Underground in-situ pyrolysis and multi-process simulation experiment system for oil-rich coal

Abstract

The invention discloses an oil-rich coal underground in-situ pyrolysis and multi-process simulation experiment system, and relates to the technical field of oil-rich coal in-situ mining. Comprising a high-temperature nitrogen filling system, a fluid configuration system, an in-situ formation temperature and pressure simulation system and a product collection system, wherein the high-temperature nitrogen filling system injects high-temperature nitrogen into the in-situ formation temperature and pressure simulation system, the fluid preparation system is used for preparing a required fluid solution and injecting the required fluid solution into the in-situ formation temperature and pressure simulation system, and the in-situ formation temperature and pressure simulation system is used for containing materials required by an experiment and simulating the temperature and pressure required by the experiment. The product collecting system is used for collecting and separating materials generated in the test; through modular combination of four core systems, namely a high-temperature nitrogen filling system, a fluid configuration system, an in-situ formation temperature and pressure simulation system and a product collection system, compatibility of in-situ pyrolysis, hydrocarbon generation simulation, water-rock reaction and element migration experiments of oil-rich coal is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of in-situ mining of rich oil coal, and particularly to an in-situ pyrolysis and multi-process simulation experimental system for rich oil coal underground. Background Art

[0002] Rich oil coal is an important energy resource, and its in-situ underground pyrolysis technology is one of the important ways to achieve clean and efficient utilization of coal. However, there are still many challenges in the current research on the in-situ underground pyrolysis process of rich oil coal. In addition, the traditional in-situ formation simulation devices have a single function, and different experimental devices are used separately for hydrocarbon generation simulation, water-rock simulation, and element migration simulation. The traditional single-function formation simulation devices have many disadvantages in terms of experimental efficiency, cost control, data integration, and simulation coupling process. These disadvantages not only increase the complexity and cost of the experiment, but also limit the in-depth study of the related processes of formation simulation. Summary of the Invention

[0003] The purpose of the present invention is to provide an in-situ pyrolysis and multi-process simulation experimental system for rich oil coal underground to solve at least some of the above problems.

[0004] To achieve the above purpose, the present invention provides the following technical solution: An in-situ pyrolysis and multi-process simulation experimental system for rich oil coal underground, comprising a high-temperature nitrogen injection system, a fluid configuration system, an in-situ formation temperature and pressure simulation system, and a product collection system;

[0005] Among them, the high-temperature nitrogen injection system injects high-temperature nitrogen into the in-situ formation temperature and pressure simulation system, the fluid configuration system is used to prepare the required fluid solution and inject it into the in-situ formation temperature and pressure simulation system, the in-situ formation temperature and pressure simulation system is used to hold the experimental materials and simulate the required temperature and pressure for the experiment, and the product collection system collects and separates the materials generated by the experiment.

[0006] Further, the fluid configuration system includes a reagent tank, a batching tank, a stirring component, a liquid suction component, a temperature control chamber, and a feeding component;

[0007] Multiple reagent tanks are respectively connected to the batching tank, the stirring component is arranged on the batching tank, both ends of the liquid suction component are respectively connected to the batching tank and the temperature control chamber, and the temperature control chamber is connected to the in-situ formation temperature and pressure simulation system through the feeding component;

[0008] Among them, the reagent tank is used to hold the required reagents, the liquid suction component is used to suck the fluid in the batching tank into the temperature control chamber, and the feeding component is used to send the fluid in the temperature control chamber into the in-situ formation temperature and pressure simulation system.

[0009] Further, the fluid configuration system further includes a medicine delivery component;

[0010] The medicine delivery component includes a medicine delivery pipe, a material control automatic valve, and a micro weight sensor. The delivery pipe is connected to the medicine tank through an automatic switch hole. The material control automatic valve is arranged inside the delivery pipe, and the micro weight sensor is arranged on the material control automatic valve.

[0011] Further, the stirring component includes a stirring motor, stirring fan blades, and stirring micro blades. The stirring motor drives the stirring fan blades and the stirring micro blades to rotate respectively. The stirring fan blades and the stirring micro blades are both arranged inside the batching tank.

[0012] Further, the liquid suction component includes a liquid suction pipe, a fluid flowmeter, a flow control automatic valve, a liquid suction pump, and a backflow prevention automatic valve. The fluid flowmeter, the flow control automatic valve, the liquid suction pump, and the backflow prevention automatic valve are sequentially connected to the liquid suction pipe in the direction from near the batching tank to near the temperature control chamber;

[0013] The feeding component includes a feeding pipe, a gas-liquid automatic control valve, a gas-liquid booster pump, a gas-liquid output manual control valve, and a gas-liquid output electronic valve. Both ends of the gas-liquid booster pump are connected to the temperature control chamber and the in-situ formation temperature and pressure simulation system respectively through the feeding pipe. The gas-liquid automatic control valve is arranged on the feeding pipe between the temperature control chamber and the gas-liquid booster pump. The gas-liquid output manual control valve and the gas-liquid output electronic valve are arranged on the feeding pipe between the gas-liquid booster pump and the in-situ formation temperature and pressure simulation system. The gas-liquid output manual control valve and the gas-liquid output electronic valve are arranged in parallel.

[0014] Further, the high-temperature nitrogen injection system includes a nitrogen tank, a one-way electronic valve, a temperature control chamber, a temperature control electronic valve, a gas booster pump, and a nitrogen output electronic valve;

[0015] The one-way electronic valve is arranged on the pipeline connecting the nitrogen tank and the temperature control chamber. The temperature control electronic valve is arranged on the pipeline connecting the temperature control chamber and the gas booster pump. The nitrogen output electronic valve is arranged on the pipeline connecting the gas booster pump and the in-situ formation temperature and pressure simulation system.

[0016] Further, the in-situ formation temperature and pressure simulation system includes an observation window, a sample chamber, a pinhole camera, a main static rock pressure rod, a secondary static rock pressure rod, a main control rock pressure rod, and a secondary control rock pressure rod;

[0017] The observation window is arranged on the side wall of the sample chamber. The pinhole camera is arranged inside the sample chamber. The main static rock pressure rod and the secondary static rock pressure rod are respectively arranged at one end of the sample chamber. A cylindrical through hole is arranged inside the main static rock pressure rod, and the secondary static rock pressure rod is arranged inside the cylindrical through hole. The main control rock pressure rod and the secondary control rock pressure rod are respectively arranged at the other end of the sample chamber. A cylindrical through hole is arranged inside the main control rock pressure rod, and the secondary control rock pressure rod is arranged inside the cylindrical through hole.

[0018] Further, the product collection system includes an exhaust electronic valve, a heat capacity chamber, a gas-liquid separation valve, a liquid discharge valve, a nitrogen-hydrocarbon gas separation manual valve, a gas collection manual valve, a gas-liquid separation tank, a gas collection pump, a pressure sensor, a gas collection valve, an automatic gas meter, a gas collection tank, a carbon molecular sieve membrane, and a polymer sieve membrane;

[0019] The heat capacity chamber is connected to the in-situ formation temperature and pressure simulation system through the exhaust electronic valve. The gas-liquid separation tank is connected to the heat capacity chamber through the gas-liquid separation valve. The gas-liquid separation valve is connected to the in-situ formation temperature and pressure simulation system through the liquid discharge valve. The gas-liquid separation tank is respectively connected to the carbon molecular sieve membrane and the polymer sieve membrane through the nitrogen-hydrocarbon gas separation manual valve. The gas collection pump and the pressure sensor are connected to the polymer sieve membrane through the gas collection manual valve. The automatic gas meter and the gas collection tank are connected to the gas collection pump through the gas collection valve.

[0020] Further, the high-temperature nitrogen injection system, the fluid configuration system, and the product collection system are respectively connected to the sample chamber in the in-situ formation temperature and pressure simulation system.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. Through the modular combination of four core systems of the present invention, namely the high-temperature nitrogen injection system, the fluid configuration system, the in-situ formation temperature and pressure simulation system, and the product collection system, the compatibility of the in-situ pyrolysis, hydrocarbon generation simulation, water-rock reaction, and element migration experiments of rich oil coal is realized;

[0023] 2. Through valve switching, such as valve control under fully enclosed / semi-enclosed / open conditions and selective activation of subsystems, such as only partial pressure rods are required for small-scale experiments, the versatility of the equipment is significantly improved, and fluid solutions can be automatically configured, as well as nitrogen and small-molecule hydrocarbon gases can be separated and collected. Brief Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the system structure of an embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the high-temperature nitrogen injection system of an embodiment of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the fluid configuration system of an embodiment of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the in-situ formation temperature and pressure simulation system of an embodiment of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the product collection system of an embodiment of the present invention.

[0029] In the figure: 101 - reagent tank, 102 - automatic switch hole, 103 - material control automatic valve, 104 - stirring fan blade, 105 - stirring micro-rotor, 106 - stirring motor, 107 - fluid flowmeter, 108 - flow rate automatic control valve, 109 - liquid suction pump, 110 - anti-backflow automatic control valve, 111 - temperature control chamber, 112 - gas-liquid automatic control valve, 113 - gas-liquid booster pump, 114 - gas-liquid output manual control valve, 115 - gas-liquid output electronic valve, 116 - batching tank;

[0030] 201 - nitrogen tank, 202 - one-way electronic valve, 203 - temperature control chamber, 204 - temperature control electronic valve, 205 - gas booster pump, 206 - nitrogen output electronic valve;

[0031] 301 - observation window, 302 - sample chamber, 303 - pinhole camera, 304 - main static rock pressure rod, 305 - auxiliary static rock pressure rod, 306 - main control rock pressure rod, 307 - auxiliary control rock pressure rod;

[0032] 401 - exhaust electronic valve, 402 - heat capacity chamber, 403 - gas-liquid separation valve, 404 - drain valve, 405 - nitrogen-hydrocarbon gas separation manual valve, 406 - gas collection manual valve, 407 - gas-liquid separation tank, 408 - gas collection pump, 409 - air pressure sensor, 410 - gas collection valve, 411 - automatic gas meter, 412 - gas collection tank, 413 - carbon molecular sieve membrane, 414 - polymer sieve membrane. Specific implementation manner

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0034] The technical solution provided by the present invention: a system for in-situ pyrolysis and multi-process simulation experiment of rich oil coal underground, including a high-temperature nitrogen injection system, a fluid configuration system, an in-situ formation temperature and pressure simulation system, and a product collection system;

[0035] Among them, the high-temperature nitrogen injection system injects high-temperature nitrogen into the in-situ formation temperature and pressure simulation system, the fluid configuration system is used to prepare the required fluid solution and inject it into the in-situ formation temperature and pressure simulation system, the in-situ formation temperature and pressure simulation system is used to hold the materials required for the experiment and simulate the temperature and pressure required for the experiment, and the product collection system collects and separates the materials generated by the experiment.

[0036] It should be noted that: the modular combination of the four core systems, namely the high-temperature nitrogen injection system, the fluid configuration system, the in-situ formation temperature and pressure simulation system, and the product collection system, realizes the compatibility of the in-situ pyrolysis, hydrocarbon generation simulation, water-rock reaction, and element migration experiments of rich oil coal. Through this device, the physical and chemical changes during the in-situ pyrolysis of rich oil coal underground can be deeply studied, providing a scientific basis for the efficient development and utilization of rich oil coal resources. At the same time, these problems can be effectively solved, and the experimental efficiency and research depth can be improved.

[0037] In a further implementation manner of this embodiment, the fluid configuration system includes a reagent tank 101, a batching tank 116, a stirring assembly, a liquid suction assembly, a temperature control chamber 111, and a feeding assembly;

[0038] A plurality of reagent tanks 101 are respectively connected to the batching tank 116. The stirring assembly is arranged on the batching tank 116. The two ends of the liquid suction assembly are respectively connected to the batching tank 116 and the temperature control chamber 111, and the temperature control chamber 111 is connected to the in-situ formation temperature and pressure simulation system through the feeding assembly;

[0039] Among them, the reagent tank 101 is used to hold the required reagents. The liquid suction assembly is used to suck the fluid in the batching tank 116 into the temperature control chamber 111, and the feeding assembly is used to send the fluid in the temperature control chamber 111 into the in-situ formation temperature and pressure simulation system.

[0040] In a further implementation manner of this embodiment, the fluid configuration system further includes a medicine delivery assembly;

[0041] The medicine delivery assembly includes a medicine delivery pipe, a material control automatic valve 103, and a micro weight sensor. The delivery pipe is connected to the reagent tank 101 through an automatic switch hole 102. The material control automatic valve 103 is arranged in the delivery pipe, and the micro weight sensor is arranged on the material control automatic valve 103.

[0042] In a further implementation manner of this embodiment, the stirring assembly includes a stirring motor 106, a stirring fan blade 104, and a stirring micro blade 105. The stirring motor 106 drives the stirring fan blade 104 and the stirring micro blade 105 to rotate respectively. The stirring fan blade 104 and the stirring micro blade 105 are both arranged in the batching tank 116.

[0043] In a further implementation manner of this embodiment, the liquid suction assembly includes a liquid suction pipe, a fluid flowmeter 107, a flow rate automatic control valve 108, a liquid suction pump 109, and a backflow prevention automatic control valve 110. The fluid flowmeter 107, the flow rate automatic control valve 108, the liquid suction pump 109, and the backflow prevention automatic control valve 110 are sequentially connected to the liquid suction pipe from the direction close to the batching tank 116 to the direction close to the temperature control chamber 111;

[0044] The feeding assembly includes a feeding pipe, a gas-liquid automatic control valve 112, a gas-liquid booster pump 113, a gas-liquid output manual control valve 114, and a gas-liquid output electronic valve 115. Both ends of the gas-liquid booster pump 113 are respectively connected to the temperature control chamber 111 and the in-situ formation temperature and pressure simulation system through the feeding pipe. The gas-liquid automatic control valve 112 is arranged on the feeding pipe between the temperature control chamber 111 and the gas-liquid booster pump 113. The gas-liquid output manual control valve 114 and the gas-liquid output electronic valve 115 are arranged on the feeding pipe between the gas-liquid booster pump 113 and the in-situ formation temperature and pressure simulation system, and the gas-liquid output manual control valve 114 and the gas-liquid output electronic valve 115 are arranged in parallel.

[0045] It should be noted that: during use, by analyzing the water quality components in the in-situ formation fluid, appropriate chemicals are selected and placed in different chemical tanks 101. The automatic switch hole 102 is controlled by the automatic control system, and the chemical is dropped above the material control automatic valve 103. A micro weight sensor is provided on the material control automatic valve 103. When the micro weight sensor on the material control automatic valve 103 senses that the weight of the chemical reaches the set weight, the automatic switch hole 102 is closed, and then the material control automatic valve 103 is automatically controlled to open. At this time, different chemicals all fall into the solvent proportioning tank 116.

[0046] Since different chemicals and the solution in the proportioning tank 116 are controlled according to the proportion of the water quality components in the formation fluid, only the stirring motor 106 needs to be used to drive the stirring fan blade 104 and the stirring micro rotor 105. After sufficient stirring, a solution consistent with the components in the formation fluid can be prepared. Then, the flow control automatic valve 108 and the anti-backflow automatic control valve 110 are opened, and the prepared solution is injected into the temperature control chamber 111 by using the liquid suction pump 109. At this time, the fluid flowmeter 107 can record the amount of the inhaled fluid.

[0047] After the flow enters the temperature control chamber 111, the chamber in the temperature control chamber 111 will automatically heat up to the corresponding formation temperature. When the temperature is too high, it may turn into steam. Therefore, the anti-backflow automatic control valve 110 is closed during the heating process.

[0048] After heating is completed, the gas-liquid automatic control valve 112 is opened, and the heated gas-liquid is inhaled into the gas-liquid booster pump 113, and the pressure is increased to the corresponding formation pressure in the gas-liquid booster pump 113. Finally, it is input into the sample chamber 302 through the gas-liquid output manual control valve 114 or the gas-liquid output electronic valve 115. The setting of the parallel double-valve control can prevent the gas-liquid pressure from being too high and the gas-liquid output electronic valve 115 from malfunctioning, and the gas-liquid output manual control valve 114 is used as the insurance control.

[0049] In a further implementation manner of this embodiment, the high-temperature nitrogen injection system includes a nitrogen tank 201, a one-way electronic valve 202, a temperature control chamber 203, a temperature control electronic valve 204, a gas booster pump 205, and a nitrogen output electronic valve 206;

[0050] The one-way electronic valve 202 is arranged on the pipeline connecting the nitrogen tank 201 and the temperature control chamber 203. The temperature control electronic valve 204 is arranged on the pipeline connecting the temperature control chamber 203 and the gas booster pump 205. The nitrogen output electronic valve 206 is arranged on the pipeline connecting the gas booster pump 205 and the in-situ formation temperature and pressure simulation system.

[0051] It should be noted that during use, nitrogen is output from the nitrogen tank 201 and enters the temperature control chamber 203 through the one-way electronic valve 202. When the temperature control chamber 203 receives a set amount of nitrogen, the one-way electronic valve 202 is automatically closed and the nitrogen in the temperature control chamber 203 starts to be heated to the nitrogen temperature required for the experiment, and the heat value of the heating is recorded to facilitate subsequent calculation of the heat transfer efficiency. After the heating is completed, the temperature control electronic valve 204 is automatically opened and the gas is sucked into the gas booster pump 205. At this time, the nitrogen is pressurized to a pressure slightly higher than the formation pressure. The nitrogen output single valve 206 is automatically controlled to open, facilitating smooth filling into the sample chamber 302.

[0052] In a further implementation manner of this embodiment, the in-situ formation temperature and pressure simulation system includes an observation window 301, a sample chamber and a pinhole camera 303, a main static rock pressure rod 304, a secondary static rock pressure rod 305, a main control rock pressure rod 306 and a secondary control rock pressure rod 307;

[0053] The observation window 301 is arranged on the side wall of the sample chamber 302. The pinhole camera 303 is arranged inside the sample chamber 302. The main static rock pressure rod 304 and the secondary static rock pressure rod 305 are respectively arranged at one end of the sample chamber 302. A cylindrical through hole is arranged inside the main static rock pressure rod 304. The secondary static rock pressure rod 305 is arranged inside the cylindrical through hole. The main control rock pressure rod 306 and the secondary control rock pressure rod 307 are respectively arranged at the other end of the sample chamber 302. A cylindrical through hole is arranged inside the main control rock pressure rod 306. The secondary control rock pressure rod 307 is arranged inside the cylindrical through hole.

[0054] It should be noted that: when conducting in-situ pyrolysis experiments on super-large rich oil coal, the super-large rich oil coal (for example, with a diameter of 1 m) is placed in the sample chamber 302 from the upper part, and the size of the sample chamber 302 is designed to fit the sample according to actual requirements. After loading the sample, copper rings and graphite rings of appropriate sizes are added above and below to form a relatively sealed environment, and a filter plate is added to filter out the formed oil and gas. Pressure is applied to the sample through the main confining pressure rod 304, the auxiliary confining pressure rod 305, the main control rock pressure rod 306, and the auxiliary control rock pressure rod 307. Among them, the main confining pressure rod 304 and the auxiliary confining pressure rod 305 are used to simulate formation pressure, and the main control rock pressure rod 306 and the auxiliary control rock pressure rod 307 serve as supporting fitting pressures. The sample chamber 302 is equipped with a heating device that can raise the temperature to the corresponding formation temperature of the experiment. The observation window 301 is on the chamber body of the sample chamber 302 and is made of quartz glass resistant to high temperature and high pressure, facilitating experimental personnel to observe the experimental conditions with the naked eye. The pinhole camera 303 is arranged inside the chamber body of the sample chamber 302, so that the whole experiment process can be monitored internally throughout the experiment.

[0055] When conducting small-scale hydrocarbon generation simulation experiments, as well as water-rock simulation and element migration experiments, the required size of the chamber body of the sample chamber 302 is relatively small. Therefore, only the auxiliary confining pressure rod 5 and the auxiliary main control rock pressure rod 7 are needed to provide the corresponding formation pressure.

[0056] In a further embodiment of this embodiment, the product collection system includes an exhaust electronic valve 401, a heat capacity chamber 402, a gas-liquid separation valve 403, a drain valve 404, a nitrogen-hydrocarbon gas separation manual valve 405, a gas collection manual valve 406, a gas-liquid separation tank 407, a gas collection pump 408, a pressure sensor 409, a gas collection valve 410, an automatic gas meter 411, a gas collection tank 412, a carbon molecular sieve membrane 413, and a polymer sieve membrane 414;

[0057] The heat capacity chamber 402 is connected to the in-situ formation temperature and pressure simulation system through the exhaust electronic valve 401. The gas-liquid separation tank 407 is connected to the heat capacity chamber 402 through the gas-liquid separation valve 403. The gas-liquid separation valve 403 is connected to the in-situ formation temperature and pressure simulation system through the drain valve 404. The gas-liquid separation tank 407 is respectively connected to the carbon molecular sieve membrane 413 and the polymer sieve membrane 414 through the nitrogen-hydrocarbon gas separation manual valve 405. The gas collection pump 408 and the pressure sensor 409 are connected to the polymer sieve membrane 414 through the gas collection manual valve 406. The automatic gas meter 411 and the gas collection tank 412 are connected to the gas collection pump 408 through the gas collection valve 410.

[0058] It should be noted that: Since the experimental object is rich oil coal and the products contain abundant hydrocarbon gases, two pipelines are designed to be connected to the sample chamber 302 simultaneously. One pipeline is controlled by an oil discharge valve 404 at the lower part and is mainly used for oil collection. The other pipeline is controlled by an exhaust valve 405 at the upper part and is mainly used for gas collection. The purpose of setting two pipelines is to reduce the product collection pressure, rather than the oil and gas being able to be split here. Because part of the oil is produced in the form of gas under high temperature and high pressure, a device for oil and gas separation is also set up later.

[0059] When the experimental sample in the sample chamber 302 is just heated and pressurized to a fixed temperature, nitrogen gas at the temperature set in the simulation experiment is introduced at this time. The rich oil coal is heated by the nitrogen gas. At this time, the products are less. The exhaust electronic valve 401 is opened, and the gas-liquid separation valve 403 is closed. The nitrogen gas after heating is collected into the heat capacity chamber 402 to obtain the remaining heat value after heating.

[0060] The heat value before heating can be calculated. By comparing the two heat values, the heat transfer efficiency of the nitrogen gas heating the rich oil coal can be obtained. After obtaining the heat transfer efficiency, nitrogen gas is continuously introduced to heat the rich oil coal. At this time, all the valves of the product collection system are opened. When the gas product passes through the gas-liquid separation valve 403 and enters the gas-liquid separation tank 407 (cold trap), the high-molecular hydrocarbon substances in the form of gas under high temperature and high pressure are separated by the gas-liquid separation tank 407 at this time. The small-molecular hydrocarbon products and the nitrogen gas continue to move forward. When passing through the nitrogen-hydrocarbon gas separation manual valve 405, since the carbon molecular sieve membrane 413 only allows nitrogen gas to pass through and does not allow hydrocarbon gases with larger molecules to pass through, and hydrocarbon gases can pass through the polymer sieve membrane 414 (such as polyimide) while nitrogen gas cannot pass through. Through the combined action of the carbon molecular sieve membrane 413 and the polymer sieve membrane 414, the hydrocarbon products in the experiment can be split from the nitrogen gas used in the experiment as an aid. The split nitrogen gas can be directly discharged into the external air harmlessly after being cooled by the cold trap.

[0061] The small-molecular hydrocarbon products continue to move forward. After passing through the gas collection manual valve 406 and the gas collection valve 410, they are injected into the gas collection tank 412. The gas injection volume is recorded by the automatic gas meter 411. When the experiment reaches the end and the experimental oil and gas are basically collected, there is still residual oil and gas in the pipeline at this time. At this time, by coordinating the opening and closing of the valves, the gas collection pump 408 first exhausts and then sucks in to be in a negative pressure state, sucking out the remaining oil and gas to achieve as accurate a collection of the product quantity as possible.

[0062] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. An in-situ pyrolysis and multi-process simulation experimental system for rich oil coal underground, characterized in that It includes a high-temperature nitrogen injection system, a fluid configuration system, an in-situ formation temperature and pressure simulation system, and a product collection system; Among them, the high-temperature nitrogen injection system injects high-temperature nitrogen into the in-situ formation temperature and pressure simulation system. The fluid configuration system is used to prepare the required fluid solution and inject it into the in-situ formation temperature and pressure simulation system. The in-situ formation temperature and pressure simulation system is used to hold the materials required for the experiment and simulate the temperature and pressure required for the experiment. The product collection system collects and separates the materials generated by the experiment.

2. The in-situ pyrolysis and multi-process simulation experimental system for rich oil coal underground according to claim 1, wherein: The fluid configuration system includes a reagent tank, a batching tank, a stirring assembly, a liquid suction assembly, a temperature control chamber, and a feeding assembly; Multiple reagent tanks are respectively connected to the batching tank. The stirring assembly is arranged on the batching tank. Both ends of the liquid suction assembly are respectively connected to the batching tank and the temperature control chamber. The temperature control chamber is connected to the in-situ formation temperature and pressure simulation system through the feeding assembly; Among them, the reagent tank is used to hold the required reagents. The liquid suction assembly is used to suck the fluid in the batching tank into the temperature control chamber. The feeding assembly is used to send the fluid in the temperature control chamber into the in-situ formation temperature and pressure simulation system.

3. The in-situ pyrolysis and multi-process simulation experimental system for rich oil coal underground according to claim 2, characterized in that: The fluid configuration system also includes a medicine delivery assembly; The medicine delivery assembly includes a medicine delivery pipe, a material control automatic valve, and a micro weight sensor. The delivery pipe is connected to the reagent tank through an automatic switch hole. The material control automatic valve is arranged in the delivery pipe. The micro weight sensor is arranged on the material control automatic valve.

4. The in-situ pyrolysis of rich oil coal underground and multi-process simulation experimental system according to claim 2, characterized in that: The stirring assembly includes a stirring motor, stirring fan blades, and stirring micro blades. The stirring motor drives the stirring fan blades and the stirring micro blades to rotate respectively. The stirring fan blades and the stirring micro blades are both arranged in the batching tank.

5. The in-situ pyrolysis and multi-process simulation experimental system for rich oil coal underground according to claim 2, characterized in that: The liquid suction assembly includes a liquid suction pipe, a fluid flowmeter, a flow control automatic valve, a liquid suction pump, and a backflow prevention automatic valve. The fluid flowmeter, the flow control automatic valve, the liquid suction pump, and the backflow prevention automatic valve are sequentially connected to the liquid suction pipe in the direction from close to the batching tank to close to the temperature control chamber; The feeding assembly includes a feeding pipe, a gas-liquid automatic valve, a gas-liquid booster pump, a gas-liquid output manual control valve, and a gas-liquid output electronic valve. Both ends of the gas-liquid booster pump are respectively connected to the temperature control chamber and the in-situ formation temperature and pressure simulation system through the feeding pipe. The gas-liquid automatic valve is arranged on the feeding pipe between the temperature control chamber and the gas-liquid booster pump. The gas-liquid output manual control valve and the gas-liquid output electronic valve are arranged on the feeding pipe between the gas-liquid booster pump and the in-situ formation temperature and pressure simulation system. The gas-liquid output manual control valve and the gas-liquid output electronic valve are arranged in parallel.

6. The in-situ underground pyrolysis and multi-process simulation experimental system for rich oil coal according to claim 1, characterized in that: The high-temperature nitrogen injection system includes a nitrogen tank, a one-way electronic valve, a temperature control chamber, a temperature control electronic valve, a gas booster pump, and a nitrogen output electronic valve; The one-way electronic valve is arranged on the pipeline connecting the nitrogen tank and the temperature control chamber. The temperature control electronic valve is arranged on the pipeline connecting the temperature control chamber and the gas booster pump. The nitrogen output electronic valve is arranged on the pipeline connecting the gas booster pump and the in-situ formation temperature and pressure simulation system.

7. The in-situ underground pyrolysis and multi-process simulation experimental system for rich oil coal according to claim 1, characterized in that: The in-situ formation temperature and pressure simulation system includes an observation window, a sample chamber, a pinhole camera, a main confining pressure rod, a secondary confining pressure rod, a main control rock pressure rod, and a secondary control rock pressure rod; The observation window is arranged on the side wall of the sample chamber, the pinhole camera is arranged inside the sample chamber, the main confining pressure rod and the secondary confining pressure rod are respectively arranged at one end of the sample chamber, a cylindrical through hole is arranged inside the main confining pressure rod, the secondary confining pressure rod is arranged inside the cylindrical through hole, the main controlled confining pressure rod and the secondary controlled confining pressure rod are respectively arranged at the other end of the sample chamber, a cylindrical through hole is arranged inside the main controlled confining pressure rod, and the secondary controlled confining pressure rod is arranged inside the cylindrical through hole.

8. The in-situ pyrolysis and multi-process simulation experimental system for rich oil coal underground according to claim 1, wherein: The product collection system includes an exhaust electronic valve, a heat capacity chamber, a gas-liquid separation valve, a liquid discharge valve, a nitrogen-hydrocarbon gas separation manual valve, a gas collection manual valve, a gas-liquid separation tank, a gas collection pump, a pressure sensor, a gas collection valve, an automatic gas meter, a gas collection tank, a carbon molecular sieve membrane and a polymer sieve membrane; The heat capacity chamber is connected to the in-situ formation temperature and pressure simulation system through the exhaust electronic valve, the gas-liquid separation tank is connected to the heat capacity chamber through the gas-liquid separation valve, the gas-liquid separation valve is connected to the in-situ formation temperature and pressure simulation system through the liquid discharge valve, the gas-liquid separation tank is respectively connected to the carbon molecular sieve membrane and the polymer sieve membrane through the nitrogen-hydrocarbon gas separation manual valve, the gas collection pump and the pressure sensor are connected to the polymer sieve membrane through the gas collection manual valve, and the automatic gas meter and the gas collection tank are connected to the gas collection pump through the gas collection valve.

9. The in-situ pyrolysis of rich oil coal underground and multi-process simulation experimental system according to claim 7, characterized in that: The high-temperature nitrogen injection system, the fluid configuration system and the product collection system are respectively connected to the sample chamber in the in-situ formation temperature and pressure simulation system.

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