the inner tube and the outer tube; the upper half part of the outer side wall of the outer pipe is surrounded and wrapped by an upper side cementing layer; the lower half part and the lower side opening of the outer side wall of the outer pipe are surrounded and wrapped by a lower side well cementation layer; the heat conductivity coefficient of the upper well cementation layer is smaller than that of the lower well cementation layer;
the flowing medium absorbs geothermal energy from the dry-hot rock stratum in which the flowing medium is positioned through the pipe wall of the outer pipe, the upper well cementation layer and the lower well cementation layer in the downward flowing process, so that the temperature of the flowing medium is continuously increased; the flowing medium flows downwards from the outer pipe to the bottom of the annular pipeline, then enters the inner pipe to continuously flow upwards and finally flows out of the inner pipe, so that a heat source is provided for a heating system on the ground;
the flowing medium is re-injected into an annular pipeline formed between the inner pipe and the outer pipe after being cooled to flow downwards, absorbs geothermal energy of the dry-hot rock stratum again, provides a continuous and stable heat source for a heating system on the ground in a reciprocating circulation mode, extracts geothermal energy of a middle-deep layer while extracting no underground water, and realizes sustainable development and utilization of geothermal resources of the middle-deep layer;
in particular, the flowing medium is water or a glycol solution.
In addition, the invention discloses a middle-deep geothermal monitoring method, which comprises the following steps:
an outer pipe and an inner pipe are arranged in the annular heat exchange pipe; the inner pipe is arranged in the outer pipe, and the lower opening of the inner pipe is higher than that of the outer pipe; an annular pipeline is formed between the outer side wall of the inner pipe and the inner side wall of the outer pipe;
injecting a flowing medium into the annular pipeline from an upper opening of the outer pipe; the circulating pump drives the flowing medium to flow in the annular heat exchange pipe; the flowing medium flows downwards in the annular pipeline after being injected, and absorbs geothermal energy through the outer pipe in the downward flowing process, and the temperature of the flowing medium is increased due to the geothermal energy;
the flowing medium flows downwards from the outer pipe to the bottom of the annular pipeline under the driving of the circulating pump, then enters the inner pipe to continuously flow upwards and finally flows out of the inner pipe, so that a heat source is provided for a heating system on the ground; the flowing medium is re-injected into the annular pipeline after being cooled;
meanwhile, a temperature measuring device is arranged in the annular heat exchange tube; the temperature measuring device flows in the annular heat exchange tube along with the flowing medium in a circulating mode, and continuously measures and records geothermal temperature information; the temperature measuring device is provided with a temperature sensor, a position sensor, a first microprocessor and a first wireless communication interface;
when the temperature measuring device is positioned at the opening at the upper side of the outer pipe, the temperature measuring device starts to measure and record geothermal temperature information; in the process that the temperature measuring device flows from top to bottom in the annular pipeline and from bottom to top in the inner pipe, the temperature sensor continuously measures temperature values and transmits the temperature values to the first microprocessor connected with the temperature sensor, the position sensor continuously acquires corresponding position information and transmits the position information to the first microprocessor connected with the position sensor, and the first microprocessor correspondingly records the temperature values and the position information and generates geothermal temperature information; when one circulation flow is finished, namely the temperature measuring device reaches the opening at the upper side of the inner pipe, the first microprocessor transmits the geothermal temperature information to a first wireless communication interface connected with the first microprocessor, the geothermal temperature information is sent to the monitoring terminal device through the first wireless communication interface, and the monitoring terminal device monitors the geothermal temperature; after the current circulation flow is finished, the temperature measuring device is put into the annular pipeline again to measure the geothermal temperature information next time;
in one embodiment, the annular heat exchange tube is arranged in a geothermal well pipe and is immersed in geothermal water in the geothermal well pipe; the injected flowing medium flows in the annular pipeline, and absorbs geothermal energy from geothermal water of a geothermal well pipe in which the flowing medium is positioned through the outer pipe in the flowing process, wherein the geothermal energy causes the temperature of the flowing medium to rise;
the pipe orifice of the geothermal well pipe is provided with the water level measuring device, and the water level measuring device comprises an ultrasonic liquid level sensor, a second wireless communication interface and a second microprocessor; the ultrasonic liquid level sensor is connected to the second microprocessor, and the second microprocessor is connected to the second wireless communication interface; the ultrasonic liquid level sensor collects the water level information of geothermal water in a geothermal well pipe in real time and transmits the water level information to the second microprocessor; the second microprocessor records the water level information and transmits the water level information to the second wireless communication interface, the second wireless communication interface sends the water level information to the monitoring terminal device, and the monitoring terminal device monitors the water level in the middle-deep geothermal well.
In another embodiment, the annular heat exchange tube is disposed in a subterranean hot and dry rock formation, the flowing medium flowing in the annular tube; the upper half part of the outer side wall of the outer pipe is surrounded and wrapped by an upper side cementing layer; the lower half part and the lower side opening of the outer side wall of the outer pipe are surrounded and wrapped by a lower side well cementation layer; the heat conductivity coefficient of the upper well cementation layer is smaller than that of the lower well cementation layer; the flowing medium absorbs geothermal energy from the dry heat rock stratum in which the flowing medium is located through the pipe wall of the outer pipe, the upper well cementation layer and the lower well cementation layer in the downward flowing process, and the temperature of the flowing medium is increased due to the geothermal energy.
Wherein the flowing medium is water or glycol solution.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. A middle-deep geothermal monitoring system is characterized by comprising an annular heat exchange tube, a circulating pump, a temperature measuring device and a monitoring terminal device;
the annular heat exchange tube comprises an outer tube and an inner tube; the inner pipe is positioned in the outer pipe, and the lower opening of the inner pipe is higher than that of the outer pipe; an annular pipeline is formed between the outer side wall of the inner pipe and the inner side wall of the outer pipe;
injecting a flowing medium into the annular pipeline from an upper opening of the outer pipe; the circulating pump is used for driving the flowing medium to flow in the annular heat exchange pipe; the injected flowing medium flows downwards in the annular pipeline and absorbs geothermal energy through the outer pipe in the downward flowing process, and the geothermal energy causes the temperature of the flowing medium to rise; driven by the circulating pump, the flowing medium flows downwards from the outer pipe to reach the bottom of the annular pipeline, then enters the inner pipe to continuously flow upwards and finally flows out of the inner pipe, so that a heat source is provided for a heating system on the ground; the flowing medium is re-injected into the annular pipeline after being cooled;
a temperature measuring device is arranged in the annular heat exchange tube; the temperature measuring device flows in the annular heat exchange tube along with the flowing medium in a circulating mode, and continuously measures and records geothermal temperature information; the temperature measuring device comprises a temperature sensor, a position sensor, a first microprocessor and a first wireless communication interface; the temperature sensor and the position sensor are respectively connected to the first microprocessor, and the first microprocessor is connected to the first wireless communication interface;
when the temperature measuring device is positioned at the opening at the upper side of the outer pipe, measuring and recording geothermal temperature information; in the process that the temperature measuring device flows from top to bottom in the annular pipeline and from bottom to top in the inner pipe, the temperature sensor continuously measures a temperature value and transmits the temperature value to the first microprocessor, the position sensor continuously acquires corresponding position information and transmits the position information to the first microprocessor, and the first microprocessor correspondingly records the temperature value and the position information and generates geothermal temperature information; when one circulation flow is finished, namely the temperature measuring device reaches the opening at the upper side of the inner pipe, the first microprocessor transmits the geothermal temperature information to the first wireless communication interface, and the information is sent to the monitoring terminal device through the first wireless communication interface, and the monitoring terminal device monitors the geothermal temperature.
2. The system for monitoring geothermal energy at a medium depth of claim 1,
the medium-deep geothermal monitoring system also comprises a geothermal well pipe, wherein the annular heat exchange pipe is arranged in the geothermal well pipe and is immersed in geothermal water in the geothermal well pipe; the injected flowing medium flows in the annular pipeline, and absorbs geothermal energy from geothermal water of a geothermal well pipe in which the flowing medium is positioned through the outer pipe in the flowing process, wherein the geothermal energy causes the temperature of the flowing medium to rise.
3. The system for monitoring geothermal energy at a medium depth of claim 2,
the middle-deep geothermal monitoring system also comprises a water level measuring device; the pipe orifice of the geothermal well pipe is provided with the water level measuring device, and the water level measuring device comprises an ultrasonic liquid level sensor, a second wireless communication interface and a second microprocessor; the ultrasonic liquid level sensor is connected to the second microprocessor, and the second microprocessor is connected to the second wireless communication interface; the ultrasonic liquid level sensor collects the water level information of geothermal water in a geothermal well pipe in real time and transmits the water level information to the second microprocessor; the second microprocessor records the water level information and transmits the water level information to the second wireless communication interface, the second wireless communication interface sends the water level information to the monitoring terminal device, and the monitoring terminal device monitors the water level in the middle-deep geothermal well.
4. The system for monitoring geothermal energy at a medium depth of claim 1,
the annular heat exchange pipe is arranged in an underground dry-hot rock stratum, and the flowing medium flows in the annular pipeline; the upper half part of the outer side wall of the outer pipe is surrounded and wrapped by an upper side cementing layer; the lower half part and the lower side opening of the outer side wall of the outer pipe are surrounded and wrapped by a lower side well cementation layer; the heat conductivity coefficient of the upper well cementation layer is smaller than that of the lower well cementation layer; the flowing medium absorbs geothermal energy from the dry heat rock stratum in which the flowing medium is located through the pipe wall of the outer pipe, the upper well cementation layer and the lower well cementation layer in the downward flowing process, and the temperature of the flowing medium is increased due to the geothermal energy.
5. The system for monitoring geothermal energy at a medium depth of claim 1,
the temperature measuring device is provided with a closed shell, the position sensor, the first microprocessor and the first wireless communication interface are arranged in the closed shell, the temperature sensor is a thermistor wire, and the thermistor wire is wound on the closed shell; the temperature measuring device further comprises a power supply for supplying power to the temperature measuring device, and the power supply is a high-temperature-resistant lithium battery.
6. The system for monitoring geothermal energy at a medium depth of claim 1,
wherein the flowing medium is water or glycol solution.
7. A method for monitoring geothermal energy in a medium-deep layer, comprising:
an outer pipe and an inner pipe are arranged in the annular heat exchange pipe; the inner pipe is arranged in the outer pipe, and the lower opening of the inner pipe is higher than that of the outer pipe; an annular pipeline is formed between the outer side wall of the inner pipe and the inner side wall of the outer pipe;
injecting a flowing medium into the annular pipeline from an upper opening of the outer pipe; the circulating pump drives the flowing medium to flow in the annular heat exchange pipe; the flowing medium flows downwards in the annular pipeline after being injected, and absorbs geothermal energy through the outer pipe in the downward flowing process, and the temperature of the flowing medium is increased due to the geothermal energy;
the flowing medium flows downwards from the outer pipe to the bottom of the annular pipeline under the driving of the circulating pump, then enters the inner pipe to continuously flow upwards and finally flows out of the inner pipe, so that a heat source is provided for a heating system on the ground; the flowing medium is re-injected into the annular pipeline after being cooled;
meanwhile, a temperature measuring device is arranged in the annular heat exchange tube; the temperature measuring device flows in the annular heat exchange tube along with the flowing medium in a circulating mode, and continuously measures and records geothermal temperature information; the temperature measuring device is provided with a temperature sensor, a position sensor, a first microprocessor and a first wireless communication interface;
when the temperature measuring device is positioned at the opening at the upper side of the outer pipe, the temperature measuring device starts to measure and record geothermal temperature information; in the process that the temperature measuring device flows from top to bottom in the annular pipeline and from bottom to top in the inner pipe, the temperature sensor continuously measures temperature values and transmits the temperature values to the first microprocessor connected with the temperature sensor, the position sensor continuously acquires corresponding position information and transmits the position information to the first microprocessor connected with the position sensor, and the first microprocessor correspondingly records the temperature values and the position information and generates geothermal temperature information; when one circulation flow is finished, namely the temperature measuring device reaches the opening at the upper side of the inner pipe, the first microprocessor transmits the geothermal temperature information to a first wireless communication interface connected with the first microprocessor, and the geothermal temperature information is sent to the monitoring terminal device through the first wireless communication interface, and the monitoring terminal device monitors the geothermal temperature.
8. The method for monitoring geothermal heat at a medium depth according to claim 7,
arranging the annular heat exchange tube in a geothermal well tube, and immersing the annular heat exchange tube into geothermal water in the geothermal well tube; the injected flowing medium flows in the annular pipeline, and absorbs geothermal energy from geothermal water of a geothermal well pipe in which the flowing medium is positioned through the outer pipe in the flowing process, wherein the geothermal energy causes the temperature of the flowing medium to rise.
9. The method for monitoring geothermal heat at a medium depth according to claim 8,
the pipe orifice of the geothermal well pipe is provided with the water level measuring device, and the water level measuring device comprises an ultrasonic liquid level sensor, a second wireless communication interface and a second microprocessor; the ultrasonic liquid level sensor is connected to the second microprocessor, and the second microprocessor is connected to the second wireless communication interface; the ultrasonic liquid level sensor collects the water level information of geothermal water in a geothermal well pipe in real time and transmits the water level information to the second microprocessor; the second microprocessor records the water level information and transmits the water level information to the second wireless communication interface, the second wireless communication interface sends the water level information to the monitoring terminal device, and the monitoring terminal device monitors the water level in the middle-deep geothermal well.
10. The method for monitoring geothermal heat at a medium depth according to claim 7,
arranging the annular heat exchange tube in an underground dry-hot rock stratum, wherein the flowing medium flows in the annular pipeline; the upper half part of the outer side wall of the outer pipe is surrounded and wrapped by an upper side cementing layer; the lower half part and the lower side opening of the outer side wall of the outer pipe are surrounded and wrapped by a lower side well cementation layer; the heat conductivity coefficient of the upper well cementation layer is smaller than that of the lower well cementation layer; the flowing medium absorbs geothermal energy from the dry heat rock stratum in which the flowing medium is located through the pipe wall of the outer pipe, the upper well cementation layer and the lower well cementation layer in the downward flowing process, and the temperature of the flowing medium is increased due to the geothermal energy.
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