Geothermal resource injection-production cyclic utilization method and device in same well

Abstract

The invention provides a geothermal resource same-well injection-production cyclic utilization method and device, and relates to the field of geothermal resource same-well injection-production circulation. The same-well injection-production cyclic utilization method for the geothermal resources comprises the steps that a, a well is drilled in a designated place to obtain underground heat energy resources, b, a heat energy recovery device is installed and used for extracting heat energy from underground water, and c, the underground water flow and the geothermal energy transmission process are monitored through a sensor and a control system. Through accurate groundwater flow monitoring and real-time adjustment of operation parameters of the heat energy recovery device, the heat energy recovery efficiency can be maximized, and the possible groundwater pollution risk can be effectively predicted and evaluated based on geological feature analysis and groundwater flow simulation, so that targeted prevention measures are taken, the environmental influence is reduced, and the economic benefit is improved. And during operation of the system, land surface coverage and heat energy release control measures are adopted, so that the adverse effect on the surrounding environment is effectively reduced, and the sustainability and the environmental protection property of the system are further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of geothermal resource injection-production cycle in the same well, and in particular to a method and device for geothermal resource injection-production cycle in the same well. Background Art

[0002] The geothermal resource injection and extraction recycling method is an innovative technology that uses the heat energy in underground rocks to provide energy. The method first uses underground hot water or steam to inject through the well pipe to bring the heat energy to the surface. Once the heat energy is extracted to the surface, it can be used for a variety of purposes, such as heating, power generation, or heat energy needs in industrial processes. Then, by injecting the cooled water or steam back into the ground again, a circulation system is formed. This recycling method not only reduces energy waste, but also helps to protect groundwater resources and reduce the impact on the surface environment.

[0003] Although the method of recycling geothermal resources by injection and production in the same well has significant environmental and energy efficiency advantages, it also has some defects that need to be addressed. Geological conditions have a great impact on the efficiency of the system. The distribution of geothermal resources and the injection and production effects of wells in different regions vary greatly, and they need to be designed and optimized according to local conditions. One of them is the complexity of the technology and the challenge of operation. Due to the need to precisely control the groundwater flow and heat energy transfer process, operators need a high degree of professional knowledge and skills. This increases the complexity of system operation and maintenance, which may lead to the risk of increased failure rate and reduced efficiency. Although the utilization of geothermal resources is a form of clean energy, improper operation or changes in the geological environment may lead to environmental problems such as groundwater pollution or surface heat island effect. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the shortcomings of the prior art, the present invention provides a method and device for recycling geothermal resources by injection and extraction in the same well, which solves the problem that geological conditions have a great influence on the efficiency of the system, and the distribution of geothermal resources and the injection and extraction effects of wells in different regions are very different; because of the need to accurately control the groundwater flow and heat energy transmission process, operators need a high degree of professional knowledge and skills. This increases the complexity of system operation and maintenance, which may lead to the risk of increased failure rate and reduced efficiency; although the utilization of geothermal resources is a form of clean energy, improper operation or changes in the geological environment may lead to environmental problems such as groundwater pollution or surface heat island effect.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for recycling geothermal resources by injection and production in the same well, comprising:

[0008] a. Conduct detailed geological surveys and environmental impact assessments before drilling to determine the possible pollution risks to groundwater resources during the drilling process and formulate corresponding preventive measures;

[0009] b. Use environmentally friendly materials during installation to ensure the tightness of the equipment and avoid groundwater pollution. At the same time, design a drainage system to prevent sewage leakage during construction;

[0010] c. Add a water quality monitoring system to monitor the chemical composition and pollutant content in groundwater in real time to ensure that the heat extraction process will not cause water quality degradation or pollution;

[0011] d. In addition to heat recovery parameters, pollution monitoring data is added to automatically adjust operating parameters to reduce potential environmental impacts when necessary, such as reducing the extraction rate or pausing the extraction process;

[0012] e. During the application process, ensure that the temperature and quality of the return water meet environmental standards to avoid damage to the groundwater system;

[0013] f. Incorporate pollution risk assessment as part of the optimization model to ensure long-term stability of water quality and heat transfer, and make dynamic adjustments based on real-time monitoring data;

[0014] g. Strengthen the maintenance of the pollution monitoring system, regularly check the status of sensors and equipment, and ensure that groundwater monitoring equipment continues to work accurately;

[0015] h. In addition to analyzing heat transfer data, water quality data should also be recorded and analyzed to assess possible signs of contamination and predict future contamination risks based on trends;

[0016] i. When deploying or adjusting equipment, take groundwater contamination risks into account, assess changes in water quality under different geological structures, and design corresponding response strategies;

[0017] j. When the monitoring system detects a potential pollution risk, it automatically triggers an emergency stop operation and takes anti-pollution measures, such as plugging leaks or adjusting water flow paths;

[0018] k. Establish a groundwater pollution risk assessment model, and predict future pollution risks by regularly analyzing historical data and geological data. Optimize the system's operating parameters and maintenance strategies based on the assessment results;

[0019] l. Take preventive measures to reduce environmental impact during system maintenance and operation.

[0020] Preferably, the heat recovery device adjusts operating parameters according to the method of groundwater fluidity and geological characteristics, monitors groundwater flow rate and temperature through sensors and control systems, and adjusts operating parameters of the heat exchanger, such as flow rate and heat exchange area, in real time to maximize heat recovery efficiency.

[0021] Preferably, the groundwater flow estimation formula is:

[0022] m=A·υ

[0023] Where m is the groundwater flow rate, A is the groundwater cross-sectional area, and v is the groundwater velocity.

[0024] Preferably, the geothermal energy heat transfer formula is:

[0025]

[0026] where Q is the heat energy extracted from groundwater, m˙ is the groundwater mass flow rate, cp is the specific heat capacity of water, and Tout and Tin are the temperatures of the groundwater outlet and inlet, respectively.

[0027] Preferably, the system performance evaluation index formula is:

[0028]

[0029] Among them, Pperformance is the performance evaluation index of the system, Eoutput is the energy output by the system, and Einput is the energy input by the system.

[0030] Preferably, the groundwater pollution risk assessment model is a pollution risk assessment model based on geological characteristics and groundwater fluidity, taking into account the concentration changes and movement paths of dissolved substances in groundwater to predict possible pollution impacts. The groundwater pollution risk assessment model is implemented by the following steps:

[0031] Geological characterization: Detailed analysis of the geological rock formations in which the wells are drilled, including an understanding of permeability, pore structure, and groundwater movement pathways.

[0032] Groundwater flow simulation: Based on geological characteristics and field monitoring data, a groundwater flow model is established, which takes into account the groundwater flow velocity, direction and the concentration distribution of dissolved substances in pore water.

[0033] Dissolved matter transport simulation: Numerical simulation techniques are used to simulate the transport process of dissolved matter in groundwater. These simulation results are used to predict changes in groundwater quality and their possible impacts on the environment.

[0034] Risk assessment and prediction: Combine groundwater flow models and dissolved matter transport simulations to assess the risk of groundwater contamination that may occur during system operation.

[0035] Preferably, the environmental impact reduction technology includes surface covering and heat energy release control measures when the system is in operation to reduce the impact on the surrounding environment. The environmental impact reduction technology includes arranging lawns or low-reflectivity surface materials around geothermal resource extraction facilities to reduce the formation of surface heat island effect.

[0036] A geothermal resource same-well injection and production recycling device, comprising:

[0037] Geothermal Well: A well designed to access geothermal resources underground and of sufficient depth and diameter to accommodate heat recovery equipment.

[0038] Heat recovery device: installed in the geothermal well to extract heat energy from groundwater, including heat exchangers, heat exchange pipes and heat transfer media.

[0039] Sensors and control systems: A network of sensors to monitor groundwater flow and geothermal energy transfer processes, and an automated control system to adjust the operating parameters of the heat recovery device in real time.

[0040] Operation interface: provides an interface for operators to interact with the system, displays real-time data and system status, and allows manual adjustment of operating parameters.

[0041] Environmental protection facilities: including surface covering materials and heat release control devices, used to reduce the impact of system operation on the surrounding environment.

[0042] Data recording and analysis system: Record and analyze data on groundwater flow and thermal energy transfer to support system performance evaluation, maintenance and optimization decisions.

[0043] Preventive measures system: including leakage monitoring devices and environmental monitoring systems to prevent groundwater contamination and other environmental problems.

[0044] Emergency Response System: An automated emergency response mechanism that adjusts operations based on real-time monitoring data to ensure safe and stable operation of the system in emergency situations.

[0045] (III) Beneficial effects

[0046] The present invention provides a method and device for recycling geothermal resources by injection and production in the same well. It has the following beneficial effects:

[0047] Through precise groundwater flow monitoring and real-time adjustment of the operating parameters of the heat recovery device, the heat recovery efficiency can be maximized. Based on the analysis of geological characteristics and groundwater flow simulation, the possible groundwater pollution risks can be effectively predicted and evaluated, so that targeted preventive measures can be taken to reduce environmental impacts. The surface cover and heat release control measures adopted during system operation effectively reduce the adverse effects on the surrounding environment and further enhance the sustainability and environmental friendliness of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic diagram of the heat recovery device of the present invention;

[0049] Figure 2 This is a schematic diagram of another heat recovery device of the present invention;

[0050] Figure 3 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] like Figure 1-3 As shown, an embodiment of the present invention provides a method for recycling geothermal resources by injection and production in the same well, comprising:

[0053] a. Drilling wells at designated locations to obtain underground thermal energy resources.

[0054] b. Install a heat recovery device for extracting heat energy from groundwater, wherein the heat recovery device adjusts operating parameters according to the fluidity and geological characteristics of the groundwater, monitors the groundwater flow rate and temperature through sensors and control systems, and adjusts the operating parameters of the heat exchanger, such as flow rate and heat exchange area, in real time to maximize the heat recovery efficiency.

[0055] c. Monitoring groundwater flow and geothermal energy transmission process through sensors and control systems, the groundwater flow estimation formula is:

[0056] m=A·υ

[0057] Where m is the groundwater flow rate, A is the groundwater cross-sectional area, and v is the groundwater velocity.

[0058] d. Adjust the operating parameters of the heat recovery device based on the monitoring data.

[0059] e. Apply the extracted heat energy to target applications such as heating or power generation, the geothermal heat transfer formula is:

[0060]

[0061] Where Q is the heat energy extracted from groundwater; m˙ is the groundwater mass flow rate, cp is the specific heat capacity of water, and Tout and Tin are the temperatures of the groundwater outlet and inlet, respectively.

[0062] f. Operate the system to maintain the optimized state of groundwater flow and heat energy transmission, the system performance evaluation index formula is:

[0063]

[0064] Among them, Pperformance is the performance evaluation index of the system, Eoutput is the energy output by the system, and Einput is the energy input by the system.

[0065] g. Perform regular maintenance and calibration on the system to ensure efficient operation.

[0066] h. Record and analyze groundwater flow and heat transfer data during system operation.

[0067] i. Adjust the deployment and operation strategy of heat recovery devices according to geological conditions.

[0068] j. Conduct emergency response through system automation control.

[0069] 6. k. Regularly evaluate system performance and make necessary upgrades or adjustments, and establish a groundwater pollution risk assessment model, which is based on the pollution risk assessment model of geological characteristics and groundwater fluidity, taking into account the concentration changes and movement paths of dissolved substances in groundwater, and predicting possible pollution impacts. The groundwater pollution risk assessment model is implemented through the following steps:

[0070] Geological characterization: Detailed analysis of the geological rock formations in which the wells are drilled, including an understanding of permeability, pore structure, and groundwater movement pathways.

[0071] Groundwater flow simulation: Based on geological characteristics and field monitoring data, a groundwater flow model is established, which takes into account the groundwater flow velocity, direction and the concentration distribution of dissolved substances in pore water.

[0072] Dissolved matter transport simulation: Numerical simulation techniques are used to simulate the transport process of dissolved matter in groundwater. These simulation results are used to predict changes in groundwater quality and their possible impacts on the environment.

[0073] Risk assessment and prediction: Combine groundwater flow models and dissolved matter transport simulations to assess the risk of groundwater contamination that may occur during system operation, and develop preventive measures based on the prediction results to reduce potential environmental impacts.

[0074] l. Take preventive measures to reduce environmental impact during system maintenance and operation. The environmental impact reduction technology includes ground covering and heat release control measures during system operation to reduce the impact on the surrounding environment. The environmental impact reduction technology includes arranging lawns or low-reflectivity surface materials around geothermal resource extraction facilities to reduce the formation of surface heat island effect.

[0075] A geothermal resource same-well injection and production recycling device, comprising:

[0076] Geothermal Well: A well designed to access geothermal resources underground and of sufficient depth and diameter to accommodate heat recovery equipment.

[0077] Heat recovery device: installed in the geothermal well to extract heat energy from groundwater, including heat exchangers, heat exchange pipes and heat transfer media.

[0078] Sensors and control systems: A network of sensors to monitor groundwater flow and geothermal energy transfer processes, and an automated control system to adjust the operating parameters of the heat recovery device in real time.

[0079] Operation interface: provides an interface for operators to interact with the system, displays real-time data and system status, and allows manual adjustment of operating parameters.

[0080] Environmental protection facilities: including surface covering materials and heat release control devices, used to reduce the impact of system operation on the surrounding environment.

[0081] Data recording and analysis system: Record and analyze data on groundwater flow and thermal energy transfer to support system performance evaluation, maintenance and optimization decisions.

[0082] Preventive measures system: including leakage monitoring devices and environmental monitoring systems to prevent groundwater contamination and other environmental problems.

[0083] Emergency Response System: An automated emergency response mechanism that adjusts operations based on real-time monitoring data to ensure safe and stable operation of the system in emergency situations.

[0084] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for recycling geothermal resources by injection and production in the same well, characterized in that: include: a. Conduct detailed geological surveys and environmental impact assessments before drilling to determine the possible pollution risks to groundwater resources during the drilling process and formulate corresponding preventive measures; b. Use environmentally friendly materials during installation to ensure the tightness of the equipment and avoid groundwater pollution. At the same time, design a drainage system to prevent sewage leakage during construction; c. Add a water quality monitoring system to monitor the chemical composition and pollutant content in groundwater in real time to ensure that the heat extraction process will not cause water quality degradation or pollution; d. In addition to heat recovery parameters, pollution monitoring data is added to automatically adjust operating parameters to reduce potential environmental impacts when necessary, such as reducing the extraction rate or pausing the extraction process; e. During the application process, ensure that the temperature and quality of the return water meet environmental standards to avoid damage to the groundwater system; f. Incorporate pollution risk assessment as part of the optimization model to ensure long-term stability of water quality and heat transfer, and make dynamic adjustments based on real-time monitoring data; g. Strengthen the maintenance of the pollution monitoring system, regularly check the status of sensors and equipment, and ensure that groundwater monitoring equipment continues to work accurately; h. In addition to analyzing heat transfer data, water quality data should also be recorded and analyzed to assess possible signs of contamination and predict future contamination risks based on trends; i. When deploying or adjusting equipment, take groundwater contamination risks into account, assess changes in water quality under different geological structures, and design corresponding response strategies; j. When the monitoring system detects a potential pollution risk, it automatically triggers an emergency stop operation and takes anti-pollution measures, such as plugging leaks or adjusting water flow paths; k. Establish a groundwater pollution risk assessment model, and predict future pollution risks by regularly analyzing historical data and geological data. Optimize the system's operating parameters and maintenance strategies based on the assessment results; l. Take preventive measures to reduce environmental impact during system maintenance and operation.

2. A method for recycling geothermal resources by injection and production in the same well according to claim 1, characterized in that: The method for adjusting operating parameters of the heat recovery device according to groundwater fluidity and geological characteristics monitors groundwater flow rate and temperature through sensors and control systems, and adjusts operating parameters of the heat exchanger, such as flow rate and heat exchange area, in real time to maximize heat recovery efficiency.

3. A method for recycling geothermal resources by injection and production in the same well according to claim 1, characterized in that: The groundwater flow estimation formula is: m=A·v Where m is the groundwater flow rate, A is the groundwater cross-sectional area, and v is the groundwater velocity.

4. A method for recycling geothermal resources by injection and production in the same well according to claim 1, characterized in that: The geothermal heat transfer formula: Where Q is the heat energy extracted from groundwater; m˙ is the groundwater mass flow rate, cp is the specific heat capacity of water, and Tout and Tin are the temperatures of the groundwater outlet and inlet, respectively.

5. A method for recycling geothermal resources by injection and production in the same well according to claim 1, characterized in that: The system performance evaluation index formula is: Among them, Pperformance is the performance evaluation index of the system, Eoutput is the energy output by the system, and Einput is the energy input by the system.

6. A method for recycling geothermal resources by injection and production in the same well according to claim 1, characterized in that: The groundwater pollution risk assessment model is a pollution risk assessment model based on geological characteristics and groundwater fluidity, taking into account the concentration changes and movement paths of dissolved substances in groundwater to predict possible pollution impacts.

7. A method for recycling geothermal resources by injection and production in the same well according to claim 1, characterized in that: The environmental impact reduction technology includes surface covering and heat energy release control measures during system operation to reduce the impact on the surrounding environment. The environmental impact reduction technology includes arranging lawns or low-reflectivity surface materials around geothermal resource extraction facilities to reduce the formation of surface heat island effect.

8. A geothermal resource injection and production recycling device, characterized in that: include: Geothermal Well: A well designed to access geothermal resources underground and of sufficient depth and diameter to accommodate heat recovery equipment. Heat recovery device: installed in the geothermal well to extract heat energy from groundwater, including heat exchangers, heat exchange pipes and heat transfer media. Sensors and control systems: A network of sensors to monitor groundwater flow and geothermal energy transfer processes, and an automated control system to adjust the operating parameters of the heat recovery device in real time. Operation interface: provides an interface for operators to interact with the system, displays real-time data and system status, and allows manual adjustment of operating parameters. Environmental protection facilities: including surface covering materials and heat release control devices, used to reduce the impact of system operation on the surrounding environment. Data recording and analysis system: Record and analyze data on groundwater flow and thermal energy transfer to support system performance evaluation, maintenance and optimization decisions. Preventive measures system: including leakage monitoring devices and environmental monitoring systems to prevent groundwater contamination and other environmental problems. Emergency Response System: An automated emergency response mechanism that adjusts operations based on real-time monitoring data to ensure safe and stable operation of the system in emergency situations.

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