CO2 displacement coalbed methane simulation experiment device
By designing a CO2 displacement simulation experimental device with multiple coal sample tubes connected in parallel, the problem that existing devices cannot simultaneously reflect different temperature and pressure conditions was solved, realizing efficient observation of CO2 displacement effect under temperature and pressure conditions, and improving experimental efficiency and accuracy.
Patent Information
- Application Number
- CN202520173963.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-26
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2035-01-26
AI Technical Summary
Existing experimental devices for simulating CO2 injection to displace coalbed methane production cannot simultaneously reflect the displacement effect under different temperature and pressure conditions, resulting in poor experimental efficiency and effectiveness.
Design a CO2 displacement coalbed methane simulation experimental device, which includes a high-pressure carbon dioxide cylinder and a methane cylinder. Multiple coal sample tubes are connected in parallel, and each coal sample tube is equipped with a heating sleeve and a booster pump to realize simulation experiments under different temperature and pressure conditions. Temperature and pressure sensors are used for automated control.
This study enabled the observation of CO2 displacement effects under different temperature and pressure conditions within the same timeframe, improving experimental efficiency and accuracy and providing a reference for improving coalbed methane production efficiency.
Smart Images
Figure CN223806133U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to coal bed gas development and utilization technical field, concretely is a CO2 displacement coal bed gas simulation experiment device. BACKGROUND
[0002] The coal bed of our country has the characteristics of low coal bed gas original pressure, low coal bed permeability and high coal rock metamorphic degree, which greatly influences the development efficiency of the coal bed gas of our country. The CO2 displacement stimulation coal bed gas technology (ECBM) can effectively increase the output rate of the coal bed gas, can also effectively reduce carbon emission and has the double effects of economy and environmental protection.
[0003] The simulation CO2 displacement stimulation coal bed gas experiment device in the prior art is mostly a single reaction device and cannot simultaneously react the displacement effects under different temperature and pressure environments. Therefore, the CO2 displacement coal bed gas simulation experiment device is provided. UTILITY MODEL CONTENT
[0004] The utility model solves the technical problem of overcoming the defects of the prior art and provides a CO2 displacement coal bed gas simulation experiment device. CO2 can enter each coal placement device at the same time to start displacement experiment, and then the CO2 displacement effects under different temperature and pressure conditions can be observed at the same time. The simulation is more comprehensive, the experiment efficiency and experiment effect are improved, and the problems in the background art can be effectively solved.
[0005] To achieve the above object, the utility model provides the following technical scheme: a CO2 displacement coal bed gas simulation experiment device, comprising a carbon dioxide high-pressure cylinder and a methane cylinder, a gas outlet of the carbon dioxide high-pressure cylinder is provided with a gas outlet pipe, the gas outlet pipe is connected in parallel with one end of a plurality of branch pipes, a gas inlet of the methane cylinder is provided with a gas inlet pipe, the other end of the plurality of branch pipes is connected in parallel with the gas inlet pipe, a coal sample placement pipe is installed on each branch pipe, the branch pipe and the coal sample placement pipe are connected internally, a heating sleeve is sleeved outside the coal sample placement pipe, a booster pump is installed on the heating sleeve, and the gas outlet end of the booster pump passes through the heating sleeve and is connected with the inside of the coal sample placement pipe.
[0006] As a preferred technical scheme of the utility model, the gas inlet valve and the gas outlet valve are respectively installed on the two sides of the coal sample placement pipe.
[0007] As a preferred technical scheme of the utility model, the heating sleeve is hollow and filled with a heating liquid, and a plurality of heaters are uniformly arranged in the radial direction of the heating sleeve.
[0008] As a preferred technical scheme of the utility model, the side surface of the heating sleeve is provided with a liquid replacement opening, and a sealing cover is arranged on the liquid replacement opening.
[0009] As a preferred technical scheme of the utility model, temperature sensor is arranged on the coal sample placing pipe, and the detection end of the temperature sensor is arranged inside the coal sample placing pipe.
[0010] As a preferred technical scheme of the utility model, pressure sensor is arranged on the coal sample placing pipe, and the detection end of the pressure sensor is arranged inside the coal sample placing pipe.
[0011] As a preferred technical scheme of the utility model, absorption device for absorbing residual carbon dioxide is installed on the branch pipe near the methane gas cylinder, the absorption device includes a cylinder body, the branch pipe includes gas outlet branch pipe connected with the gas outlet pipe and gas inlet branch pipe connected with the gas inlet pipe, the gas outlet branch pipe is L-shaped inside the absorption device and the bottom end penetrates into the absorption liquid in the absorption device, and the gas inlet branch pipe is arranged above the absorption liquid level inside the absorption device.
[0012] As a preferred technical scheme of the utility model, methane content detector is installed on the gas inlet branch pipe, and the detection end of the methane content detector is arranged inside the gas inlet branch pipe.
[0013] As a preferred technical scheme of the utility model, the lower surface of the absorption device and the lower surface of the heating sleeve are both installed with support frames.
[0014] As a preferred technical scheme of the utility model, pressure reducing valves are installed on the gas outlet pipe and the gas inlet pipe.
[0015] Compared with the prior art, the utility model has the beneficial effects that: through the arrangement of multiple coal sample placing pipes and the installation of separately controlled heating sleeves and booster pumps on each coal sample placing pipe, CO2 displacement CH4 under different temperature and pressure conditions can be simulated, CO2 can enter each coal device at the same time to start displacement experiment, and then CO2 displacement effect under different temperature and pressure conditions can be observed at the same time, the simulation is more comprehensive, the experiment efficiency and experiment effect are improved, the difference of CO2 displacement CH4 efficiency under the same time, different temperature and pressure environments is convenient to research, and thus a reference direction for increasing coalbed methane production efficiency is provided. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is a structural schematic view of the utility model;
[0017] Figure 2 It is a side view structural schematic view of the utility model;
[0018] Figure 3 It is a partial side view structural schematic view of the utility model;
[0019] Figure 4 It is an internal structure schematic view of the absorption device of the utility model.
[0020] In the figure: 1 carbon dioxide high-pressure cylinder, 2 methane cylinder, 3 pressure reducing valve, 4 gas outlet pipe, 5 branch pipe, 51 gas outlet branch pipe, 52 gas inlet branch pipe, 6 gas inlet pipe, 7 coal sample placing pipe, 8 gas inlet valve, 9 gas outlet valve, 10 heating sleeve, 11 heater, 12 liquid exchange port, 13 temperature sensor, 14 booster pump, 15 pressure sensor, 16 absorption device, 17 methane content detector, 18 support frame. DETAILED DESCRIPTION
[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.
[0022] Please refer to Figures 1-4 The utility model provides a kind of technical scheme: a CO2 displacement coalbed gas simulation experiment device, including carbon dioxide high-pressure cylinder 1 and methane cylinder 2, for containing carbon dioxide gas and displacement methane gas respectively;The gas outlet of the carbon dioxide high-pressure cylinder 1 is provided with gas outlet pipe 4, and the one end of a plurality of branch pipes 5 is connected in parallel with gas outlet pipe 4, and the gas inlet of the methane cylinder 2 is provided with gas inlet pipe 6, and the other end of a plurality of branch pipes 5 is connected in parallel and communicated with gas inlet pipe 6, and a coal sample placing pipe 7 is installed on each branch pipe 5, and the branch pipe 5 is communicated with the inside of the coal sample placing pipe 7, and the carbon dioxide in the carbon dioxide high-pressure cylinder 1 enters the branch pipe 5 and then enters the coal sample placing pipe 7 through gas outlet pipe 4, to displace methane in coalbed, and then methane enters the methane cylinder 2 through the latter half of the branch pipe 5.
[0023] The coal sample placing pipe 7 is sleeved with heating sleeve 10 outside, for heating the coal sample placing pipe 7, and the booster pump 14 is installed on the heating sleeve 10, and the gas outlet end of the booster pump 14 penetrates through the heating sleeve 10 and is communicated with the inside of the coal sample placing pipe 7, and the inside of the coal sample placing pipe 7 is pressurized by the booster pump 14, and the device can simulate the CO2 displacement CH4 under different temperature and pressure conditions by being provided with a plurality of coal sample placing pipes 7 and being provided with separately controlled heating sleeve 10 and booster pump 14 on each coal sample placing pipe 7, CO2 can enter each coal sample placing device at the same time to start displacement experiment, and then the CO2 displacement effect under different temperature and pressure conditions can be observed at the same time, the simulation is more comprehensive, the experimental efficiency and experimental effect are improved, and the difference of CO2 displacement CH4 efficiency under different temperature and pressure environment at the same time is facilitated to be researched, to provide reference direction for increasing coalbed gas production efficiency.
[0024] Preferably, the branch pipe 5 is respectively provided with an air inlet valve 8 and an air outlet valve 9, which can be commonly used solenoid valves and are electrically connected with the controller, and the air inlet valve 8 and the air outlet valve 9 are respectively arranged on the two sides of the coal sample placing pipe 7 to control the air inlet and outlet of the coal sample placing pipe 7 and the branch pipe 5, and when a plurality of coal sample placing pipes 7 are not needed for experiments, the corresponding air inlet valve 8 and air outlet valve 9 can be closed, thereby improving the flexibility of experiments.
[0025] Preferably, the heating sleeve 10 is hollow and filled with a heating liquid such as pure water, and a plurality of heaters 11 are uniformly arranged in the radial direction of the heating sleeve 10, so that the heating liquid is heated by the heaters 11 to control the temperature inside the coal sample placing pipe 7, and the temperature control is more stable.
[0026] Further preferably, the heating sleeve 10 is provided with a liquid replacement opening 12 on the side surface, and the liquid replacement opening 12 is provided with a sealing cover, so that after long-term use of the heating sleeve 10, scale and the like can be generated inside the heating sleeve 10, the sealing cover can be opened to replace the heating liquid inside or clean the inside of the heating sleeve 10, so as to ensure the heating efficiency of the heating sleeve 10 and reduce energy consumption.
[0027] Preferably, the coal sample placing pipe 7 is provided with a temperature sensor 13, and the detection end of the temperature sensor 13 is arranged inside the coal sample placing pipe 7; the coal sample placing pipe 7 is provided with a pressure sensor 15, and the detection end of the pressure sensor 15 is arranged inside the coal sample placing pipe 7; the temperature and pressure inside the coal sample placing pipe 7 are detected by the temperature sensor 13 and the pressure sensor 15 respectively; the temperature sensor 13 and the pressure sensor 15, the heater 11, the booster pump 14 and the like are electrically connected with an external controller, and the controller is preferably a commonly used single-chip microcomputer or PLC controller, such as an Arduino series single-chip microcomputer or a Siemens S7 series PLC controller; the temperature sensor 13 and the pressure sensor 15 detect the temperature and pressure and transmit corresponding signals to the controller, and the controller automatically controls the switch and power of the heater 11 and the booster pump 14 according to preset temperature and pressure values, so as to realize automatic control of the temperature and pressure of the simulation experiment, thereby greatly improving the degree of automation.
[0028] Preferably, the branch pipe 5 is provided with an absorption device 16 for absorbing residual carbon dioxide near the methane cylinder 2, the absorption device 16 comprises a cylinder body provided with a liquid inlet, and the cylinder body is filled with a liquid capable of reacting with carbon dioxide but not dissolving methane, such as sodium hydroxide (NaOH) solution, ammonia water (NH3·H2O) or alkaline alcohol amine solution, etc., the branch pipe 5 comprises an outlet gas branch pipe 51 connected with the outlet gas pipe 4 and an inlet gas branch pipe 52 connected with the inlet gas pipe 6, the outlet gas branch pipe 51 is L-shaped inside the absorption device 16 and the bottom end penetrates into the absorption liquid in the absorption device 16, and the inlet gas branch pipe 52 is arranged above the liquid level of the absorption liquid inside the absorption device 16, if the gas discharged from the outlet gas branch pipe 51 contains residual carbon dioxide, the residual carbon dioxide will react with the solution in the absorption device 16 to eliminate the residual carbon dioxide, so as to reduce the influence of CO2 on the CH4 content test and improve the accuracy of the experimental results.
[0029] Preferably, the inlet gas branch pipe 52 is provided with a methane content detector 17, the detection end of the methane content detector 17 is arranged inside the inlet gas branch pipe 52, and the methane content detector 17 is used for detecting the content of the displaced methane, the methane content detector 17 can be a commonly used methane detector, etc., the methane content detector 17 is electrically connected with the controller, the inlet valve 8, the outlet valve 9, the methane content detector 17, the temperature sensor 13, the pressure sensor 15, the heater 11 and the booster pump 14 used in the application are all electronic components commonly used in the prior art, and the specific structure, working principle, control mode and circuit connection are all known technologies, which will not be described in detail here.
[0030] Optionally, the lower surfaces of the absorption device 16 and the heating sleeve 10 are both provided with support frames 18 for supporting the absorption device 16 and the heating sleeve 10 and improving the overall stability of the device.
[0031] Preferably, the outlet gas pipe 4 and the inlet gas pipe 6 are both provided with pressure reducing valves 3 for reducing the higher input pressure to the required output pressure and maintaining the stability of the output pressure, thereby improving the safety of the experiment.
[0032] The parts not disclosed in the utility model are all prior art, and the specific structure, materials and working principle will not be described in detail. Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.
Claims
1. A CO2 displacement coalbed methane simulation experiment device, comprising a carbon dioxide high-pressure gas cylinder (1) and a methane gas cylinder (2), characterized in that: The gas outlet of the high-pressure carbon dioxide cylinder (1) is provided with a gas outlet pipe (4) which is connected in parallel with one end of a plurality of branch pipes (5), the gas inlet of the methane cylinder (2) is provided with a gas inlet pipe (6), the other end of the plurality of branch pipes (5) is connected in parallel and communicated with the gas inlet pipe (6), a coal sample placing pipe (7) is installed on each branch pipe (5), the branch pipe (5) is communicated with the inside of the coal sample placing pipe (7), a heating sleeve (10) is sleeved outside the coal sample placing pipe (7), a booster pump (14) is installed on the heating sleeve (10), and the gas outlet end of the booster pump (14) penetrates through the heating sleeve (10) and is communicated with the inside of the coal sample placing pipe (7).
2. The CO2 displacement coalbed methane simulation experiment device according to claim 1, characterized in that: The branch pipe (5) is respectively provided with an air inlet valve (8) and an air outlet valve (9), and the air inlet valve (8) and the air outlet valve (9) are installed on the two sides of the coal sample placing pipe (7).
3. The CO2 displacement coalbed methane simulation experiment device according to claim 1, characterized in that: The heating sleeve (10) is hollow and filled with a heating liquid, and a plurality of heaters (11) are uniformly arranged in the radial direction of the heating sleeve (10).
4. The CO2 displacement coalbed methane simulation experiment device according to claim 3, characterized in that: The side surface of the heating sleeve (10) is provided with a liquid replacement opening (12), and the liquid replacement opening (12) is provided with a sealing cover.
5. The CO2 displacement coalbed methane simulation experiment device according to claim 1, characterized in that: The coal sample placing pipe (7) is provided with a temperature sensor (13), and the detection end of the temperature sensor (13) is arranged in the inside of the coal sample placing pipe (7).
6. The CO2 displacement coalbed methane simulation experiment device according to claim 1, characterized in that: The coal sample placing pipe (7) is provided with a pressure sensor (15), and the detection end of the pressure sensor (15) is arranged in the inside of the coal sample placing pipe (7).
7. The CO2 displacement coalbed methane simulation experiment device according to claim 1, characterized in that: An absorption device (16) for absorbing residual carbon dioxide is installed on the branch pipe (5) close to the methane cylinder (2), the absorption device (16) includes a cylinder body, the branch pipe (5) includes an air outlet branch pipe (51) connected with the air outlet pipe (4) and an air inlet branch pipe (52) connected with the air inlet pipe (6), the air outlet branch pipe (51) is L-shaped inside the absorption device (16) and the bottom end penetrates into the absorption liquid in the absorption device (16), and the air inlet branch pipe (52) is arranged above the liquid level of the absorption liquid inside the absorption device (16).
8. The CO2 displacement coalbed methane simulation experiment device according to claim 7, characterized in that: A methane content detector (17) is installed on the air inlet branch pipe (52), and the detection end of the methane content detector (17) is arranged inside the air inlet branch pipe (52).
9. The CO2 displacement coalbed methane simulation experiment device according to claim 7, characterized in that: The lower surfaces of the absorption device (16) and the heating sleeve (10) are both provided with a support frame (18).
10. The CO2 displacement coalbed methane simulation experiment device according to any one of claims 1-9, characterized in that: The air outlet pipe (4) and the air inlet pipe (6) are both provided with a pressure reducing valve (3).