CN219065186U - Carbon dioxide distribution monitoring simulation system in carbon dioxide displacement methane process - Google Patents
Carbon dioxide distribution monitoring simulation system in carbon dioxide displacement methane process Download PDFInfo
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- CN219065186U CN219065186U CN202222991474.XU CN202222991474U CN219065186U CN 219065186 U CN219065186 U CN 219065186U CN 202222991474 U CN202222991474 U CN 202222991474U CN 219065186 U CN219065186 U CN 219065186U
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Abstract
The utility model provides a carbon dioxide displacement methane in-process carbon dioxide distribution monitoring analog system, including methane steel bottle, the carbon dioxide steel bottle, coal reservoir analog system, gas injection system and gas monitoring system, be provided with the coal reservoir in the coal reservoir analog system, the gas inlet end that all is connected with the coal reservoir analog system through gas injection system in the gas outlet end of methane steel bottle and carbon dioxide steel bottle, gas injection system is with methane and carbon dioxide injection into in the coal reservoir respectively, gas monitoring system's monitoring end is inserted and is established in the coal reservoir, gas monitoring system real-time supervision gas concentration and pressure variation in the coal reservoir. The utility model can simulate the real coal reservoir condition, realize the monitoring of the distribution rule of carbon dioxide in the coal reservoir under different injection pressure and injection flow conditions, and provide basis for on-site carbon dioxide coal seam sealing.
Description
Technical Field
The utility model relates to the technical field of carbon dioxide geological sequestration, in particular to a carbon dioxide distribution monitoring simulation system in a carbon dioxide displacement methane process.
Background
In recent years, due to the increasingly serious greenhouse effect caused by excessive carbon dioxide emission, a series of environmental problems such as glacier melting, sea level rising and the like are caused, and positive measures are urgently needed to promote the achievement of 'net zero emission' of greenhouse gases, namely the realization of balance between artificial removal and artificial emission, which is also called 'carbon neutralization (Carbon Neutrality'). Coal seam CO 2 Geological storage and CH 4 Enhanced mining (CO) 2 ECBM) has economic and environmental benefits by injecting carbon dioxide into the coal seam to displace methane in the coal seam, and has received wide attention both at home and abroad.
After carbon dioxide is injected into a coal bed, how the carbon dioxide is distributed in the coal bed, how different injection pressure and other conditions influence the distribution of the carbon dioxide, people cannot give objective evaluation, and how to realize the distribution monitoring of the carbon dioxide in the coal bed becomes a problem to be solved urgently.
Disclosure of Invention
The utility model aims to provide a carbon dioxide distribution monitoring simulation system in the process of carbon dioxide displacement methane, which can simulate real coal reservoir conditions, realize monitoring of carbon dioxide distribution rules in the coal reservoir under different injection pressure and injection flow conditions, namely monitoring of carbon dioxide diffusion conditions in the coal reservoir in the process of carbon dioxide displacement methane, reduce investment risk and provide basis for on-site carbon dioxide coal seam sealing.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a carbon dioxide displacement methane in-process carbon dioxide distribution monitoring analog system, including methane steel bottle, the carbon dioxide steel bottle, coal reservoir analog system, gas injection system and gas monitoring system, be provided with the coal reservoir in the coal reservoir analog system, the gas inlet end that all is connected with the coal reservoir analog system through gas injection system in the gas outlet end of methane steel bottle and carbon dioxide steel bottle, gas injection system is with methane and carbon dioxide injection into in the coal reservoir respectively, gas monitoring system's monitoring end is inserted and is established in the coal reservoir, gas monitoring system real-time supervision gas concentration and pressure variation in the coal reservoir.
The coal reservoir simulation system comprises a box body, a water tank, a water injection pump and a temperature controller, wherein the front side of the box body is open, a sliding door is arranged at the left side of the front side opening of the box body in a sliding manner, the box body and the sliding door are made of toughened glass, a coal seam bottom plate, a coal reservoir, a plurality of layers of coal seam top plates of different types, a pressure equalizing steel plate and a pressurizing bag are sequentially paved in the box body from bottom to top, the top of the pressurizing bag is contacted with the inner wall of the box body top plate, the water tank and the water injection pump are arranged outside the box body, a water outlet of the water tank is connected with a water inlet of the water injection pump through a water outlet pipe, a water outlet of the water injection pipe penetrates through the upper side part of a side plate of the box body and stretches into the box body, a water outlet of the water injection pipe is connected with a side water inlet of the pressurizing bag, and the inner wall of the box body is provided with an electric heating interlayer, and the temperature controller is in signal connection with the electric heating interlayer.
The gas injection system comprises a first gas injection pipe, the top gas outlet end of a methane steel cylinder is connected with the gas inlet end of the first gas injection pipe, the gas outlet end of the first gas injection pipe vertically penetrates through the top plate of the box body, the pressurizing bag, the pressure equalizing steel plates and the top plates of all layers of coal seams downwards in a concentric mode and is inserted into a coal reservoir, a first valve, a first injection pump, a flow sensor, a second valve and a first gas pressure sensor are sequentially arranged on the first gas injection pipe along the gas flow direction, the top gas outlet end of the carbon dioxide steel cylinder is connected with a second gas injection pipe, the gas outlet end of the second gas injection pipe is connected to the first gas injection pipe between the first injection pump and the flow sensor, and a third valve and a second injection pump are sequentially arranged on the second gas injection pipe along the gas flow direction.
The gas monitoring system comprises a computer, a plurality of chromatographic sampling tubes and a plurality of pressure sampling tubes, wherein each chromatographic sampling tube and each pressure sampling tube are uniformly arranged in a plurality of concentric circles and vertically penetrate through a coal seam bottom plate to be arranged, the chromatographic sampling tubes and the pressure sampling tubes which are located on the same circumference are arranged at intervals in the circumferential direction, the upper ends of each chromatographic sampling tube and each pressure sampling tube are inserted into a coal reservoir, the lower ends of each chromatographic sampling tube are connected with a gas chromatograph, the lower ends of each pressure sampling tube are connected with a second gas pressure sensor, and the computer is respectively connected with the first gas pressure sensor, the gas chromatograph and each second gas pressure sensor in a signal mode.
By adopting the technical scheme, the carbon dioxide distribution monitoring simulation method in the process of displacing methane by carbon dioxide specifically comprises the following steps:
1. assembling a carbon dioxide distribution monitoring simulation system in the process of carbon dioxide displacement methane;
2. preparing a coal reservoir and a coal seam roof by a coal reservoir simulation system according to the type of the real coal seam roof, and simulating the pressure of the real roof;
3. injecting methane into the coal reservoir through the gas injection system, wherein the methane diffuses in the coal reservoir until the design pressure is reached;
4. injecting carbon dioxide into the coal reservoir through the gas injection system, wherein the carbon dioxide starts to enter the coal reservoir to diffuse and displace methane until the design pressure is reached;
5. in the carbon dioxide injection process, monitoring gas concentration changes and pressure changes at different positions in a coal reservoir in real time through a gas monitoring system, and analyzing the distribution rule of carbon dioxide in the coal reservoir according to monitoring results;
6. and (3) changing the gas injection pressure, the injection flow and the roof pressure, simulating different coal reservoir conditions, repeating the experimental steps, and analyzing the influence of the gas injection pressure, the injection flow and the roof pressure on the carbon dioxide distribution in the coal reservoir.
The second step is specifically as follows: the method comprises the steps of opening a sliding door, according to the type of a real coal seam roof, sequentially paving a coal seam bottom plate, a coal reservoir, each layer of coal seam roof, a pressure equalizing steel plate and a pressurizing bag in a box body from bottom to top according to the similar ratio, uniformly arranging all chromatographic sampling tubes and all pressure sampling tubes in a plurality of concentric circles in the process of paving the coal seam bottom plate and the coal reservoir to vertically penetrate through the coal seam bottom plate, inserting the upper ends of all chromatographic sampling tubes and all pressure sampling tubes into the coal reservoir, enabling the air outlet end of a first air injection pipe to vertically penetrate through the roof of the box body, the pressurizing bag, the pressure equalizing steel plate and all layers of coal seam roof in a concentric manner and to be inserted into the coal reservoir, closing the sliding door, adjusting an electric heating interlayer through a temperature controller, adjusting the temperature inside the box body to a design temperature, simulating different stratum temperatures under the ground, starting a water injection pump, injecting water in the water tank into the pressurizing bag through the water injection pipe, enabling the pressurizing bag to downwards to pressurize, and simulating the real coal seam pressure.
The step (III) is specifically as follows: opening a first valve and a second valve, starting a first injection pump, injecting methane in a methane steel cylinder into a coal reservoir through a first gas injection pipe by the first injection pump, monitoring the injection flow of the methane in real time through a flow sensor, monitoring the injection pressure of the methane in real time through a first gas pressure sensor, and closing the first valve, the second valve and the first injection pump when the design pressure is reached, and stopping injecting the methane.
The step (IV) is specifically as follows: and opening the second valve and the third valve, starting the second injection pump, injecting carbon dioxide in the carbon dioxide steel cylinder into the coal reservoir through the second gas injection pipe and the first gas injection pipe by the second injection pump, then starting to enter the coal reservoir for diffusion and displacement of methane, monitoring the injection flow of the carbon dioxide in real time through the flow sensor, monitoring the injection pressure of the carbon dioxide in real time through the first gas pressure sensor, and closing the second valve, the third valve and the second injection pump when the design pressure is reached, and stopping injecting the carbon dioxide.
The step (V) is specifically as follows: in the carbon dioxide injection process, each gas chromatograph monitors the gas concentration change of different positions in the coal reservoir in real time through corresponding each chromatographic sampling tube respectively, namely, the carbon dioxide concentration and the methane concentration of different positions in the coal reservoir are obtained respectively, meanwhile, each second gas pressure sensor monitors the gas pressure change of different positions in the coal reservoir in real time through corresponding each pressure sampling tube respectively, a computer records the data monitored by each gas chromatograph and each second gas pressure sensor, and according to the monitoring result, then, the pressure of the carbon dioxide and the methane pressure of different positions in the coal reservoir can be calculated, so that the distribution rule of the carbon dioxide in different positions in the coal reservoir is obtained.
Compared with the prior art, the utility model has substantial characteristics and progress, in particular to the utility model can simulate the real coal reservoir condition, realize monitoring the distribution rule of carbon dioxide in the coal reservoir under different injection pressure and injection flow conditions, namely monitoring the diffusion condition of carbon dioxide in the coal reservoir in the process of displacing methane by carbon dioxide, reduce investment risk and provide basis for on-site carbon dioxide coal seam sealing.
The box body and the sliding door are made of toughened glass, and the toughened glass not only can bear certain pressure, but also can observe the conditions of the coal reservoir and the coal seam roof in the box body.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
FIG. 2 is a schematic diagram of the structure of the coal reservoir simulation system of the present utility model.
FIG. 3 is a schematic representation of the distribution of a first gas injection tube, each chromatographic sampling tube and each pressure sampling tube of the present utility model in a coal reservoir.
Detailed Description
Embodiments of the present utility model are further described below with reference to the accompanying drawings.
As shown in fig. 1-3, a carbon dioxide distribution monitoring simulation system in a carbon dioxide displacement methane process comprises a methane steel cylinder 13, a carbon dioxide steel cylinder 14, a coal reservoir simulation system, a gas injection system and a gas monitoring system, wherein a coal reservoir 1 is arranged in the coal reservoir simulation system, gas outlet ends of the methane steel cylinder 13 and the carbon dioxide steel cylinder 14 are connected with a gas inlet end of the coal reservoir simulation system through the gas injection system, the gas injection system respectively injects methane and carbon dioxide into the coal reservoir 1, a monitoring end of the gas monitoring system is inserted into the coal reservoir 1, and the gas monitoring system monitors gas concentration and pressure change in the coal reservoir 1 in real time.
The coal reservoir 1 simulation system comprises a box body 3, a water tank 4, a water injection pump 5 and a temperature controller 6, wherein the front side of the box body 3 is open, a sliding door 7 is arranged at the front side opening of the box body 3 in a left-right sliding mode, the box body 3 and the sliding door 7 are made of toughened glass, a coal seam bottom plate 8, a coal reservoir 1, a plurality of layers of different types of coal seam top plates 2, pressure equalizing steel plates 9 and a pressurizing bag 10 are sequentially paved in the box body 3 from bottom to top, the top of the pressurizing bag 10 is in contact with the inner wall of the top plate of the box body 3, the water tank 4 and the water injection pump 5 are arranged outside the box body 3, a water outlet of the water tank 4 is connected with a water inlet of the water injection pump 5 through a water outlet pipe 11, a water outlet of the water injection pipe 12 penetrates through the upper side plate of the box body 3 and stretches into the box body 3, a water outlet of the water inlet of the water injection pipe 12 is connected with a side water inlet of the pressurizing bag 10, an electric heating interlayer (not shown in the figure) is arranged on the inner wall of the box body 3, and the temperature controller 6 is in signal connection with the electric heating interlayer.
The gas injection system comprises a first gas injection pipe 15, the top gas outlet end of a methane steel cylinder 13 is connected with the gas inlet end of the first gas injection pipe 15, the gas outlet end of the first gas injection pipe 15 vertically penetrates through the top plate of the box body 3, the pressurizing bag 10, the pressure equalizing steel plate 9 and the coal seam top plates 2 of each layer downwards in a concentric mode and is inserted into the coal reservoir 1, a first valve 16, a first injection pump 17, a flow sensor 18, a second valve 19 and a first gas pressure sensor 20 are sequentially arranged on the first gas injection pipe 15 along the gas flow direction, the top gas outlet end of the carbon dioxide steel cylinder 14 is connected with a second gas injection pipe 21, the gas outlet end of the second gas injection pipe is connected to the first gas injection pipe 15 between the first injection pump 17 and the flow sensor 18, and a third valve 22 and a second injection pump 23 are sequentially arranged on the second gas injection pipe along the gas flow direction.
The gas monitoring system comprises a computer 24, a plurality of chromatographic sampling pipes 25 and a plurality of pressure sampling pipes 26, wherein each chromatographic sampling pipe 25 and each pressure sampling pipe 26 are uniformly arranged in a plurality of concentric circles and vertically penetrate through the coal seam bottom plate 8, the chromatographic sampling pipes 25 and the pressure sampling pipes 26 which are positioned on the same circumference are arranged at intervals in the circumferential direction, the upper ends of each chromatographic sampling pipe 25 and each pressure sampling pipe 26 are inserted into the coal reservoir 1, the lower ends of each chromatographic sampling pipe 25 are connected with a gas chromatograph 27, the lower ends of each pressure sampling pipe 26 are connected with a second gas pressure sensor 28, and the computer 24 is respectively connected with the first gas pressure sensor 20, the gas chromatograph 27 and each second gas pressure sensor 28 in a signal manner.
By adopting the technical scheme, the carbon dioxide distribution monitoring simulation method in the process of displacing methane by carbon dioxide specifically comprises the following steps:
1. assembling a carbon dioxide distribution monitoring simulation system in the process of carbon dioxide displacement methane;
2. preparing a coal reservoir 1 and a coal seam roof 2 through a coal reservoir simulation system according to the type of the real coal seam roof, and simulating the real roof pressure;
3. injecting methane into the coal reservoir 1 through a gas injection system, and diffusing the methane in the coal reservoir 1 until the design pressure is reached;
4. injecting carbon dioxide into the coal reservoir 1 through a gas injection system, wherein the carbon dioxide starts to enter the coal reservoir 1 to diffuse and displace methane until reaching the design pressure;
5. in the carbon dioxide injection process, monitoring gas concentration changes and pressure changes at different positions in the coal reservoir 1 in real time through a gas monitoring system, and analyzing the distribution rule of carbon dioxide in the coal reservoir 1 according to monitoring results;
6. and (3) changing the gas injection pressure, the injection flow and the roof pressure, simulating the conditions of different coal reservoirs 1, repeating the experimental steps, and analyzing the influence of the gas injection pressure, the injection flow and the roof pressure on the carbon dioxide distribution in the coal reservoirs 1.
The second step is specifically as follows: the sliding door 7 is opened, the coal seam bottom plate 8, the coal reservoir 1, the coal seam top plates 2 of each layer, the pressure equalizing steel plates 9 and the pressurizing bag 10 are sequentially paved inside the box body 3 from bottom to top according to the similar ratio, in the process of paving the coal seam bottom plate 8 and the coal reservoir 1, each chromatographic sampling tube 25 and each pressure sampling tube 26 are uniformly arranged in a plurality of concentric circles and vertically penetrate through the coal seam bottom plate 8, the upper ends of each chromatographic sampling tube 25 and each pressure sampling tube 26 are inserted into the coal reservoir 1, then the air outlet end of the first air injection pipe 15 vertically penetrates through the top plate of the box body 3, the pressurizing bag 10, the pressure equalizing steel plates 9 and each layer coal seam top plate 2 from bottom to top, and is inserted into the coal reservoir 1, the sliding door 7 is closed, the electric heating interlayer is regulated through the temperature controller 6, the internal temperature of the box body 3 is regulated to the design temperature, the underground different stratum temperatures are simulated, the water injection pump 5 is started, water in the water tank 4 is injected into the pressurizing bag 10 through the water injection pipe 12, the pressurizing bag 10 is downwards, and the actual coal seam pressure is simulated.
The step (III) is specifically as follows: the first valve 16 and the second valve 19 are opened, the first injection pump 17 is started, the first injection pump 17 injects methane in the methane steel cylinder 13 into the coal reservoir 1 through the first gas injection pipe 15, the injection flow of the methane is monitored in real time through the flow sensor 18, the injection pressure of the methane is monitored in real time through the first gas pressure sensor 20, and when the design pressure is reached, the first valve 16, the second valve 19 and the first injection pump 17 are closed, and the injection of the methane is stopped.
The step (IV) is specifically as follows: the second valve 19 and the third valve 22 are opened, the second injection pump 23 is started, the second injection pump 23 injects the carbon dioxide in the carbon dioxide steel cylinder 14 into the coal reservoir 1 through the second gas injection pipe and the first gas injection pipe 15, then the carbon dioxide starts to enter the coal reservoir 1 to diffuse and displace methane, the injection flow of the carbon dioxide is monitored in real time through the flow sensor 18, the injection pressure of the carbon dioxide is monitored in real time through the first gas pressure sensor 20, and when the design pressure is reached, the second valve 19, the third valve 22 and the second injection pump 23 are closed, and the injection of the carbon dioxide is stopped.
The step (V) is specifically as follows: in the carbon dioxide injection process, each gas chromatograph 27 monitors the gas concentration changes at different positions in the coal reservoir 1 in real time through the corresponding chromatographic sampling tube 25 respectively, namely, the carbon dioxide concentration and the methane concentration at different positions in the coal reservoir 1 are obtained respectively, meanwhile, each second gas pressure sensor 28 monitors the gas pressure changes at different positions in the coal reservoir 1 in real time through the corresponding pressure sampling tube 26 respectively, the computer 24 records the data monitored by each gas chromatograph 27 and each second gas pressure sensor 28, and according to the monitoring result, the pressure of the carbon dioxide and the methane pressure at different positions in the coal reservoir 1 can be calculated, so that the distribution rule of the analyzed carbon dioxide at different positions in the coal reservoir 1 is obtained.
The water injection pump 5, the temperature controller 6, the sliding door 7, the electric heating interlayer, the first injection pump 17, the flow sensor 18, the first gas pressure sensor 20, the second injection pump 23, the computer 24, the gas chromatograph 27 and the second gas pressure sensor 28 are all conventional technologies, and the specific construction and the working principle are not repeated.
The utility model can simulate the real condition of the coal reservoir 1, realize the monitoring of the distribution rule of carbon dioxide in the coal reservoir 1 under the condition of different injection pressure and injection flow, namely, monitor the diffusion condition of carbon dioxide in the coal reservoir 1 in the process of carbon dioxide displacement methane, reduce investment risk and provide basis for on-site carbon dioxide coal seam sealing.
The box body 3 and the sliding door 7 are made of toughened glass, and the toughened glass not only can bear certain pressure, but also can observe the conditions of the coal reservoir 1 and the coal seam roof 2 in the box body 3.
The above embodiments are merely for illustrating the technical aspects of the present utility model, and it should be understood by those skilled in the art that the present utility model is described in detail with reference to the above embodiments; modifications and equivalents may be made thereto without departing from the spirit and scope of the utility model, which is intended to be encompassed by the claims.
Claims (4)
1. A carbon dioxide distribution monitoring simulation system in a carbon dioxide displacement methane process is characterized in that: the system comprises a methane steel bottle, a carbon dioxide steel bottle, a coal reservoir simulation system, a gas injection system and a gas monitoring system, wherein a coal reservoir is arranged in the coal reservoir simulation system, the gas outlet ends of the methane steel bottle and the carbon dioxide steel bottle are connected with the gas inlet end of the coal reservoir simulation system through the gas injection system, the gas injection system is used for injecting methane and carbon dioxide into the coal reservoir respectively, the monitoring end of the gas monitoring system is inserted into the coal reservoir, and the gas monitoring system is used for monitoring the gas concentration and the pressure change in the coal reservoir in real time.
2. The carbon dioxide distribution monitoring simulation system in a carbon dioxide displacement methane process of claim 1, wherein: the coal reservoir simulation system comprises a box body, a water tank, a water injection pump and a temperature controller, wherein the front side of the box body is open, a sliding door is arranged at the left side of the front side opening of the box body in a sliding manner, the box body and the sliding door are made of toughened glass, a coal seam bottom plate, a coal reservoir, a plurality of layers of coal seam top plates of different types, a pressure equalizing steel plate and a pressurizing bag are sequentially paved in the box body from bottom to top, the top of the pressurizing bag is contacted with the inner wall of the box body top plate, the water tank and the water injection pump are arranged outside the box body, a water outlet of the water tank is connected with a water inlet of the water injection pump through a water outlet pipe, a water outlet of the water injection pipe penetrates through the upper side part of a side plate of the box body and stretches into the box body, a water outlet of the water injection pipe is connected with a side water inlet of the pressurizing bag, and the inner wall of the box body is provided with an electric heating interlayer, and the temperature controller is in signal connection with the electric heating interlayer.
3. The carbon dioxide distribution monitoring simulation system in a carbon dioxide displacement methane process of claim 2, wherein: the gas injection system comprises a first gas injection pipe, the top gas outlet end of a methane steel cylinder is connected with the gas inlet end of the first gas injection pipe, the gas outlet end of the first gas injection pipe vertically penetrates through the top plate of the box body, the pressurizing bag, the pressure equalizing steel plates and the top plates of all layers of coal seams downwards in a concentric mode and is inserted into a coal reservoir, a first valve, a first injection pump, a flow sensor, a second valve and a first gas pressure sensor are sequentially arranged on the first gas injection pipe along the gas flow direction, the top gas outlet end of the carbon dioxide steel cylinder is connected with a second gas injection pipe, the gas outlet end of the second gas injection pipe is connected to the first gas injection pipe between the first injection pump and the flow sensor, and a third valve and a second injection pump are sequentially arranged on the second gas injection pipe along the gas flow direction.
4. A carbon dioxide distribution monitoring simulation system in a carbon dioxide displacement methane process according to claim 3, wherein: the gas monitoring system comprises a computer, a plurality of chromatographic sampling tubes and a plurality of pressure sampling tubes, wherein each chromatographic sampling tube and each pressure sampling tube are uniformly arranged in a plurality of concentric circles and vertically penetrate through a coal seam bottom plate to be arranged, the chromatographic sampling tubes and the pressure sampling tubes which are located on the same circumference are arranged at intervals in the circumferential direction, the upper ends of each chromatographic sampling tube and each pressure sampling tube are inserted into a coal reservoir, the lower ends of each chromatographic sampling tube are connected with a gas chromatograph, the lower ends of each pressure sampling tube are connected with a second gas pressure sensor, and the computer is respectively connected with the first gas pressure sensor, the gas chromatograph and each second gas pressure sensor in a signal mode.
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