Gas-liquid-solid separation and intelligent monitoring system and method for efficient coalbed methane development test

Abstract

The present application belongs to the technical field of coal seam mining simulation test, and particularly relates to a gas-liquid-solid separation and intelligent monitoring system and method for efficient coal seam gas development test, which comprises a test cavity, a low coal seam gas pressure coal seam and a high coal seam gas pressure coal seam are arranged in the test cavity; the low coal seam gas pressure coal seam and the high coal seam gas pressure coal seam are both communicated with an environment simulation module, the environment simulation module is used for generating a test specified gas pressure, temperature and stress; the gas outlet ends of the low coal seam gas pressure coal seam and the high coal seam gas pressure coal seam are both communicated with a three-phase fluid separation metering module; the gas inlet end of a negative pressure pump is communicated with the gas outlet ends of the two three-phase fluid separation metering modules; a backflow metering module for metering the amount of coal seam gas flowing back to the low coal seam gas pressure coal seam in the reverse direction is arranged between the three-phase fluid separation metering module communicated with the low coal seam gas pressure coal seam and the gas inlet end of the negative pressure pump; a data acquisition and intelligent control module is further included, and a use method of the above system is also included.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal seam mining simulation tests, and in particular relates to a gas-liquid-solid separation and intelligent monitoring system and method for efficient coal seam gas development tests. Background Art

[0002] Coalbed methane (CBM) development is crucial for ensuring safe and green coal mine production and optimizing the energy mix. With the depletion of shallow resources, coal mining development is shifting deeper. However, deep coal seams generally exhibit high stress, high karst water pressure, and low permeability, making CBM development increasingly difficult and severely restricting its efficient development. Therefore, this issue has become a key research topic in deep CBM development.

[0003] Indoor physical simulation tests are a common method for studying deep engineering challenges and provide an important tool for studying the efficient development of deep coalbed methane (CBM). However, during CBM development physical simulation tests, fluid migration is complex. Rather than simple single- or two-phase fluid migration, it involves three-phase transport: gas, liquid, and solid. These three-phase fluids interact, constrain, and influence each other, making quantitative analysis of CBM development results extremely difficult. Furthermore, the inability to achieve timely separation of the gas, liquid, and solid phases during simulation tests often reduces the accuracy of associated sensors or monitoring equipment, even causing damage to them. This reduces the success rate of tests and increases test costs and errors. Therefore, constructing equipment for the gas, liquid, and solid separation of CBM, water, and coal particles during CBM development, and proposing a quantitative monitoring method for the gas, liquid, and solid phases of CBM, water, and coal particles, has both theoretical and practical significance for studying the efficient development of CBM. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-efficiency gas-liquid-solid separation and intelligent monitoring system and method for coalbed methane development testing to solve the above problems.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] High-efficiency gas-liquid-solid separation and intelligent monitoring system for coalbed methane development trials, including:

[0007] A test cavity, wherein the middle portion of the test cavity is divided into a low-pressure coal seam at the upper portion and a high-pressure coal seam at the lower portion by a separation layer, wherein both the low-pressure coal seam and the high-pressure coal seam are filled with coal samples and produce a three-phase mixed fluid of coal seam gas, water, and coal particles;

[0008] The low coalbed methane pressure coal seam and the high coalbed methane pressure coal seam are both connected to an environmental simulation module, and the environmental simulation module is used to generate test-specified gas pressure, temperature and stress;

[0009] The gas outlets of the low-pressure coalbed methane coal seam and the high-pressure coalbed methane coal seam are both connected to a three-phase fluid separation and metering module, and the three-phase fluid separation and metering module is used to separate and meter the three-phase mixed fluid of coalbed methane, water and coal particles;

[0010] The air outlet ends of the two three-phase fluid separation and metering modules are connected to the air inlet end of the negative pressure pump;

[0011] A reflux metering module for measuring the amount of reverse-flowing coalbed methane returning to the low coalbed methane pressure coal seam is provided between the three-phase fluid separation metering module in communication with the low coalbed methane pressure coal seam and the air inlet end of the negative pressure pump;

[0012] The data acquisition and intelligent control module is electrically connected to the three-phase fluid separation and metering module and the environmental simulation module.

[0013] Optionally, the three-phase fluid separation and metering module includes:

[0014] a coalbed methane development pipe, wherein the gas inlet end of the coalbed methane development pipe is connected to the gas outlet end of the low coalbed methane pressure coal seam or the high coalbed methane pressure coal seam through a needle valve;

[0015] A particle separation section is provided in parallel in the middle of the coalbed methane development pipe. The coalbed methane-water-coal particle three-phase mixed fluid is processed by the particle separation section to form a coalbed methane-water two-phase mixed fluid. The separated coal particles are recovered and measured by the particle separation section.

[0016] a water separation unit, which is connected to the other end of the coalbed methane development pipe, wherein the coalbed methane-water two-phase mixed fluid is processed by the water separation unit to form a forward-flowing coalbed methane, and the separated water is recovered and measured by the water separation unit;

[0017] The coalbed methane metering unit is connected to the gas outlet end of the water separation unit and is used to measure the gas flow rate of the forward-flowing coalbed methane.

[0018] Optionally, the particle separation unit includes:

[0019] a high-pressure resistant metal screen fixedly connected to the middle of the coalbed methane development pipe, the high-pressure resistant metal screen being used to filter coal particles in the coalbed methane-water-coal particle three-phase mixed fluid;

[0020] The coal particle separation and collection equipment is connected to the middle part of the coalbed methane development pipe. The feed end of the coal particle separation and collection equipment is located on the side of the high-pressure resistant metal screen interception surface. The feed end of the coal particle separation and collection equipment is provided with a valve for controlling the opening and closing of the inlet.

[0021] Optionally, the water separation unit includes:

[0022] The tank body has a feed end connected to the outlet of the coalbed methane development pipe;

[0023] A high-pressure resistant baffle is fixedly connected to the tank body. The high-pressure resistant baffle divides the tank body into an air inlet chamber and a water collection chamber. A filter element is fixedly connected to the bottom of the high-pressure resistant baffle. The air inlet chamber is connected to the inlet of the filter element, and the outlet of the filter element is connected to the water collection chamber. The high-pressure resistant baffle is used to guide the coalbed methane-water two-phase mixed fluid to the filter element. The filter element is used to absorb moisture in the coalbed methane-water two-phase mixed fluid and move the moisture into the water collection chamber.

[0024] Optionally, the coalbed methane metering unit includes a one-way valve 1, a flow meter 1 and another one-way valve 1 that are connected in sequence;

[0025] The air inlet end of the first one-way valve is connected to the air outlet end of the water collection chamber, and the air outlet end of the second one-way valve is connected to the air inlet end of the negative pressure pump.

[0026] Optionally, the reflux metering module includes a second one-way valve, a second flow meter and another second one-way valve connected in sequence;

[0027] The air outlet end of the first one-way valve 2 is arranged in parallel on the air inlet end side of the corresponding one-way valve 1, and the air inlet end of the second one-way valve 2 is arranged in parallel on the air outlet end side of the corresponding one-way valve 1.

[0028] A method for using a high-efficiency gas-liquid-solid separation and intelligent monitoring system for coalbed methane development testing includes the following steps:

[0029] The processed coal seam samples are respectively filled into the low coal seam gas pressure coal seam and the high coal seam gas pressure coal seam, and the test specified pressure, temperature and stress are generated using the environmental simulation module; and the coal seam samples are waited for to reach an adsorption equilibrium state;

[0030] Starting the three-phase fluid separation and metering module and the negative pressure pump to separate and meter the coalbed methane-water-coal particle three-phase mixed fluid;

[0031] At the same time, the reflux metering module measures the amount of the reversely flowing coalbed methane.

[0032] Optionally, the coalbed methane adsorption equilibrium pressure of the high coalbed methane pressure coal seam reaches 2 MPa;

[0033] The coalbed methane adsorption equilibrium pressure of the low coalbed methane pressure coal seam reaches 1 MPa.

[0034] Optionally, the coal seam aeration adsorption time in the low coal seam methane pressure coal seam and the high coal seam methane pressure coal seam is 48 hours.

[0035] Compared with the prior art, the present invention has the following advantages and technical effects:

[0036] During use, the coal seam sample is processed and filled into a low coal seam gas pressure coal seam and a high coal seam gas pressure coal seam respectively, and the environmental simulation module is used to generate the specified test pressure, temperature and stress; wait for the coal seam sample to reach the adsorption equilibrium state; start the three-phase fluid separation and metering module and the negative pressure pump to separate and meter the coal seam gas-water-coal particle three-phase mixed fluid; at the same time, the reflux metering module measures the amount of coal seam gas flowing in the reverse direction. Through the above settings, the present application can highly restore the deep multi-thin coal seam occurrence environment and the entire process of coal seam gas development. The design of these parameters can highly simulate the occurrence environment of deep coal seams and the entire process of coal seam gas development, providing a reliable test platform for the scientific development of deep coal seam gas resources. The present invention realizes the efficient separation of gas-liquid-solid three-phase in the process of deep coal seam gas development, which not only improves the safety of the operating environment of sensors or monitoring equipment during the test, but also significantly improves the success rate of the test, helping to reduce environmental pollution. The present invention can accurately and quantitatively collect the separated gas-liquid-solid three-phase fluid, providing an innovative idea and method for quantitative analysis of coal seam gas development effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0038] Figure 1 It is a schematic diagram of the structure of the present invention;

[0039] Figure 2 This is a structural diagram of the connection between the three-phase fluid separation and metering module and the reflux metering module of the present invention;

[0040] Among them, 1. Test chamber; 2a. Low coalbed methane pressure coal seam; 2b. High coalbed methane pressure coal seam; 3. Coalbed methane development pipe; 4. High-pressure resistant metal screen; 5. Valve; 6. Coal particle separation and collection equipment; 7. Tank; 8. High-pressure resistant baffle; 9. Filter element; 10. Separated coal particles; 11. Separated water; 12. Coalbed methane-water-coal particle three-phase mixed fluid; 13. Coalbed methane-water two-phase mixed fluid; 14. Forward-flowing coalbed methane; 15a. One-way valve 1; 15b. One-way valve 2; 16a. Flowmeter 1; 16b. Flowmeter 2; 17. Reverse-flowing coalbed methane; 18. Separation layer; 19. Negative pressure pump; 20. Needle valve. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] Reference Figures 1 to 2 The present invention discloses a gas-liquid-solid separation and intelligent monitoring system for efficient coalbed methane development testing, comprising:

[0044] A test chamber 1, wherein the middle portion of the test chamber 1 is divided into a low-pressure coalbed methane coal seam 2a at the upper portion and a high-pressure coalbed methane coal seam 2b at the lower portion by a separation layer 18. The low-pressure coalbed methane coal seam 2a and the high-pressure coalbed methane coal seam 2b are both filled with coal samples and produce a three-phase mixed fluid 12 of coalbed methane, water, and coal particles.

[0045] The low-pressure coalbed methane coal seam 2a and the high-pressure coalbed methane coal seam 2b are both connected to an environmental simulation module, which is used to generate the test-specified gas pressure, temperature and stress;

[0046] The gas outlets of the low-pressure coalbed methane coal seam 2a and the high-pressure coalbed methane coal seam 2b are both connected to a three-phase fluid separation and metering module, which is used to separate and meter the three-phase mixed fluid 12 of coalbed methane, water and coal particles;

[0047] The air outlets of the two three-phase fluid separation and metering modules are connected to the air inlet of the negative pressure pump 19;

[0048] A reflux metering module for measuring the amount of reverse-flowing coalbed methane 17 flowing back toward the low-coalbed methane pressure coalbed 2a is provided between the three-phase fluid separation metering module in communication with the low-coalbed methane pressure coalbed 2a and the air inlet of the negative pressure pump 19;

[0049] The data acquisition and intelligent control module is electrically connected to the three-phase fluid separation and metering module and the environmental simulation module.

[0050] During use, the coal seam samples are processed and filled into the low coal seam methane pressure coal seam 2a and the high coal seam methane pressure coal seam 2b respectively, and the environmental simulation module is used to generate the test specified air pressure, temperature and stress; wait for the coal seam samples to reach the adsorption equilibrium state; start the three-phase fluid separation and metering module and the negative pressure pump 19 to separate and meter the coal seam methane-water-coal particle three-phase mixed fluid 12; at the same time, the reflux metering module measures the amount of coal seam methane 17 flowing in the reverse direction. Through the above-mentioned settings, the present application can highly restore the occurrence environment of deep multiple thin coal seams and the entire process of coalbed methane development. The design of these parameters can highly simulate the occurrence environment of deep coal seams and the entire process of coalbed methane development, providing a reliable experimental platform for the scientific development of deep coalbed methane resources. The present invention realizes the efficient separation of gas-liquid-solid three-phases during deep coalbed methane development, which not only improves the safety of the operating environment of sensors or monitoring equipment during the test, but also significantly improves the success rate of the test, and helps to reduce environmental pollution. The present invention can accurately and quantitatively collect the separated gas-liquid-solid three-phase fluid, providing innovative ideas and methods for quantitative analysis of coalbed methane development effects.

[0051] The present invention consists of a test chamber 1, an environment simulation module, a data acquisition and intelligent control module, a three-phase fluid separation and metering module, and a negative pressure pump 19.

[0052] The environmental simulation module consists of a stress loading module, an inflation adsorption module and a ground temperature control module.

[0053] Test chamber 1 is made of a thermally insulating, high-pressure-resistant, and environmentally friendly metal material. Its maximum sealing pressure can reach 3 MPa, while also isolating the internal temperature of the test chamber from the ambient temperature for heat exchange. The stress loading module can provide a maximum ground stress loading of 12 MPa. The ground stress loading can be applied in stages and steps by programming the stress loading program in the data acquisition and intelligent control module. The aeration adsorption module can provide the coalbed methane required for the experiment. The aeration adsorption program can be programmed in the data acquisition and intelligent control module to achieve step-by-step and staged aeration of the coalbed methane, while also precisely controlling the adsorption volume and pressure. The geothermal control module can accurately simulate the temperature field of the coalbed methane reservoir at different burial depths. Similarly, the geothermal control program can be programmed in the data acquisition and intelligent control module to achieve step-by-step heating of the ground temperature, precisely simulating the temperature of the formations at different depths. The data acquisition and intelligent control module can collect comprehensive data from test chamber 1 and data from other modules, and also provides a self-programming program interface for intelligent and precise control of other modules. The three-phase fluid separation and metering module is mainly used to realize the separation and quantitative monitoring of coalbed methane-water-coal particles in the process of simulating coalbed methane development by the negative pressure pump 19.

[0054] The separation layer 18 is made of a material similar to the key layer, which has high strength and good sealing performance, and can effectively prevent the coalbed methane in the high coalbed methane pressure coal seam 2b from leaking to the low coalbed methane pressure coal seam 2a;

[0055] Similar materials are mainly composed of yellow mud, latex glue, gypsum and water.

[0056] The negative pressure pump 19 adopts an energy-saving negative pressure pump to reduce energy consumption and improve the extraction efficiency of coalbed methane.

[0057] As an optional embodiment, the three-phase fluid separation metering module includes:

[0058] A coalbed methane development pipe 3, the gas inlet end of the coalbed methane development pipe 3 is connected to the gas outlet end of the low coalbed methane pressure coal seam 2a or the high coalbed methane pressure coal seam 2b through a needle valve 20;

[0059] The particle separation section is arranged in parallel in the middle of the coalbed methane development pipe 3. The coalbed methane-water-coal particle three-phase mixed fluid 12 is processed by the particle separation section to form a coalbed methane-water two-phase mixed fluid 13. The separated coal particles 10 are recovered and measured by the particle separation section.

[0060] The water separation unit is connected to the other end of the coalbed methane development pipe 3. The coalbed methane-water two-phase mixed fluid 13 is processed by the water separation unit to form a forward-flowing coalbed methane 14. The separated water 11 is recovered and measured by the water separation unit.

[0061] The coalbed methane metering unit is connected to the gas outlet of the water separation unit and is used to measure the gas flow rate of the coalbed methane 14 flowing in the forward direction.

[0062] As an optional embodiment, the particle separation unit includes:

[0063] The high-pressure resistant metal screen 4 is fixedly connected to the middle of the coalbed methane development pipe 3 and is used to filter the coal particles in the coalbed methane-water-coal particle three-phase mixed fluid 12;

[0064] The coal particle separation and collection equipment 6 is connected to the middle of the coalbed methane development pipe 3. The feed end of the coal particle separation and collection equipment 6 is located on the side of the interception surface of the high-pressure resistant metal screen 4. The feed end of the coal particle separation and collection equipment 6 is provided with a valve 5 for controlling the opening and closing of the inlet.

[0065] The high-pressure resistant metal screen 4 is made of environmentally friendly materials and has high strength and corrosion resistance.

[0066] The coal particle separation and collection equipment 6 adopts precise measurement technology to ensure the accurate separation and quantitative collection of coal particles.

[0067] The coal particle separation and collection equipment 6 can weigh the collected coal particles.

[0068] As an optional embodiment, the water separation unit includes:

[0069] The feed end of the tank body 7 is connected to the outlet of the coalbed methane development pipe 3;

[0070] The high-pressure resistant baffle 8 is fixedly connected to the tank body 7. The high-pressure resistant baffle 8 divides the tank body 7 into an air inlet chamber and a water collection chamber. A filter element 9 is fixedly connected to the bottom of the high-pressure resistant baffle 8. The air inlet chamber is connected to the inlet of the filter element 9, and the outlet of the filter element 9 is connected to the water collection chamber. The high-pressure resistant baffle 8 is used to guide the coalbed methane-water two-phase mixed fluid 13 to the filter element 9. The filter element 9 is used to absorb moisture in the coalbed methane-water two-phase mixed fluid 13 and move the moisture to the water collection chamber.

[0071] As an optional embodiment, the coalbed methane metering unit includes a one-way valve 15a, a flow meter 16a and another one-way valve 15a which are connected in sequence;

[0072] The air inlet end of the front one-way valve 15a is connected to the air outlet end of the water collection chamber, and the air outlet end of the rear one-way valve 15a is connected to the air inlet end of the negative pressure pump 19.

[0073] As an optional embodiment, the reflux metering module includes a second one-way valve 15b, a second flow meter 16b and another second one-way valve 15b which are connected in sequence;

[0074] The outlet end of the first one-way valve 15b is arranged in parallel on the side of the inlet end of the corresponding one-way valve 15a, and the inlet end of the second one-way valve 15b is arranged in parallel on the side of the outlet end of the corresponding one-way valve 15a.

[0075] A method for using a high-efficiency gas-liquid-solid separation and intelligent monitoring system for coalbed methane development testing includes the following steps:

[0076] After the coal seam samples are processed, they are respectively filled into the low coal seam gas pressure coal seam 2a and the high coal seam gas pressure coal seam 2b, and the environmental simulation module is used to generate the test specified pressure, temperature and stress; and the coal seam samples are waited for to reach the adsorption equilibrium state;

[0077] Start the three-phase fluid separation and metering module and the negative pressure pump 19 to separate and meter the coalbed methane-water-coal particle three-phase mixed fluid 12;

[0078] At the same time, the reflux metering module measures the amount of the coalbed methane 17 flowing in the reverse direction.

[0079] As an optional embodiment, the coalbed methane adsorption equilibrium pressure of the high coalbed methane pressure coal seam 2b reaches 2 MPa;

[0080] The coalbed methane adsorption equilibrium pressure of the low coalbed methane pressure coal seam 2a reaches 1Mpa.

[0081] As an optional implementation manner, the coal seam aeration adsorption time in the low coal seam methane pressure coal seam 2a and the high coal seam methane pressure coal seam 2b is 48 hours.

[0082] The relationship between the process steps and actions of the present invention:

[0083] Step 1: Test preparation and efficient aeration adsorption:

[0084] (1) Sample processing and loading: Coal samples collected from deep coal mines are finely cut and precisely ground to predetermined specifications and then loaded into the test chamber 1.

[0085] (2) Coal seam simulation and isolation: First, the treated coal sample is placed in the test cavity 1, and a high coal seam gas pressure environment is simulated in the high coal seam gas pressure coal seam 2b, and a separation layer 18 is laid above the high coal seam gas pressure coal seam 2b.

[0086] (3) Low-pressure coal seam filling and balance: Deep coal samples of the same specifications are loaded into the low-pressure coal seam 2a to form a comparative test environment. At the same time, the two coal seams are aerated and adsorbed to ensure that the adsorption equilibrium pressure of the coal seam methane in the high-pressure coal seam methane coal seam 2b reaches 2MPa, while the adsorption equilibrium pressure in the low-pressure coal seam methane coal seam 2a is 1MPa.

[0087] (4) Adsorption equilibrium and development preparation: The two coal seams were aerated and adsorbed using the aeration adsorption control module. After 48 hours of aeration, adsorption equilibrium was reached. During this process, an energy-saving adsorption equilibrium control system was used to reduce energy consumption and improve test accuracy. After adsorption equilibrium was reached, the data acquisition and intelligent control module was instantly activated and automatically opened the needle valve 20 to perform coalbed methane development operations. The preparation stage took into account environmental protection and intelligent control of the entire test process.

[0088] Step 2: Separation and quantitative collection of coal particles:

[0089] (1) Starting the negative pressure development system: In step 1, the data acquisition and intelligent control module is instantly started and the needle valve 20 is automatically opened. At the same time, the negative pressure pump 19 is started to implement the negative pressure development of coalbed methane.

[0090] (2) Fluid guidance and separation: With the opening of the needle valve 20 and the energy-saving negative pressure pump 19, the coalbed methane-water-coal particle three-phase mixed fluid 12 flows along the coalbed methane development pipe 3. The fluid first passes through the high-pressure resistant metal screen 4, and the high-pressure resistant metal screen 4 effectively separates the coal particles.

[0091] (3) When the data acquisition and intelligent control module automatically recognizes that the coalbed methane pressure is close to the depletion pressure, it will automatically save the data and end the test. At the same time, the valve 5 will automatically pop open, allowing the coal particles intercepted by the high-pressure resistant metal screen 4 to fall into the coal particle separation and collection equipment 6 with measurement function.

[0092] Step 3: Separation and accurate quantitative collection of water:

[0093] (1) Fluid guidance: The coalbed methane-water two-phase mixed fluid 13 continues to flow along the coalbed methane development pipe until it reaches the tank body 7. A high-pressure resistant baffle 8 is provided inside the tank body 7, which can guide the fluid to flow toward the filter element 9.

[0094] (2) Separation and filtration: The filter element 9 uses high-efficiency filter materials, which can effectively separate the water in the mixed fluid while allowing the coalbed methane single-phase fluid to pass through.

[0095] (3) Water collection and quantification: The filtered water is collected in the tank 7, which is equipped with a high-precision measurement system that can accurately measure the quality of the collected water.

[0096] Step 4: Separation and precise quantitative collection of forward and reverse flow coalbed methane:

[0097] (1) Forward CBM flow acquisition: CBM gas continues to flow along the CBM development pipe and passes through a one-way valve 15a to ensure one-way flow. Flow meter 16a uses high-precision measurement technology to quantitatively acquire forward CBM flow in real time, providing accurate data for the effective development of CBM resources.

[0098] (2) Reverse coalbed methane flow acquisition: Due to the pressure difference between the two coal seams, some high-pressure coalbed methane forms reverse-flow coalbed methane 17. The reverse-flowing coalbed methane 17 passes through a specially designed one-way valve 15b and a flowmeter 16b. The flowmeter 16b also uses high-precision measurement technology to complete the quantitative real-time acquisition of the reverse coalbed methane flow.

[0099] Through the above four carefully designed steps, the present invention realizes efficient gas-liquid-solid separation and precise quantitative monitoring in deep coalbed methane development experiments, providing technical support for the green and efficient development of deep coalbed methane resources.

[0100] Compared with the prior art, the present invention has the following advantages:

[0101] (1) Highly Simulated Environment: The present invention provides a maximum geostress loading value of 12 MPa, a maximum coalbed methane adsorption pressure of 3 MPa, a simulated coalbed temperature of 50°C, and a maximum sealing pressure between coalbeds of 1 MPa. This allows for a highly realistic simulation of the deep, multi-thin coalbed environment and the entire coalbed methane development process. These parameters are designed to closely simulate the deep coalbed environment and the entire coalbed methane development process, providing a reliable experimental platform for the scientific development of deep coalbed methane resources.

[0102] (2) Safe and efficient separation technology: This invention achieves efficient gas-liquid-solid separation during deep coalbed methane development. This not only improves the safety of the operating environment of sensors or monitoring equipment during the test, but also significantly increases the success rate of the test and reduces the test cost. In addition, the application of this technology helps reduce environmental pollution and is in line with the development concept of green environmental protection.

[0103] (3) Quantitative Collection and Analysis: This invention enables precise quantitative collection of separated gas-liquid-solid three-phase fluids, providing innovative ideas and methods for quantitatively analyzing the effects of coalbed methane development. This technology has important theoretical and practical engineering significance for optimizing coalbed methane development processes and improving resource utilization efficiency.

[0104] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0105] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. High-efficiency gas-liquid-solid separation and intelligent monitoring system for coalbed methane development test, characterized by: include: A test cavity (1), wherein the middle portion of the test cavity (1) is divided into a low coalbed methane pressure coal seam (2a) located at an upper portion and a high coalbed methane pressure coal seam (2b) located at a lower portion by a separation layer (18), wherein both the low coalbed methane pressure coal seam (2a) and the high coalbed methane pressure coal seam (2b) are filled with coal samples and generate a coalbed methane-water-coal particle three-phase mixed fluid (12); The low coalbed methane pressure coal seam (2a) and the high coalbed methane pressure coal seam (2b) are both connected to an environmental simulation module, and the environmental simulation module is used to generate test-specified gas pressure, temperature and stress; The gas outlet ends of the low coalbed methane pressure coal seam (2a) and the high coalbed methane pressure coal seam (2b) are both connected to a three-phase fluid separation and metering module, and the three-phase fluid separation and metering module is used to separate and meter the coalbed methane-water-coal particle three-phase mixed fluid (12); The air outlet ends of the two three-phase fluid separation and metering modules are connected to the air inlet end of a negative pressure pump (19); A reflux metering module for metering the amount of reverse-flowing coalbed methane (17) flowing back toward the low coalbed methane pressure coalbed (2a) is provided between the three-phase fluid separation metering module in communication with the low coalbed methane pressure coalbed (2a) and the air inlet of the negative pressure pump (19); The data acquisition and intelligent control module is electrically connected to the three-phase fluid separation and metering module and the environmental simulation module.

2. The high-efficiency gas-liquid-solid separation and intelligent monitoring system for coalbed methane development testing according to claim 1 is characterized in that: The three-phase fluid separation and metering module includes: A coalbed methane development pipe (3), wherein the gas inlet end of the coalbed methane development pipe (3) is connected to the gas outlet end of the low coalbed methane pressure coal seam (2a) or the high coalbed methane pressure coal seam (2b) through a needle valve (20); A particle separation section is provided in parallel in the middle of the coalbed methane development pipe (3); the coalbed methane-water-coal particle three-phase mixed fluid (12) is processed by the particle separation section to form a coalbed methane-water two-phase mixed fluid (13); the separated coal particles (10) are recovered and measured by the particle separation section; A water separation section is connected to the other end of the coalbed methane development pipe (3), wherein the coalbed methane-water two-phase mixed fluid (13) is processed by the water separation section to form a forward-flowing coalbed methane (14), and the separated water (11) is recovered and measured by the water separation section; A coalbed methane metering unit is connected to the gas outlet end of the water separation unit and is used to measure the gas flow rate of the forward-flowing coalbed methane (14).

3. The high-efficiency gas-liquid-solid separation and intelligent monitoring system for coalbed methane development testing according to claim 2 is characterized in that: The particle separation unit includes: a high-pressure resistant metal screen (4) fixedly connected to the middle of the coalbed methane development pipe (3), the high-pressure resistant metal screen (4) being used to filter coal particles in the coalbed methane-water-coal particle three-phase mixed fluid (12); The coal particle separation and collection equipment (6) is connected to the middle of the coalbed methane development pipe (3), and the feed end of the coal particle separation and collection equipment (6) is located on the side of the interception surface of the high-pressure resistant metal screen (4). The feed end of the coal particle separation and collection equipment (6) is provided with a valve (5) for controlling the opening and closing of the inlet.

4. The high-efficiency gas-liquid-solid separation and intelligent monitoring system for coalbed methane development testing according to claim 2 is characterized in that: The water separation unit includes: The tank body (7) has a feed end connected to the outlet of the coalbed methane development pipe (3); A high-pressure resistant baffle (8) is fixedly connected in the tank body (7). The high-pressure resistant baffle (8) divides the tank body (7) into an air inlet chamber and a water collection chamber. A filter element (9) is fixedly connected to the bottom of the high-pressure resistant baffle (8). The air inlet chamber is communicated with the inlet of the filter element (9), and the outlet of the filter element (9) is communicated with the water collection chamber. The high-pressure resistant baffle (8) is used to guide the coalbed methane-water two-phase mixed fluid (13) to the filter element (9). The filter element (9) is used to absorb moisture in the coalbed methane-water two-phase mixed fluid (13) and move the moisture into the water collection chamber.

5. The high-efficiency gas-liquid-solid separation and intelligent monitoring system for coalbed methane development testing according to claim 4 is characterized in that: The coalbed methane metering unit comprises a one-way valve (15a), a flow meter (16a) and another one-way valve (15a) which are connected in sequence; The air inlet end of the first one-way valve (15a) is connected to the air outlet end of the water collection chamber, and the air outlet end of the second one-way valve (15a) is connected to the air inlet end of the negative pressure pump (19).

6. The high-efficiency gas-liquid-solid separation and intelligent monitoring system for coalbed methane development testing according to claim 5 is characterized by: The reflux metering module comprises a second one-way valve (15b), a second flow meter (16b) and another second one-way valve (15b) which are connected in sequence; The outlet end of the first one-way valve 2 (15b) is arranged in parallel on the side of the inlet end of the corresponding one-way valve 1 (15a), and the inlet end of the second one-way valve 2 (15b) is arranged in parallel on the side of the outlet end of the corresponding one-way valve 1 (15a).

7. A method for using a high-efficiency gas-liquid-solid separation and intelligent monitoring system for coalbed methane development testing, using the high-efficiency gas-liquid-solid separation and intelligent monitoring system for coalbed methane development testing according to any one of claims 1 to 6, characterized in that: The steps include: After processing, the coal seam samples are respectively filled into the low coal seam gas pressure coal seam (2a) and the high coal seam gas pressure coal seam (2b), and the environmental simulation module is used to generate the test specified pressure, temperature and stress; and the coal seam samples are waited for to reach an adsorption equilibrium state; Starting the three-phase fluid separation and metering module and the negative pressure pump (19) to separate and meter the coalbed methane-water-coal particle three-phase mixed fluid (12); At the same time, the reflux metering module measures the amount of the reversely flowing coalbed methane (17).

8. The method for using the high-efficiency gas-liquid-solid separation and intelligent monitoring system for coalbed methane development testing according to claim 7 is characterized by: The coalbed methane adsorption equilibrium pressure of the high coalbed methane pressure coal seam (2b) reaches 2 MPa; The coalbed methane adsorption equilibrium pressure of the low coalbed methane pressure coal seam (2a) reaches 1 MPa.

9. The method for using the high-efficiency gas-liquid-solid separation and intelligent monitoring system for coalbed methane development testing according to claim 7, characterized in that: The coal seam aeration adsorption time in the low coal seam gas pressure coal seam (2a) and the high coal seam gas pressure coal seam (2b) is 48 hours.

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