Injection mode simulation device for coal bed gas low-yield well biological stimulation liquid

Abstract

This application discloses a simulation device for the injection mode of bio-enhancing fluid in low-yield coalbed methane wells, solving the technical problem that existing technologies cannot simulate the injection mode. It includes a housing, a simulated coal sample, a bacterial solution storage structure, a biogas extraction and collection device, a liquid diffusion range detection device, and a coal sample pore pressure detection device. The simulated coal sample is filled into the housing. The bacterial solution storage structure is used to inject the bio-enhancing fluid into the housing. The biogas extraction and collection device is used to collect the gas generated in the housing. The liquid diffusion range detection device includes a resistivity detector and several metal particles, used to detect the diffusion range of the bio-enhancing fluid in the simulated coal sample. The coal sample pore pressure detection device is used to detect the pore pressure in the simulated coal sample. The simulation device for the injection mode of bio-enhancing fluid in low-yield coalbed methane wells disclosed in this application can simulate the injection mode of bio-enhancing fluid under various coal seam structures, thereby selecting the optimal injection mode suitable for different coal seam structures.

Description

Technical Field

[0001] This application belongs to the field of coalbed methane biotechnology, specifically relating to a device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells. Background Technology

[0002] Coalbed methane (CBM), as a new type of clean energy, is of great significance for meeting the ever-increasing energy demand through its scientific and rational development and utilization. While traditional fracturing techniques can effectively improve CBM recovery rates, after prolonged production, the gas content within the fracturing borehole decreases, leading to a significant drop in production efficiency and the emergence of low-production CBM wells. Bio-enhanced production technology, as a novel method for coal reservoir stimulation, involves injecting nutrients or nutrient solutions containing methanogenic bacteria into the coal seam. Anaerobic fermentation converts a portion of the coal into methane, thereby increasing the production of CBM wells.

[0003] However, there is currently a lack of relevant structures to simulate the optimal injection method of bio-enhancing fluid under different coal seam structures. Summary of the Invention

[0004] To address the aforementioned technical problems, this application aims to provide a device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells. This device can simulate the bio-enhancing fluid injection process under anaerobic conditions and monitor the diffusion of the bio-enhancing fluid in simulated coal samples as well as the changes in pore pressure of the coal samples.

[0005] The technical solution adopted to achieve the purpose of this application is as follows: This application discloses a device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells, comprising:

[0006] The enclosure is an anaerobic environment.

[0007] Simulated coal samples are filled into the box.

[0008] A bacterial culture storage structure is used to inject a bio-enhancing solution into the container;

[0009] A biogas treatment structure for collecting gases generated in the chamber;

[0010] A liquid diffusion range detection structure, including a resistivity detector and several metal particles, is used to detect the diffusion range of the bio-enhancing liquid in the simulated coal sample; and

[0011] A coal sample pore pressure detection structure is used to detect the pore pressure in the simulated coal sample.

[0012] In some embodiments, the box body is provided with a first pipe, a first end of the first pipe extending into the box body and extending to the bottom of the box body, and a second end of the first pipe communicating with the bacterial liquid storage structure.

[0013] In some embodiments, the housing is further provided with a second pipe, the first end of which is connected to the first pipe, and the second end of which is connected to the biogas treatment structure.

[0014] In some embodiments, the biogas treatment structure includes a gas collector and a gas analyzer, the gas collector being connected to a second end of the second pipe, and the gas analyzer being connected to the gas collector via a connecting pipe.

[0015] In some embodiments, a flow meter and a first switching valve are provided at the second end of the first pipe, and a second switching valve is provided at the first end of the second pipe.

[0016] In some embodiments, the housing includes an air inlet and an air outlet, and the device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells further includes a nitrogen storage structure, which is connected to the air inlet.

[0017] In some embodiments, the coal sample pore pressure detection structure includes a pore pressure pump and a pressure sensor, the pressure sensor being disposed within the pores of the simulated coal sample.

[0018] In some embodiments, a heater is also included for raising the temperature inside the chamber.

[0019] In some embodiments, the pores of the simulated coal sample are filled with a proppant containing tracer particles.

[0020] In some embodiments, a resistivity detector is installed inside the enclosure.

[0021] As described above, the simulation device for injecting bio-enhancing fluid into low-yield coalbed methane wells disclosed in this application includes a box, a simulated coal sample, a bacterial solution storage structure, a biogas extraction and collection device, a liquid diffusion range detection device, and a coal sample pore pressure detection device. The environment inside the box is anaerobic, and the simulated coal sample is filled within the box. The bacterial solution storage structure is used to inject the bio-enhancing fluid into the box. The biogas extraction and collection device is used to collect the gas generated within the box. The liquid diffusion range detection device includes a resistivity detector and several metal particles, used to detect the diffusion range of the bio-enhancing fluid in the simulated coal sample. The coal sample pore pressure detection device is used to detect the pore pressure in the simulated coal sample.

[0022] The simulation device for injecting bio-enhancing fluid in low-yield coalbed methane wells disclosed in this application uses a liquid diffusion range detection device to detect the liquid diffusion range and a coal sample pore pressure detection device to detect fracture closure. It involves multiple injections of the bio-enhancing fluid, monitoring various parameters during each injection, collecting the generated gas, and analyzing its composition and concentration to determine the gas production effect. This simulation device can simulate the injection methods of bio-enhancing fluid under various coal seam structures, thereby selecting the optimal injection method suitable for different coal seam structures. Attached Figure Description

[0023] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] Figure 1 This is a schematic diagram of a device simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells, as described in one or more embodiments of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100-Box body, 110-First pipe, 120-Second pipe, 130-Flow meter, 140-First switching valve, 150-Second switching valve, 160-Air inlet, 170-Air outlet, 200-Simulated coal sample, 300-Bacterial liquid storage structure, 400-Biogas treatment structure, 410-Gas collector, 420-Gas analyzer, 500-Liquid diffusion range detection structure, 600-Coal sample pore pressure detection structure, 610-Pore pressure pump, 620-Pressure sensor, 700-Nitrogen storage structure, 800-Resistivity detector, 900-Heater. Detailed Implementation

[0027] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0028] Furthermore, reference numerals and / or reference letters may be repeated in different examples in this application. Such repetition is for simplification and clarity purposes and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0030] When bio-enhancing treatment is used to improve the gas production efficiency of low-yield coalbed methane wells, the injection method, including the injection speed and interval, will affect the diffusion range of the fractures and bio-enhancing fluid generated during the initial treatment, and ultimately affect the effect of the enhancement treatment.

[0031] This invention discloses a device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells, which can solve the technical problem that existing technologies cannot simulate the injection method. This device can simulate the optimal injection method of bio-enhancing fluid under different coal seam structures, including injection speed and interval time. It can also experimentally simulate the pore and fracture closure of the coal seam, preliminarily determine the injection effect, and determine the diffusion range of the bio-enhancing fluid in the coal seam.

[0032] The technical solution of this application will be described in detail below through specific embodiments:

[0033] See Figure 1 This application discloses a simulation device for injecting bio-enhancing fluid into low-yield coalbed methane wells, comprising a chamber 100, a simulated coal sample 200, a bacterial solution storage structure 300, a biogas extraction and collection device, a liquid diffusion range detection device, and a coal sample pore pressure detection device. The chamber environment is anaerobic, and the simulated coal sample 200 is filled within the chamber 100. The bacterial solution storage structure 300 is used to inject the bio-enhancing fluid into the chamber 100. The biogas extraction and collection device is used to collect the gas generated in the chamber 100. The liquid diffusion range detection device includes a resistivity detector 800 and several metal particles, used to detect the diffusion range of the bio-enhancing fluid in the simulated coal sample 200. The coal sample pore pressure detection device is used to detect the pore pressure in the simulated coal sample 200.

[0034] The simulation device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells disclosed in this embodiment detects the liquid diffusion range using a liquid diffusion range detection device and the fracture closure status using a coal sample pore pressure detection device. It also monitors various parameters during each injection by injecting the bio-enhancing fluid, collecting the generated gas, and analyzing its composition and concentration to determine the gas production effect. This simulation device can simulate the injection methods of bio-enhancing fluid in low-yield coalbed methane wells under various coal seam structures, thereby selecting the optimal injection method suitable for different coal seam structures.

[0035] In one embodiment, a first pipe 110 is provided on the box 100, the first end of the first pipe 110 extends into the box 100 and extends to the bottom of the box 100, and the second end of the first pipe 110 is connected to the bacterial liquid storage structure 300.

[0036] The first end of the first conduit 110 extends to the bottom of the housing 100, ensuring that the bio-enhancing fluid can be injected from the bottom of the simulated coal sample 200. This design helps to study the effect of different injection locations on the bio-enhancing effect, especially when it is necessary to simulate the situation of injecting bio-enhancing fluid from the bottom up in an actual coal seam.

[0037] In one embodiment, the housing 100 is further provided with a second pipe 120, the first end of the second pipe 120 being connected to the first pipe 110, and the second end of the second pipe 120 being connected to the biogas treatment structure 400.

[0038] This design allows biogases generated during the experiment to be directly collected and analyzed in the biogas treatment structure 400 via the second pipe 120. It eliminates the need for additional gas collection devices or complex connection systems, simplifying the experimental process and improving efficiency. Real-time collection and analysis of biogases helps to understand the metabolic activities of microorganisms and the composition of gases produced during bioyield enhancement, providing crucial data for evaluating the effectiveness of bioyield enhancement.

[0039] The timely removal of biogas through the second pipe 120 helps maintain the anaerobic environment within chamber 100, preventing gas accumulation from interfering with experimental results. An anaerobic environment is essential for microbial metabolism during biomass enhancement; therefore, controlling the anaerobic state of the experimental environment is crucial for accurately evaluating the biomass enhancement effect.

[0040] Real-time collection and analysis of biogas can promptly detect anomalies during experiments, such as abnormal changes in microbial metabolic activity or the failure of bio-enhancing solutions. This helps to adjust experimental parameters in a timely manner and optimize the injection methods and conditions of the bio-enhancing solution, thereby improving the accuracy and reliability of experimental results.

[0041] In one embodiment, the biogas treatment structure 400 includes a gas collector 410 and a gas analyzer 420. The gas collector 410 is connected to the second end of the second pipe 120, and the gas analyzer 420 is connected to the gas collector 410 through a connecting pipe.

[0042] The gas collector 410 is directly connected to the second end of the second pipe 120, ensuring that the biogas generated during the experiment can enter the gas collector 410 quickly and completely. An appropriate separation device can be designed inside the gas collector 410 for preliminary separation and purification of the biogas, reducing interference factors in subsequent analysis.

[0043] The gas analyzer 420 may employ advanced detection technologies, such as gas chromatography and mass spectrometry, to accurately determine the composition and content of biogas, providing crucial data for evaluating the effects of bio-yield enhancement.

[0044] The design of the gas collector 410 and the gas analyzer 420 may take into account the stability and safety requirements of the experimental environment. For example, the gas collector 410 may have a leak-proof design to ensure that the anaerobic state of the experimental environment is not affected by gas leakage during the experiment; the gas analyzer 420 may be equipped with safety protection devices to prevent harmful gases that may be generated during the experiment from causing harm to human beings and the environment.

[0045] In one embodiment, a flow meter 130 and a first switching valve 140 are provided at the second end of the first pipe 110, and a second switching valve 150 is provided at the first end of the second pipe 120.

[0046] The flow meter 130 can monitor and record the flow rate of the bio-enhancing solution through the first pipe 110 in real time, ensuring that the amount of liquid injected during the experiment meets the preset requirements. By adjusting the opening of the first switching valve 140, the injection rate of the bio-enhancing solution can be precisely controlled, thereby simulating the effect of different injection rates on the bio-enhancing effect.

[0047] The first switching valve 140 and the second switching valve 150 allow researchers to open or close the pipeline at any time as needed to adjust the injection of bio-enhancing solution and the emission of biogas. This flexibility helps in studying the effects of bio-enhancing solution under different injection and emission conditions and optimizing experimental conditions.

[0048] The first switching valve 140 and the second switching valve 150 can be quickly closed in an emergency to prevent accidental leakage of bio-enhancing liquid or biogas.

[0049] In one embodiment, the housing 100 includes an air inlet 160 and an air outlet 170. The device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells also includes a nitrogen storage structure 700, which is connected to the air inlet 160.

[0050] The placement of the air inlet 160 and air outlet 170 allows for effective control of the gas environment within the chamber 100. By adjusting the opening and closing of the air inlet 160 and air outlet 170, an anaerobic environment within the chamber 100 can be maintained, which is crucial for the growth and metabolism of microorganisms. The nitrogen storage structure 700 is connected to the air inlet 160, allowing nitrogen to be introduced into the chamber 100 as an inert gas to displace the oxygen within the chamber 100, thereby further ensuring the stability of the anaerobic environment.

[0051] In one embodiment, the coal sample pore pressure detection device includes a pore pressure pump 610 and a pressure sensor 620, the pressure sensor 620 being disposed within the pores of the simulated coal sample 200. However, in practical applications, the pore pressure pump 610 may not be the only way to apply pore pressure.

[0052] Pore ​​pressure detection typically relies on high-precision pressure sensors 620, which are capable of measuring fluid pressure within the pores of rock or coal samples. Pore pressure pumps 610 are more commonly used to apply pressure to coal or rock samples to simulate underground conditions or to conduct pressure tests.

[0053] In the simulation apparatus, pore pressure sensors 620 can be used to accurately measure the pore pressure in the coal sample. These sensors can be directly connected to the pores or fractures in the coal sample. A pore pressure pump 610 may be used to apply a certain initial pressure to the coal sample before the experiment begins, or to adjust the pressure during the experiment to simulate different underground conditions.

[0054] In one embodiment, the device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells further includes a heater 900, which is used to raise the temperature inside the chamber 100, thereby controlling and maintaining the temperature inside the chamber 100 to simulate the bio-enhancing process under different temperature conditions.

[0055] The heater 900 can precisely control the temperature inside the chamber 100, ensuring it reaches and remains within a preset range. This is crucial for simulating biomass enhancement processes under different temperature conditions, as the metabolic activities of microorganisms and the effectiveness of the biomass enhancement solution can be affected by temperature. Precise temperature control within the chamber 100 via the heater 900 ensures the stability and consistency of temperature factors during the experiment, thereby reducing experimental errors caused by temperature fluctuations.

[0056] In one embodiment, the pores of the simulated coal sample 200 are filled with a proppant containing tracer particles.

[0057] Props with tracer particles play an important role in the petroleum industry. They can not only support formation fractures and prevent them from closing, but also track the movement of fluids in the formation through tracer particles, thereby optimizing extraction strategies.

[0058] The primary function of proppant is to keep formation fractures open, which is crucial for maximizing oil and gas production. It effectively supports fractures, ensuring a smooth flow of oil and gas. Tracer particles, on the other hand, are used to track the path of fluids injected into the formation. By adding tracer particles, engineers can precisely track the destination of injected water, chemicals, or other fluids, thereby optimizing injection strategies and ensuring efficient resource utilization.

[0059] This type of proppant involves injecting a tracer into the proppant particles during the production process. The selection and use of the tracer require precise control to ensure it does not negatively impact the formation or the environment. This proppant not only supports fractures but also has sand-fixing capabilities. It is made by mixing tracer materials, sand-fixing materials, and ceramsite. The tracer material can be consolidated, acting as a sand-fixing agent. Simultaneously, proppant with different dosages of tracer material, under the flushing action of the produced fluid, can qualitatively and quantitatively determine the water content of each fracturing segment, providing a basis for subsequent reservoir analysis and operations. This proppant uses lanthanide phthalocyanine complexes as the main agent, which is loaded onto the outer surface of the proppant carrier through sulfonyl chloride and esterification reactions. It has advantages such as good stability, resistance to precipitation, and minimal decomposition upon heating, allowing the tracer to accurately and effectively reflect the fracturing effect while reducing the amount of tracer used.

[0060] In one embodiment, a resistivity detector 800 is installed inside the housing 100. The resistivity detector 800 (or resistivity measuring instrument, resistivity meter) is a device specifically designed to simulate the injection method of bio-enhancing fluid in low-yield coalbed methane wells for measuring the resistivity of materials.

[0061] The working principle of the resistivity detector 800 is mainly based on Ohm's law. That is, by applying a certain DC voltage to the sample, measuring the current flowing through the sample under that voltage, and then calculating the sample's resistance value according to a formula, combined with the sample's geometric dimensions, the resistivity is finally obtained. Specifically, the power supply in the tester provides a stable DC voltage, which is applied across the sample. Simultaneously, an ammeter measures the current flowing through the sample, and a voltmeter measures the voltage across the sample. The internal circuitry or chip processes and calculates the measured voltage and current values ​​to obtain the resistance value, and further calculates the resistivity based on parameters such as the sample's shape and size.

[0062] Furthermore, the resistivity detector 800 employs high-precision bridge technology and digital processing technology, enabling rapid and accurate testing of the resistivity of various materials. Some versions of the resistivity detector 800 also feature automatic frequency switching to avoid electrode polarization and improve measurement accuracy.

[0063] In one embodiment, the device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells includes a housing 100, a simulated coal sample 200, a bacterial liquid storage structure 300, a biogas treatment structure 400, a liquid diffusion range detection structure 500, a coal sample pore pressure detection structure 600, a pipeline system, a flow meter 130 and a switching valve, a nitrogen storage structure 700, and a heater 900.

[0064] The chamber 100 exposes a closed anaerobic environment to simulate the underground storage conditions of coalbed methane. A simulated coal sample 200 is filled inside the chamber 100 to simulate an actual coal seam. A bacterial culture storage structure 300 is connected to the chamber 100 via a first pipe 110 and is used to store and inject the bio-enhancing liquid into the chamber 100. A biogas treatment structure 400 includes a gas collector 410 and a gas analyzer 420 for collecting and analyzing the gas generated in the chamber 100. A liquid diffusion range detection structure 500 includes a resistivity detector 800 and several metal particles dispersed in the simulated coal sample 200. The resistivity detector 800 is used to detect the diffusion range of the bio-enhancing liquid in the simulated coal sample 200. A coal sample pore pressure detection structure 600 includes a pore pressure pump 610 and a pressure sensor 620. The pressure sensor 620 is placed within the pores of the simulated coal sample 200 to detect the pore pressure in the simulated coal sample 200. The piping system includes a first pipe 110 and a second pipe 120. The first pipe 110 connects the bacterial culture storage structure 300 and the housing 100, and the second pipe 120 connects the housing 100 and the biogas treatment structure 400. A flow meter 130 and a switching valve are installed on the piping system to control and monitor the injection volume of the bio-increasing liquid and the emission of gas. A nitrogen storage structure 700 is connected to the air inlet 160 of the housing 100 to fill the housing 100 with nitrogen and discharge oxygen from the housing 100 through the air outlet 170 to maintain an anaerobic environment. A heater 900 is installed outside or inside the housing 100 to raise and control the temperature inside the housing 100 to simulate the bio-increasing process under different temperature conditions.

[0065] Through the above embodiments, this application has the following beneficial effects or advantages: The simulation device for the injection method of bio-enhancing fluid in low-yield coalbed methane wells disclosed in this application can accurately simulate the optimal injection method of bio-enhancing fluid under different coal seam structures, including injection speed and interval time. By detecting fracture closure and liquid diffusion range, the merits of the injection method can be specifically determined. Compared with field exploration, the experimental simulation method saves time and effort, and can achieve the transformation effect more quickly, providing strong technical support for the bio-enhancing transformation of low-yield coalbed methane wells.

[0066] The simulation device disclosed in this application can simulate the injection process of bio-increase solution under anaerobic conditions and realize the control and maintenance of temperature inside the chamber 100, providing experimental basis for optimizing the injection method of bio-increase solution.

[0067] By setting up a liquid diffusion range detection structure 500 and a coal sample pore pressure detection structure 600, the diffusion of the bio-enhancing liquid in the simulated coal sample 200 and the changes in the pore pressure of the coal sample can be monitored in real time, providing public data support for evaluating the bio-enhancing effect.

[0068] The nitrogen storage structure 700 can further simulate the underground environment and improve the accuracy of the experiment.

[0069] The introduction of heater 900 enables this device to simulate the bio-yield enhancement process under different temperature conditions, making it possible to evaluate the impact of temperature on the bio-yield enhancement effect.

[0070] In practice, simulated coal sample 200 is first filled into chamber 100, and nitrogen is introduced into chamber 100 through nitrogen storage structure 700 to maintain an anaerobic environment. Then, bio-enhancing liquid is injected into chamber 100 through bacterial liquid storage structure 300 and piping system, while heater 900 is activated to raise the temperature inside chamber 100 to a preset value and maintain it at that temperature. During the experiment, the diffusion of the bio-enhancing liquid and changes in the pore pressure of the coal sample can be monitored in real time through liquid diffusion range detection structure 500 and coal sample pore pressure detection structure 600. Finally, the gas generated in chamber 100 is collected and analyzed through biogas treatment structure 400 to evaluate the bio-enhancing effect.

[0071] To simulate the bio-yield enhancement process under different temperature conditions and injection locations, the settings of the heater 900 and the layout of the first pipe 110 can be adjusted to change the temperature within the tank 100 and the injection location of the bio-yield enhancement solution. Furthermore, the injection method of the bio-yield enhancement solution can be further optimized by adjusting parameters such as the injection volume and injection rate.

[0072] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention have been clearly and completely described above with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0073] Therefore, the above detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0074] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0075] In the description of this invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the structure or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0076] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0077] In this invention, unless otherwise expressly specified and limited, "above or below" a first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0078] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0079] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells, characterized in that, include: The enclosure is an anaerobic environment. Simulated coal samples are filled into the box. A bacterial culture storage structure is used to inject a bio-enhancing solution into the container; A biogas treatment structure for collecting gases generated in the chamber; The liquid diffusion range detection structure includes a resistivity detector and several metal particles, used to detect the diffusion range of the bio-enhancing liquid in the simulated coal sample; as well as A coal sample pore pressure detection structure is used to detect the pore pressure in the simulated coal sample.

2. The device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells according to claim 1, characterized in that, The box is provided with a first pipe, the first end of the first pipe extends into the box and extends to the bottom of the box, and the second end of the first pipe is connected to the bacterial liquid storage structure.

3. The device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells according to claim 2, characterized in that, The housing is also equipped with a second pipe, the first end of which is connected to the first pipe, and the second end of which is connected to the biogas treatment structure.

4. The device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells according to claim 3, characterized in that, The biogas treatment structure includes a gas collector and a gas analyzer. The gas collector is connected to the second end of the second pipe, and the gas analyzer is connected to the gas collector through a connecting pipe.

5. The device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells according to claim 3, characterized in that, The second end of the first pipe is equipped with a flow meter and a first switching valve, and the first end of the second pipe is equipped with a second switching valve.

6. The device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells according to any one of claims 1 to 5, characterized in that, The housing includes an air inlet and an air outlet. The device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells also includes a nitrogen storage structure, which is connected to the air inlet.

7. The device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells according to any one of claims 1 to 5, characterized in that, The coal sample pore pressure detection structure includes a pore pressure pump and a pressure sensor, with the pressure sensor installed inside the pores of the simulated coal sample.

8. The device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells according to any one of claims 1 to 5, characterized in that, It also includes a heater for raising the temperature inside the enclosure.

9. The device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells according to any one of claims 1 to 5, characterized in that, The pores of the simulated coal sample were filled with a proppant containing tracer particles.

10. The device for simulating the injection method of bio-enhancing fluid in low-yield coalbed methane wells according to any one of claims 1 to 5, characterized in that, A resistivity detector is installed inside the box.

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