CN112780232A - Pressure-control heat-insulation exploitation system for hot dry rock - Google Patents
Pressure-control heat-insulation exploitation system for hot dry rock Download PDFInfo
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- CN112780232A CN112780232A CN202110133798.7A CN202110133798A CN112780232A CN 112780232 A CN112780232 A CN 112780232A CN 202110133798 A CN202110133798 A CN 202110133798A CN 112780232 A CN112780232 A CN 112780232A
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- 238000009413 insulation Methods 0.000 title claims abstract description 54
- 238000002347 injection Methods 0.000 claims abstract description 42
- 239000007924 injection Substances 0.000 claims abstract description 42
- 238000005065 mining Methods 0.000 claims abstract description 38
- 238000000605 extraction Methods 0.000 claims abstract description 29
- 238000012545 processing Methods 0.000 claims abstract description 18
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/003—Insulating arrangements
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/006—Combined heating and pumping means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T50/00—Geothermal systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/01—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using means for separating solid materials from heat-exchange fluids, e.g. filters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The invention provides a pressure-control heat-insulation dry hot rock mining system, which relates to the technical field of high-temperature geothermal and dry hot rock resource mining and comprises the following steps: the extraction well is used for pumping a target heat extraction working medium to the heat exchanger, wherein the target heat extraction working medium is a heat extraction working medium heated by the hot dry rock; ground equipment for carry out the target processing to target heat recovery working medium, obtain the target heat recovery working medium after handling to carry the target heat recovery working medium after handling to the injection well, wherein, the target is handled and is included: filtering, heat exchanging, adding medicine, removing impurity; the injection well is used for conveying the treated target heat extraction working medium to the hot dry rock so that the hot dry rock can heat the treated target heat extraction working medium; the heat insulation pipeline is used for conveying and insulating the heat collecting working medium of the dry hot rock pressure control heat insulation mining system; the pressure adjusting equipment is used for adjusting the pressure in the pressure-control heat-insulation dry hot rock mining system, and solves the technical problems of poor stability and large heat loss of the conventional dry hot rock mining system.
Description
Technical Field
The invention relates to the technical field of high-temperature geothermal and dry hot rock resource exploitation, in particular to a dry hot rock pressure-control heat-insulation exploitation system.
Background
In recent years, the development and utilization of deep geothermal resources have been rapidly advanced, and the development and utilization of deep geothermal resources have become a key research strategy to replace clean energy in countries around the world. Deep geothermal heat can be classified into two types, hydrothermal type and dry hot rock type, depending on the form of existence. The hot dry rock is a high-temperature rock mass which is buried underground and does not contain water or steam, mainly takes igneous rocks such as granite and the like, has the characteristics of high temperature, hardness and compactness, and the heat energy contained in the hot dry rock is a target for development and utilization. The development potential of the hot dry rock resources is huge, the distribution range is wide, cleanness and sustainability are realized, and the energy contained in the hot dry rock within the depth range of 3-10 kilometers of the deep part of the earth crust is estimated to be 30 times of the total energy of the global stone energy source. Under the current technical condition, the exploitation of the heat energy of the hot dry rock needs to implement multi-hole drilling into the high-temperature hard hot dry rock, and adopts methods such as fracturing and the like to realize communication among wells, a heat production working medium (generally water) enters a stratum through an injection well to exchange heat with the hot dry rock, the heated heat production working medium is extracted to the ground through an extraction well, and the heated heat production working medium enters the injection well again after being cooled on the ground to form circulation. The heat collecting working medium involved in the process continuously exchanges heat with the hot dry rock and collects heat out of the ground, and how to realize the continuous and stable circulation process is one of the key problems in realizing the exploitation and utilization of hot dry rock resources.
At present, foreign hot dry rock projects generally adopt a simple injection-production circulation mode to carry out heat extraction, and an underground pipe column does not adopt heat insulation measures, so that the extraction process is unstable, the extraction rate is low, the heat loss is large, and the self-consumption energy is large; in China, related experimental researches for hot dry rock heat energy exploitation, such as single-well exploitation, but the single-well mode is fast in heat reduction and incapable of being continuously and stably exploited due to the fact that the heat exchange area is too small, and no heat insulation measure is taken in domestic related hydrothermal geothermal exploitation.
Disclosure of Invention
In view of this, the present invention provides a pressure-controlled thermal-insulated dry hot rock mining system, so as to alleviate the technical problems of poor stability and large heat loss of the existing dry hot rock mining system.
In a first aspect, an embodiment of the present invention provides a pressure-controlled thermal-insulated dry hot rock mining system, including: the system comprises a production well, ground equipment, an injection well, an insulation pipeline and pressure regulating equipment, wherein the ground equipment is respectively connected with the production well, the injection well and the pressure regulating equipment through the insulation pipeline; the extraction well is used for pumping a target heat extraction working medium to the ground equipment, wherein the target heat extraction working medium is a heat extraction working medium heated by dry hot rock; the ground equipment is used for carrying out target treatment on the target heat production working medium to obtain a treated target heat production working medium and conveying the treated target heat production working medium to the injection well, wherein the target treatment comprises the following steps: filtering, heat exchanging, adding medicine, removing impurity; the injection well is used for conveying the treated target heat production working medium to the dry hot rock so that the dry hot rock can heat the treated target heat production working medium; the heat insulation pipeline is used for conveying and insulating the heat collecting working medium of the dry hot rock pressure control heat insulation mining system; and the pressure regulating equipment is used for regulating the pressure in the dry hot rock pressure-control heat-insulation mining system.
Further, the insulated duct includes: the system comprises a first well pipeline, a second well pipeline and a ground pipeline, wherein the second well pipeline is arranged in the injection well.
Furthermore, a high-voltage electric submersible pump and the first well pipeline are arranged in the production well, wherein the high-voltage electric submersible pump is connected with the ground equipment through the first well pipeline and the ground pipeline.
Further, the ground equipment comprises: the device comprises a filter, a heat exchanger, a processing device and a dosing port, wherein the filter, the heat exchanger, the processing device and the dosing port are sequentially connected through a ground pipeline, and the dosing port is connected with a pipeline in the second well through the ground pipeline; the filter is used for filtering the target heat collection working medium; the heat exchanger is used for carrying out heat exchange on the filtered heat collection working medium to obtain a target heat collection working medium for completing the heat exchange; the processing device is used for removing target substances in the target heat collection working medium which completes heat exchange to obtain an intermediate heat collection working medium, wherein the target substances comprise impurities and easily-scaling components; and the medicine adding port is used for adding a medicine into the intermediate heat collection working medium to obtain the processed target heat collection working medium.
Further, the pressure adjusting apparatus includes: the system comprises a backpressure pump, a buffer tank, a pressurization water replenishing pump, a water storage tank and a monitoring instrument, wherein the backpressure pump is connected with the production well through a ground pipeline, the buffer tank is connected with the filter and the production well through the ground pipeline, the pressurization water replenishing pump is respectively connected with the water storage tank, the water treatment device, a chemical feeding port and the injection well through the ground pipeline, and the monitoring instrument is arranged on a heat insulation pipeline; the backpressure pump is used for maintaining backpressure in the production well; the buffer tank is used for providing buffer for the target heat production working medium so as to avoid pressure pulse generated in the dry hot rock pressure-control heat-insulation mining system; the reservoir is used for storing make-up water and injecting the make-up water into the target heat collection working medium which completes heat exchange through the pressurizing make-up water pump; the pressurizing and water supplementing pump is used for pressurizing and supplementing the target heat collection working medium which completes heat exchange under the condition that the target heat collection working medium which completes heat exchange is water; the monitoring instrument is used for collecting operation data in the dry heat rock pressure control heat insulation mining system, wherein the operation data comprises: pressure data, flow data and temperature data.
Further, the monitoring meter includes: the first group of monitoring instrument, the second group of monitoring instrument, third group of monitoring instrument and fourth group of monitoring instrument, wherein, the first group of monitoring instrument sets up back of the body pressure pump with on the ground pipeline between the producing well, the second group of monitoring instrument sets up the buffer tank with on the ground pipeline between the producing well, the third group of monitoring instrument sets up pressure boost moisturizing pump with on the ground pipeline between the injection well, the fourth group of monitoring instrument sets up on the injection well.
Further, the heat insulation pipeline is a hollow heat insulation pump pipe or a heat insulation pump pipe filled with heat insulation materials.
Further, the heat collecting working medium is water or other fluids, wherein the other fluids include one of the following fluids: carbon dioxide, nitrogen.
Further, the number of production wells and injection wells is one or more, and the type of production wells and injection wells is one of: vertical wells, inclined wells, horizontal wells.
Further, the operation state of the supercharging water replenishing pump is intermittent operation.
In the embodiment of the invention, a target heat production working medium is pumped to a heat exchanger through a production well, wherein the target heat production working medium is a heat production working medium heated by dry hot rock; the ground equipment carries out target processing to the target heat production working medium, obtains the target heat production working medium after handling to carry the target heat production working medium after handling to the injection well, wherein, target processing includes: filtering, heat exchanging, adding medicine, removing impurity; the injection well conveys the treated target heat production working medium to the hot dry rock so that the hot dry rock heats the treated target heat production working medium; the heat insulation pipeline conveys and insulates heat of the heat collecting working medium of the dry hot rock pressure control heat insulation mining system; the pressure regulating device regulates the pressure in the dry hot rock pressure control heat insulation mining system, the purpose of regulating the pressure in the system by using the pressure regulating device and reducing the heat loss of the system by using a heat insulation pipeline is achieved, and the technical problems of poor stability and large heat loss of the conventional dry hot rock mining system are solved, so that the technical effects of improving the stability and the economic benefit of the dry hot rock mining system are achieved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a pressure-controlled, heat-insulated extraction system for hot dry rock according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another pressure and heat controlled thermal insulated extraction system for hot dry rock according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a pressure control principle of a hot dry rock pressure-control heat-insulation mining system according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. 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 first embodiment is as follows:
according to an embodiment of the present invention, an embodiment of a hot dry rock pressure control and thermal insulation mining system is provided.
Referring to fig. 1, fig. 1 is a schematic view of a pressure-controlled and heat-insulated dry hot rock mining system according to an embodiment of the present invention, as shown in fig. 1, the system including: the system comprises a production well 10, surface equipment 20, an injection well 30, an insulated pipeline 40 and pressure regulating equipment 50, wherein the surface equipment is respectively connected with the production well, the injection well and the pressure regulating equipment through the insulated pipeline;
the extraction well 10 is used for pumping a target heat extraction working medium to the ground equipment, wherein the target heat extraction working medium is a heat extraction working medium heated by dry hot rock;
the ground equipment 20 is configured to perform target processing on the target heat recovery working medium to obtain a processed target heat recovery working medium, and deliver the processed target heat recovery working medium to the injection well, where the target processing includes: filtering, heat exchanging, adding medicine, removing impurity;
the injection well 30 is used for conveying the treated target heat production working medium to the hot dry rock so that the hot dry rock can heat the treated target heat production working medium;
it should be noted that the heat collecting working medium may be water, or other fluids such as carbon dioxide and nitrogen.
The heat insulation pipeline 40 is used for conveying and insulating the heat collecting working medium of the dry hot rock pressure control heat insulation mining system;
it should be noted that the above-mentioned heat insulation pipeline is mainly a well pipeline, and the well pipeline is a vacuum heat insulation pump pipe or a heat insulation pump pipe filled with heat insulation material.
The heat insulation pipeline provided by the invention can be used for mining the dry heat rock, so that the heat loss of a heat mining working medium in a mining well and an injection well can be reduced, and the heat extraction efficiency is improved.
The pressure regulating device 50 is used for regulating the pressure in the dry hot rock pressure-control heat-insulation mining system.
It should be noted that the number of the production wells and the injection wells may be both single-hole and multi-hole, and the well type may be vertical wells, inclined wells and horizontal wells.
In the embodiment of the invention, a target heat production working medium is pumped to a heat exchanger through a production well, wherein the target heat production working medium is a heat production working medium heated by dry hot rock; the ground equipment carries out target processing to the target heat production working medium, obtains the target heat production working medium after handling to carry the target heat production working medium after handling to the injection well, wherein, target processing includes: filtering, heat exchanging, adding medicine, removing impurity; the injection well conveys the treated target heat production working medium to the hot dry rock so that the hot dry rock heats the treated target heat production working medium; the heat insulation pipeline conveys and insulates heat of the heat collecting working medium of the dry hot rock pressure control heat insulation mining system; the pressure regulating device regulates the pressure in the dry hot rock pressure control heat insulation mining system, the purpose of regulating the pressure in the system by using the pressure regulating device and reducing the heat loss of the system by using a heat insulation pipeline is achieved, and the technical problems of poor stability and large heat loss of the conventional dry hot rock mining system are solved, so that the technical effects of improving the stability and the economic benefit of the dry hot rock mining system are achieved.
In the prior art, a dry hot rock guessing system adopts a simple injection-production circulation mode to carry out heat exploitation, the exploitation process is unstable, the exploitation rate is low, the self-consumption energy is large, and frequent stress detours easily induce earthquakes; related experimental researches for the exploitation of the heat energy of the hot dry rock exist in China, such as single-well exploitation, but the single-well mode has the problems that the produced heat is reduced quickly and cannot be continuously and stably maintained due to the fact that the heat exchange area is too small. The system and the method for controlling the pressure of each stage of the whole circulating system are used as the core, the pressure is controlled to keep the hot dry rock thermal storage fracture stably opened and the system balanced, the scaling is reduced, the heat loss of a delay is reduced by combining a heat insulation pipeline, the heat energy of the hot dry rock is stably, continuously, economically, efficiently and safely extracted by a heat collecting working medium (generally water), and the development and utilization of hot dry rock resources are realized.
In an embodiment of the present invention, the heat insulation circuit 40 includes: a first wellbore pipe 401, a second wellbore pipe 402 and a surface pipe 403, said second wellbore pipe being arranged in said injection wellbore.
The production well is internally provided with a high-voltage electric submersible pump 11 and a first well pipeline, wherein the high-voltage electric submersible pump is connected with ground equipment through the first well pipeline and the ground pipeline.
In the invention, the high-voltage electric submersible pump pumps the target heat collection working medium into the ground pipeline through the heat insulation pipeline.
The pressure-controlled mining can maintain the thermal storage fracture of the dry hot rock to be stably opened, reduce the flow resistance of a thermal medium in the fracture, maintain the mining circulation only by a high-temperature electric submersible pump in a well for most of time, realize stable and balanced thermal mining, have low self-consumption energy, avoid large-amplitude pressure fluctuation and reduce scaling.
In the embodiment of the present invention, as shown in fig. 2, the ground equipment 20 includes: the device comprises a filter 21, a heat exchanger 22, a processing device 23 and a dosing port 24, wherein the filter, the heat exchanger, the processing device and the dosing port are sequentially connected through a ground pipeline, and the dosing port is connected with a second well pipeline through the ground pipeline;
the filter 21 is used for filtering the target heat collection working medium;
the heat exchanger 22 is used for carrying out heat exchange on the filtered heat collecting working medium to obtain a target heat collecting working medium for completing the heat exchange;
the processing device 23 is configured to remove a target substance in the target heat collection working medium subjected to heat exchange to obtain an intermediate heat collection working medium, where the target substance includes impurities and easily-scaling components;
and the chemical feeding port 24 is used for adding a chemical into the intermediate heat collection working medium to obtain the processed target heat collection working medium.
In the embodiment of the present invention, as shown in fig. 2, the pressure adjusting apparatus 50 includes: a backpressure pump 51, a buffer tank 52, a pressurization water supplementing pump 53, a water storage tank 54 and a monitoring instrument 55, wherein the backpressure pump is connected with the production well through the ground pipeline, the buffer tank is connected with the filter and the production well through the ground pipeline, the pressurization water supplementing pump is respectively connected with the water storage tank, the water treatment device, a dosing port and the injection well through the ground pipeline, and the monitoring instrument is arranged on the heat insulation pipeline;
the backpressure pump 51 is used for maintaining backpressure in the production well;
the buffer tank 52 is used for providing buffer for the target heat-collecting working medium so as to avoid pressure pulse generated in the dry hot rock pressure-control heat-insulation mining system;
the water storage tank 54 is used for storing make-up water and injecting the make-up water into the target heat collection working medium after heat exchange is completed through the pressurizing make-up water pump;
the pressurizing and water replenishing pump 53 is used for pressurizing and replenishing the target heat collection working medium after heat exchange is finished under the condition that the target heat collection working medium after heat exchange is water;
the monitoring instrument 55 is configured to collect operation data in the pressure-controlled and heat-insulated dry hot rock mining system, where the operation data includes: pressure data, flow data and temperature data.
It should be noted that the booster water pump is operated intermittently, and is not required to be operated in most of the time, and the pressure provided by the electric submersible pump of the production well is enough to maintain the injection pressure, so as to form a circulation.
In addition, the monitoring meter 55 includes: a first set of monitoring instruments 551, a second set of monitoring instruments 552, a third set of monitoring instruments 553 and a fourth set of monitoring instruments 554, wherein the first set of monitoring instruments are disposed on the surface pipeline between the backpressure pump and the production well, the second set of monitoring instruments are disposed on the surface pipeline between the buffer tank and the production well, the third set of monitoring instruments are disposed on the surface pipeline between the pressure boosting water replenishing pump and the injection well, and the fourth set of monitoring instruments are disposed on the injection well.
The operation of the above system will be described in detail with reference to fig. 1 and 2.
The high-temperature electric submersible pump extracts hot water into a ground pipeline through a first underground heat insulation pipeline, a buffer tank is arranged in the ground pipeline in an extending way so as to prevent the system from generating pressure pulse, and then the hot water enters a heat exchanger through a filter to exchange heat with a power generation utilization system and the like.
The cooled cold water enters a reinjection stage and flows through a pressurizing and water supplementing pump through a processing device, and the pressurizing and water supplementing pump automatically and intermittently operates according to the water volume and the pressure condition of the system to maintain the pressure and the water volume of the circulating system. And then, cold water enters the hot dry rock thermal storage crack through the second borehole heat insulation pipeline and the injection well 2, is heated by the hot dry rock thermal storage to become hot water, and enters the production well.
As shown in fig. 3, the extraction well is provided with a back pressure pump, back pressure P0 of the extraction well is maintained through back pressure fluid (gas or water), so that the bottom pressure is improved, the opening degree of a dry hot rock thermal storage crack near the extraction well is maintained, the friction resistance of a reservoir is reduced, the injection pressure P2 is reduced, the circulation of the whole system is realized through a high-temperature submersible pump, and meanwhile, the flash evaporation of water in the extraction well due to high temperature can be avoided.
The high-temperature electric submersible pump lifts the hot water extraction pump to P1, ground pressure drop is generated after the hot water extraction pump passes through ground pipelines and facilities, the injection pressure drop is P2, and P2 is larger than reservoir friction resistance and well production back pressure to form circulation.
And carrying out pressurization and water supplement according to the pressure and water quantity conditions of the system.
Monitoring instruments such as a pressure gauge, a flow meter and a thermometer are arranged in each link, and the system automatically stabilizes the pressure and the flow of the system under a preset control strategy according to the actual conditions of the pressure and the flow.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A hot dry rock pressure control and heat insulation mining system is characterized by comprising: the system comprises a production well, ground equipment, an injection well, an insulation pipeline and pressure regulating equipment, wherein the ground equipment is respectively connected with the production well, the injection well and the pressure regulating equipment through the insulation pipeline;
the extraction well is used for pumping a target heat extraction working medium to the ground equipment, wherein the target heat extraction working medium is a heat extraction working medium heated by dry hot rock;
the ground equipment is used for carrying out target treatment on the target heat production working medium to obtain a treated target heat production working medium and conveying the treated target heat production working medium to the injection well, wherein the target treatment comprises the following steps: filtering, heat exchanging, adding medicine, removing impurity;
the injection well is used for conveying the treated target heat production working medium to the dry hot rock so that the dry hot rock can heat the treated target heat production working medium;
the heat insulation pipeline is used for conveying and insulating the heat collecting working medium of the dry hot rock pressure control heat insulation mining system;
and the pressure regulating equipment is used for regulating the pressure in the dry hot rock pressure-control heat-insulation mining system.
2. The system of claim 1, wherein the thermal isolation circuit comprises: the system comprises a first well pipeline, a second well pipeline and a ground pipeline, wherein the second well pipeline is arranged in the injection well.
3. The system of claim 2,
the production well is internally provided with a high-voltage electric submersible pump and a first well pipeline, wherein the high-voltage electric submersible pump is connected with the ground equipment through the first well pipeline and the ground pipeline.
4. The system of claim 2, wherein the surface equipment comprises: the device comprises a filter, a heat exchanger, a processing device and a dosing port, wherein the filter, the heat exchanger, the processing device and the dosing port are sequentially connected through a ground pipeline, and the dosing port is connected with a pipeline in the second well through the ground pipeline;
the filter is used for filtering the target heat collection working medium;
the heat exchanger is used for carrying out heat exchange on the filtered heat collection working medium to obtain a target heat collection working medium for completing the heat exchange;
the processing device is used for removing target substances in the target heat collection working medium which completes heat exchange to obtain an intermediate heat collection working medium, wherein the target substances comprise impurities and easily-scaling components;
and the medicine adding port is used for adding a medicine into the intermediate heat collection working medium to obtain the processed target heat collection working medium.
5. The system of claim 4, wherein the pressure regulating device comprises: the system comprises a backpressure pump, a buffer tank, a pressurization water replenishing pump, a water storage tank and a monitoring instrument, wherein the backpressure pump is connected with the production well through a ground pipeline, the buffer tank is connected with the filter and the production well through the ground pipeline, the pressurization water replenishing pump is respectively connected with the water storage tank, the water treatment device, a chemical feeding port and the injection well through the ground pipeline, and the monitoring instrument is arranged on a heat insulation pipeline;
the backpressure pump is used for maintaining backpressure in the production well;
the buffer tank is used for providing buffer for the target heat production working medium so as to avoid pressure pulse generated in the dry hot rock pressure-control heat-insulation mining system;
the reservoir is used for storing make-up water and injecting the make-up water into the target heat collection working medium which completes heat exchange through the pressurizing make-up water pump;
the pressurizing and water supplementing pump is used for pressurizing and supplementing the target heat collection working medium which completes heat exchange under the condition that the target heat collection working medium which completes heat exchange is water;
the monitoring instrument is used for collecting operation data in the dry heat rock pressure control heat insulation mining system, wherein the operation data comprises: pressure data, flow data and temperature data.
6. The system of claim 5, wherein the monitoring meter comprises: the first group of monitoring instrument, the second group of monitoring instrument, third group of monitoring instrument and fourth group of monitoring instrument, wherein, the first group of monitoring instrument sets up back of the body pressure pump with on the ground pipeline between the producing well, the second group of monitoring instrument sets up the buffer tank with on the ground pipeline between the producing well, the third group of monitoring instrument sets up pressure boost moisturizing pump with on the ground pipeline between the injection well, the fourth group of monitoring instrument sets up on the injection well.
7. The system of claim 1, wherein the insulated conduit is a hollow insulated pump tube or an insulated pump tube filled with insulation.
8. The system of claim 1, wherein the heat recovery working fluid is water or other fluid, wherein the other fluid comprises one of: carbon dioxide, nitrogen.
9. The system of claim 1, wherein the number of production wells and injection wells is one or more and the type of production wells and injection wells is one of: vertical wells, inclined wells, horizontal wells.
10. The system of claim 5, wherein the operating state of the boost water supplement pump is intermittent operation.
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