An intelligent water injection well control system and method with anti-backflow function

Abstract

The application discloses a kind of intelligent injection well control systems and methods with anti-backout function, it is related to oilfield water injection development technical field, the application includes: data acquisition module, data analysis module, data processing module and local database, through wired pressure transmitter accurate collection injection well dry pressure, oil pressure data, constructs pressure monitoring data set by data correlation, realizes the quick determination and automatic protection of backout risk by pressure value comparison, and continuously monitors pressure change, by difference calculation and analysis backout risk removal condition and restore normal injection, whole system relies on remote terminal unit RTU and realizes integrated intelligent control, pressure monitoring hardware type, range and preset recovery threshold value etc. can be flexibly configured as needed, can accurately prevent and control backout risk, protect pipe network and precision instrument, adapt to various injection well field conditions, improve the intelligentization, stability and operation efficiency of oilfield water injection development.

Description

Technical Field

[0001] This invention relates to the field of oilfield water injection development technology, specifically to an intelligent water injection well control system and method with anti-backflow function. Background Technology

[0002] Water injection technology has evolved continuously with oilfield development. In the early stages, it mainly relied on fixed water distribution and manual casting and adjustment. Gradually, it has been upgraded to automated stratified water injection. With the integration of electronic sensing, remote communication and intelligent control technologies, water injection well control has moved towards an intelligent stage of real-time monitoring and remote adjustment. In order to deal with the problem of formation fluid backflow under conditions such as injection shutdown and well washing, anti-backflow structures and downhole one-way control components have been gradually applied, developing from mechanical anti-backflow to intelligent linkage control. The current intelligent water injection well control system integrates multi-parameter sensing, automatic closed-loop control and anti-backflow protection to form an integrated operation mode, continuously improving the stability and long-term effectiveness of the water injection process.

[0003] Existing technologies, such as the invention patent applications related to oilfield water injection development using intelligent water injection wells disclosed in announcement numbers CN105422063A and CN109138948B, have significant shortcomings upon comparison: Existing intelligent water injection well control schemes lack a mechanism for real-time and accurate monitoring and dynamic numerical comparison of the dry and oil pressures of the injection well. They cannot quickly determine backflow risks based on pressure changes between the pipeline and formation sides, nor can they promptly execute targeted protective actions before or immediately after a risk occurs. The timeliness and effectiveness of the protective response are insufficient. Furthermore, after performing anti-backflow operations, there is neither a systematic method for continuous pressure recovery monitoring nor a scientific method for calculating the difference between dry and oil pressures. The analysis system is difficult to accurately and quantitatively determine the actual timing for resolving backflow risks. This can easily lead to blindly resuming water injection, resulting in repeated backflow, or excessive shutdown affecting water injection operations. At the same time, this type of solution is prone to causing formation fluid backflow that contaminates the water injection network and damages precision instruments such as flow meters. Furthermore, untimely water injection recovery can directly reduce the overall water injection development efficiency of the oilfield. In addition, the solution has poor hardware adaptability and parameter configuration flexibility. The type and range of pressure monitoring components cannot be flexibly selected and set according to the field conditions of different water injection wells. There is also no power failure retention configuration function, making it difficult to adapt to the actual operating needs of different types of water injection wells such as conventional, high-pressure, and low-pressure wells. The system lacks versatility and stability. Summary of the Invention

[0004] To address the aforementioned technical shortcomings, the present invention aims to provide an intelligent water injection well control system and method with anti-backflow function.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The first aspect of the present invention provides an intelligent water injection well control system with anti-backflow function, including a data acquisition module for real-time acquisition of dry pressure data and oil pressure data of the intelligent water injection well.

[0006] Data Analysis Module: Used to construct a real-time pressure monitoring dataset for intelligent water injection wells, perform dry pressure and oil pressure value comparison processing on the real-time pressure monitoring dataset of intelligent water injection wells, output the backflow risk judgment result of intelligent water injection wells, and execute backflow risk management instructions for intelligent water injection wells.

[0007] Data processing module: After executing the backflow risk management command of the intelligent water injection well, it updates the real-time pressure monitoring dataset of the intelligent water injection well, calculates the difference between dry pressure and oil pressure on the updated real-time pressure monitoring dataset of the intelligent water injection well, and outputs the analysis result of the intelligent water injection well's backflow risk relief. When the analysis result of the intelligent water injection well's backflow risk relief meets the preset recovery conditions, it generates and executes the intelligent water injection well's water injection recovery command.

[0008] A second aspect of the present invention provides a method for a smart water injection well control system with anti-backflow function, comprising step 1. Data acquisition: real-time acquisition of dry pressure data and oil pressure data of the smart water injection well.

[0009] Step 2. Data Analysis: Construct a real-time pressure monitoring dataset for the intelligent water injection well, perform a comparison of dry pressure and oil pressure values ​​on the real-time pressure monitoring dataset for the intelligent water injection well, output the backflow risk assessment result for the intelligent water injection well, and execute the backflow risk management instruction for the intelligent water injection well.

[0010] Step 3. Data Processing: After executing the backflow risk management command for the intelligent water injection well, update the real-time pressure monitoring dataset of the intelligent water injection well. Calculate the difference between dry pressure and oil pressure in the updated real-time pressure monitoring dataset of the intelligent water injection well, and output the analysis result of the intelligent water injection well's backflow risk relief. When the analysis result of the intelligent water injection well's backflow risk relief meets the preset recovery conditions, generate and execute the intelligent water injection well's water injection recovery command.

[0011] The beneficial effects of the present invention are as follows: (1) The first part of the present invention: by constructing a real-time pressure monitoring dataset with timestamps, the dry pressure and oil pressure can be accurately compared dynamically, the risk of backflow can be quickly and accurately determined, and the judgment rules of critical pressure state can be flexibly configured to adapt to different on-site working conditions. At the same time, the corresponding risk management instructions can be automatically executed according to the judgment results, so as to realize the automated and intelligent prevention and control of backflow risk, and greatly improve the timeliness and accuracy of risk response.

[0012] (2) The second part of the present invention: After executing the risk management instruction, the pressure monitoring dataset is continuously updated to ensure that the data source for pressure recovery analysis is continuous and real-time. The pressure recovery status is quantitatively analyzed by calculating the difference between dry pressure and oil pressure, rather than by empirical judgment. This makes the judgment of the risk relief of the backflow of the intelligent water injection well more scientific and objective, and fundamentally avoids the problem of repeated backflow or delayed water injection recovery caused by misjudgment.

[0013] (3) The third part of the present invention: The pressure monitoring hardware and core parameters of the present invention support flexible configuration. Different types of pressure transmitters can be selected according to the on-site working conditions. The transmitter range and pressure recovery threshold can also be set as needed. The configuration parameters have a power-off retention function. At the same time, each module relies on the remote terminal unit (RTU) to achieve integrated control. It is compatible with various types of water injection wells such as conventional, high pressure, and low pressure, which greatly improves the system's versatility, stability, and on-site adaptability. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the system modules of the present invention.

[0016] Figure 2 This is a schematic diagram of the method flow of the present invention.

[0017] Figure 3 This is a system architecture diagram of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Reference Figure 1 As shown, the present invention provides an intelligent water injection well control system with anti-backflow function, including a data acquisition module, a data analysis module, a data processing module and a local database.

[0020] It should be noted that the data acquisition module is associated with the data analysis module, the data analysis module is associated with the data processing module, and the local database is associated with the data acquisition module, the data analysis module, and the data processing module.

[0021] The data acquisition module is used to acquire dry pressure data and oil pressure data of the intelligent water injection well in real time.

[0022] It should be noted that the real-time acquisition of dry pressure data and oil pressure data of the intelligent water injection well is achieved through two wired pressure transmitters installed at the water injection well site. The first wired pressure transmitter is installed on the dry pressure pipeline before the flow control valve to collect the pressure before the valve on the water injection network side in real time, i.e., dry pressure data. The second wired pressure transmitter is installed at the oil pressure acquisition point to collect the pressure inside the wellbore in real time, i.e., oil pressure data. The two pressure transmitters are connected to the remote terminal unit (RTU) via wired lines to transmit the collected pressure signals to the RTU in real time.

[0023] It should be noted that the data acquisition module, data analysis module, and data processing module are not independent physical hardware entities, but functional logic modules implemented through the built-in program of the remote terminal unit (RTU). The three are integrated within the same RTU device and operate collaboratively.

[0024] It should be noted that the specific types of the first and second wired pressure transmitters can be selected according to the field conditions. For example, the first and second wired pressure transmitters can be two-wire 4-20mA output transmitters. This type of transmitter has the advantages of stable signal transmission, strong anti-interference ability, and simple wiring, and is suitable for long-distance signal transmission in oilfields. The pressure transmitters are not limited to this. Pressure transmitters that can realize real-time acquisition and transmission of dry pressure and oil pressure to remote terminal units, such as three-wire analog output transmitters, four-wire analog output transmitters, RS-485 Modbus digital communication transmitters, and HART protocol transmitters, can all be selected according to the actual field requirements.

[0025] It should also be noted that the range of the first and second wired pressure transmitters is a configurable key parameter that needs to be selected and set according to the actual pressure conditions of the injection well. For example, for conventional injection wells, the injection pressure usually fluctuates within the range of 0-35 MPa, so a pressure transmitter with a range of 0-35 MPa can be selected. For high-pressure or low-pressure injection wells, higher or lower range specifications can be selected accordingly, such as 0-50 MPa or 0-20 MPa. The selection of the range should ensure that it covers the entire pressure variation range under normal operation and abnormal conditions of the injection well, while taking into account the requirements of measurement accuracy and signal resolution. The range parameters of the pressure transmitter can be modified and set through configuration software, such as Modscan software. The modified range parameters have a power-off retention function in the transmitter to ensure the persistence of the configuration and the stable operation of the system. Those skilled in the art can flexibly select and configure the range of the pressure transmitter according to the actual working conditions on site, as long as it can accurately collect dry pressure and oil pressure data and transmit them to the remote terminal unit.

[0026] The data analysis module is used to construct a real-time pressure monitoring dataset for intelligent water injection wells, perform dry pressure and oil pressure value comparison processing on the real-time pressure monitoring dataset of intelligent water injection wells, output the backflow risk judgment result of intelligent water injection wells, and execute backflow risk management instructions for intelligent water injection wells.

[0027] In a specific embodiment of the present invention, the method for constructing the real-time pressure monitoring dataset of the intelligent water injection well is as follows: real-time acquisition and reception of dry pressure data of the intelligent water injection well from a first wired pressure transmitter installed in the dry pressure pipeline before the flow control valve; real-time acquisition and reception of oil pressure data of the intelligent water injection well from a second wired pressure transmitter installed at the oil pressure acquisition point; and association and combination of the dry pressure data and oil pressure data of the intelligent water injection well according to the same timestamp to construct the real-time pressure monitoring dataset of the intelligent water injection well.

[0028] It should be noted that the dry pressure data refers to the pressure value before the flow control valve in the water injection pipeline, reflecting the injection pressure on the water injection network side, while the oil pressure data refers to the pressure value inside the wellbore, reflecting the current pressure status on the formation side. These two sets of pressure data are the core basis for judging whether there is a risk of backflow in the intelligent water injection well.

[0029] In a specific embodiment of the present invention, the method for determining the backflow risk of the intelligent water injection well is as follows: read the dry pressure value and oil pressure value at the current moment from the real-time pressure monitoring dataset of the intelligent water injection well.

[0030] When the dry pressure value of the intelligent water injection well is greater than the oil pressure value, it is determined that there is no risk of backflow in the current intelligent water injection well.

[0031] When the dry pressure value of the intelligent water injection well is less than the oil pressure value, it is determined that the current intelligent water injection well has a risk of backflow.

[0032] It should be noted that when the dry pressure value of the intelligent water injection well is greater than the oil pressure value, it indicates that the pressure on the water injection pipeline side is higher than the pressure on the formation side, and the injected water can enter the formation normally. At this time, it is judged as a normal water injection condition, and there is no risk of backflow. When the dry pressure value of the intelligent water injection well is less than the oil pressure value, it indicates that the pressure on the formation side is higher than the pressure on the water injection pipeline side, and the formation fluid has a tendency to flow back into the water injection pipeline or has already backflowed. At this time, it is judged as having a risk of backflow.

[0033] It should be noted that when the dry pressure value of the intelligent water injection well is equal to the oil pressure value, the risk of backflow can be assigned according to the actual working conditions and safety management requirements. The processing logic of the boundary condition can be flexibly configured in the remote terminal unit. For example, it can be classified as a normal water injection condition to maintain the continuity of water injection, or it can be configured to maintain the judgment result of the previous cycle to avoid frequent actions. The specific configuration method does not affect the implementation of the core anti-backflow logic of this invention. Those skilled in the art can flexibly configure the processing method of the boundary condition according to the actual working conditions.

[0034] In a specific embodiment of the present invention, the method for executing the backflow risk management command of the intelligent water injection well is as follows: when it is determined that there is a backflow risk in the current intelligent water injection well, a valve closing command is immediately generated and sent to the flow control valve, and the flow control valve is controlled to execute the closing action command to cut off the connection between the water injection pipeline and the well.

[0035] When it is determined that there is no risk of backflow in the current intelligent water injection well, the normal water injection condition is maintained, the normal water injection command is generated and executed according to the preset injection volume, the flow control valve is kept open and the valve opening is adjusted to the target position.

[0036] It should be noted that the valve closing command is generated and sent to the flow control valve, which then quickly executes the closing action to cut off the connection between the water injection pipeline and the wellbore. The purpose is to effectively block backflow at the moment it occurs or before it occurs, to prevent formation fluid from flowing back into the water injection pipeline, to protect precision instruments such as flow meters from damage, and to prevent contamination of the water injection network.

[0037] In a specific embodiment of the present invention, the preset injection volume of the injection well is set to 50m³. 3 / d, the Remote Terminal Unit (RTU) monitors dry pressure and oil pressure data in real time. At a certain moment, it reads from the real-time pressure monitoring dataset that the current dry pressure is 5 MPa and the oil pressure is 6 MPa. After comparison, it determines that the dry pressure of 5 MPa is less than the oil pressure of 6 MPa, thus indicating a risk of backflow. The RTU immediately generates a valve closing command and sends it to the flow control valve, controlling the flow control valve to close, forcibly cutting off the connection between the water injection pipeline and the wellbore, blocking the reverse flow of formation fluid to the water injection pipeline. At another moment, it reads from the real-time pressure monitoring dataset that the current dry pressure is 8 MPa and the oil pressure is 7 MPa. After comparison, it determines that the dry pressure of 8 MPa is greater than the oil pressure of 7 MPa, thus indicating no risk of backflow. The RTU maintains normal water injection conditions, injecting 50 m³ of water according to the preset injection volume. 3 / d generates a normal water injection command and sends it to the flow control valve, which controls the flow control valve to remain open and adjusts the valve opening to the target position to ensure that the water injection flow rate is stable within the preset range.

[0038] The data processing module is used to: after executing the backflow risk management command of the intelligent water injection well, update the real-time pressure monitoring dataset of the intelligent water injection well, calculate the difference between dry pressure and oil pressure on the updated real-time pressure monitoring dataset of the intelligent water injection well, output the analysis result of the intelligent water injection well relieving backflow risk, and when the analysis result of the intelligent water injection well relieving backflow risk meets the preset recovery conditions, generate and execute the intelligent water injection well recovery water injection command.

[0039] In a specific embodiment of the present invention, the method for updating the real-time pressure monitoring dataset of the intelligent water injection well is as follows: after the flow control valve of the intelligent water injection well executes the closing action command, the dry pressure data and oil pressure data at the current moment are collected and received from the first wired pressure transmitter and the second wired pressure transmitter in real time according to the preset collection frequency. The newly collected dry pressure data and oil pressure data are associated and combined according to the current timestamp and appended to the original real-time pressure monitoring dataset to form the updated real-time pressure monitoring dataset of the intelligent water injection well.

[0040] For example, a preset sampling frequency, such as once every 10 seconds, once every 20 seconds, once every 30 seconds, etc.

[0041] It should be noted that the purpose of updating the real-time pressure monitoring dataset is to provide continuous and real-time basic data for subsequent water injection recovery analysis. When a backflow risk is detected and a valve closing command is executed, the intelligent water injection well enters the backflow protection state. At this time, the formation pressure and pipeline pressure may continue to fluctuate. The system needs to continuously monitor the changing trends of dry pressure and oil pressure so that water injection can be restored in a timely manner when the backflow risk is eliminated.

[0042] In a specific embodiment of the present invention, the method for calculating the difference between dry pressure and oil pressure in the updated real-time pressure monitoring dataset of the intelligent water injection well is as follows: read the dry pressure value and oil pressure value at the current moment from the updated real-time pressure monitoring dataset of the intelligent water injection well, calculate the difference between the dry pressure value and the oil pressure value of the intelligent water injection well, and obtain the real-time pressure difference of the intelligent water injection well.

[0043] It should be noted that the real-time pressure difference of the intelligent water injection well may be positive, negative or zero. The calculated difference result will be used as the input parameter for subsequent pressure recovery analysis, and compared with the preset recovery threshold to determine whether the conditions for water injection recovery are met.

[0044] It should be noted that the frequency of calculating the pressure difference in the intelligent water injection well needs to be consistent with the data acquisition frequency to ensure that critical moments of pressure changes can be captured in real time.

[0045] Reference Figure 3 As shown in the specific embodiment of the present invention, the method for outputting the analysis results of the intelligent water injection well to eliminate the risk of backflow is as follows: read the dry pressure value and oil pressure value at the current moment and obtain the real-time pressure difference value of the intelligent water injection well at the current moment from the real-time pressure monitoring dataset of the intelligent water injection well.

[0046] When the dry pressure value of the intelligent water injection well is greater than the oil pressure value, and the corresponding pressure difference is greater than the preset recovery threshold, the risk of backflow of the intelligent water injection well is determined to be eliminated; otherwise, it is not eliminated.

[0047] The preset recovery threshold is a configurable parameter with a power-off retention function in the remote terminal unit. The recovery threshold is set to a positive number greater than zero, such as 0.2MPa or 0.5MPa, rather than simply requiring the dry pressure to be greater than the oil pressure (i.e., the difference is greater than zero). The purpose is to build a dynamic safety margin. This margin can effectively prevent frequent start-stops caused by small pressure fluctuations or instantaneous measurement errors of sensors, thereby protecting the actuator of the flow control valve and extending the equipment life. When the dry pressure value of the intelligent water injection well is greater than the oil pressure value, and the difference between the dry pressure and the oil pressure is greater than this preset recovery threshold, it is determined that the backflow risk of the intelligent water injection well has been completely eliminated, and the conditions for stable water injection recovery are met.

[0048] In a specific embodiment of the present invention, the method for generating and executing the restoration water injection command of the intelligent water injection well is as follows: when it is determined that the risk of backflow of the intelligent water injection well has been eliminated, a valve opening command is immediately generated and sent to the flow control valve. At the same time, a normal water injection command is generated according to the preset injection volume and sent to the flow control valve. The flow control valve is controlled to perform the opening action and adjust to the target opening degree to restore the normal water injection condition of the intelligent water injection well.

[0049] It should be noted that the generation and execution of the water injection restoration command is the final control action based on the pressure restoration judgment result. Its purpose is to restore the normal production of the water injection well in a timely manner after the backflow risk has been completely eliminated. The valve opening command and the normal water injection command can be issued together or executed in steps. The specific configuration can be based on the control logic of the flow control valve.

[0050] In a specific embodiment of the present invention, a preset recovery threshold of 0.5 MPa is set, and this parameter has a power-off retention function in the remote terminal unit (RTU). When a risk of backflow is detected and a valve closing command is executed, the RTU continuously monitors pressure changes. At a certain moment, it reads the current dry pressure value as 7.5 MPa and the oil pressure value as 7 MPa from the updated real-time pressure monitoring dataset. At this time, the dry pressure value of the intelligent water injection well is greater than the oil pressure value, and the real-time pressure difference is calculated to be 0.5 MPa. After comparing it with the preset recovery threshold of 0.5 MPa, it is determined that the real-time pressure difference is equal to the preset recovery threshold, and then the intelligent... If the risk of backflow from the injection well has not been eliminated, the system will continue to keep the valve closed. At another moment, when the updated real-time pressure monitoring dataset reads a dry pressure of 8 MPa and an oil pressure of 7 MPa, the dry pressure of the intelligent injection well is greater than the oil pressure. The calculated real-time pressure difference is 1 MPa. Comparing this to the preset recovery threshold of 0.5 MPa, it is determined that the real-time pressure difference of 1 MPa is greater than the preset recovery threshold of 0.5 MPa. Therefore, the system outputs a result indicating that the risk of backflow from the intelligent injection well has been eliminated. The remote terminal unit (RTU) immediately generates a valve opening command and sends it to the flow control valve, simultaneously dispensing 50 m³ of water according to the preset injection rate. 3 / d generates a normal water injection command and sends it to the flow control valve, which then controls the valve to open and adjust to the target opening degree, restoring the normal water injection condition of the intelligent water injection well.

[0051] Reference Figure 2 As shown, the present invention provides a method for a smart water injection well control system with anti-backflow function, including step 1. Data acquisition: real-time acquisition of dry pressure data and oil pressure data of the smart water injection well.

[0052] Step 2. Data Analysis: Construct a real-time pressure monitoring dataset for the intelligent water injection well, perform a comparison of dry pressure and oil pressure values ​​on the real-time pressure monitoring dataset for the intelligent water injection well, output the backflow risk assessment result for the intelligent water injection well, and execute the backflow risk management instruction for the intelligent water injection well.

[0053] Step 3. Data Processing: After executing the backflow risk management command for the intelligent water injection well, update the real-time pressure monitoring dataset of the intelligent water injection well. Calculate the difference between dry pressure and oil pressure in the updated real-time pressure monitoring dataset of the intelligent water injection well, and output the analysis result of the intelligent water injection well's backflow risk relief. When the analysis result of the intelligent water injection well's backflow risk relief meets the preset recovery conditions, generate and execute the intelligent water injection well's water injection recovery command.

[0054] The examples described in this invention are not limited to the specific embodiments listed above. The examples are merely illustrative to facilitate understanding of the invention and do not constitute a limitation on the scope of protection of this invention. Any modifications, equivalent substitutions, etc., made within the spirit and principles of this invention should be included within the scope of protection.

[0055] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in this specification, they should all fall within the protection scope of the present invention.

Claims

1. An intelligent water injection well control system with anti-backflow function, characterized in that, Includes the following modules: Data acquisition module: used to acquire dry pressure data and oil pressure data of intelligent water injection wells in real time; Data analysis module: used to construct a real-time pressure monitoring dataset of intelligent water injection wells, perform dry pressure and oil pressure value comparison processing on the real-time pressure monitoring dataset of intelligent water injection wells, output the backflow risk judgment result of intelligent water injection wells, and execute backflow risk management instructions of intelligent water injection wells; Data processing module: After executing the backflow risk management command of the intelligent water injection well, it updates the real-time pressure monitoring dataset of the intelligent water injection well, calculates the difference between dry pressure and oil pressure on the updated real-time pressure monitoring dataset of the intelligent water injection well, and outputs the analysis result of the intelligent water injection well's backflow risk relief. When the analysis result of the intelligent water injection well's backflow risk relief meets the preset recovery conditions, it generates and executes the intelligent water injection well's water injection recovery command.

2. The intelligent water injection well control system with anti-backflow function according to claim 1, characterized in that, The specific method for constructing the real-time pressure monitoring dataset for intelligent water injection wells is as follows: The dry pressure data of the smart water injection well is collected and received in real time from the first wired pressure transmitter installed in the dry pressure pipeline before the flow control valve, and the oil pressure data of the smart water injection well is collected and received in real time from the second wired pressure transmitter installed at the oil pressure acquisition point. The dry pressure data and oil pressure data of the smart water injection well are associated and combined according to the same timestamp to construct a real-time pressure monitoring dataset of the smart water injection well.

3. The intelligent water injection well control system with anti-backflow function according to claim 2, characterized in that, The specific method for determining the backflow risk of the intelligent water injection well is as follows: The dry pressure and oil pressure values ​​at the current moment are read in real time from the real-time pressure monitoring dataset of the intelligent water injection well. When the dry pressure value of the intelligent water injection well is greater than the oil pressure value, it is determined that there is no risk of backflow in the current intelligent water injection well; When the dry pressure value of the intelligent water injection well is less than the oil pressure value, it is determined that the current intelligent water injection well has a risk of backflow.

4. The intelligent water injection well control system with anti-backflow function according to claim 3, characterized in that, The specific method for executing the backflow risk management command of the intelligent water injection well is as follows: When it is determined that there is a risk of backflow in the current intelligent water injection well, a valve closing command is immediately generated and sent to the flow control valve to control the flow control valve to execute the closing action command and cut off the connection between the water injection pipeline and the well. When it is determined that there is no risk of backflow in the current intelligent water injection well, the normal water injection condition is maintained, the normal water injection command is generated and executed according to the preset injection volume, the flow control valve is kept open and the valve opening is adjusted to the target position.

5. A smart water injection well control system with anti-backflow function according to claim 4, characterized in that, The specific method for updating the real-time pressure monitoring dataset of the smart water injection well is as follows: After the flow control valve of the intelligent water injection well executes the closing action command, it collects and receives the dry pressure data and oil pressure data at the current moment from the first wired pressure transmitter and the second wired pressure transmitter in real time according to the preset acquisition frequency. The newly collected dry pressure data and oil pressure data are associated and combined according to the current timestamp, and added to the original real-time pressure monitoring dataset to form the updated real-time pressure monitoring dataset of the intelligent water injection well.

6. The intelligent water injection well control system with anti-backflow function according to claim 5, characterized in that, The specific method for calculating the difference between dry pressure and oil pressure in the updated real-time pressure monitoring dataset of the intelligent water injection well is as follows: The dry pressure and oil pressure values ​​at the current moment are read from the updated real-time pressure monitoring dataset of the smart water injection well. The difference between the dry pressure and oil pressure values ​​of the smart water injection well is calculated to obtain the real-time pressure difference of the smart water injection well.

7. A smart water injection well control system with anti-backflow function according to claim 6, characterized in that, The specific method for analyzing the results of the intelligent water injection well's elimination of backflow risk is as follows: The dry pressure and oil pressure values ​​at the current moment are read from the real-time pressure monitoring dataset of the intelligent water injection well, and the real-time pressure difference of the intelligent water injection well at the current moment is obtained. When the dry pressure value of the intelligent water injection well is greater than the oil pressure value, and the corresponding pressure difference is greater than the preset recovery threshold, the risk of backflow of the intelligent water injection well is determined to be eliminated; otherwise, it is not eliminated.

8. A smart water injection well control system with anti-backflow function according to claim 7, characterized in that, The specific method for generating and executing the intelligent water injection well restoration water injection command is as follows: When it is determined that the risk of backflow in the intelligent water injection well has been eliminated, a valve opening command is immediately generated and sent to the flow control valve. At the same time, a normal water injection command is generated according to the preset injection volume and sent to the flow control valve. The flow control valve is controlled to perform the opening action and adjust to the target opening degree, restoring the normal water injection condition of the intelligent water injection well.

9. A method for implementing an intelligent water injection well control system with anti-backflow function as described in any one of claims 1-8, characterized in that, include: Step 1. Data Acquisition: Real-time acquisition of dry pressure and oil pressure data from intelligent water injection wells; Step 2. Data Analysis: Construct a real-time pressure monitoring dataset for the intelligent water injection well, perform a comparison of dry pressure and oil pressure values ​​on the real-time pressure monitoring dataset for the intelligent water injection well, output the backflow risk assessment result of the intelligent water injection well, and execute the backflow risk management instruction for the intelligent water injection well. Step 3. Data Processing: After executing the backflow risk management command for the intelligent water injection well, update the real-time pressure monitoring dataset of the intelligent water injection well. Calculate the difference between dry pressure and oil pressure in the updated real-time pressure monitoring dataset of the intelligent water injection well, and output the analysis result of the intelligent water injection well's backflow risk relief. When the analysis result of the intelligent water injection well's backflow risk relief meets the preset recovery conditions, generate and execute the intelligent water injection well's water injection recovery command.

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