CN115818099A - Evaluation method for carbon dioxide sequestration effect of different types of coal seam roofs - Google Patents
Evaluation method for carbon dioxide sequestration effect of different types of coal seam roofs Download PDFInfo
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- CN115818099A CN115818099A CN202211301618.2A CN202211301618A CN115818099A CN 115818099 A CN115818099 A CN 115818099A CN 202211301618 A CN202211301618 A CN 202211301618A CN 115818099 A CN115818099 A CN 115818099A
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Abstract
A method for evaluating the effect of carbon dioxide sequestration of different types of coal seam roofs comprises the following steps: 1. assembling an experimental system for evaluating the effect of carbon dioxide sequestration of different types of coal seam roofs, wherein the experimental system comprises a coal seam roof simulation system, a carbon dioxide injection system and a sequestration monitoring evaluation system; 2. manufacturing a coal seam roof through a coal seam roof simulation system, and simulating real coal seam pressure; 3. injecting carbon dioxide into the coal bed through a carbon dioxide injection system; 4. monitoring and recording the pressure of different positions of the coal seam roof through a sealing monitoring and evaluating system, and evaluating the effect of sealing carbon dioxide in the coal seam roof; 5. and (4) changing the type of a coal seam roof, the coal seam pressure and the carbon dioxide injection pressure, and evaluating the carbon dioxide sequestration effect. The invention can simulate real coal seams and different types of coal seam roofs, realize the evaluation of the carbon dioxide sequestration effect of the different types of coal seam roofs, reduce the investment risk and provide a basis for on-site carbon dioxide coal seam sequestration.
Description
Technical Field
The invention relates to the technical field of geological sequestration of carbon dioxide, in particular to an evaluation method for the sequestration effect of carbon dioxide on different types of coal seam roofs.
Background
With the development of global economy and the continuous increase of the level of industrialization, the consumption of fossil energy (coal, oil, natural gas, etc.) is rapidly increased, and the large-scale emission of greenhouse gases, mainly represented by carbon dioxide, is accompanied, resulting in the continuous warming of global temperature for nearly 100 years. Reducing the concentration of carbon dioxide in the atmosphere through carbon dioxide storage is an effective means for slowing down the global warming effect. Carbon dioxide storage technologies are broadly classified into geological storage, biological storage, marine storage, mineral storage (ore carbonization), and industrial utilization. Geological storage is the most effective and economical permanent carbon dioxide storage technology and is divided into depleted oil and gas reservoir storage, carbon dioxide injection for oil displacement and recovery ratio improvement, deep saline reservoir storage and deep coal seam sealing (CO) for enhancing coal seam gas exploitation 2 -ECBM)。
Coal bed carbon dioxide geological storage and methane enhancement development technology (CO) 2 ECBM) can realize the greenhouse gas CO while improving the recovery ratio of the coal bed methane 2 The effective sealing and storage of the product. Due to CO 2 Potential leakage of coal seam sealingAnd the risk is exposed, so the effect evaluation of the carbon dioxide sealed and stored on different types of roofs is required.
The sealing effect of the coal seam roof of which type is effective and the sealing effect of the coal seam roof of which type is ineffective, people can not give objective evaluation, so that the blindness of engineering and the increase of investment risk are caused, and the field popularization and application of the sealing of the carbon dioxide coal seam are limited to a certain extent.
How to evaluate the effect of carbon dioxide sequestration of different types of coal seam roofs becomes a hotspot of wide attention. At present, a method for evaluating the carbon dioxide sequestration effect is urgently needed, so that the high-efficiency and accurate evaluation of the sequestration effect of carbon dioxide on different types of coal seam roofs is realized, and a theoretical basis is provided for on-site carbon dioxide coal seam sequestration.
Disclosure of Invention
The invention aims to provide an evaluation method for the carbon dioxide sequestration effect of different types of coal seam roofs, which can simulate real coal seams and different types of coal seam roofs, realize evaluation on the carbon dioxide sequestration effect of the different types of coal seam roofs, reduce investment risks and provide a basis for on-site carbon dioxide coal seam sequestration.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for evaluating the effect of carbon dioxide sequestration of different types of coal seam roofs comprises the following steps:
1. assembling an experimental system for evaluating the effect of carbon dioxide sequestration of different types of coal seam roofs, wherein the experimental system comprises a coal seam roof simulation system, a carbon dioxide injection system and a sequestration monitoring evaluation system;
2. manufacturing a coal seam roof through a coal seam roof simulation system according to the type of the real coal seam roof, and simulating the pressure of the real coal seam;
3. injecting carbon dioxide into the coal bed through a carbon dioxide injection system until the design pressure is reached;
4. monitoring and recording the pressure of different positions of the coal seam roof through a sealing monitoring and evaluating system, and evaluating the effect of sealing carbon dioxide in the coal seam roof according to the recorded pressure data;
5. the type of the coal seam roof, the coal seam pressure and the carbon dioxide injection pressure are changed, different coal seam roof conditions are simulated, and then the carbon dioxide sequestration effect is evaluated through the sequestration monitoring evaluation system.
The coal bed top plate simulation system comprises a box body, a temperature controller, a water tank and a water injection pump, wherein the box body is made of toughened glass, the front side of the box body is open, a toughened sliding door is arranged on the front side opening of the box body in a left-right sliding mode, an electric heating interlayer is arranged on the inner wall of the box body, the temperature controller is arranged outside the box body and is in signal connection with the electric heating interlayer, a coal bed bottom plate, a coal bed, a plurality of layers of coal bed top plates of different types, a steel plate and a pressurizing bag are sequentially paved inside the box body from bottom to top, the water tank and the water injection pump are both arranged outside the box body, the water outlet end of the water tank is connected with the water inlet end of the water injection pump through a water outlet pipe, the water outlet end of the water injection pipe penetrates through the upper side portion of a side plate of the box body and extends into the box body, and the water outlet end of the water injection pipe is connected with the water inlet end of the pressurizing bag.
The carbon dioxide injection system comprises a carbon dioxide steel cylinder, wherein the top gas outlet end of the carbon dioxide steel cylinder is connected with a gas injection pipe, a gas injection valve, a carbon dioxide delivery pump and a first pressure sensor are sequentially arranged on the gas injection pipe along the gas flowing direction, and the gas outlet end of the gas injection pipe concentrically vertically penetrates through a top plate, a pressurizing bag and each layer of coal seam top plate of the box body downwards and is inserted into the coal seam.
The sealing monitoring and evaluating system comprises a computer and a plurality of rows of second pressure sensors, the second pressure sensors in each row are correspondingly installed in the top plate of each layer at intervals from top to bottom, the distances between the second pressure sensors in each row and the top surface of the coal bed are x, 3x, 5x, and two, each row of second pressure sensors comprises three second pressure sensors, the three second pressure sensors are uniformly arranged in the corresponding coal bed top plate at equal intervals from left to right, and the computer is in signal connection with the first pressure sensors and the second pressure sensors.
The step (II) is specifically as follows: open the tempering push-and-pull door, according to true coal seam roof type, according to the similarity ratio, with the coal seam bottom plate, the coal seam, each layer coal seam roof, steel sheet and pressurization bag are laid in proper order in the box from bottom to top, at the in-process of laying, install each row of second pressure sensor in each layer different grade type coal seam roof in proper order from top to bottom at the interval, pass the roof of box with the end of giving vent to anger of gas injection pipe concentric vertical downwards again, pressurization bag and each layer coal seam roof insert in the coal seam, close the tempering push-and-pull door again, with the front side mouth shutoff of box, then start the water injection pump, the water in the water injection pump passes through the water injection pipe and pours into the pressurization bag into, make the pressurization bag exert pressure downwards, simulate true coal seam pressure, constitute complete experimental system.
The step (III) is specifically as follows: the gas injection valve is opened, the carbon dioxide delivery pump is started, the carbon dioxide gas in the carbon dioxide steel cylinder is injected into the coal bed through the gas injection pipe by the carbon dioxide delivery pump, the pressure in the gas injection pipe is monitored in real time through the first pressure sensor, when the pressure in the gas injection pipe reaches the design pressure, the gas injection valve and the carbon dioxide delivery pump are closed, and the injection of the carbon dioxide is stopped.
The step (IV) is specifically as follows: the second pressure sensors in each row respectively and correspondingly monitor the gas pressure in the coal seam roof of each layer, and transmit the monitored pressure data to the computer, and if the pressure data monitored by the second pressure sensors in the first row are X1, X2 and X3, the gas pressure in the coal seam roof of the first layer is recorded as (X1 + X2+ X3)/3; the pressure data monitored by the second row of second pressure sensors are X4, X5 and X6, and the gas pressure in the roof of the second layer of coal seam is recorded as (X4 + X5+ X6)/3; the pressure data monitored by the second pressure sensor in the third row are X7, X8 and X9, and then the gas pressure in the top plate of the third layer of coal seam is recorded as (X7 + X8+ X9)/3; the gas pressure records in the coal seam roof of each layer are obtained through monitoring of the corresponding second pressure sensors of each row, and the carbon dioxide sealing effect of the coal seam roof is evaluated according to the recorded pressure data.
Compared with the prior art, the invention has outstanding substantive characteristics and obvious progress, and particularly can simulate real coal seams and different types of coal seam roofs, realize the evaluation of the carbon dioxide sequestration effect of the different types of coal seam roofs, reduce the investment risk and provide a basis for on-site carbon dioxide coal seam sequestration.
The box adopts toughened glass to make, and toughened glass not only can bear certain pressure, can make things convenient for the staff to observe the inside coal seam of box and the condition of each layer coal seam roof moreover.
Drawings
FIG. 1 is a schematic diagram of the experimental system of the present invention.
Fig. 2 is a schematic structural diagram of a coal seam roof simulation system according to the present invention.
FIG. 3 is a graph of the distribution of rows of second pressure sensors of the present invention in the roof of each coal seam.
Detailed Description
The embodiments of the present invention are further described below with reference to the drawings.
As shown in fig. 1-3, a method for evaluating the effect of carbon dioxide sequestration of different types of coal seam roof comprises the following steps:
1. assembling an experimental system for evaluating the effect of carbon dioxide sequestration of different types of coal seam roofs, wherein the experimental system comprises a coal seam roof simulation system, a carbon dioxide injection system and a sequestration monitoring evaluation system;
2. manufacturing a coal seam roof 1 through a coal seam roof simulation system according to the type of the real coal seam roof, and simulating the real coal seam pressure;
3. injecting carbon dioxide into the coal bed through a carbon dioxide injection system until the design pressure is reached;
4. monitoring and recording the pressure of different positions of the coal seam roof 1 through a sealing monitoring and evaluating system, and evaluating the effect of sealing carbon dioxide in the coal seam roof 1 according to the recorded pressure data;
5. the type of the coal seam roof 1, the coal seam pressure and the carbon dioxide injection pressure are changed, different coal seam roof conditions are simulated, and then the carbon dioxide sequestration effect is evaluated through the sequestration monitoring evaluation system.
The coal bed roof simulation system comprises a box body 2, a temperature controller 3, a water tank 4 and a water injection pump 5, the box body 2 is made of toughened glass, the front side of the box body 2 is open, a toughened sliding door 6 is arranged on the front side opening of the box body 2 in a left-right sliding mode, an electric heating interlayer (not shown) is arranged on the inner wall of the box body 2, the temperature controller 3 is arranged outside the box body 2 and is in signal connection with the electric heating interlayer, a coal bed bottom plate 7 is sequentially paved inside the box body 2 from bottom to top, a coal bed 8 is arranged on the coal bed, three layers of different types of coal bed roofs 1, a steel plate 9 and a pressurizing bag 10 are arranged on the inner wall of the box body 2, the water tank 4 and the water injection pump 5 are both arranged outside the box body 2, the water outlet end of the water tank 4 is connected with the water inlet end of the water injection pump 5 through a water outlet pipe 11, the water outlet end of the water injection pump 5 is connected with a water injection pipe 12, the water outlet end of the water injection pipe 12 penetrates through the side plate upper side portion of the box body 2 and extends into the box body 2, and the water inlet end of the pressurizing bag 10 is connected with the water outlet end of the water injection pipe 12.
The carbon dioxide injection system comprises a carbon dioxide steel bottle 13, the top gas outlet end of the carbon dioxide steel bottle 13 is connected with a gas injection pipe 14, a gas injection valve 15, a carbon dioxide delivery pump 16 and a first pressure sensor 17 are sequentially arranged on the gas injection pipe 14 along the gas flowing direction, and the gas outlet end of the gas injection pipe 14 concentrically vertically penetrates through the top plate of the box body 2, the pressurizing bag 10 and the coal seam top plate 1 of each layer downwards and is inserted into the coal seam 8.
The sealing monitoring and evaluating system comprises a computer 18 and three rows of second pressure sensors 19, the second pressure sensors 19 in each row are correspondingly installed in the coal seam roof 1 at the upper and lower intervals respectively, the distances between the second pressure sensors 19 in each row and the top surface of the coal seam 8 are x, 3x and 5x respectively, each row of second pressure sensors 19 respectively comprises three second pressure sensors 19, the three second pressure sensors 19 are uniformly arranged in the corresponding coal seam roof 1 at equal intervals at the left and right, and the computer 18 is in signal connection with the first pressure sensors 17 and the second pressure sensors 19 respectively.
The step (II) is specifically as follows: opening a toughened sliding door 6, according to the type of a real coal seam roof, sequentially laying a coal seam floor 7, a coal seam 8, each layer of coal seam roof 1, a steel plate 9 and a pressurizing bag 10 in a box body 2 from bottom to top according to a similarity ratio, in the laying process, sequentially installing each row of second pressure sensors 19 in each layer of coal seam roof 1 at intervals up and down, vertically and downwards penetrating the air outlet end of an air injection pipe 14 through the roof of the box body 2, the pressurizing bag 10 and each layer of coal seam roof 1 to be inserted into the coal seam 8 in a concentric manner, closing the toughened sliding door 6, plugging a front side opening of the box body 2, then starting a water injection pump 5, injecting water in a water tank 4 into the pressurizing bag 10 through a water injection pipe 12 by the water injection pump 5, enabling the pressurizing bag 10 to apply pressure downwards, simulating the pressure of the real coal seam, and forming a complete experiment system.
The step (III) is specifically as follows: the gas injection valve 15 is opened, the carbon dioxide delivery pump 16 is started, the carbon dioxide delivery pump 16 injects the carbon dioxide gas in the carbon dioxide steel cylinder 13 into the coal seam 8 through the gas injection pipe 14, the pressure in the gas injection pipe 14 is monitored in real time through the first pressure sensor 17, when the pressure in the gas injection pipe 14 reaches the design pressure, the gas injection valve 15 and the carbon dioxide delivery pump 16 are closed, and the injection of the carbon dioxide is stopped.
The step (IV) is specifically as follows: the second pressure sensors 19 in each row respectively and correspondingly monitor the gas pressure in the coal seam roof 1 in each layer, and transmit the monitored pressure data to the computer 18, and if the pressure data monitored by the second pressure sensors 19 in the first row are X1, X2 and X3, the gas pressure in the coal seam roof 1 in the first layer is recorded as (X1 + X2+ X3)/3; the pressure data monitored by the second row of second pressure sensors 19 are X4, X5 and X6, and the gas pressure in the second layer of coal seam roof 1 is recorded as (X4 + X5+ X6)/3; if the pressure data monitored by the second pressure sensor 19 in the third row are X7, X8 and X9, the gas pressure in the roof 1 of the third layer of coal seam is recorded as (X7 + X8+ X9)/3; the gas pressure records in the coal seam roof 1 of each layer are monitored by the corresponding second pressure sensors 19 of each row, and the carbon dioxide sealing effect of the coal seam roof 1 is evaluated according to the recorded pressure data.
The invention can simulate real coal beds and different types of coal bed roofs, realizes the evaluation of the carbon dioxide sequestration effect of the different types of coal bed roofs, reduces the investment risk and provides a basis for on-site carbon dioxide coal bed sequestration.
The box body 2 is made of toughened glass, and the toughened glass can bear certain pressure and can be convenient for workers to observe the coal bed inside the box body and the coal bed roofs of all layers.
The temperature controller 3, the electric heating interlayer, the toughened sliding door 6, the water injection pump 5, the carbon dioxide delivery pump 16, the first pressure sensor 17 and the second pressure sensor 19 are conventional technologies, and specific structures and working principles are not repeated.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that; modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (7)
1. The evaluation method for the effect of carbon dioxide sequestration of different types of coal seam roofs is characterized by comprising the following steps of: the method comprises the following steps:
1. assembling an experimental system for evaluating the effect of carbon dioxide sequestration of different types of coal seam roofs, wherein the experimental system comprises a coal seam roof simulation system, a carbon dioxide injection system and a sequestration monitoring evaluation system;
2. manufacturing a coal seam roof through a coal seam roof simulation system according to the type of the real coal seam roof, and simulating the pressure of the real coal seam;
3. injecting carbon dioxide into the coal bed through a carbon dioxide injection system until the design pressure is reached;
4. monitoring and recording the pressure of different positions of the coal seam roof through a sealing monitoring and evaluating system, and evaluating the effect of sealing carbon dioxide in the coal seam roof according to the recorded pressure data;
5. the type of the coal seam roof, the coal seam pressure and the carbon dioxide injection pressure are changed, different coal seam roof conditions are simulated, and then the carbon dioxide sequestration effect is evaluated through the sequestration monitoring and evaluation system.
2. The method for evaluating the effect of carbon dioxide sequestration for different types of coal seam roof as claimed in claim 1, wherein: the coal bed roof simulation system comprises a box body, a temperature controller, a water tank and a water injection pump, the box body is made of toughened glass, the front side of the box body is open, the front side opening horizontal sliding of the box body is provided with a toughened sliding door, the inner wall of the box body is provided with an electric heating interlayer, the temperature controller is arranged outside the box body and is in signal connection with the electric heating interlayer, a coal bed bottom plate is sequentially laid in the box body from bottom to top, the coal bed, a plurality of layers of different types of coal bed roof plates, a steel plate and a pressurizing bag, the water tank and the water injection pump are arranged outside the box body, the water outlet end of the water tank is connected with the water inlet end of the water injection pump through a water outlet pipe, the water outlet end of the water injection pipe penetrates through the upper side part of the side plate of the box body and extends into the box body, and the water outlet end of the water injection pipe is connected with the water inlet end of the pressurizing bag.
3. The method for evaluating the effect of carbon dioxide sequestration for different types of coal seam roof as claimed in claim 2, wherein: the carbon dioxide injection system comprises a carbon dioxide steel cylinder, wherein the top gas outlet end of the carbon dioxide steel cylinder is connected with a gas injection pipe, a gas injection valve, a carbon dioxide delivery pump and a first pressure sensor are sequentially arranged on the gas injection pipe along the gas flowing direction, and the gas outlet end of the gas injection pipe concentrically vertically penetrates through a top plate, a pressurizing bag and each layer of coal seam top plate of the box body downwards and is inserted into the coal seam.
4. The method for evaluating the effect of the carbon dioxide sequestered in the different types of coal seam roofs according to claim 3, wherein: the sealing monitoring and evaluating system comprises a computer and a plurality of rows of second pressure sensors, the second pressure sensors in each row are correspondingly installed in the top plate of each layer at an upper-lower interval, the distances between the second pressure sensors in each row and the top surface of the coal bed are x, 3x and 5x respectively, each row of second pressure sensors comprises three second pressure sensors, the three second pressure sensors are uniformly arranged in the corresponding coal bed top plate at equal intervals at the left and right, and the computer is in signal connection with the first pressure sensors and the second pressure sensors respectively.
5. The method for evaluating the effect of carbon dioxide sequestration for different types of coal seam roof as claimed in claim 4, wherein: the step (II) is specifically as follows: open the tempering push-and-pull door, according to true coal seam roof type, according to the similarity ratio, with the coal seam bottom plate, the coal seam, each layer coal seam roof, steel sheet and pressurization bag are laid in proper order in the box from bottom to top, at the in-process of laying, install each row of second pressure sensor in each layer different grade type coal seam roof in proper order from top to bottom at the interval, pass the roof of box with the end of giving vent to anger of gas injection pipe concentric vertical downwards again, pressurization bag and each layer coal seam roof insert in the coal seam, close the tempering push-and-pull door again, with the front side mouth shutoff of box, then start the water injection pump, the water in the water injection pump passes through the water injection pipe and pours into the pressurization bag into, make the pressurization bag exert pressure downwards, simulate true coal seam pressure, constitute complete experimental system.
6. The method for evaluating the effect of carbon dioxide sequestration for different types of coal seam roof as claimed in claim 5, wherein: the step (III) is specifically as follows: the gas injection valve is opened, the carbon dioxide delivery pump is started, the carbon dioxide gas in the carbon dioxide steel cylinder is injected into the coal bed through the gas injection pipe by the carbon dioxide delivery pump, the pressure in the gas injection pipe is monitored in real time through the first pressure sensor, when the pressure in the gas injection pipe reaches the design pressure, the gas injection valve and the carbon dioxide delivery pump are closed, and the injection of the carbon dioxide is stopped.
7. The method for evaluating the effect of carbon dioxide sequestration for different types of coal seam roof as claimed in claim 6, wherein: the step (IV) is specifically as follows: the second pressure sensors in each row respectively and correspondingly monitor the gas pressure in the coal seam roof of each layer, and transmit the monitored pressure data to the computer, and if the pressure data monitored by the second pressure sensors in the first row are X1, X2 and X3, the gas pressure in the coal seam roof of the first layer is recorded as (X1 + X2+ X3)/3; the pressure data monitored by the second row of second pressure sensors are X4, X5 and X6, and the gas pressure in the roof of the second layer of coal seam is recorded as (X4 + X5+ X6)/3; the pressure data monitored by the second pressure sensor in the third row are X7, X8 and X9, and then the gas pressure in the top plate of the third layer of coal seam is recorded as (X7 + X8+ X9)/3; the gas pressure record in each layer of coal seam roof is obtained through monitoring of corresponding second pressure sensors in each row, and the carbon dioxide sealing effect of the coal seam roof is evaluated according to the recorded pressure data.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116990189A (en) * | 2023-09-28 | 2023-11-03 | 西南石油大学 | Coal bed carbon sequestration potential evaluation test method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116990189A (en) * | 2023-09-28 | 2023-11-03 | 西南石油大学 | Coal bed carbon sequestration potential evaluation test method and system |
| CN116990189B (en) * | 2023-09-28 | 2023-12-05 | 西南石油大学 | Coal bed carbon sequestration potential evaluation test method and system |
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