Coal and oil shale oil and gas resource co-mining system and method

Abstract

The invention discloses a coal and oil shale oil gas resource co-mining system and method. According to the system, an injection device comprises a pressurizing direct flow pipe, a feeding pipe and a mixer; the pressurizing direct flow pipe is connected with the injection well; the feeding pipe and the mixer are connected to the pressurizing direct flow pipe; the gasifying agent adjusting device comprises a flow adjusting valve and a flow meter; the flow regulating valve is connected in series to the pressurizing direct flow pipe; a separation device in the extraction assembly is connected with an extraction well; the three-dimensional geological monitor is arranged on the earth surface; the temperature probe is mounted on the side wall of the production well; the pressure probe is mounted on the side wall of the injection well; a product meter in the collection assembly is connected with a separation device; the method comprises the steps that high-temperature water vapor and pure oxygen are mixed through a mixer to form a gasifying agent, then the gasifying agent is injected into a coal seam goaf, the gasifying agent and residual coal are subjected to a combustion reaction to generate high-temperature coal gas, the high-temperature coal gas and overlying oil shale are subjected to a pyrolytic reaction to generate an oil-gas mixture, and the oil-gas mixture is extracted to the earth surface to be separated. By means of the system and method, efficient and green co-mining of coal and oil shale can be achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of co-production of coal and oil shale oil and gas resources, and in particular relates to a system and method for co-production of coal and oil shale oil and gas resources. Background Art

[0002] As an unconventional oil and gas resource, oil shale is listed as one of the important alternative energy sources in the 21st century due to its rich resources and exploitable characteristics. The scope of oil shale development and utilization is very wide. In addition to developing high-quality fuels such as shale oil and gas, it can also be applied to various engineering fields such as manufacturing cement, producing chemicals, synthesizing building materials, and developing soil fertilizer agents.

[0003] The traditional method of extracting oil shale is the surface distillation method, which uses well mining to extract oil shale from underground. After the oil shale is transported to the surface, it is processed by low-temperature distillation to produce oil shale oil or generate electricity by burning. Although this traditional mining method is relatively mature in technology, its shortcomings cannot be ignored. The surface distillation method will produce a large amount of waste residue in the process of extracting oil shale oil. At the same time, there are problems such as great difficulty in deep mining, low mining efficiency, and easy pollution of the environment.

[0004] In view of the resource occurrence characteristics of oil shale ore layers in my country, which are often interbedded with coal seams, the idea of ​​joint mining of coal and oil shale has been formed. In order to solve the problem of full utilization of coal resources left after the initial mining of coal resources, and the problem of efficient extraction of oil and gas resources from co-existing oil shale, it is urgent to provide a new type of coal and oil shale oil and gas resource co-mining system and method to realize the scientific and environmentally friendly joint mining of coal and oil shale oil and gas resources. Summary of the invention

[0005] In view of the problems existing in the above-mentioned prior art, the present invention provides a system and method for the co-production of coal and oil shale oil and gas resources. The system can realize the efficient and green co-production of coal and oil shale, which can make the residual coal seam resources be reused underground, avoid environmental pollution during the mining process, and significantly improve the mining efficiency of oil and gas resources in oil shale while saving resources. The implementation process of the method is simple and the implementation cost is low. It can significantly improve the mining efficiency of oil and gas in the overlying oil shale. The whole mining process is carried out underground, and the environmental pollution is extremely small. It provides a low-carbon, green, efficient and convenient new way for the co-production of coal and oil shale oil and gas resources in my country.

[0006] The present invention provides a system for the co-production of coal and oil shale oil and gas resources, comprising a production well group, a gasification component, an extraction component, a geological monitoring component, a collection component and a terminal control device; The production well group includes an injection well and a production well. The injection well is vertically arranged in the target production area, a sleeve is installed inside the injection well, the outlet end of the injection well extends to the coal seam goaf, and the inlet end of the production well is located on the ground surface; the production well is vertically arranged in the target production area at a set distance from the injection well, a sleeve is installed inside the production well, the inlet end of the production well extends to the top of the fracture zone in the overlying oil shale, and the outlet end of the production well is located on the ground surface; The gasification assembly includes an injection device and a gasification agent regulating device; the injection device includes a boosted DC pipe, a feeding pipe and a mixer; the outlet end of the boosted DC pipe is inserted into a sleeve at the inlet end of the injection well; the outlet end of the feeding pipe is fixedly connected to one side of the upper section of the boosted DC pipe, and is communicated with the inner cavity of the boosted DC pipe; the rotating unit of the mixer is rotatably arranged in the inner cavity of the middle section of the boosted DC pipe, and the driving part of the mixer is installed on the outer side wall of the boosted DC pipe, and is used to drive the rotating unit to rotate; the gasification agent regulating device includes a flow regulating valve and a flow meter; the flow regulating valve is serially connected to the boosted DC pipe, and is located between the outlet end of the feeding pipe and the rotating unit of the mixer; the flow meter is installed on the valve body of the flow regulating valve, and is communicated with the valve cavity of the flow regulating valve, and is used to collect the injection flow signal in real time; The extraction assembly includes a separation device, the inlet end of which is connected to the sleeve at the outlet end of the production well, and is used to separate the oil and gas mixture discharged from the production well; The geological monitoring component includes a three-dimensional geological monitoring instrument, a temperature probe, a pressure probe and a numerical calculation platform; the three-dimensional geological monitoring instrument is arranged on the surface of the target mining area; the temperature probe is installed on the side wall of the inlet end of the production well to collect temperature signals; the pressure probe is installed on the side wall of the outlet end of the injection well to collect pressure signals; the numerical calculation platform is arranged on the surface, and is respectively connected to the flow meter, the three-dimensional geological monitoring instrument, the temperature probe and the pressure probe; The collection component includes a product meter, which is connected to the separation device and the numerical calculation platform respectively, and is used to collect the flow signal of the target product in real time; The terminal control device is respectively connected with the driving part of the mixer, the separation device, the flow regulating valve and the numerical calculation platform.

[0007] As a preferred embodiment, the terminal control device and the numerical calculation platform are both industrial computers. Using industrial computers for data processing and numerical calculation analysis can make the transmission process of data acquisition instructions more convenient and efficient, which is conducive to improving the reliability of the system.

[0008] Furthermore, in order to increase the permeability of the oil shale layer in the area not disturbed by coal mining by pre-fracturing, so as to realize full and efficient exploitation of oil and gas resources, the exploitation well group also includes a fracturing well, which is vertically arranged in the target exploitation area, and has a sleeve installed inside. The outlet end of the fracturing well extends to the area in the overlying oil shale layer not disturbed by coal mining, and the inlet end is located on the surface.

[0009] Furthermore, in order to more effectively ensure the high efficiency of residual coal mining and utilization and prevent the shortage of residual coal gasification resources, the target mining area has coal pillars on both sides of the coal seam goaf. In this way, the coal gasification process can recover a large amount of residual coal pillars, and then a large amount of difficult-to-mine residual coal pillar coal resources can be mined.

[0010] Furthermore, in order to form a gasifying agent that is beneficial to the gasification of residual coal by supplying high-temperature water vapor and pure oxygen, the inlet end of the booster direct current pipe is connected to a high-temperature water vapor supply source, and the inlet end of the feeding pipe is connected to a pure oxygen supply source.

[0011] In the present invention, the lower end of the injection well is extended to the coal seam goaf, and a sleeve is inserted therein, so that the injection well can be used to inject a gasifier into the coal seam goaf, and the gasifier can be used to cause the residual coal in the coal seam goaf to undergo a combustion reaction and gasify into high-temperature coal gas. Furthermore, the high-temperature coal gas and the gasifier will flow through the fissures to the position of the overlying oil shale under the influence of the three-zone effect fissures of coal seam mining, and will undergo a pyrolysis reaction with the overlying oil shale to generate an oil-gas mixture. The lower end of the production well is extended to the top of the overlying oil shale fracture zone, and a sleeve is inserted therein, so that the oil-gas mixture can be conveniently used to flow to the low-pressure zone, and the oil-gas mixture can be diverted to the surface through the production well to realize the production of the oil-gas mixture. This arrangement of the production well group can directly and efficiently connect the coal seam goaf, the overlying oil shale, and the gasification assembly and separation device located on the surface, which can effectively save engineering costs and is conducive to improving the inflow efficiency and production efficiency. Connecting a gasification component at the inlet end of the injection well, and making the injection device in the gasification component have a booster direct current pipe and a feeding pipe that are interconnected, can facilitate the use of the booster direct current pipe and the feeding pipe to respectively carry out the filling operation of high-pressure water vapor and pure oxygen. The injection device is provided with a mixer, which can facilitate the use of the mixer to efficiently mix the injected high-pressure water vapor and pure oxygen, thereby forming a gasifier with a better effect, which is conducive to accelerating the reaction process of the gasifier and the residual coal. Connecting a gasifier regulating device in the injection device can facilitate the adjustment of the injection flow of the gasifier. By setting a flowmeter on the flow regulating valve, it is convenient to collect the flow signal of the injected gasifier in real time, and then the flow data of the injected gasifier can be obtained. Therefore, it is convenient for the numerical calculation platform and the terminal control device to feedback control the flow regulating valve according to the flow data of the injected gasifier, so that the injection process of the gasifier can be more accurately controlled and high-speed. Connecting a separation device at the outlet of the production well can facilitate the separation and processing of oil and gas products directly at the wellhead of the production well, which is conducive to reducing the intermediate transportation links and improving the operation efficiency. Through the setting of the three-dimensional geological monitoring instrument, it is convenient to collect seismic signals on the surface, which is conducive to the subsequent numerical calculation platform to accurately analyze the geological structure below the target mining area according to the seismic signals, so as to efficiently and accurately determine the coal seam goaf area and the area where the three-zone effect fractures of coal seam mining are located, so that the drilling position of the production well group can be quickly and accurately determined. By burying a temperature sensor on the side wall of the inlet end of the production well, it is convenient to collect the temperature signal near the inlet end of the production well in real time, and then it is convenient to obtain the temperature data of the oil and gas mixture according to the temperature signal. According to the temperature data, it is helpful to accurately judge whether the pyrolysis reaction is sufficient. At the same time, the temperature data can be used as feedback data, which is convenient for the terminal control device to better adjust the valve opening of the flow control valve.By embedding a pressure sensor on the side wall of the outlet end of the injection well, it is convenient to collect the pressure signal near the outlet end of the injection well in real time, and then it is convenient to obtain the pressure data of the coal seam goaf area according to the pressure signal. According to the pressure data, it is helpful to accurately judge the combustion reaction in the coal seam goaf area. At the same time, the pressure data can be used as feedback data to facilitate the terminal control device to better adjust the valve opening of the flow control valve. Connecting the product meter with the separation device can facilitate the real-time collection of the flow signal of the target product, and then it is convenient for the numerical calculation platform to obtain the flow data of the product according to the flow signal of the product, and the input parameters can be predicted with the flow data as feedback data, and finally the terminal control device can accurately adjust the flow control valve to fully improve the yield of oil products and gas products. The terminal control device is connected to the mixer, separation device, flow control valve and numerical calculation platform respectively, and the terminal control device can be used as the central control unit of the entire system, and is responsible for the operation and control of each part. Through intelligent regulation, efficient management of the oil and gas resource development process can be achieved, and production efficiency can be significantly improved.

[0012] The system can make secondary use of the remaining coal seam resources underground, and the entire mining process is basically carried out underground, avoiding environmental pollution. At the same time, the system can form overlying rock fracture zones by utilizing coal seam mining, increase the fracture conductivity and pyrolysis reaction area of ​​the overlying oil shale layer, and the pyrolysis reaction increases the permeability of the oil shale, realizing a more comprehensive mining process for oil and gas resources. While saving resources, it also significantly improves the mining efficiency of oil and gas resources in the oil shale layer, achieving the goal of efficient and green co-mining of coal and oil shale.

[0013] The present invention also provides a method for co-mining coal and oil shale oil and gas resources, using a system for co-mining coal and oil shale oil and gas resources, comprising the following steps: Step 1: First determine the target mining area, then start drilling vertically from the upper surface corresponding to the target mining area toward the coal seam goaf area, the number of drill holes is at least two, among which at least one drill hole extends into the coal seam goaf area, and is used as an injection well after a suitable casing is placed, and at least one drill hole extends into the overlying oil shale layer under the influence of the three-zone effect fracture of coal seam mining, and is used as a production well after a suitable casing is placed; Step 2: embed a pressure probe on the side wall of the injection well outlet, and embed a temperature probe on the side wall of the production well inlet; insert the outlet end of the booster direct current pipe in the gasification assembly into the sleeve at the injection well inlet; connect the inlet end of the separation device in the extraction assembly with the outlet end of the production well; Establish the connection between the product meter and the separation device; respectively establish the connection between the numerical calculation platform and the flow meter, product meter, temperature probe and pressure probe; respectively establish the connection between the terminal control device and the driving part of the mixer, the separation device, the flow control valve and the numerical calculation platform; Step 3: Connect the high-temperature steam supply source to the inlet end of the booster direct current pipe, connect the pure oxygen supply source to the inlet end of the feeding pipe, and simultaneously supply high-temperature steam and pure oxygen to the gasification component, and control the supply flow of the high-temperature steam supply source and the pure oxygen supply source respectively according to the set flow ratio; At the same time, the drive part of the mixer is controlled by the terminal control device to start working, and the mixer is used to fully mix the high-temperature water vapor and pure oxygen to form a gasifying agent. At the same time, the gasifying agent is injected into the injection well at a high speed by the pressurization effect of the mixer, and is transported to the coal seam goaf through the injection well; the gasifying agent is used to react with the residual coal in the coal seam goaf to gasify the residual coal into high-temperature coal gas. In this process, the coal gangue in the coal seam goaf is used to maintain the stability and conductivity of the pore fracture structure in the coal seam goaf, and promote a more complete combustion process; Step 4: Continue to inject the gasification agent to continue the gasification process of the residual coal to the high-temperature coal gas. At the same time, the high-temperature coal gas generated is driven to the overlying oil shale along the cracks in the coal seam goaf by using the continuously increasing gasification agent, and after contacting with the overlying oil shale, a pyrolysis reaction occurs to generate an oil-gas mixture. In this process, the influence of the three-zone effect cracks of coal seam mining on the overlying oil shale is used to increase the permeability of the overlying oil shale. At the same time, the pyrolysis process is used to increase the permeability of the overlying oil shale, and the increased permeability is used to reversely promote a more complete pyrolysis process. At the same time, the increasing high-temperature coal gas and pyrolysis oil and gas are used to force the oil and gas mixture to flow from the cracks in the overlying oil shale to the low-pressure area; Step 5: Using negative pressure, the oil-gas mixture flows out through the cracks in the overlying oil shale and enters the outlet of the production well, and then is extracted from underground through the production well and injected into the separation device; the separation device is used to separate the oil-gas mixture to obtain the target product.

[0014] Furthermore, in order to solve the problem of low permeability of oil shale in the undisturbed area of ​​coal seam mining by pre-fracturing, so as to more effectively increase the surface area and high-temperature gas conductivity of subsequent pyrolysis reaction and ensure more sufficient subsequent pyrolysis reaction, in step one, the number of boreholes is at least three, wherein at least one borehole is located between the injection well and the production well, and serves as an injection-production intermediate borehole, so that the outlet end of the injection-production intermediate borehole extends into the overlying oil shale, and is used as a fracturing well after casing is inserted; in step two, a supercritical carbon dioxide supply source is connected to the inlet end of the fracturing well, and high-pressure supercritical carbon dioxide is injected into the fracturing well by the supercritical carbon dioxide supply source, and the overlying oil shale layer is fractured by the high-pressure carbon dioxide, and the fracturing well is closed after the fracturing operation is completed; in step three, the carbon dioxide in the overlying oil shale layer after fracturing penetrates into the coal seam goaf, and reacts with carbon under the influence of the high temperature conditions of the residual coal gasification process to generate usable coal gas resources.

[0015] Furthermore, in order to quickly and accurately determine the location of the coal seam goaf and the three-zone effect fractures of coal seam mining, in step 1, the method for determining the location of the target mining area is as follows: The three-dimensional geological monitor is arranged on the surface and connected to the numerical calculation platform; the seismic wave is generated by artificial seismic source, and the seismic wave in the target mining area is collected synchronously by the three-dimensional geological monitor, and then transmitted to the numerical calculation platform; the seismic wave is analyzed and processed by the numerical calculation platform, and the fracture conductive geological structure information in the target mining area is determined by numerical simulation, and then the coal seam goaf is selected as the target mining area based on the geological structure information, and at the same time, it is ensured that there are coal gangue and residual coal in the coal seam goaf. Due to the different positions of the fractures in the collapse zone, fracture zone and curved subsidence zone of the overlying oil shale, its permeability changes will also be different. The permeability change of the overlying oil shale is the largest under the influence of the fractures in the collapse zone, the second largest under the influence of the fracture zone, and the smallest under the influence of the curved subsidence zone. By using this method to determine the target mining area, the "three-zone" effect of coal seam mining can be effectively utilized to influence the permeability of oil shale, and the evolution of fractures can be detected conveniently, thereby facilitating more efficient extraction of pyrolysis oil and gas resources and improving subsequent mining efficiency.

[0016] Furthermore, in order to monitor the entire mining process, and at the same time, to realize convenient and accurate regulation of the gasification agent flow rate through closed-loop regulation to significantly improve the yield of oil and gas products, in step three, a flow meter is used to collect the injection flow signal through the flow control valve in real time, and transmit it to the numerical calculation platform; a temperature probe is used to collect the temperature signal at the inlet end of the production well in real time, and transmit it to the numerical calculation platform; a pressure probe is used to collect the pressure signal at the outlet end of the injection well in real time, and transmit it to the numerical calculation platform; the numerical calculation platform is used to obtain injection flow data, temperature data and pressure data based on the injection flow signal, temperature signal and pressure signal, and the extraction parameters are obtained by calculation and analysis based on the injection flow data, temperature data and pressure data, and then the extraction parameters are uploaded to the terminal control device; At the same time, the product meter is used to collect the oil product flow signal and the gas product flow signal after separation by the separation device in real time, and upload them to the numerical calculation platform for feedback. The numerical calculation platform obtains the oil product flow data and the gas product flow data according to the oil product flow signal and the gas product flow signal, and then calculates, predicts and analyzes the oil and gas resource content based on the oil product flow data and the gas product flow data, and optimizes the extraction parameters according to the predicted results of the oil and gas resource content and the injection flow data of the gasifier, and then uploads the extraction parameters to the terminal control device; the terminal control device controls the valve opening of the flow regulating valve and the power of the separation device according to the extraction parameters, so as to realize the precise control of the gasifier injection flow and the separation efficiency of the oil and gas mixture, thereby effectively improving the yield of the oil product and the gas product.

[0017] Furthermore, in order to understand the changes in the cracks in the mining area in real time and to better optimize the collection process, a three-dimensional geological monitor is used to collect seismic wave signals from underground in real time and transmit them to the numerical calculation platform. The numerical calculation platform analyzes and processes the seismic waves, and perceives the changes in the cracks of the overlying oil shale or coal seam in real time based on the analysis and processing results. Then, the valve opening of the flow control valve is further fed back according to the changes in the cracks of the overlying oil shale or coal seam to further optimize the collection process of the oil and gas mixture. Since the underground mining process will cause fracture zones in the formation, these fractures help the flow of gas and gasifying agents in coal seams and oil shale. Therefore, accurate and timely monitoring of the distribution evolution of the formation rock fractures will help optimize the gas injection process and help avoid catastrophic events during the mining process.

[0018] In the present invention, high-temperature water vapor and pure oxygen are injected into the coal seam goaf area at a set flow rate ratio by using an injection well, and the two are fully mixed to form a gasifying agent. The gasifying agent can be used to fully gasify the residual coal body in the coal seam goaf area, thereby generating high-temperature coal gas with a higher temperature, thereby converting the residual coal into a gaseous product that can be extracted, thereby improving the resource recovery rate. In the gasification process, the gangue in the coal seam goaf area is used to maintain the stability of the goaf area and the overburden structure, thereby enabling the residual coal body in the gasification process to be gasified more fully. The high-temperature coal gas generated by the continuously injected gasifying agent is driven into the overlying oil shale layer, which can promote the pyrolysis reaction of the oil shale under the influence of the high-temperature coal gas to generate an oil-gas mixture. In this process, the influence of the three-zone effect fractures of coal seam mining on the overlying oil shale can be used to more effectively increase the permeability of the overlying oil shale. At the same time, the use of oil shale pyrolysis reaction can also increase the permeability of the overlying oil shale. The increased permeability can significantly increase the surface area of ​​the subsequent pyrolysis reaction, which can in turn promote the pyrolysis process to be more complete. Under the interaction of multiple factors, the pyrolysis process can be ensured to be fully carried out. This method allows the oil and gas resources in the oil shale to be fully exploited, fundamentally solving the problem of difficulty in oil shale mining and low utilization rate. At the same time, the residual coal underground is reused and a large amount of ground resources is saved. While reducing resource waste, it effectively protects the environment. Using the effect of negative pressure to allow the oil and gas mixture to enter the separation device through the cracks in the overlying oil shale and the production well, the separation of oil and gas products can be achieved conveniently and efficiently, and the target product can be directly obtained, reducing the intermediate transportation and delivery links.

[0019] In summary, compared with the prior art, the present invention has the following beneficial effects: 1. Solved the problem of waste of coal resources left in the goaf of coal seams: In the traditional coal seam mining process, the residual coal blocks in the goaf are usually difficult to effectively utilize, resulting in waste of resources. This method injects gasifiers into the goaf of coal seams, and uses the residual coal in the coal seams to gasify and produce high-temperature coal gas, effectively improving the utilization rate of residual resources in the goaf.

[0020] 2. Solved the technical problem of high difficulty in oil shale development: The development of oil shale resources requires high energy input, and the traditional mining and pyrolysis technology is inefficient, resulting in a large amount of additional resource waste. This method uses high-temperature coal gas from coal gasification to enter the overlying oil shale layer through cracks, driving the pyrolysis of oil shale into an oil and gas mixture, effectively reducing the energy consumption required for pyrolysis and realizing the efficient exploitation of oil shale oil and gas resources.

[0021] 3. The technical problem of the difficulty in exploiting tight oil shale oil and gas resources has been solved: coal seam mining leads to the formation of a complex "three-zone" fracture network in the overlying oil shale layer. Traditional mining methods find it difficult to fully utilize these fractures. This method significantly improves the permeability of oil shale by utilizing the "three-zone" fractures of coal seam mining, enhances the fluidity of fracture gas and the pyrolysis efficiency of oil shale, and optimizes and improves resource recovery efficiency.

[0022] 4. Solved the problem of surface environmental pollution: Traditional coal mining and oil shale development will cause serious surface environmental pollution problems. This method adopts underground gasification and pyrolysis technology. The entire mining process is carried out underground, reducing pollution to the surface environment. By optimizing the injection of gasifiers, it realizes the precise mining of oil and gas resources, reduces the risk of environmental pollution, and realizes green co-mining.

[0023] 5. Reduced surface subsidence in the area of ​​co-mining coal seams and oil shale: The collapse of the overlying rock strata in the goaf area of ​​traditional oil shale mining may lead to underground safety hazards and surface subsidence. By in-situ pyrolysis of oil shale, in-situ mining of oil shale oil and gas resources can be achieved, avoiding the generation of a large number of goaf areas by traditional mining methods, preventing the secondary large-scale migration of oil shale layers, and reducing the subsidence of the surface above the goaf. The implementation process of this method is simple and the implementation cost is low. It can further mine and recycle the residual coal left over from coal seam mining, and significantly improve the mining efficiency of oil and gas resources in the overlying oil shale layer. The entire mining process is carried out underground, with minimal environmental pollution, providing a low-carbon, green, efficient and convenient new way for the co-mining of coal and oil shale oil and gas resources in my country. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the common mining system in the present invention; Figure 2 It is a cross-sectional schematic diagram of the common sampling method in the present invention; Figure 3 It is a well pattern distribution diagram of the production well group in the present invention; Figure 4 is a schematic diagram of the structure of the gasification component in the present invention; Figure 5 It is a plan view of the common sampling method in the present invention; In the figure: 1, production well group, 11, injection well, 12, production well, 13, fracturing well, 14, casing; 2. Gasification assembly, 21. Gasifying agent, 211. High-temperature steam, 212. Pure oxygen, 22. Residual coal, 23. High-temperature coal gas, 24. Injection device, 241. Pressurized direct current pipe, 242. Feeding pipe, 243. Mixer; 3. low pressure area, 31. oil and gas mixture, 32. coal gangue, 33. coal pillar; 4. Extraction assembly, 41. Separation device; 5. Three-zone effect fractures in coal seam mining, 51. Coal seam goaf, 52. Overlying oil shale; 6. Terminal control equipment; 7. gasifying agent regulating device, 71. flow regulating valve, 72. flow meter; 8. Geological monitoring components, 81. Three-dimensional geological monitoring instrument, 82. Temperature probe, 83. Pressure probe, 84. Numerical calculation platform; 9. Collection component, 91. Product meter; 10. High-pressure supercritical carbon dioxide. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the present invention provides a system and method for the co-production of coal and oil shale oil and gas resources, including a production well group 1, a gasification component 2, a pumping component 4, a geological monitoring component 8, a collection component 9 and a terminal control device 6; The production well group 1 includes an injection well 11 and a production well 12. The injection well 11 is vertically arranged in the target production area, a sleeve 14 is installed inside the injection well 11, the outlet end of the injection well 11 extends to the coal seam goaf 51, and the inlet end of the production well 12 is located on the surface. The production well 12 is vertically arranged in the target production area at a set distance from the injection well 11, a sleeve 14 is installed inside the injection well 11, the inlet end of the production well 12 extends to the top of the fracture zone in the overlying oil shale 52, and the outlet end of the production well 12 is located on the surface. The gasification assembly 2 includes an injection device 24 and a gasification agent regulating device 7; the injection device 24 includes a booster direct current pipe 241, a feeding pipe 242 and a mixer 243; the outlet end of the booster direct current pipe 241 is inserted into the sleeve 14 at the inlet end of the injection well 11; the outlet end of the feeding pipe 242 is fixedly connected to one side of the upper section of the booster direct current pipe 241 and is communicated with the inner cavity of the booster direct current pipe 241; the rotating unit of the mixer 243 is rotatably arranged in the inner cavity of the middle section of the booster direct current pipe 241 In the embodiment, the driving part of the mixer 243 is installed on the outer side wall of the boosting direct current pipe 241, and is used to drive the rotating unit to rotate; the gasifying agent regulating device 7 includes a flow regulating valve 71 and a flow meter 72; the flow regulating valve 71 is connected in series to the boosting direct current pipe 241, and is located between the outlet end of the feeding pipe 242 and the rotating unit of the mixer 243; the flow meter 72 is installed on the valve body of the flow regulating valve 71, and is connected to the valve cavity of the flow regulating valve 71, and is used to collect the injection flow signal in real time; The extraction assembly 4 includes a separation device 41, the inlet end of the separation device 41 is connected to the sleeve 14 at the outlet end of the production well 12, and is used to separate the oil and gas mixture 31 discharged from the production well 12; The geological monitoring assembly 8 includes a three-dimensional geological monitoring instrument 81, a temperature probe 82, a pressure probe 83 and a numerical calculation platform 84; the three-dimensional geological monitoring instrument 81 is arranged on the surface of the target mining area; the temperature probe 82 is installed on the side wall of the inlet end of the production well 12, and is used to collect temperature signals; the pressure probe 83 is installed on the side wall of the outlet end of the injection well 11, and is used to collect pressure signals; the numerical calculation platform 84 is set on the surface, and is connected to the flow meter 72, the three-dimensional geological monitoring instrument 81, the temperature probe 82 and the pressure probe 83 respectively; The collection component 9 includes a product meter 91, which is connected to the separation device 41 and the numerical calculation platform 84 respectively, and is used to collect the flow signal of the target product in real time; The terminal control device 6 is respectively connected to the driving part of the mixer 243, the separation device 41, the flow regulating valve 71 and the numerical calculation platform 84. The terminal control device 6 has the ability to automatically control the operation of the extraction equipment.

[0027] Furthermore, the terminal control device 6 and the numerical calculation platform 84 are both industrial computers. Using industrial computers for data processing and numerical calculation analysis can make the transmission process of data acquisition instructions more convenient and efficient, which is conducive to improving the reliability of the system.

[0028] In order to fully increase the permeability of the oil shale layer in the area not disturbed by coal seam mining by pre-fracturing, so as to realize the full and efficient exploitation of oil shale oil and gas resources, the exploitation well group 1 can also include a fracturing well 13, which is vertically arranged in the target exploitation area, and has a sleeve 14 installed inside, with its outlet end extending to the area in the overlying oil shale 52 not disturbed by coal seam mining, and its inlet end is located on the surface.

[0029] In order to more effectively ensure the high efficiency of the re-mining and utilization of the residual coal body and prevent the shortage of residual coal gasification resources, the target mining area has coal pillars 33 on both sides of the coal seam goaf 51. In this way, the coal gasification process can recover a large amount of residual coal pillars, and then a large amount of difficult-to-mine residual coal pillar coal resources can be mined.

[0030] In order to form a gasifying agent that is beneficial to the gasification of residual coal by supplying high-temperature water vapor and pure oxygen, the inlet end of the booster direct current pipe 241 is connected to a high-temperature water vapor supply source, and the inlet end of the feeding pipe 242 is connected to a pure oxygen supply source.

[0031] In the present invention, the lower end of the injection well is extended to the coal seam goaf, and a sleeve is inserted therein, so that the injection well can be used to inject a gasifier into the coal seam goaf, and the gasifier can be used to cause the residual coal in the coal seam goaf to undergo a combustion reaction and gasify into high-temperature coal gas. Furthermore, the high-temperature coal gas and the gasifier will flow through the fissures to the position of the overlying oil shale under the influence of the three-zone effect fissures of coal seam mining, and will undergo a pyrolysis reaction with the overlying oil shale to generate an oil-gas mixture. The lower end of the production well is extended to the top of the overlying oil shale fracture zone, and a sleeve is inserted therein, so that the oil-gas mixture can be conveniently used to flow to the low-pressure zone, and the oil-gas mixture can be diverted to the surface through the production well to realize the production of the oil-gas mixture. This arrangement of the production well group can directly and efficiently connect the coal seam goaf, the overlying oil shale, and the gasification assembly and separation device located on the surface, which can effectively save engineering costs and is conducive to improving the inflow efficiency and production efficiency. Connecting a gasification component at the inlet end of the injection well, and making the injection device in the gasification component have a booster direct current pipe and a feeding pipe that are interconnected, can facilitate the use of the booster direct current pipe and the feeding pipe to respectively carry out the filling operation of high-pressure water vapor and pure oxygen. The injection device is provided with a mixer, which can facilitate the use of the mixer to efficiently mix the injected high-pressure water vapor and pure oxygen, thereby forming a gasifier with a better effect, which is conducive to accelerating the reaction process of the gasifier and the residual coal. Connecting a gasifier regulating device in the injection device can facilitate the adjustment of the injection flow of the gasifier. By setting a flowmeter on the flow regulating valve, it is convenient to collect the flow signal of the injected gasifier in real time, and then the flow data of the injected gasifier can be obtained. Therefore, it is convenient for the numerical calculation platform and the terminal control device to feedback control the flow regulating valve according to the flow data of the injected gasifier, so that the injection process of the gasifier can be more accurately controlled and high-speed. Connecting a separation device at the outlet of the production well can facilitate the separation and processing of oil and gas products directly at the wellhead of the production well, which is conducive to reducing the intermediate transportation links and improving the operation efficiency. Through the setting of the three-dimensional geological monitoring instrument, it is convenient to collect seismic signals on the surface, which is conducive to the subsequent numerical calculation platform to accurately analyze the geological structure below the target mining area according to the seismic signals, so as to efficiently and accurately determine the coal seam goaf area and the area where the three-zone effect fractures of coal seam mining are located, so that the drilling position of the production well group can be quickly and accurately determined. By burying a temperature sensor on the side wall of the inlet end of the production well, it is convenient to collect the temperature signal near the inlet end of the production well in real time, and then it is convenient to obtain the temperature data of the oil and gas mixture according to the temperature signal. According to the temperature data, it is helpful to accurately judge whether the pyrolysis reaction is sufficient. At the same time, the temperature data can be used as feedback data, which is convenient for the terminal control device to better adjust the valve opening of the flow control valve.By embedding a pressure sensor on the side wall of the outlet end of the injection well, it is convenient to collect the pressure signal near the outlet end of the injection well in real time, and then it is convenient to obtain the pressure data of the coal seam goaf area according to the pressure signal. According to the pressure data, it is helpful to accurately judge the combustion reaction in the coal seam goaf area. At the same time, the pressure data can be used as feedback data to facilitate the terminal control device to better adjust the valve opening of the flow control valve. Connecting the product meter with the separation device can facilitate the real-time collection of the flow signal of the target product, and then it is convenient for the numerical calculation platform to obtain the flow data of the product according to the flow signal of the product, and the input parameters can be predicted with the flow data as feedback data, and finally the terminal control device can accurately adjust the flow control valve to fully improve the yield of oil products and gas products. The terminal control device is connected to the mixer, separation device, flow control valve and numerical calculation platform respectively, and the terminal control device can be used as the central control unit of the entire system, and is responsible for the operation and control of each part. Through intelligent regulation, efficient management of the oil and gas resource development process can be achieved, and production efficiency can be significantly improved.

[0032] The system can make secondary use of the remaining coal seam resources underground, and the entire mining process is basically carried out underground, avoiding environmental pollution. At the same time, the system can form overlying rock fracture zones by utilizing coal seam mining, increase the fracture conductivity and pyrolysis reaction area of ​​the overlying oil shale layer, and the pyrolysis reaction increases the permeability of the oil shale, realizing a more comprehensive mining process for oil and gas resources. While saving resources, it also significantly improves the mining efficiency of oil and gas resources in the oil shale layer, achieving the goal of efficient and green co-mining of coal and oil shale.

[0033] The present invention also provides a method for co-mining coal and oil shale oil and gas resources, using a system for co-mining coal and oil shale oil and gas resources, comprising the following steps: Step 1: first determine the target mining area, then start drilling vertically from the upper surface corresponding to the target mining area toward the coal seam goaf 51, the number of drill holes is at least two, wherein at least one drill hole extends into the coal seam goaf 51, and after inserting a suitable casing 14, it serves as an injection well 11, and at least one drill hole extends into the overlying oil shale 52 under the influence of the three-zone effect fracture 5 of coal seam mining, and after inserting a suitable casing 14, it serves as a production well 12; Among them, the three-zone effect fractures 5 of coal seam mining include fractures in the collapse zone, fractures in the fracture zone, and fractures in the curved sinking zone; When multiple injection wells 11 and production wells 12 are set up simultaneously in the target production area, the injection wells 11 and the production wells 12 can adopt a "five-point" well pattern distribution method.

[0034] Step 2: embed a pressure probe 83 on the side wall of the injection well 11 outlet, and embed a temperature probe 82 on the side wall of the production well 12 inlet; insert the outlet end of the booster direct current pipe 241 in the gasification component 2 into the sleeve 14 at the inlet end of the injection well 11; connect the inlet end of the separation device 41 in the extraction component 4 to the outlet end of the production well 12; Establish a connection between the product meter 91 and the separation device 41; respectively establish connections between the numerical calculation platform 84 and the flow meter 72, the product meter 91, the temperature probe 82 and the pressure probe 83; respectively establish connections between the terminal control device 6 and the drive part of the mixer 243, the separation device 41, the flow control valve 71 and the numerical calculation platform 84; Step 3: Connect the high-temperature steam supply source to the inlet end of the booster direct current pipe 241, connect the pure oxygen supply source to the inlet end of the feeding pipe 242, and simultaneously supply the high-temperature steam 211 and pure oxygen 212 to the gasification component 2, and control the supply flow of the high-temperature steam 211 supply source and the pure oxygen 212 supply source according to the set flow ratio; At the same time, the terminal control device 6 controls the drive part of the mixer 243 to start working, and the mixer 243 is used to fully mix the high-temperature water vapor 211 and the pure oxygen 212 to form the gasification agent 21. At the same time, the gasification agent 21 is injected into the injection well 11 at a high speed by the pressurization effect of the mixer 243, and is transported to the coal seam goaf 51 through the injection well 11; the gasification agent 21 is used to react with the residual coal 22 in the coal seam goaf 51 to gasify the residual coal 22 into high-temperature coal gas 23. In this process, the coal gangue 32 in the coal seam goaf 51 is used to maintain the stability and conductivity of the pore fracture structure of the coal seam goaf 51, and promote a more complete combustion process; Step 4: Continue to inject the gasifying agent 21 to continue the gasification process of the residual coal 22 to the high-temperature coal gas 23. At the same time, the high-temperature coal gas 23 is driven toward the overlying oil shale 52 along the fissures in the coal seam goaf 51 by the increasing gasifying agent 21, and pyrolysis occurs after contacting the overlying oil shale 52 to generate an oil-gas mixture 31. In this process, the influence of the three-zone effect fissures 5 of coal seam mining on the overlying oil shale 52 is utilized to increase the permeability of the overlying oil shale 52. At the same time, the pyrolysis process is utilized to increase the permeability of the overlying oil shale 52, and the increased permeability is simultaneously utilized to reversely promote a more complete pyrolysis process. At the same time, the increasing high-temperature coal gas 23 is used to cause the generated oil-gas mixture 31 to flow from the cracks of the overlying oil shale 52 to the low-pressure area 3; Step 5: Using negative pressure, the oil-gas mixture 31 flows out through the cracks in the overlying oil shale 52 and enters the outlet of the production well 12, and then is produced from underground through the production well 12 and injected into the separation device 41; the oil-gas mixture 31 is subjected to oil-gas separation treatment using the separation device 41 to obtain the target product.

[0035] In order to significantly improve the permeability of the overlying oil shale by means of early fracturing, so as to more effectively increase the surface area of ​​the subsequent pyrolysis reaction and ensure that the subsequent pyrolysis reaction proceeds more fully, in step 1, the number of boreholes is at least three, and more may be added, wherein at least one borehole is located between the injection well 11 and the production well 12, and serves as an injection-production intermediate borehole, so that the outlet end of the injection-production intermediate borehole extends to the area of ​​the overlying oil shale 52 that is not affected by the coal seam mining cracks, and is inserted into the casing 14 to serve as the fracturing well 13; In step 2, a supercritical carbon dioxide supply source is connected to the inlet end of the fracturing well 13, and high-pressure supercritical carbon dioxide 10 is injected into the fracturing well 13 using the supercritical carbon dioxide supply source. The overlying oil shale layer 52 is fractured by the high-pressure carbon dioxide, and the fracturing well 13 is closed after the fracturing operation is completed; in step 3, the carbon dioxide in the overlying oil shale layer 52 after fracturing penetrates into the coal seam goaf 51, and reacts with carbon under the influence of the high temperature conditions of the gasification process of the residual coal 22 to generate usable coal gas resources.

[0036] In step 1, in order to quickly and accurately determine the location of the coal seam goaf and the three-zone effect fractures of coal seam mining, the method for determining the location of the target mining area is as follows: The three-dimensional geological monitor 81 is arranged on the surface, and the three-dimensional geological monitor 81 is connected to the numerical calculation platform 84; the seismic wave is generated by an artificial source, and the seismic wave in the target mining area is collected synchronously by the three-dimensional geological monitor 81, and then transmitted to the numerical calculation platform 84; the seismic wave is analyzed and processed by the numerical calculation platform 84, and the fracture conductive geological structure information in the target mining area is determined by numerical simulation, and then the coal seam goaf 51 is selected as the target mining area according to the geological structure information, and at the same time, it is ensured that the coal seam goaf 51 retains coal gangue 32 and residual coal 22. Due to the different positions of the fractures in the collapse zone, the fracture zone and the fractures in the curved sinking zone of the overlying oil shale, the permeability change will also be different. The permeability change of the overlying oil shale is the largest under the influence of the fractures in the collapse zone, the second largest under the influence of the fracture zone, and the smallest under the influence of the curved sinking zone. By using this method to determine the target mining area, the "three-zone" effect of coal seam mining can be effectively utilized to influence the permeability of oil shale, and the evolution of fractures can be detected conveniently, thereby facilitating more efficient extraction of pyrolysis oil and gas resources and improving subsequent mining efficiency.

[0037] In order to monitor the entire mining process, and to achieve convenient and accurate regulation of the gasification agent flow rate through closed-loop regulation to significantly increase the yield of oil and gas products, In step three, the flow meter 72 is used to collect the injection flow signal through the flow regulating valve 71 in real time, and transmit it to the numerical calculation platform 84; the temperature probe 82 is used to collect the temperature signal at the inlet end of the production well 12 in real time, and transmit it to the numerical calculation platform 84; the pressure probe 83 is used to collect the pressure signal at the outlet end of the injection well 11 in real time, and transmit it to the numerical calculation platform 84; the numerical calculation platform 84 obtains the injection flow data, temperature data and pressure data based on the injection flow signal, temperature signal and pressure signal, and calculates and analyzes the injection flow data, temperature data and pressure data to obtain the extraction parameters, and then uploads the extraction parameters to the terminal control device 6.

[0038] At the same time, the product meter 91 is used to collect the oil product flow signal and the gas product flow signal after separation by the separation device 41 in real time, and upload them to the numerical calculation platform 84 for feedback. The numerical calculation platform 84 obtains the oil product flow data and the gas product flow data according to the oil product flow signal and the gas product flow signal, and then calculates, predicts and analyzes the oil and gas resource content according to the oil product flow data and the gas product flow data, and optimizes the extraction parameters according to the predicted results of the oil and gas resource content and the injection flow data of the gasifier, and then uploads the extraction parameters to the terminal control device 6. The terminal control device 6 controls the valve opening of the flow regulating valve 71 and the power of the separation device 41 according to the extraction parameters, so as to realize the precise control of the injection flow of the gasifier 21 and the separation efficiency of the oil-gas mixture 31, thereby effectively improving the yield of the oil product and the gas product.

[0039] Furthermore, in order to understand the changes in the cracks in the mining area in real time so as to better optimize the collection process, in step 3, the three-dimensional geological monitor 81 is used to collect the seismic wave signals from the underground in real time and transmit them to the numerical calculation platform 84. The numerical calculation platform 84 analyzes and processes the seismic waves, and perceives the changes in the cracks of the overlying oil shale 52 or coal seam in real time based on the analysis and processing results, and then further feedback controls the valve opening of the flow control valve 71 based on the changes in the cracks of the overlying oil shale 52 or coal seam, so as to further optimize the collection process of the oil and gas mixture 31. Since the underground mining process will cause fracture zones in the formation, these fractures help the flow of gas and gasifying agents in the coal seam and oil shale. Therefore, by accurately and timely monitoring the distribution evolution of the formation rock fractures, it is helpful to optimize the gas injection process and help avoid catastrophic events during the mining process.

[0040] In the present invention, high-temperature water vapor and pure oxygen are injected into the coal seam goaf area at a set flow rate ratio by using an injection well, and the two are fully mixed to form a gasifying agent. The gasifying agent can be used to fully gasify the residual coal body in the coal seam goaf area, thereby generating high-temperature coal gas with a higher temperature, thereby converting the residual coal into a gaseous product that can be extracted, thereby improving the resource recovery rate. In the gasification process, the gangue in the coal seam goaf area is used to maintain the stability of the goaf area and the overburden structure, thereby enabling the residual coal body in the gasification process to be gasified more fully. The high-temperature coal gas generated by the continuously injected gasifying agent is driven into the overlying oil shale layer, which can promote the pyrolysis reaction of the oil shale under the influence of the high-temperature coal gas to generate an oil-gas mixture. In this process, the influence of the three-zone effect fractures of coal seam mining on the overlying oil shale can be used to more effectively increase the permeability of the overlying oil shale. At the same time, the use of oil shale pyrolysis reaction can also increase the permeability of the overlying oil shale. The increased permeability can significantly increase the surface area of ​​the subsequent pyrolysis reaction, which can in turn promote the pyrolysis process to be more complete. Under the interaction of multiple factors, the pyrolysis process can be ensured to be fully carried out. This method allows the oil and gas resources in the oil shale to be fully exploited, fundamentally solving the problem of difficulty in oil shale mining and low utilization rate. At the same time, the residual coal underground is reused and a large amount of ground resources is saved. While reducing resource waste, it effectively protects the environment. Using the effect of negative pressure to allow the oil and gas mixture to enter the separation device through the cracks in the overlying oil shale and the production well, the separation of oil and gas products can be achieved conveniently and efficiently, and the target product can be directly obtained, reducing the intermediate transportation and delivery links.

[0041] In summary, compared with the prior art, the present invention has the following beneficial effects: 1. Solved the problem of waste of coal resources left in the goaf of coal seams: In the traditional coal seam mining process, the residual coal blocks in the goaf are usually difficult to effectively utilize, resulting in waste of resources. This method injects gasifiers into the goaf of coal seams, and uses the residual coal in the coal seams to gasify and produce high-temperature coal gas, effectively improving the utilization rate of residual resources in the goaf.

[0042] 2. Solved the technical problem of high difficulty in oil shale development: The development of oil shale resources requires high energy input, and the traditional mining and pyrolysis technology is inefficient, resulting in a large amount of additional resource waste. This method uses high-temperature coal gas from coal gasification to enter the overlying oil shale layer through cracks, driving the pyrolysis of oil shale into an oil and gas mixture, effectively reducing the energy consumption required for pyrolysis and realizing the efficient exploitation of oil shale oil and gas resources.

[0043] 3. The technical problem of the difficulty in exploiting tight oil shale oil and gas resources has been solved: coal seam mining leads to the formation of a complex "three-zone" fracture network in the overlying oil shale layer. Traditional mining methods find it difficult to fully utilize these fractures. This method significantly improves the permeability of oil shale by utilizing the "three-zone" fractures of coal seam mining, enhances the fluidity of fracture gas and the pyrolysis efficiency of oil shale, and optimizes and improves resource recovery efficiency.

[0044] 4. Solved the problem of surface environmental pollution: Traditional coal mining and oil shale development will cause serious surface environmental pollution problems. This method adopts underground gasification and pyrolysis technology. The entire mining process is carried out underground, reducing pollution to the surface environment. By optimizing the injection of gasifiers, it realizes the precise mining of oil and gas resources, reduces the risk of environmental pollution, and realizes green co-mining.

[0045] 5. Reduced surface subsidence in the area of ​​co-mining coal seams and oil shale: The collapse of the overlying rock strata in the goaf area of ​​traditional oil shale mining may lead to underground safety hazards and surface subsidence. By in-situ pyrolysis of oil shale, in-situ mining of oil shale oil and gas resources can be achieved, avoiding the generation of a large number of goaf areas by traditional mining methods, preventing the secondary large-scale migration of oil shale layers, and reducing the subsidence of the surface above the goaf. The implementation process of this method is simple and the implementation cost is low. It can further mine and recycle the residual coal left over from coal seam mining, and significantly improve the mining efficiency of oil and gas resources in the overlying oil shale layer. The entire mining process is carried out underground, with minimal environmental pollution, providing a low-carbon, green, efficient and convenient new way for the co-mining of coal and oil shale oil and gas resources in my country.

Claims

1. A system for co-production of coal and oil shale oil and gas resources, comprising a production well group (1), wherein the production well group (1) comprises an injection well (11) and a production well (12), wherein the injection well (11) is vertically arranged in a target production area, a sleeve (14) is installed inside the injection well, an outlet end of the injection well (11) extends into a coal seam goaf (51), and an inlet end of the production well (12) is located on the ground surface; the production well (12) is vertically arranged in the target production area at a set distance from the injection well (11), a sleeve (14) is installed inside the injection well, an inlet end of the injection well (12) extends to the top of a fracture zone in an overlying oil shale (52), and an outlet end of the production well (12) is located on the ground surface; It is characterized in that It also includes a gasification component (2), a drainage component (4), a geological monitoring component (8), a collection component (9) and a terminal control device (6); The gasification assembly (2) comprises an injection device (24) and a gasifying agent regulating device (7); the injection device (24) comprises a pressurized direct current pipe (241), a feeding pipe (242) and a mixer (243); the outlet end of the pressurized direct current pipe (241) is inserted into a sleeve (14) at the inlet end of the injection well (11); the outlet end of the feeding pipe (242) is fixedly connected to one side of the upper section of the pressurized direct current pipe (241) and communicated with the inner cavity of the pressurized direct current pipe (241); the rotating unit of the mixer (243) is rotatably arranged in the middle section of the pressurized direct current pipe (241); The driving part of the mixer (243) is installed on the outer wall of the boosting direct current pipe (241) and is used to drive the rotating unit to rotate; the gasifying agent regulating device (7) comprises a flow regulating valve (71) and a flow meter (72); the flow regulating valve (71) is connected in series to the boosting direct current pipe (241) and is located between the outlet end of the feeding pipe (242) and the rotating unit of the mixer (243); the flow meter (72) is installed on the valve body of the flow regulating valve (71) and is connected to the valve cavity of the flow regulating valve (71) and is used to collect the injection flow signal in real time; The extraction assembly (4) comprises a separation device (41), the inlet end of the separation device (41) being connected to the sleeve (14) at the outlet end of the production well (12), and being used for separating oil and gas from the oil and gas mixture (31) discharged from the production well (12); The geological monitoring component (8) comprises a three-dimensional geological monitoring instrument (81), a temperature probe (82), a pressure probe (83) and a numerical calculation platform (84); the three-dimensional geological monitoring instrument (81) is arranged on the surface of the target mining area; the temperature probe (82) is installed on the side wall of the inlet end of the production well (12) for collecting temperature signals; the pressure probe (83) is installed on the side wall of the outlet end of the injection well (11) for collecting pressure signals; the numerical calculation platform (84) is arranged on the surface and is respectively connected to the flow meter (72), the three-dimensional geological monitoring instrument (81), the temperature probe (82) and the pressure probe (83); The collection component (9) comprises a product meter (91), wherein the product meter (91) is connected to the separation device (41) and the numerical calculation platform (84) respectively, and is used to collect the flow signal of the target product in real time; The terminal control device (6) is respectively connected to the driving part of the mixer (243), the separation device (41), the flow regulating valve (71) and the numerical calculation platform (84).

2. A system for co-production of coal and oil shale oil and gas resources according to claim 1, characterized in that: The terminal control device (6) and the numerical calculation platform (84) are both industrial computers.

3. A system for co-production of coal and oil shale oil and gas resources according to claim 1 or 2, characterized in that: The production well group (1) also includes a fracturing well (13), which is vertically arranged in the target production area, with a sleeve (14) installed on the upper part, the outlet end of which extends into the overlying oil shale (52), and the inlet end of which is located on the surface.

4. A system for co-production of coal and oil shale oil and gas resources according to claim 3, characterized in that: The target mining area has coal pillars (33) on both sides of the coal seam goaf (51).

5. A system for co-production of coal and oil shale oil and gas resources according to claim 1, characterized in that: The inlet end of the booster direct current pipe (241) is connected to a high-temperature water vapor supply source, and the inlet end of the feed pipe (242) is connected to a pure oxygen supply source.

6. A method for co-production of coal and oil shale oil and gas resources, using a system for co-production of coal and oil shale oil and gas resources as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: first determine the target mining area, then vertically drill holes from the upper surface corresponding to the target mining area in the direction of the coal seam goaf (51), the number of holes drilled is at least two, wherein at least one drill hole extends into the coal seam goaf (51), and after inserting a suitable casing (14), it serves as an injection well (11), and at least one drill hole extends into the overlying oil shale (52) under the influence of the three-zone effect fracture (5) of coal seam mining, and after inserting a suitable casing (14), it serves as a production well (12); Step 2: embed a pressure probe (83) in the side wall of the outlet end of the injection well (11), and embed a temperature probe (82) in the side wall of the inlet end of the production well (12); insert the outlet end of the booster direct current pipe (241) in the gasification component (2) into the sleeve (14) at the inlet end of the injection well (11); connect the inlet end of the separation device (41) in the extraction component (4) to the outlet end of the production well (12); Establishing a connection between the product meter (91) and the separation device (41); establishing connections between the numerical calculation platform (84) and the flow meter (72), the product meter (91), the temperature probe (82) and the pressure probe (83); establishing connections between the terminal control device (6) and the drive part of the mixer (243), the separation device (41), the flow control valve (71) and the numerical calculation platform (84); Step 3: Connecting a high-temperature water vapor supply source to the inlet end of the booster direct current pipe (241), connecting a pure oxygen supply source to the inlet end of the feed pipe (242), and simultaneously supplying high-temperature water vapor (211) and pure oxygen (212) to the gasification component (2), and controlling the supply flow rates of the high-temperature water vapor (211) supply source and the pure oxygen (212) supply source respectively according to a set flow rate ratio; At the same time, the terminal control device (6) controls the drive part of the mixer (243) to start working, and the mixer (243) is used to fully mix the high-temperature water vapor (211) and the pure oxygen (212) to form a gasifying agent (21). At the same time, the gasifying agent (21) is injected into the injection well (11) at a high speed by using the pressurization effect of the mixer (243), and is transported to the coal seam goaf (51) through the injection well (11); the gasifying agent (21) is used to react with the residual coal (22) in the coal seam goaf (51) to cause the residual coal (22) to gasify into high-temperature coal gas (23). In this process, the coal gangue (32) and the coal pillars (33) on both sides of the coal seam goaf (51) are used to maintain the stability and conductivity of the pore structure of the coal seam goaf (51), and promote a more complete combustion process; Step 4: Continue to inject the gasifying agent (21) to continue the gasification process of the residual coal (22) to the high-temperature coal gas (23). At the same time, the continuously increasing gasifying agent (21) is used to drive the generated high-temperature coal gas (23) along the cracks in the coal seam goaf (51) to the overlying oil shale (52), and after contacting the overlying oil shale (52), a pyrolysis reaction occurs to generate an oil-gas mixture (31). In this process, the influence of the three-zone effect cracks (5) of coal seam mining on the overlying oil shale (52) is used to increase the permeability of the overlying oil shale (52). At the same time, the pyrolysis process is used to increase the permeability of the overlying oil shale (52), and the increased permeability is used to reversely promote a more complete pyrolysis process. At the same time, the increasing high-temperature coal gas (23) is used to cause the generated oil-gas mixture (31) to flow from the cracks in the overlying oil shale (52) to the low-pressure area (3); Step 5: using the negative pressure, the oil-gas mixture (31) flows out through the cracks in the overlying oil shale (52) and enters the outlet of the production well (12), and then is produced from underground through the production well (12) and injected into the separation device (41); The oil-gas mixture (31) is subjected to oil-gas separation processing by using a separation device (41) to obtain target oil-gas resource products.

7. A method for co-mining coal and oil shale oil and gas resources according to claim 6, characterized in that: In step 1, the number of boreholes is at least three, wherein at least one borehole is located between the injection well (11) and the production well (12) and serves as an injection-production intermediate borehole, the outlet end of the injection-production intermediate borehole extends into the overlying oil shale (52), and a casing (14) is inserted to serve as a fracturing well (13); In step 2, a supercritical carbon dioxide supply source is connected to the inlet of the fracturing well (13), and high-pressure supercritical carbon dioxide (10) is injected into the fracturing well (13) using the supercritical carbon dioxide supply source. The overlying oil shale layer (52) is fractured by the high-pressure carbon dioxide, and the fracturing well (13) is closed after the fracturing operation is completed. In step 3, the carbon dioxide in the overlying oil shale layer (52) after fracturing penetrates into the coal seam goaf (51), and reacts with carbon under the influence of the high temperature conditions of the residual coal (22) gasification process to generate usable coal gas resources.

8. A method for co-mining coal and oil shale oil and gas resources according to claim 7, characterized in that: In step 1, the method for determining the location of the target mining area is as follows: A three-dimensional geological monitoring instrument (81) is arranged on the surface, and the three-dimensional geological monitoring instrument (81) is connected to a numerical computing platform (84); an artificial seismic source is used to generate seismic waves, and the seismic waves in the target mining area are synchronously collected by the three-dimensional geological monitoring instrument (81), and then transmitted to the numerical computing platform (84); the seismic waves are analyzed and processed by the numerical computing platform (84), and the fracture conductive geological structure information in the target mining area is determined by numerical simulation, and then the coal seam goaf area (51) is selected as the target mining area based on the geological structure information, and at the same time, it is ensured that coal gangue (32) and residual coal (22) are retained in the coal seam goaf area (51).

9. A method for co-mining coal and oil shale oil and gas resources according to claim 8, characterized in that: In step three, the injection flow signal passing through the flow control valve (71) is collected in real time by using the flow meter (72) and transmitted to the numerical calculation platform (84); the temperature signal at the inlet end of the production well (12) is collected in real time by using the temperature probe (82) and transmitted to the numerical calculation platform (84); the pressure signal at the outlet end of the injection well (11) is collected in real time by using the pressure probe (83) and transmitted to the numerical calculation platform (84); the injection flow data, temperature data and pressure data are obtained by the numerical calculation platform (84) based on the injection flow signal, temperature signal and pressure signal, and the extraction parameters are obtained by calculation and analysis based on the injection flow data, temperature data and pressure data, and then the extraction parameters are uploaded to the terminal control device (6); At the same time, the product meter (91) is used to collect the oil product flow signal and the gas product flow signal after separation by the separation device (41) in real time, and upload them to the numerical calculation platform (84) for feedback. The numerical calculation platform (84) obtains oil product flow data and gas product flow data according to the oil product flow signal and the gas product flow signal, and then calculates, predicts and analyzes the oil and gas resource content according to the oil product flow data and the gas product flow data, and optimizes the extraction parameters according to the predicted results of the oil and gas resource content and the injection flow data of the gasifying agent, and then uploads the extraction parameters to the terminal control device (6); the terminal control device (6) controls the valve opening of the flow regulating valve (71) and the power of the separation device (41) according to the extraction parameters, so as to achieve accurate control of the injection flow of the gasifying agent (21) and the separation efficiency of the oil and gas mixture (31), thereby effectively improving the yield of the oil product and the gas product.

10. A method for co-mining coal and oil shale oil and gas resources according to claim 9, characterized in that: In step three, a three-dimensional geological monitoring instrument (81) is used to collect seismic wave signals from underground in real time and transmit them to a numerical computing platform (84). The numerical computing platform (84) analyzes and processes the seismic waves and senses the changes in the cracks of the overlying oil shale (52) or coal seam in real time based on the analysis and processing results. The valve opening of the flow control valve (71) is further feedback-controlled based on the changes in the cracks of the overlying oil shale (52) or coal seam, so as to further optimize the collection process of the oil and gas mixture (31).

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