CO2 storage and gas recovery device for adapting to compact gas horizontal well

Abstract

The application discloses a CO2 storage and gas production coordination device suitable for compact gas horizontal wells and relates to the technical field of gas production and carbon storage coordination. The device comprises a reservoir state sensing module, an intelligent analysis and regulation module, a CO2 injection regulation module, a pressure balance module and a gas production execution module. The reservoir stress, concentration and pressure multidimensional data are synchronously collected through the reservoir state sensing module, and the problem of single parameter regulation of the existing device and the problem of not considering the stress sensitivity of the compact gas reservoir are solved in combination with the multi-field coupling model of the intelligent analysis and regulation module. The injection point is accurately adjusted through the CO2 injection regulation module, CO2 channeling along the high stress crack is avoided, the reservoir pressure is coordinately adjusted through the pressure balance module and the gas production execution module, the problem of reservoir pressure imbalance is solved, the synchronous improvement of the compact gas horizontal well gas production efficiency and the CO2 storage safety is finally realized, and the stable achievement of the energy development and carbon emission reduction coordination target is ensured.

Description

Technical Field

[0001] This invention relates to the field of gas production and carbon sequestration synergy technology, specifically to a CO2 sequestration and gas production synergy device adapted to tight gas horizontal wells. Background Technology

[0002] Horizontal wells for tight gas are special well types developed for tight gas reservoirs. Tight gas reservoirs are characterized by low porosity and low permeability, making conventional vertical wells difficult and inefficient to extract. Horizontal wells, by extending the contact length between the wellbore and the reservoir, can significantly improve the extraction efficiency of tight gas. This is an important extraction method to ensure a stable supply of natural gas and alleviate the contradiction between energy supply and demand, and it is of great significance for promoting the diversification of energy structure and ensuring energy security. CO2 sequestration and production involves injecting CO2 into underground reservoirs, utilizing the displacement effect of CO2 to improve oil and gas recovery, while permanently sequestering CO2 in the reservoir, achieving a synergy between resource development and carbon emission reduction. This technology can improve the recovery efficiency of oil and gas resources, increase energy supply, and effectively reduce CO2 emissions into the atmosphere, mitigating global warming. It is a key technological path that balances energy production and ecological environmental protection, and has significant economic value and environmental significance.

[0003] However, existing CO2 storage and production equipment has certain shortcomings when adapted to tight gas horizontal wells. Tight gas reservoirs are highly stress-sensitive, and changes in reservoir stress can easily lead to changes in pore structure and deformation of seepage channels. Existing equipment mostly relies on a single parameter of pressure or concentration for regulation, without considering the coupling effect between stress, concentration, and seepage. This results in low regulation accuracy, and single-parameter regulation cannot respond in a timely manner to reservoir stress anomalies and CO2 migration changes. Problems such as CO2 channeling along high-stress fractures and reservoir pressure imbalance can easily occur, affecting gas production efficiency and CO2 storage safety. Furthermore, the lack of an integrated perception and regulation mechanism for tight gas reservoir characteristics makes it difficult to achieve real-time monitoring of reservoir status and precise matching of regulation actions, thus limiting the overall effectiveness of collaborative operations. Therefore, developing a CO2 storage and production collaborative device adapted to tight gas horizontal wells is of great significance. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a CO2 storage and gas production coordination device adapted to tight gas horizontal wells. It can realize the synchronous acquisition of multi-dimensional data such as reservoir stress, concentration, and pressure through the reservoir state sensing module. Combined with the multi-field coupling model of the intelligent analysis and control module, it solves the problem of single parameter control and failure to consider the stress sensitivity of tight gas reservoirs. The CO2 injection control module precisely adjusts the injection point to avoid CO2 flow along high-stress fractures. The pressure balance module and the gas production execution module work together to regulate the reservoir pressure to solve the reservoir pressure imbalance problem, thereby achieving a simultaneous improvement in the gas production efficiency and CO2 storage safety of tight gas horizontal wells.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a CO2 storage and gas production coordination device adapted to tight gas horizontal wells, the device comprising: a reservoir state sensing module, an intelligent analysis and control module, a CO2 injection control module, a pressure balance module, and a gas production execution module;

[0006] The reservoir condition sensing module is arranged along the horizontal wellbore and key reservoir areas to collect reservoir temperature, strain, pressure and CO2 concentration data.

[0007] The intelligent analysis and control module establishes signal connections with the reservoir state sensing module, CO2 injection control module, pressure balance module and gas production execution module respectively. The intelligent analysis and control module has a built-in stress-concentration-seepage multi-field coupling model, which is used to receive data transmitted by the reservoir state sensing module, analyze it and generate control commands.

[0008] The CO2 injection control module is installed on the CO2 injection channel and is used to adjust the CO2 injection point and injection status according to the instructions of the intelligent analysis and control module.

[0009] The pressure balancing module is arranged in sections along the horizontal well and is used to release pressure in the high-stress area of ​​the reservoir according to the instructions of the intelligent analysis and control module.

[0010] The gas production execution module is connected to the horizontal well gas production channel and is used to adjust the gas production rate according to the instructions of the intelligent analysis and control module.

[0011] Furthermore, the reservoir state sensing module includes a distributed optical fiber sensing unit and a multi-parameter monitoring unit, and the reservoir state sensing module includes the following steps when collecting reservoir data:

[0012] Distributed fiber optic sensing units are laid along the horizontal wellbore and key areas of the reservoir. At the same time, pressure sensors and gas concentration sensors from the multi-parameter monitoring unit are installed in different permeable areas of the reservoir and gas production channels.

[0013] Start the distributed fiber optic sensing unit to collect reservoir temperature and strain data;

[0014] The multi-parameter monitoring unit is activated simultaneously. It collects reservoir pressure data through pressure sensors and CO2 concentration data in the reservoir and gas production channel through gas concentration sensors. All collected data are transmitted to the intelligent analysis and control module in real time.

[0015] Furthermore, the distributed optical fiber sensing unit uses armored optical fiber, the outer layer of which is wrapped with an anti-corrosion and wear-resistant coating. The armored optical fiber is laid at intervals along the circumferential inner wall of the horizontal well, and is densely laid in areas where the reservoir permeability difference is greater than a preset value.

[0016] Furthermore, both the pressure sensor and the gas concentration sensor in the multi-parameter monitoring unit adopt a waterproof and sealed structure. The detection end of the pressure sensor is set towards the reservoir pore direction, and the sampling port of the gas concentration sensor is connected to the reservoir through a filter screen. The pore size of the filter screen is smaller than the average pore size of the reservoir pores.

[0017] Furthermore, the intelligent analysis and control module includes a data receiving unit, a model calculation unit, and an instruction generation unit, and the intelligent analysis and control module, when processing data and generating control instructions, includes the following steps:

[0018] The data receiving unit receives temperature, strain, pressure, and CO2 concentration data transmitted by the reservoir condition sensing module.

[0019] The received data is input into the model calculation unit, where the measured values ​​of reservoir strain are first extracted. Actual pressure value Measured CO2 concentration Then retrieve the preset reservoir stability strain value. reservoir original pressure CO2 safe concentration threshold The reservoir comprehensive condition assessment index was calculated using a stress-concentration-seepage multi-field coupling model. The calculation formula is:

[0020] ,

[0021] in, For strain deviation, For pressure deviation, For CO2 concentration deviation, , , These are the weighting coefficients for strain, pressure, and CO2 concentration in reservoir condition assessment, respectively. , , Stress-strain relationship data under different confining pressures were obtained through triaxial compression experiments on reservoir cores. Combined with historical CO2 sequestration and gas production data from at least three similar tight gas horizontal wells in the field, partial least squares regression was used to fit and determine the coefficients, ensuring that each coefficient matches the actual response characteristics of the reservoir. Finally, the comprehensive reservoir condition assessment index was used. The magnitude of the values ​​indicates the reservoir stress stability, CO2 migration trend, and pressure balance state.

[0022] Based on the analysis results of the model calculation unit, the instruction generation unit generates control instructions for the corresponding CO2 injection control module, pressure balance module, and gas extraction execution module, respectively.

[0023] The generated control commands are transmitted to the corresponding CO2 injection control module, pressure balance module, and gas extraction execution module, respectively.

[0024] Furthermore, when performing computational analysis, the model computational unit will calculate the reservoir comprehensive state assessment index. Compared with the preset state threshold, when the reservoir comprehensive state assessment index When the value is less than a preset threshold, the reservoir is determined to be in a stable state. When the reservoir comprehensive state assessment index... If the value is greater than or equal to a preset threshold, the reservoir is determined to be in an abnormal state, and further analysis is performed based on strain deviation. Pressure deviation CO2 concentration deviation The parameter with the largest median value is used to determine the dominant factor in the anomaly.

[0025] Furthermore, the CO2 injection control module includes a main injection pipeline, branch injection pipelines, and an injection control valve assembly, and the CO2 injection control module includes the following steps when adjusting the CO2 injection point and injection state:

[0026] Receive control commands transmitted by the intelligent analysis and control module, and determine the injection point to be adjusted and the corresponding injection parameters;

[0027] Based on the determined injection point, locate the corresponding branch injection pipe and the control valve on that branch injection pipe;

[0028] By controlling the opening degree of the corresponding control valve, the CO2 flow rate in the branch injection pipeline is adjusted to achieve the adjustment of the injection state;

[0029] When it is necessary to switch injection points, close the control valve of the current branch injection pipeline and open the control valve of the target branch injection pipeline to complete the injection point switch.

[0030] Furthermore, the pressure balancing module includes a pressure relief pipeline and a pressure relief valve assembly. The pressure relief pipeline is segmented along the length of the horizontal well, with each segment corresponding to a specific stress region in the reservoir. One end of each pressure relief pipeline extends to the corresponding region in the reservoir, and the other end is connected to an external pressure relief system. The pressure relief valve assembly includes multiple pressure relief valves, each of which is installed on a corresponding segment of the pressure relief pipeline. Each pressure relief valve is connected to the intelligent analysis and control module for signal control of the opening, closing, and pressure relief rate of the corresponding pressure relief pipeline according to control commands.

[0031] Furthermore, the gas production execution module includes a gas production pipeline, a gas production regulating valve, and a flow monitoring component. The gas production pipeline is connected to the gas production channel of the horizontal well and is used to transport the extracted tight gas. The gas production regulating valve is installed on the gas production pipeline and is connected to the intelligent analysis and control module for signal connection. It is used to adjust the flow cross-sectional area of ​​the gas production pipeline according to the control command, thereby adjusting the gas production rate. The flow monitoring component is installed on the gas production pipeline and located downstream of the gas production regulating valve. It is used to monitor the gas flow rate in the gas production pipeline and transmit the flow data to the intelligent analysis and control module.

[0032] Compared with existing technologies, this CO2 storage and gas production co-production device adapted for tight gas horizontal wells has the following advantages:

[0033] This invention achieves simultaneous acquisition of multi-dimensional data on reservoir stress, concentration, and pressure through a reservoir state sensing module. Combined with a multi-field coupling model of an intelligent analysis and control module, it solves the problems of single-parameter control in existing devices and failure to consider the stress sensitivity of tight gas reservoirs. The CO2 injection control module precisely adjusts the injection point to prevent CO2 from flowing along high-stress fractures. The pressure balance module and the gas production execution module work together to regulate reservoir pressure, solving the problem of reservoir pressure imbalance. Ultimately, this invention achieves simultaneous improvement in gas production efficiency and CO2 storage safety in tight gas horizontal wells, ensuring the stable achievement of the goals of energy development and carbon emission reduction.

[0034] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0036] Figure 1 A schematic diagram of a CO2 storage and gas production co-production device adapted to tight gas horizontal wells;

[0037] Figure 2 A flowchart of the CO2 storage and gas production co-production device adapted to tight gas horizontal wells. Detailed Implementation

[0038] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0039] The present invention provides a CO2 storage and gas production co-production device adapted to tight gas horizontal wells, which aims to solve the problems of single parameter control and failure to consider the stress sensitivity of tight gas reservoirs in existing devices, and to achieve simultaneous improvement in gas production efficiency and CO2 storage safety.

[0040] The device consists of a reservoir state sensing module, an intelligent analysis and control module, a CO2 injection control module, a pressure balance module, and a gas production execution module. These modules work together to form a complete technical solution. (See [link to documentation]). Figure 1 and Figure 2 The specific details are as follows:

[0041] The reservoir condition sensing module is arranged along the horizontal wellbore and key reservoir areas, comprising a distributed fiber optic sensing unit and a multi-parameter monitoring unit. The distributed fiber optic sensing unit uses armored optical fibers with an anti-corrosion and wear-resistant coating, laid at intervals along the circumferential wall of the wellbore, with denser placement in areas of significant reservoir permeability differences, for collecting temperature and strain data. The pressure sensor and gas concentration sensor of the multi-parameter monitoring unit are both waterproof and sealed, installed in different permeable areas of the reservoir and within the gas production channel. The pressure sensor's detection end faces the reservoir pores, while the gas concentration sensor communicates with the reservoir through a filter screen smaller than the average pore size, simultaneously collecting pressure and CO2 concentration data and transmitting all data in real time.

[0042] The intelligent analysis and control module establishes signal connections with the other four modules and incorporates a stress-concentration-seepage multi-field coupling model, including data receiving, model calculation, and command generation units. After receiving data from the reservoir state sensing module, it extracts measured values ​​and retrieves preset standard values. Through the multi-field coupling model, it calculates the comprehensive reservoir state assessment index, compares it with preset thresholds to determine reservoir stability, and if an anomaly is detected, it identifies the dominant factor based on the maximum deviation parameter, thereby generating corresponding control commands.

[0043] The CO2 injection control module is installed in the CO2 injection channel and consists of a main injection pipeline, branch injection pipelines, and an injection control valve group. It determines the adjusted injection point and parameters according to the instructions, adjusts the flow rate by controlling the opening degree of the control valve, or changes the injection point by switching the branch pipeline.

[0044] The pressure balancing module is arranged in sections along the horizontal well, including pressure relief pipes and pressure relief valve groups. Each section of pressure relief pipe corresponds to a specific stress area. The opening, closing and pressure relief rate of the pipes are controlled by the pressure relief valves to release the pressure in the high stress area.

[0045] The gas extraction execution module is connected to the gas extraction channel and consists of a gas extraction pipeline, a gas extraction regulating valve, and a flow monitoring component. The gas extraction regulating valve adjusts the cross-sectional area of ​​the pipeline according to the command to change the gas extraction rate, and the flow monitoring component monitors the flow rate in real time and feeds back the data.

[0046] Example 1: This example is applied to a horizontal well development project in a tight gas field. The reservoir in this gas field has low porosity and low permeability characteristics, and is highly stress-sensitive. Conventional CO2 storage and production devices are prone to CO2 channeling and reservoir pressure imbalance, leading to decreased production efficiency and reduced storage safety. Therefore, this invention utilizes a CO2 storage and production co-production device adapted for tight gas horizontal wells. (See attached image.) Figure 1 and Figure 2 Through the collaborative work of multiple modules, real-time monitoring and precise control of reservoir status can be achieved, thereby realizing the goal of synergistic optimization of gas production and carbon sequestration.

[0047] During the equipment deployment phase, the reservoir condition sensing module is installed first. Armored optical fibers are laid at intervals along the circumferential inner wall of the horizontal wellbore. These fibers are coated with an anti-corrosion and wear-resistant layer. In areas where the reservoir permeability difference exceeds a preset value, the fibers are laid more densely to form a distributed optical fiber sensing unit for collecting reservoir temperature and strain data. Simultaneously, pressure sensors are installed in different permeability zones of the reservoir, and gas concentration sensors are installed in the gas production channel, forming a multi-parameter monitoring unit. Both the pressure and gas concentration sensors employ waterproof and sealed structures. The pressure sensor's detection end faces the reservoir pores, while the gas concentration sensor's sampling port is connected to the reservoir through a filter screen. The filter screen's pore size is smaller than the average pore size of the reservoir, ensuring accurate data acquisition and stable equipment operation.

[0048] After the device is started, the reservoir condition sensing module begins to work. The distributed fiber optic sensing unit starts up and continuously collects reservoir temperature and strain data; the multi-parameter monitoring unit starts up simultaneously, the pressure sensor collects reservoir pressure data in real time, and the gas concentration sensor collects CO2 concentration data in the reservoir and gas production channel. All the collected data is transmitted to the intelligent analysis and control module in real time through the signal transmission line.

[0049] After receiving the data, the intelligent analysis and control module uses a data receiving unit to receive and preprocess the temperature, strain, pressure, and CO2 concentration data. The data is then input into the model calculation unit. In this embodiment, the measured reservoir strain values ​​are first extracted from the data. Actual pressure value Measured CO2 concentration Then retrieve the preset reservoir stability strain value. reservoir original pressure CO2 safe concentration threshold .

[0050] Based on the stress-concentration-seepage multi-field coupling model, the reservoir comprehensive condition assessment index is calculated. The calculation formula is:

[0051] ,

[0052] in, For strain deviation, For pressure deviation, For CO2 concentration deviation, , , These are the weighting coefficients for strain, pressure, and CO2 concentration in reservoir condition assessment. These coefficients are determined by obtaining stress-strain relationship data under different confining pressures through triaxial compression experiments of reservoir cores, combined with historical CO2 sequestration and gas production data from multiple similar tight gas horizontal wells in the field, and fitted using a partial least squares regression algorithm.

[0053] The model calculation unit will calculate the reservoir comprehensive condition assessment index. Compared with the preset state threshold, if the reservoir comprehensive state assessment index If the reservoir's overall state assessment index is below a preset threshold, it is determined to be in a stable state, and the current operating parameters of each module are maintained; if the overall state assessment index of the reservoir .... If the value is greater than or equal to a preset threshold, the reservoir is determined to be in an abnormal state, and further analysis is performed based on strain deviation. Pressure deviation CO2 concentration deviation The parameter with the largest median value is used to determine the dominant factor in the anomaly.

[0054] The instruction generation unit generates control instructions based on the analysis results of the model calculation unit. When the dominant abnormal factor is excessive strain deviation, a control instruction is generated for the pressure balance module; when the dominant abnormal factor is excessive pressure deviation, control instructions are simultaneously generated for both the pressure balance module and the gas extraction execution module; when the dominant abnormal factor is excessive CO2 concentration deviation, a control instruction is generated for the CO2 injection control module, and the generated control instructions are transmitted to the corresponding modules respectively.

[0055] After receiving the instruction, the CO2 injection control module determines the injection point to be adjusted and the corresponding injection parameters, locates the branch injection pipeline and the control valve on the pipeline corresponding to the injection point, and adjusts the CO2 flow rate in the branch injection pipeline by controlling the opening degree of the control valve to achieve injection status adjustment; if it is necessary to switch the injection point, the control valve of the current branch injection pipeline is closed, and the control valve of the target branch injection pipeline is opened at the same time to complete the injection point switching.

[0056] After receiving the instruction, the pressure balancing module determines the high-stress area that needs to be depressurized, controls the pressure relief valve on the corresponding pressure relief pipeline, adjusts the opening degree of the pressure relief valve to control the pressure relief rate, releases the pressure in the high-stress area of ​​the reservoir, until the reservoir stress returns to a stable range.

[0057] After receiving the command, the gas production execution module adjusts the flow cross-sectional area of ​​the gas production pipeline through the gas production regulating valve, thereby adjusting the gas production rate. At the same time, the flow monitoring component monitors the gas flow rate in the gas production pipeline in real time and transmits the flow data to the intelligent analysis and control module to form a closed-loop control, ensuring that the gas production rate matches the reservoir condition.

[0058] Throughout the implementation process, the intelligent analysis and control module continuously receives data transmitted from the reservoir state sensing module, repeatedly performing the aforementioned analysis and control process until the comprehensive reservoir state assessment index is reached. When the temperature drops below the preset threshold, the reservoir returns to a stable state, and then maintains the current operating parameters of each module to achieve continuous and stable CO2 storage and tight gas extraction operations.

[0059] In summary, this embodiment effectively solves the problems of single-parameter control and lack of consideration for the stress sensitivity of tight gas reservoirs in existing devices through the coordinated work of various modules. The reservoir state sensing module realizes multi-dimensional data synchronous acquisition, providing accurate data support for control; the intelligent analysis and control module accurately judges the reservoir state through a multi-field coupling model, ensuring accurate control direction; the CO2 injection control module avoids CO2 channeling along high-stress fractures; and the pressure balance module and gas production execution module work together to solve the reservoir pressure imbalance problem. Ultimately, this achieves a simultaneous improvement in the gas production efficiency and CO2 sequestration safety of tight gas horizontal wells, ensuring the stable achievement of the coordinated goals of energy development and carbon emission reduction, and providing a reliable technical solution for CO2 sequestration and gas production operations in similar tight gas fields.

[0060] Example 2: This example is applied to a tight gas horizontal well block containing complex natural fractures. Besides low porosity and low permeability, the reservoir in this block exhibits complex CO2 channeling due to well-developed natural fractures, and uneven stress distribution in the fracture areas. Conventional equipment is prone to storage failure due to disordered CO2 migration along the fractures. Simultaneously, the reservoir pressure fluctuates significantly, resulting in poor gas production stability. Based on this, and building upon the device described in Example 1, the module deployment and control logic are optimized for the characteristics of complex fractured reservoirs. Through multi-module collaboration, a dynamic balance between precise CO2 storage and efficient tight gas extraction is achieved. (See [link to example 1]). Figure 1 and Figure 2 The specific details are as follows:

[0061] During the device deployment phase, the deployment scheme was optimized based on the reservoir state sensing module of Example 1. In addition to the distributed optical fiber sensing units being laid at intervals along the circumferential inner wall of the horizontal wellbore, armored optical fibers were additionally laid along the fracture direction in the known natural fracture development zones, and further densified in the fracture intersection areas to ensure comprehensive capture of temperature and strain changes in the fracture area. In the multi-parameter monitoring unit, the deployment density of pressure sensors and gas concentration sensors in the reservoir near the fractures was increased, and a gas concentration sensor was added on the side of the gas production channel near the fracture to monitor in real time whether CO2 enters the gas production channel through the fractures. All sensors maintained a waterproof and sealed structure, and the filter screen aperture of the gas concentration sensor sampling port was kept smaller than the average pore size of the reservoir.

[0062] After the device is started, the reservoir condition sensing module operates according to the optimized deployment scheme. The distributed optical fiber sensing unit synchronously collects temperature and strain data in the wellbore and fracture area, and the multi-parameter monitoring unit collects reservoir pressure and CO2 concentration data in different areas. All data are transmitted to the intelligent analysis and control module in real time.

[0063] After receiving the data, the intelligent analysis and control module performs data preprocessing. In this embodiment, the model calculation unit extracts the measured values ​​of reservoir strain. Actual pressure value Measured CO2 concentration Retrieve preset reservoir stability strain values reservoir original pressure CO2 safe concentration threshold .

[0064] Calculate the reservoir comprehensive condition assessment index based on the stress-concentration-seepage multi-field coupling model. The calculation formula is:

[0065] ,

[0066] in , , , , , The determination method is the same as in Example 1, but during model calculation, strain and pressure data in the fracture region are given higher weights to prioritize the determination of whether the reservoir state in the fracture region is abnormal. When the reservoir comprehensive state assessment index... When the value is greater than or equal to the preset threshold, in addition to determining the dominant factor of the anomaly, the strain data of the crack area captured by the distributed optical fiber sensing unit is further combined to locate whether the anomaly originates from the crack area.

[0067] The command generation unit generates targeted control commands based on the analysis results. If the dominant abnormal factor is an excessively large CO2 concentration deviation located in the fracture area, a command to adjust the CO2 injection control module is generated, prioritizing the closure of branch injection pipelines near the abnormal fracture area. If the dominant abnormal factor is an excessively large strain deviation originating from high stress in the fracture area, a control command to the pressure balance module is generated, opening the corresponding pressure relief pipeline near the fracture. If the dominant abnormal factor is an excessively large pressure deviation, control commands to the pressure balance module and the gas production execution module are generated simultaneously to adjust the pressure relief rate and the gas production rate.

[0068] After receiving the command, the CO2 injection control module adjusts the injection point and injection flow rate as in Example 1. In response to abnormal conditions in the fracture area, if it is necessary to close the branch injection pipes near the fracture, it simultaneously opens the branch injection pipes in areas far from the fracture and with stable reservoir conditions to prevent continuous CO2 injection into the fracture area. After receiving the command, the pressure balance module controls the pressure relief valve of the corresponding pressure relief pipe to open slowly in response to high stress conditions in the fracture area, preventing excessively rapid pressure relief from causing further fracture expansion. After receiving the command, the gas production execution module adjusts the gas production rate through the gas production regulating valve, and the flow monitoring component provides real-time feedback of flow data, forming a closed-loop control. If CO2 is detected entering the gas production channel through the fracture, the gas production rate is appropriately reduced to buy time for the pressure balance module to adjust the reservoir pressure.

[0069] Throughout the implementation process, the intelligent analysis and control module continuously tracks reservoir data in the fractured area, and when the reservoir comprehensive status assessment index... Once the stress levels drop below the preset threshold and the strain, pressure, and CO2 concentration in the fractured region stabilize, the current control parameters are maintained to achieve stable operation in complex fractured reservoirs.

[0070] In summary, this embodiment, by optimizing the deployment scheme of the reservoir state sensing module and adjusting the operational logic of the intelligent analysis and control module, specifically addresses the problems of CO2 channeling and pressure imbalance in complex fractured reservoirs. Compared to Embodiment 1, it more accurately captures reservoir changes in fractured areas, and the control commands are more aligned with the characteristics of complex fractured reservoirs. This effectively avoids CO2 channeling along natural fractures that could lead to storage failure, while simultaneously stabilizing reservoir pressure and ensuring gas production efficiency. It provides a more adaptable technical solution for CO2 storage and production operations in tight gas horizontal wells containing complex natural fractures, further expanding the application scope of the device of this invention.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A CO2 storage and gas production co-production device adapted to tight gas horizontal wells, characterized in that, The device includes: a reservoir state sensing module, an intelligent analysis and control module, a CO2 injection control module, a pressure balance module, and a gas production execution module; The reservoir condition sensing module is arranged along the horizontal wellbore and key reservoir areas to collect reservoir temperature, strain, pressure and CO2 concentration data. The intelligent analysis and control module establishes signal connections with the reservoir state sensing module, CO2 injection control module, pressure balance module, and gas production execution module, respectively. The intelligent analysis and control module has a built-in stress-concentration-seepage multi-field coupling model. It is used to receive and analyze data transmitted by the reservoir state sensing module and generate control commands. The CO2 injection control module is installed on the CO2 injection channel and is used to adjust the CO2 injection point and injection status according to the instructions of the intelligent analysis and control module. The pressure balancing module is arranged in sections along the horizontal well and is used to release pressure in the high-stress area of ​​the reservoir according to the instructions of the intelligent analysis and control module. The gas production execution module is connected to the horizontal well gas production channel and is used to adjust the gas production rate according to the instructions of the intelligent analysis and control module. The pressure balancing module includes a pressure relief pipeline and a pressure relief valve assembly. The pressure relief pipeline is segmented along the length of the horizontal well, with each segment corresponding to a specific stress region in the reservoir. One end of each pressure relief pipeline extends to the corresponding region in the reservoir, and the other end is connected to an external pressure relief system. The pressure relief valve assembly includes multiple pressure relief valves, each of which is installed on a corresponding segment of the pressure relief pipeline. Each pressure relief valve is connected to the intelligent analysis and control module for signal control of the opening, closing, and pressure relief rate of the corresponding pressure relief pipeline according to control commands.

2. The CO2 storage and gas production co-production device adapted for tight gas horizontal wells according to claim 1, characterized in that, The reservoir state sensing module includes a distributed optical fiber sensing unit and a multi-parameter monitoring unit, and the reservoir state sensing module includes the following steps when collecting reservoir data: Distributed fiber optic sensing units are laid along the horizontal wellbore and key areas of the reservoir. At the same time, pressure sensors and gas concentration sensors from the multi-parameter monitoring unit are installed in different permeable areas of the reservoir and gas production channels. Start the distributed fiber optic sensing unit to collect reservoir temperature and strain data; The multi-parameter monitoring unit is activated simultaneously. It collects reservoir pressure data through pressure sensors and CO2 concentration data in the reservoir and gas production channel through gas concentration sensors. All collected data are transmitted to the intelligent analysis and control module in real time.

3. The CO2 storage and gas production co-production device adapted for tight gas horizontal wells according to claim 2, characterized in that, The distributed optical fiber sensing unit uses armored optical fiber, the outer layer of which is wrapped with an anti-corrosion and wear-resistant coating. The armored optical fiber is laid at intervals along the circumferential inner wall of the horizontal well, and is densely laid in areas where the reservoir permeability difference is greater than a preset value.

4. The CO2 storage and gas production co-production device adapted for tight gas horizontal wells according to claim 2, characterized in that, Both the pressure sensor and the gas concentration sensor in the multi-parameter monitoring unit adopt a waterproof and sealed structure. The detection end of the pressure sensor is set towards the reservoir pore direction, and the sampling port of the gas concentration sensor is connected to the reservoir through a filter screen. The pore size of the filter screen is smaller than the average pore size of the reservoir.

5. The CO2 storage and gas production co-production device adapted for tight gas horizontal wells according to claim 1, characterized in that, The intelligent analysis and control module includes a data receiving unit, a model calculation unit, and an instruction generation unit. When processing data and generating control instructions, the intelligent analysis and control module includes the following steps: The data receiving unit receives temperature, strain, pressure, and CO2 concentration data transmitted by the reservoir condition sensing module. The received data is input into the model calculation unit. First, the measured values ​​of reservoir strain, pressure, and CO2 concentration are extracted. Then, the preset reservoir stable strain value, reservoir original pressure, and CO2 safe concentration threshold are retrieved. The reservoir comprehensive state assessment index is calculated through the stress-concentration-seepage multi-field coupling model. Finally, the reservoir stress stability, CO2 migration trend, and pressure balance state are judged based on the magnitude of the reservoir comprehensive state assessment index. Based on the analysis results of the model calculation unit, the instruction generation unit generates control instructions for the corresponding CO2 injection control module, pressure balance module, and gas extraction execution module, respectively. The generated control commands are transmitted to the corresponding CO2 injection control module, pressure balance module, and gas extraction execution module, respectively.

6. The CO2 storage and gas production co-production device adapted for tight gas horizontal wells according to claim 5, characterized in that, When performing calculations and analysis, the model calculation unit compares the calculated reservoir comprehensive state assessment index with a preset state threshold. When the reservoir comprehensive state assessment index is less than the preset threshold, the reservoir is determined to be in a stable state. When the reservoir comprehensive state assessment index is greater than or equal to the preset threshold, the reservoir is determined to be in an abnormal state. Furthermore, the dominant abnormal factor is determined based on the parameter with the largest value among strain deviation, pressure deviation, and CO2 concentration deviation.

7. The CO2 storage and gas production co-production device adapted for tight gas horizontal wells according to claim 1, characterized in that, The CO2 injection control module includes a main injection pipeline, branch injection pipelines, and an injection control valve assembly. When adjusting the CO2 injection point and injection status, the CO2 injection control module includes the following steps: Receive control commands transmitted by the intelligent analysis and control module, and determine the injection point to be adjusted and the corresponding injection parameters; Based on the determined injection point, locate the corresponding branch injection pipe and the control valve on that branch injection pipe; By controlling the opening degree of the corresponding control valve, the CO2 flow rate in the branch injection pipeline is adjusted to achieve the adjustment of the injection state; When it is necessary to switch injection points, close the control valve of the current branch injection pipeline and open the control valve of the target branch injection pipeline to complete the injection point switch.

8. The CO2 storage and gas production co-production device adapted for tight gas horizontal wells according to claim 1, characterized in that, The gas production execution module includes a gas production pipeline, a gas production regulating valve, and a flow monitoring component. The gas production pipeline is connected to the gas production channel of the horizontal well and is used to transport the extracted tight gas. The gas production regulating valve is installed on the gas production pipeline and is connected to the intelligent analysis and control module for signal connection. It is used to adjust the flow cross-sectional area of ​​the gas production pipeline according to the control command, thereby adjusting the gas production rate. The flow monitoring component is installed on the gas production pipeline and located downstream of the gas production regulating valve. It is used to monitor the gas flow rate in the gas production pipeline and transmit the flow data to the intelligent analysis and control module.

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