CN111306821A - Clean and efficient development system and method for geothermal resources - Google Patents
Clean and efficient development system and method for geothermal resources Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
- F03G7/04—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using pressure differences or thermal differences occurring in nature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
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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
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T2010/50—Component parts, details or accessories
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- 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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Abstract
The invention discloses a clean and efficient development system for geothermal resources, which comprises a plurality of geothermal single wells, wherein each geothermal single well comprises a first well section and a second well section; an upper heat insulation and production pipe is arranged in the first well section, and a lower heat insulation and production pipe and a heat conduction and transfer pipe which are communicated are arranged in the second well section; a first annulus is formed between the upper heat insulation production pipe and the first well section; a second annulus is formed among the lower heat insulation heat production pipe, the heat conduction heat transfer pipe and the second well section; the upper heat-insulation heat-production pipe and the lower heat-insulation heat-production pipe are connected through a flow channel variable controller; each geothermal single well is connected with a liquid distribution pipeline through a wellhead device, and the liquid distribution pipeline is communicated with the first annulus; the upper heat-insulation heat-production pipe is communicated with the steam return pipeline; the steam return pipeline is connected with the pressure power generation device. According to the invention, the acquisition of the dry heat rock geothermal energy by the liquid heat transfer working medium is realized through the arrangement of the geothermal single well, the upper heat-insulating and heat-collecting pipe, the flow channel variable controller, the lower heat-insulating and heat-collecting pipe and the heat-conducting and heat-transferring pipe in the geothermal single well.
Description
Technical Field
The invention belongs to the technical field of geothermal resource development, and particularly relates to a clean and efficient geothermal resource development system and method.
Background
Under the current background that climate is gradually worsened, new energy and renewable energy are sought to be developed, fossil energy resources are increasingly scarce, and nuclear power safety is under debate, the seeking of clean energy and the development and utilization of clean energy are hot problems of energy field research. Compared with the traditional fossil energy, the geothermal resource is clean energy and renewable energy; compared with wind energy and solar energy, the utilization coefficient is high, and the stability is good; in addition, the development and utilization of the terrestrial heat have important strategic significance for solving the problems of climate change and atmospheric pollution, improving the energy structure and ensuring the energy safety in China. Therefore, geothermal resources are becoming hot spots of concern in the field of resource development. How to effectively exploit geothermal resources is a problem which needs to be solved urgently in the energy field at present, and is a hotspot for research in the fields of new energy development and renewable energy development.
Currently, two methods are used to exploit geothermal resources: (1) exploiting underground hot water to the surface (common geothermal resources); (2) the geothermal formation is fractured, fluid is injected, and the heated fluid is produced to the surface (hot dry rock geothermal resource). However, the above two methods have the following problems: (1) the mining cost is high, a large amount of hot fluid needs to be lifted to the ground, and the energy consumption is serious; (2) the pollution is serious, and in any mode, the hot fluid carries a large amount of mineral substances or harmful substances to the ground, so that the pollution is caused; (3) the heat energy utilization rate is low, and heat dissipation conditions exist in the process that hot fluid is lifted to the ground.
Therefore, it is desirable to develop a system and method for geothermal resources to reduce the mining cost, suppress environmental pollution and improve the heat utilization efficiency.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a clean and efficient development system for geothermal resources and a development method for the system.
In order to achieve the purpose, the invention adopts the following technical scheme:
the geothermal resource cleaning and efficient development system comprises a plurality of geothermal single wells, wherein each geothermal single well comprises a first well section extending from the ground to a dry heat rock heat insulation layer and a second well section extending from the dry heat rock heat insulation layer to the dry heat layer and extending transversely along the dry heat layer; the second well section of each geothermal single well extends along different directions;
an upper heat insulation heat production pipe is arranged in the first well section along the axial direction of the well section, and a lower heat insulation heat production pipe and a heat conduction heat transfer pipe which are communicated are sequentially arranged in the second well section along the axial direction of the well section; a first annulus is formed between the upper heat insulation heat production pipe and the first well section; a second annulus is formed among the lower heat insulation heat production pipe, the heat conduction heat transfer pipe and the second well section;
the upper heat-insulation heat-production pipe and the lower heat-insulation heat-production pipe are connected through a flow channel variable controller; the flow channel variable controller is used for communicating the first annulus with the lower heat insulation heat production pipe, and the flow channel variable controller is used for communicating the second annulus with the upper heat insulation heat production pipe;
each geothermal single well is connected with a respective liquid distribution pipeline through a respective wellhead device, and the liquid distribution pipeline is connected with a liquid distribution station; the liquid distribution pipeline is communicated with a first annular space in the corresponding geothermal single well through a wellhead device; the upper heat-insulating heat recovery pipe of the geothermal single well is communicated with respective steam return pipelines through a wellhead device;
the steam return pipeline is connected with the input end of the pressure power generation device, the output end of the pressure power generation device is connected with the pressure power generation output pipeline, and all the pressure power generation output pipelines are converged into a pressure output main pipeline.
Preferably, a surface casing is sleeved in the first well section, a technical casing is arranged in the surface casing, and a first annulus is formed between the upper heat insulation heat production pipe and the technical casing.
Preferably, a surface cement sheath is sealed between one end of the surface casing, which is positioned at the top end of the borehole, and a technical cement sheath is arranged between one end of the technical casing, which is positioned in the hot dry rock thermal insulation layer, and the surface casing.
Preferably, the flow channel variable controller comprises a cylindrical body connected with the inner wall surface of the technical sleeve, one end of the cylindrical body is provided with a first joint used for being connected with the upper heat insulation and production pipe, and a main backflow channel communicated with the upper heat insulation and production pipe is arranged in the first joint; the other end of the cylindrical body is provided with a second joint used for being connected with the lower heat insulation and production pipe, and an inflow main channel communicated with the lower heat insulation and production pipe is arranged in the second joint; a plurality of inflow branch channels communicated with the first annular space and the inflow main channel are uniformly arranged in the cylindrical body along the circumferential direction; a plurality of backflow branch channels communicated with the second annular space and the backflow main channel are uniformly arranged in the cylindrical body along the circumferential direction; the inflow sub-channels and the backflow sub-channels are arranged in a staggered mode.
Preferably, a heat insulation sealing assembly is arranged between the cylindrical body and the technical casing.
Preferably, the output end of the pressure power generation device is also connected with the input end of the thermal power generation device through a thermal power generation input pipeline, and the output end of the thermal power generation device is connected with a thermal power generation output pipeline.
Preferably, the output end of the thermal power generation device is also connected with the liquid distribution station through a recovery pipeline.
Preferably, a flow control valve is arranged on the thermal power generation input pipeline.
The invention also provides a clean and efficient development method of geothermal resources, which utilizes the clean and efficient development system of geothermal resources and comprises the following steps:
the method comprises the following steps: the low-boiling-point liquid heat transfer working medium is sent into each liquid distribution pipeline from the liquid distribution station, flows through each wellhead device and then enters a first annulus of the geothermal single well;
step two: the liquid heat transfer working medium entering the first annulus flows into the lower heat insulation heat production pipe through the inflow branch channel and the inflow main channel and then flows through the heat conduction heat transfer pipe;
step three: the liquid heat transfer working medium flows through the heat transfer pipe and then enters the second annular space for heat exchange and then is vaporized;
step four: the vaporized heat transfer working medium enters the heat insulation heat production pipe through the reflux branch channel and the reflux main channel by utilizing the pressure difference generated in the vaporized shaft;
step five: the heat transfer working medium vaporized in the inlet heat insulation heat production pipe flows into respective steam return pipelines through respective wellhead devices, the steam return pipelines convey the vaporized heat transfer working medium to the pressure power generation device, the pressure power generation device converts pressure energy and kinetic energy carried by the steam conveyed from the steam return pipelines into electric energy, and the pressure power generation output pipelines output the electric energy converted by the pressure power generation devices for further utilization;
step six: the pressure power generation device inputs the high-temperature heat transfer working medium which releases pressure energy and kinetic energy to the thermal power generation device through the thermal power generation input pipeline, the thermal power generation device converts the heat energy carried by the steam transmitted from each thermal power generation input pipeline into electric energy, and the thermal power generation output pipeline outputs the electric energy converted by the thermal power generation device for further utilization;
step seven: the recovery pipeline conveys the heat transfer working medium which is completely utilized in the thermal power generation device to the liquid distribution station again for next recycling.
The invention has the beneficial effects that:
(1) the clean and efficient development system for geothermal resources realizes the acquisition of the geothermal energy of the dry hot rock by the liquid heat transfer working medium through the arrangement of the plurality of geothermal single wells and the upper heat-insulating heating pipes, the flow channel variable controller, the lower heat-insulating heating pipes and the heat-conducting pipes in the geothermal single wells, and has the following advantages that: complex fracturing operation is not needed, economic cost is saved, and the problems of communication of fractures among the conventional EGS wells and earthquake induced by fracturing are avoided; secondly, the method comprises the following steps: the heat transfer working medium circularly exchanges heat in the closed shaft and is not in direct contact with the stratum, so that the problems of equipment corrosion and scaling are avoided on one hand, and the heat transfer working medium can not carry a large amount of mineral substances or harmful substances to the ground on the other hand, thereby avoiding pollution; thirdly, the method comprises the following steps: after the liquid heat transfer working medium absorbs terrestrial heat to be vaporized, the injected liquid heat transfer working medium and the vaporized gaseous heat transfer working medium generate pressure difference in the shaft, and the vaporized heat transfer working medium returns under the action of the pressure difference, so that a conveying device is not needed for lifting the hot fluid, and energy consumption is reduced; fourthly: the upper heat-insulating heat-collecting pipe, the lower heat-insulating heat-collecting pipe and the heat-conducting pipe are all positioned in the geothermal single well, so that the heat loss in the heat collecting process is effectively reduced, the heat collecting efficiency is greatly improved, and meanwhile, the heat transfer working medium is completely recovered, so that the problem of heat collecting efficiency reduction caused by heat transfer working medium loss is avoided.
(2) The invention relates to a clean and efficient development method of geothermal resources, which leads low-boiling-point liquid heat transfer working medium to reach a second annulus through a liquid distribution station, a liquid distribution pipeline, a first annulus, an inflow branch channel, an inflow main channel, a lower heat insulation heat collection pipe and a heat conduction heat transfer pipe, the liquid heat transfer medium absorbs the heat energy of a dry hot rock stratum in the second annulus to be vaporized into high-temperature gaseous heat transfer working medium, and the high-temperature gaseous heat transfer working medium returns to the ground through a backflow branch channel, a backflow main channel and an upper heat insulation heat collection pipe, thereby realizing the acquisition of geothermal of the dry hot rock stratum; meanwhile, the pressure energy and the kinetic energy of the high-temperature gaseous heat transfer working medium generated in the geothermal single well are utilized to convert the high-temperature gaseous heat transfer working medium into electric energy for utilization; meanwhile, the recovery pipeline conveys the heat transfer working medium which is completely utilized in the thermal power generation device to the liquid distribution station again, so that the self-circulation of the heat transfer working medium is realized, and the energy input is reduced to a great extent; in addition, each geothermal single well in the clean and efficient geothermal resource development system can complete the liquid injection and gas production process of heat production, so that the operation cost is obviously reduced, and the heat production efficiency is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic structural diagram of a clean and efficient geothermal resource development system according to the present invention;
FIG. 2 is a schematic structural diagram of a geothermal single well in the clean and efficient geothermal resource development system of the invention;
FIG. 3 is a cross-sectional view of the plumb line of the flow channel controller in the clean and efficient geothermal resource development system according to the present invention;
FIG. 4 is a sectional view taken along line A-A of FIG. 3;
FIG. 5 is a sectional view taken along line B-B of FIG. 4;
FIG. 6 is a schematic view of the connection of the first annulus to the branch inflow channel and the main inflow channel of the flow path controller according to the present invention;
FIG. 7 is a schematic view of the connection of the second annulus to the return branch passage and the return main passage of the flow path controller according to the present invention;
wherein:
a. a normal temperature gradient stratum, b, a hot dry rock heat insulation layer, c, hot dry rock;
1. a liquid preparation station 2, a liquid preparation pipeline 3 and a wellhead device;
4. 4-1 parts of geothermal single well, 4-2 parts of surface casing, 4-2 parts of surface cement sheath,
4-3 parts of technical casing, 4-4 parts of technical casing cement sheath, 4-5 parts of upper heat insulation and heat collection pipe,
4-6 parts of flow channel variable controller, 4-6-1 parts of cylindrical body, 4-6-2 parts of first connector,
4-6-3, a return main channel 4-6-4, a second joint 4-6-5, an inflow main channel,
4-6-6 parts of inflow branch channel, 4-6-7 parts of backflow branch channel, 4-6-8 parts of heat insulation sealing assembly,
4-7 parts of lower heat insulation and production pipe, 4-8 parts of heat conduction and transfer pipe, 4-9 parts of second well section well bore,
4-10 parts of first annular space, 4-11 parts of second annular space;
5. a steam return pipeline 6, a pressure power generation device 7, a pressure power generation output pipeline,
8. a thermal power generation input pipeline 9, a flow control valve 10, a thermal power generation device,
11. thermal power generation output pipeline 12 and recovery pipeline.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "bottom", "top", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only terms of relationships determined for convenience in describing structural relationships of the components or elements of the present invention, and do not particularly indicate any components or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "connected" and "connecting" should be interpreted broadly, and mean either a fixed connection or an integral connection or a detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
The invention is further illustrated with reference to the following figures and examples.
Example 1:
as shown in fig. 1, a geothermal resource cleaning and efficient development system comprises a plurality of geothermal single wells 4, wherein each geothermal single well 4 comprises a first well section extending from the ground to a hot dry rock heat insulation layer b, a second well section extending from the hot dry rock heat insulation layer b to a hot dry rock heat insulation layer c and extending transversely along the hot dry rock heat insulation layer c, and the second well sections of the geothermal single wells 4 extend along different directions;
the first well section reaches a dry hot rock heat insulation layer b from the ground through a normal temperature gradient stratum a, as can be seen from fig. 2, most of the first well section is located in the normal temperature gradient stratum a, most of the second well section is located in a dry hot rock c, and two sections of well body structures are intersected in the dry hot rock heat insulation layer b; the well body structure for exploiting the geothermal resources of the dry hot rock is divided into the first well section and the second well section, so that the relative independence of two well drilling and completion processes can be realized, and the intermediate links of the two well drilling and completion construction are effectively connected;
according to the clean and efficient development system for geothermal resources, a plurality of geothermal single wells 4 are drilled in a cluster well mode, namely, on a well site or a platform, the well mouths are concentrated in a limited range, the well mouths of the geothermal single wells 4 are relatively close to each other, and the second well sections of the geothermal single wells 4 extend to different directions according to the specific heat exchange needs of a dry hot rock reservoir; the clean and efficient development system for the geothermal resources can only have one geothermal single well 4 or a plurality of geothermal single wells 4, namely the clean and efficient development system for the geothermal resources can realize the heat recovery process of injecting liquid and exhausting gas in the single geothermal single well 4 or the heat recovery process of injecting liquid and exhausting gas in the plurality of geothermal single wells 44;
as shown in fig. 2, an upper heat insulation production pipe 4-5 is arranged in the first well section along the axial direction of the well section, and a lower heat insulation production pipe 4-7 and a heat conduction and transfer pipe 4-8 which are communicated with each other are sequentially arranged in the second well section along the axial direction of the well section; the upper heat insulation and production pipe 4-5 extends to the ground and is a return channel of the gaseous heat transfer working medium at the first well section, so that the energy loss in the return process of the gaseous heat transfer working medium can be reduced; the lower heat insulation and production pipe 4-7 extends from the inside of the hot dry rock heat insulation layer b to the inside of the hot dry rock c and is an injection passage of the liquid heat transfer working medium in the second well section, so that the heat loss caused by the influence of the low-temperature liquid heat transfer working medium on the high-temperature gaseous heat transfer working medium in the second annular space 4-11 can be reduced; the left side of the heat conduction and heat transfer pipe 4-8 is connected with the lower heat insulation and heat recovery pipe 4-7, horizontally extends rightwards in the hot dry rock c, and is an injection channel of the liquid heat transfer working medium in the second well section, so that the liquid heat transfer working medium can be ensured to exchange sufficient heat in advance; the specific extension lengths of the lower heat insulation and production pipe 4-7 and the heat conduction and transfer pipe 4-8 can be adjusted according to the temperature of the hot dry rock and the heat transfer requirement; a first annulus 4-10 is formed between the upper heat insulation and production pipe 4-5 and the first well section, and the first annulus 4-10 is an injection channel of the liquid heat transfer working medium in the first well section; a second annular space 4-11 is formed among the lower heat insulation heat production pipe 4-7, the heat conduction heat transfer pipe 4-8 and the second well section, the second annular space 4-11 is a channel for vaporizing the liquid heat transfer working medium in the second well section and returning the liquid heat transfer working medium by utilizing the pressure difference generated after vaporization, and the flow channel communication design is favorable for returning the vaporized heat transfer working medium: the injected liquid heat transfer working medium and the vaporized gaseous heat transfer working medium generate pressure difference in the shaft, and the vaporized heat transfer working medium returns under the action of the pressure difference; the upper heat-insulating and heat-collecting pipes 4-5, the lower heat-insulating and heat-collecting pipes 4-7 and the heat-conducting and heat-conducting pipes 4-8 can be replaced in time, so that the whole extraction and construction process of the geothermal resources of the dry hot rock can be adjusted at any time, the damaged pipe column can be replaced in time, and the extraction efficiency is ensured;
the upper heat-insulation and heat-production pipe 4-5 is connected with the lower heat-insulation and heat-production pipe 4-7 through a flow channel variable controller 4-6; the flow channel variable controller 4-6 is used for communicating the first annular space 4-10 with the lower heat insulation heat production pipe 4-7, and the flow channel variable controller 4-6 is used for communicating the second annular space 4-11 with the upper heat insulation heat production pipe 4-5;
the flow channel variable controller 4-6 is positioned in the hot dry rock heat insulation layer b and is used as a junction of the first well section and the second well section, so that the internal and external conversion of the gas-state and liquid-state two-phase flow channels of the heat transfer working medium is realized; the runner variable controller 4-6, the upper heat-insulation heat-production pipe 4-5, the lower heat-insulation heat-production pipe 4-7 and the heat-conduction heat-transfer pipe 4-8 form a heat-production pipe system for collecting heat, and the heat is controlled by the runner variable controller 4-6; the upper heat-insulation heat-production pipe 4-5, the lower heat-insulation heat-production pipe 4-7 and the heat-conduction heat-transfer pipe 4-8 are all positioned in the geothermal single well 4, so that the heat loss in the heat production process is effectively reduced, and the heat production efficiency is greatly improved;
each geothermal single well 4 is connected with a respective liquid distribution pipeline 2 through a respective wellhead device 3, and the liquid distribution pipeline 2 is connected with a liquid distribution station 1; the liquid distribution pipeline 2 is communicated with a first annular space 4-10 in a corresponding geothermal single well 4 through a wellhead device 3; the upper heat-insulating heat-collecting pipes 4-5 of the geothermal single well 4 are communicated with respective steam return pipelines 5 through wellhead devices;
the steam return pipeline 5 is connected with the input end of the pressure power generation device 6, the output end of the pressure power generation device 6 is connected with the pressure power generation output pipeline 7, and all the pressure power generation output pipelines 7 are converged into a pressure output main pipeline. The steam return pipelines 5 convey high-temperature heat transfer working media to the pressure power generation devices 6, the pressure power generation devices 6 convert pressure energy and kinetic energy carried by the steam conveyed from the steam return pipelines 5 into electric energy, and the pressure power generation output pipelines 7 output the electric energy converted by the pressure power generation devices 6 for further utilization.
Preferably, a surface casing 4-1 is sleeved in the first well section, a technical casing 4-3 is arranged in the surface casing 4-1, and a first annulus 4-10 is formed between the upper heat insulation production pipe 4-5 and the technical casing 4-3.
Preferably, a surface cement sheath 4-2 is sealed between one end of the surface casing 4-1 positioned at the top end of the borehole and the borehole, and a surface cement sheath 4-4 is arranged between one end of the technical casing 4-3 positioned in the hot dry rock thermal insulation layer b and the surface casing 4-1.
In the actual construction process, the technical casing 4-3 is one layer or a plurality of layers, and when the technical casing 4-3 is a plurality of layers, the technical casing 4-4 is sealed between the adjacent technical casings 4-3; the application layer number of the technical casing 4-3 is determined according to the actual underground working condition. Wherein, the cement sheath 4-4 of the last layer is higher than the top layer of the hot dry rock thermal insulation layer b. The specific height return is also determined according to underground working conditions.
Wherein the second interval well bore 4-9 is an open hole or a well bore with a support string run in.
Preferably, as shown in fig. 3-7, the flow channel controller 4-6 comprises a cylindrical body 4-6-1 connected with the inner wall surface of the technical casing 4-3, one end of the cylindrical body 4-6-1 is provided with a first connector 4-6-2 for connecting with the upper heat-insulating heating pipe 4-5, and a main reflux channel 4-6-3 communicated with the upper heat-insulating heating pipe 4-5 is arranged in the first connector 4-6-2; the other end of the cylindrical body 4-6-1 is provided with a second joint 4-6-4 used for being connected with a lower heat insulation and production pipe 4-7, and an inflow main channel 4-6-5 communicated with the lower heat insulation and production pipe 4-7 is arranged in the second joint 4-6-4; a plurality of inflow branch channels 4-6-6 communicated with the first annular space 4-10 and the inflow main channel 4-6-5 are uniformly arranged in the cylindrical body 4-6-1 along the circumferential direction; a plurality of backflow branch channels 4-6-7 communicated with the second annular space 4-11 and the backflow main channel 4-6-3 are uniformly arranged in the cylindrical body 4-6-1 along the circumferential direction; the flow-in and flow-out channels 4-6-6 and the backflow and flow-back channels 4-6-7 are arranged in a staggered mode.
In the application, the inflow branch channel 4-6-6 and the backflow branch channel 4-6-7 are both positioned inside the cylindrical body 4-6-1, and the inflow branch channel 4-6-6 and the backflow branch channel 4-6-7 are circumferentially and alternately distributed along the central axis of the cylindrical body 4-6-1, and are not crossed, so that heat transfer is facilitated.
Preferably, a heat insulation sealing assembly 4-6-8 is arranged between the cylindrical body 4-6-1 and the technical casing 4-3, and the heat insulation sealing assembly 4-6-8 can prevent heat loss to the maximum extent and ensure that heat energy is transferred to the ground to the maximum extent.
Preferably, the output end of the pressure power generation device 6 is further connected with the input end of a thermal power generation device 10 through a thermal power generation input pipeline 8, and the output end of the thermal power generation device 10 is connected with a thermal power generation output pipeline 11.
Preferably, the output of the thermal power plant 10 is also connected to the liquid distribution station 1 by means of a recovery line 12.
Preferably, a flow control valve 9 is arranged on the thermal power input pipeline 8.
The thermal power generation input pipeline 8 inputs the high-temperature heat transfer working medium after releasing the pressure energy and the kinetic energy to the thermal power generation device 10, and the flow control valve 9 is used for controlling the flow of the heat transfer working medium of the thermal power generation input pipeline 8; the thermal power generation device 10 converts the thermal energy carried by the steam delivered from each thermal power generation input pipeline 8 into electric energy, and the thermal power generation output pipeline 11 outputs the electric energy converted by the thermal power generation device 10 for further utilization; the recovery pipeline 12 re-transmits the completely utilized heat transfer working medium to the liquid distribution station 1 for the next recycling.
Example 2:
a clean and efficient geothermal resource development method adopting the clean and efficient geothermal resource development system in the embodiment 1 comprises the following steps:
the method comprises the following steps: the low-boiling-point liquid heat transfer working medium is sent into each liquid distribution pipeline 2 from the liquid distribution station 1, flows through each wellhead device 3 and then enters a first annulus 4-10 of the geothermal single well 4;
step two: the liquid heat transfer working medium entering the first annulus 4-10 flows into the lower heat insulation heat collection pipe 4-7 through the inflow branch channel 4-6-6 and the inflow main channel 4-6-5, and then flows through the heat conduction heat transfer pipe 4-8;
step three: the liquid heat transfer working medium flows through the heat transfer heat pipe 4-8 and then enters the second annular space 4-11 for heat exchange and then is vaporized;
step four: the vaporized heat transfer working medium enters the heat insulation heat production pipe 4-5 through the backflow branch channel 4-6-7 and the backflow main channel 4-6-3 by utilizing the pressure difference generated in the vaporized shaft;
step five: the heat transfer working medium vaporized in the inlet heat insulation heat production pipes 4-5 flows into the respective steam return pipelines 5 through the respective wellhead devices 3, the steam return pipelines 5 convey the vaporized heat transfer working medium to the pressure power generation device 6, the pressure power generation device 6 converts the pressure energy and the kinetic energy carried by the steam conveyed from the steam return pipelines 5 into electric energy, and the pressure power generation output pipeline 7 outputs the electric energy converted by the pressure power generation device 6 for further utilization;
step six: the pressure power generation device 6 inputs the high-temperature heat transfer working medium which releases pressure energy and kinetic energy to the thermal power generation device 10 through the thermal power generation input pipeline 8, the thermal power generation device 10 converts the heat energy carried by the steam transmitted from each thermal power generation input pipeline 8 into electric energy, and the thermal power generation output pipeline 11 outputs the electric energy converted by the thermal power generation device 10 for further utilization;
step seven: the recovery pipeline 12 re-delivers the heat transfer working medium which is completely utilized in the thermal power generation device 10 to the liquid distribution station 1 for the next recycling.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the present invention, and it should be understood by those skilled in the art that various modifications and changes may be made without inventive efforts based on the technical solutions of the present invention.
Claims (9)
1. A clean and efficient development system for geothermal resources is characterized by comprising a plurality of geothermal single wells, wherein each geothermal single well comprises a first well section extending from the ground to a hot dry rock heat insulation layer and a second well section extending from the hot dry rock heat insulation layer to a hot dry layer and transversely extending along the hot dry layer; the second well section of each geothermal single well extends along different directions;
an upper heat insulation heat production pipe is arranged in the first well section along the axial direction of the well section, and a lower heat insulation heat production pipe and a heat conduction heat transfer pipe which are communicated are sequentially arranged in the second well section along the axial direction of the well section; a first annulus is formed between the upper heat insulation heat production pipe and the first well section; a second annulus is formed among the lower heat insulation heat production pipe, the heat conduction heat transfer pipe and the second well section;
the upper heat-insulation heat-production pipe and the lower heat-insulation heat-production pipe are connected through a flow channel variable controller; the flow channel variable controller is used for communicating the first annulus with the lower heat insulation heat production pipe, and the flow channel variable controller is used for communicating the second annulus with the upper heat insulation heat production pipe;
each geothermal single well is connected with a respective liquid distribution pipeline through a respective wellhead device, and the liquid distribution pipeline is connected with a liquid distribution station; the liquid distribution pipeline is communicated with a first annular space in the corresponding geothermal single well through a wellhead device; the upper heat-insulating heat recovery pipe of the geothermal single well is communicated with respective steam return pipelines through a wellhead device;
the steam return pipeline is connected with the input end of the pressure power generation device, the output end of the pressure power generation device is connected with the pressure power generation output pipeline, and all the pressure power generation output pipelines are converged into a pressure output main pipeline.
2. The clean and efficient geothermal resource development system of claim 1, wherein the first interval is lined with a surface casing, a technical casing is arranged in the surface casing, and a first annulus is formed between the upper thermal insulation production pipe and the technical casing.
3. The clean and efficient geothermal resource development system as claimed in claim 2, wherein a surface cement sheath is sealed between one end of the surface casing pipe positioned at the top end of the borehole and the borehole, and a technical cement sheath is arranged between one end of the technical casing pipe positioned in the hot dry rock heat insulation layer and the surface casing pipe.
4. The clean and efficient geothermal resource development system of claim 3, wherein the flow channel controller comprises a cylindrical body connected with the inner wall surface of the technical casing, one end of the cylindrical body is provided with a first joint for connecting with the upper heat insulation and production pipe, and a main return channel communicated with the upper heat insulation and production pipe is arranged in the first joint; the other end of the cylindrical body is provided with a second joint used for being connected with the lower heat insulation and production pipe, and an inflow main channel communicated with the lower heat insulation and production pipe is arranged in the second joint; a plurality of inflow branch channels communicated with the first annular space and the inflow main channel are uniformly arranged in the cylindrical body along the circumferential direction; a plurality of backflow branch channels communicated with the second annular space and the backflow main channel are uniformly arranged in the cylindrical body along the circumferential direction; the inflow sub-channels and the backflow sub-channels are arranged in a staggered mode.
5. The clean and efficient geothermal resource development system of claim 4, wherein a heat insulation seal assembly is arranged between the cylindrical body and the technical casing.
6. The clean and efficient geothermal resource development system of claim 1, wherein the output of the pressure power generation device is further connected to the input of the thermal power generation device via a thermal power input line, and the output of the thermal power generation device is connected to a thermal power output line.
7. The clean and efficient geothermal resource development system of claim 6, wherein the output of the thermal power plant is further connected to a distribution station via a recovery pipeline.
8. The clean and efficient geothermal resource development system of claim 7, wherein the thermal power generation input line is provided with a flow control valve.
9. A clean and efficient development method for geothermal resources, which is characterized in that the clean and efficient development system for geothermal resources according to any one of claims 1 to 8 is used, and comprises the following steps:
the method comprises the following steps: the low-boiling-point liquid heat transfer working medium is sent into each liquid distribution pipeline from the liquid distribution station, flows through each wellhead device and then enters a first annulus of the geothermal single well;
step two: the liquid heat transfer working medium entering the first annulus flows into the lower heat insulation heat production pipe through the inflow branch channel and the inflow main channel and then flows through the heat conduction heat transfer pipe;
step three: the liquid heat transfer working medium flows through the heat transfer pipe and then enters the second annular space for heat exchange and then is vaporized;
step four: the vaporized heat transfer working medium enters the heat insulation heat production pipe through the reflux branch channel and the reflux main channel by utilizing the pressure difference generated in the vaporized shaft;
step five: the heat transfer working medium vaporized in the inlet heat insulation heat production pipe flows into respective steam return pipelines through respective wellhead devices, the steam return pipelines convey the vaporized heat transfer working medium to the pressure power generation device, the pressure power generation device converts pressure energy and kinetic energy carried by the steam conveyed from the steam return pipelines into electric energy, and the pressure power generation output pipelines output the electric energy converted by the pressure power generation devices for further utilization;
step six: the pressure power generation device inputs the high-temperature heat transfer working medium which releases pressure energy and kinetic energy to the thermal power generation device through the thermal power generation input pipeline, the thermal power generation device converts the heat energy carried by the steam transmitted from each thermal power generation input pipeline into electric energy, and the thermal power generation output pipeline outputs the electric energy converted by the thermal power generation device for further utilization;
step seven: the recovery pipeline conveys the heat transfer working medium which is completely utilized in the thermal power generation device to the liquid distribution station again for next recycling.
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