Gas-liquid-solid separation and intelligent monitoring system and method for efficient coal bed gas development test

Abstract

The invention belongs to the technical field of coal seam mining simulation tests, and particularly relates to a gas-liquid-solid separation and intelligent monitoring system and method for a high-efficiency coal seam gas development test, and the system comprises a test cavity which is internally provided with a low coal seam gas pressure coal seam and a high coal seam gas pressure coal seam; the low-coal-bed-gas pressure coal seam and the high-coal-bed-gas pressure coal seam are both communicated with an environment simulation module, and the environment simulation module is used for generating test specified air pressure, temperature and stress; the gas outlet ends of the low coal bed gas pressure coal seam and the high coal bed gas pressure coal seam are respectively communicated with a three-phase fluid separation metering module; the air outlet ends of the two three-phase fluid separation metering modules are communicated with the air inlet end of a negative pressure pump; a backflow metering module used for metering the number of coal bed gas flowing reversely and flowing back to the low coal bed gas pressure coal bed is arranged between the three-phase fluid separation metering module communicated with the low coal bed gas pressure coal bed and the gas inlet end of the negative pressure pump. The invention further discloses a using method of the system.

Description

Technical Field

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

[0002] Coalbed methane development is the key to ensuring safe and green production of coal mines and optimizing the energy structure. With the depletion of shallow resources, coal mine development has begun to move to deeper areas. However, deep coal seams generally have the characteristics of high stress, high karst water pressure and low permeability, which makes coalbed methane development more difficult and seriously restricts the efficient development of coalbed methane. Therefore, this issue has become an important research direction in the field of deep coalbed methane development.

[0003] Indoor physical simulation test is a common method for studying deep engineering problems, and provides an important means for studying the efficient development of deep coalbed methane. However, in the process of indoor physical simulation test of coalbed methane development, fluid migration is complex. It is not a simple single-phase or two-phase fluid migration, but a gas-liquid-solid three-phase migration including coalbed methane-water-coal particles. The three-phase fluid will interact, restrict and influence each other, which brings great difficulties to the quantitative analysis of coalbed methane development effect. In addition, in the simulation test process, the inability to separate the gas-liquid-solid three-phase fluid in time often leads to the reduction of the accuracy of related sensors or monitoring equipment, or even damage to sensors and monitoring equipment, which reduces the success rate of the test and increases the test cost and test error. Therefore, constructing the gas-liquid-solid three-phase separation equipment of coalbed methane-water-coal particles in the process of coalbed methane development, and proposing the gas-liquid-solid three-phase quantitative monitoring method of coalbed methane-water-coal particles, has certain theoretical and engineering practical significance for studying the efficient development of coalbed methane. Summary of the invention

[0004] The purpose of the present invention is to provide a gas-liquid-solid separation and intelligent monitoring system and method for efficient 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 test, including:

[0007] A test cavity, wherein the middle part of the test cavity is divided into a low coalbed methane pressure coal seam located at an upper part and a high coalbed methane pressure coal seam located at a lower part by a partition layer, and the low coalbed methane pressure coal seam and the high coalbed methane pressure coal seam are both filled with coal samples and produce a three-phase mixed fluid of coalbed methane-water-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 a test specified air pressure, temperature and stress;

[0009] The gas outlet ends of the low coalbed methane pressure coal seam and the high coalbed methane pressure coal seam are both connected with a three-phase fluid separation and metering module, and the three-phase fluid separation and metering module is used for separating and metering the three-phase mixed fluid of coalbed methane-water-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 metering the amount of reversely flowing coalbed methane returning to the low coalbed methane pressure coalbed is provided between the three-phase fluid separation metering module connected to the low coalbed methane pressure coalbed 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 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 arranged 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, and the separated coal particles are recovered and measured by the particle separation section;

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

[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 is fixedly connected to the middle of the coalbed methane development pipe, and the high-pressure resistant metal screen is used to filter the 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 one 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 comprises:

[0022] A tank body, the feed end of which is connected to the outlet of the coalbed methane development pipe;

[0023] A high-pressure resistant baffle is fixedly connected in the tank body, and 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, and 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, and the filter element is used to absorb moisture in the coalbed methane-water two-phase mixed fluid and move the moisture to 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 which 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 which are connected in sequence;

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

[0028] The method for using the gas-liquid-solid separation and intelligent monitoring system for efficient coalbed methane development test includes the following steps:

[0029] The coal seam samples are processed and respectively filled into the low coal seam gas pressure coal seam and the high coal seam gas pressure coal seam, and the environmental simulation module is used to generate the test specified air pressure, temperature and stress; 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 meters 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] When in use, the coal seam sample is processed and filled into the low coal seam gas pressure coal seam and the high coal seam gas pressure coal seam respectively, and the environmental simulation module is used to generate the specified air pressure, temperature and stress of the test; wait for the coal seam sample to reach the adsorption equilibrium state; start the three-phase fluid separation 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 storage environment and the whole process of coal seam gas development. The design of these parameters can highly simulate the storage environment of deep coal seams and the whole 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, which 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 quantitatively analyzing the effect of coal seam gas development. 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 drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

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

[0039] Figure 2 This is a connection structure diagram of the three-phase fluid separation 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 body; 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 one; 15b. one-way valve two; 16a. flowmeter one; 16b. flowmeter two; 17. reverse-flowing coalbed methane; 18. separation layer; 19. negative pressure pump; 20. needle valve. DETAILED DESCRIPTION

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

[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 Figure 1 to Figure 2 The present invention discloses a gas-liquid-solid separation and intelligent monitoring system for efficient coalbed methane development test, comprising:

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

[0045] 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 the test specified air pressure, temperature and stress;

[0046] The gas outlets 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, which is used to separate and meter the three-phase mixed fluid 12 of coalbed methane-water-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 metering the amount of reverse-flowing coalbed methane 17 refluxed toward the low coalbed methane pressure coalbed 2a is provided between the three-phase fluid separation metering module connected to the low coalbed methane pressure coalbed 2a and the air inlet end 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] When in 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 specified air pressure, temperature and stress for the test; 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 storage environment of deep multiple thin coal seams and the entire process of coalbed methane development. The design of these parameters can highly simulate the storage 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 in the process of deep coalbed methane development, which not only improves the safety of the operating environment of sensors or monitoring equipment during the experiment, but also significantly improves the success rate of the experiment, 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 is composed 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] The test chamber 1 is made of a heat-insulating, high-pressure-resistant, green and environmentally friendly metal material. The maximum sealing pressure can reach 3MPa. At the same time, it can also isolate the internal temperature of the test box from the ambient temperature for heat exchange. The stress loading module can provide a maximum ground stress loading of 12MPa, and the ground stress can be loaded in steps and stages by self-programming the stress loading program in the data acquisition and intelligent control module. The inflation adsorption module can provide the coalbed methane required for the experiment, and the coalbed methane can be inflated in steps and stages by self-programming the inflation adsorption program in the data acquisition and intelligent control module, and the adsorption amount and adsorption pressure can be accurately controlled. The geothermal control module can accurately simulate the temperature field of the coalbed methane reservoir under different burial depths. It can also realize the step-by-step heating of the ground temperature through the self-programming geothermal control program in the data acquisition and intelligent control module, and can accurately simulate the temperature of the underground formations at different burial depths. The data acquisition and intelligent control module can realize the data acquisition of the test chamber 1 in all directions and other modules, and can also provide a self-programming program interface to realize intelligent and accurate 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 coalbed methane development simulated 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 implementation, 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 part 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 part to form a coalbed methane-water two-phase mixed fluid 13. The separated coal particles 10 are recovered and measured by the particle separation part.

[0060] The water separation part 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 part to form a forward-flowing coalbed methane 14, and the separated water 11 is recovered and measured by the water separation part;

[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 the high-pressure resistant metal screen 4 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 part 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] 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 connected to the inlet of the filter element 9. 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 implementation, 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 one-way valve 15b, a flow meter 16b and another one-way valve 15b which are connected in sequence;

[0074] The outlet end of the first one-way valve 15b is arranged in parallel with 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 with the outlet end of the corresponding one-way valve 15a.

[0075] The method for using the gas-liquid-solid separation and intelligent monitoring system for efficient coalbed methane development test includes the following steps:

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

[0077] The three-phase fluid separation and metering module and the negative pressure pump 19 are started 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 implementation, the coalbed methane adsorption equilibrium pressure of the high coalbed methane pressure coal seam 2b reaches 2Mpa;

[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 process steps and action relationships of the present invention are as follows:

[0083] Step 1: Test preparation and efficient gas 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 chamber 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 coalbed methane pressure coal seam 2a to form a comparative test environment. At the same time, the two coal seams are inflated and adsorbed simultaneously to ensure that the coalbed methane adsorption equilibrium pressure in the high coalbed methane pressure coal seam 2b reaches 2MPa, while the adsorption equilibrium pressure in the low coalbed methane pressure coal seam 2a is 1MPa.

[0087] (4) Adsorption balance and development preparation: The two coal seams were aerated and adsorbed by the aeration adsorption control module. After 48 hours of aeration adsorption, the adsorption equilibrium state was reached. In this process, an energy-saving adsorption balance control system was used to reduce energy consumption and improve the accuracy of the test. After the adsorption balance was reached, the data acquisition and intelligent control module was instantly started and the needle valve 20 was automatically opened to perform the development operation of the coalbed methane. The preparation stage took into account the 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, when the data acquisition and intelligent control module is instantly started and the needle valve 20 is automatically opened, the negative pressure pump 19 is simultaneously 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 coal particles are effectively separated by the high-pressure resistant metal screen 4.

[0091] (3) When the data acquisition and intelligent control module automatically recognizes that the coalbed methane pressure is close to the exhaustion pressure, it will automatically save the data and end the test. At the same time, it will automatically pop open the valve 5, so that the coal particles intercepted by the high-pressure resistant metal screen 4 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 filtration 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 coalbed methane flow collection: The coalbed methane gas continues to flow along the coalbed methane development pipe and passes through the one-way valve 15a to ensure the one-way passage of the fluid. The flow meter 16a adopts high-precision measurement technology and can quantitatively collect the forward coalbed methane flow in real time, providing accurate data for the effective development of coalbed methane resources.

[0098] (2) Reverse coalbed methane flow collection: Due to the pressure difference between the two coal seams, part of the 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 collection of the reverse coalbed methane flow.

[0099] Through the above four carefully designed steps, the present invention realizes efficient gas-liquid-solid separation and accurate 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 maximum geostress loading value provided by the present invention reaches 12MPa, the maximum coalbed methane adsorption pressure can reach 3MPa, the simulated coal seam temperature can reach 50°C, and the maximum sealing pressure between coal seams can reach 1MPa, which can highly restore the deep multi-thin coal seam storage environment and the entire process of coalbed methane development. The design of these parameters can highly simulate the storage environment of deep coal seams and the entire process of coalbed methane development, providing a reliable test platform for the scientific development of deep coalbed methane resources.

[0102] (2) Safe and efficient separation technology: The present invention realizes efficient separation of gas-liquid-solid three phases in the process of 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 reduces the test cost. In addition, the application of this technology helps to reduce environmental pollution and is in line with the development concept of green environmental protection.

[0103] (3) Quantitative collection and analysis: The present invention can accurately and quantitatively collect the separated gas-liquid-solid three-phase fluid, providing an innovative idea and method for quantitatively analyzing the effect of coalbed methane development. This technology has important theoretical and engineering practical significance for optimizing coalbed methane development technology and improving resource utilization efficiency.

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

[0105] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined 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 the low coalbed methane pressure coal seam (2a) and the high coalbed methane pressure coal seam (2b) are both filled with coal samples and produce 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 a test specified air 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 reversely flowing coalbed methane (17) refluxed toward the low coalbed methane pressure coalbed (2a) is provided between the three-phase fluid separation metering module connected to the low coalbed methane pressure coalbed (2a) and the air inlet end 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 test according to claim 1 is characterized in that: The three-phase fluid separation metering module comprises: 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 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; A water separation section 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 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 test according to claim 2 is characterized in that: The particle separation unit comprises: A high-pressure resistant metal screen (4) is fixedly connected to the middle of the coalbed methane development pipe (3), and the high-pressure resistant metal screen (4) is 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 part 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 test according to claim 2 is characterized in that: The water separation unit comprises: A tank body (7), the feed end of which is in communication with 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 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.

5. The high-efficiency gas-liquid-solid separation and intelligent monitoring system for coalbed methane development test 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 one-way valve 2 (15b), a flow meter 2 (16b) and another one-way valve 2 (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 (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: The coal seam samples are processed and 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 air 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 meters 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 test according to claim 7 is characterized by: The coalbed methane adsorption equilibrium pressure of the high coalbed methane pressure coal seam (2b) reaches 2Mpa; 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 test 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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