Valve-Pump Interlocking Safety Control System and Method for Brine Wells

Abstract

This invention discloses a valve-pump linkage safety control system and method for brine wells, belonging to the field of brine well automation control. The system includes a data acquisition module for collecting operating parameter data of the brine well, including brine well level data, freshwater injection flow rate data, pipeline pressure data, and medium temperature data; a linkage control module for receiving the operating parameter data and executing valve-pump linkage safety control logic based on the operating parameter data, including process interlock logic and safety interlock logic; and an execution module for controlling the start and stop of the brine pump and the opening, closing, and opening degree adjustment of the freshwater injection valve according to the control commands output by the linkage control module. This achieves automated safety control of the valve-pump linkage in brine wells.

Description

Technical Field

[0001] This invention relates to the field of industrial process automatic control technology, and in particular to a valve-pump linkage safety control system and method for brine wells. Background Technology

[0002] Brine wells are key facilities for brine resource extraction. Their operation involves the start-up and shutdown control of the brine pump and the coordination of the freshwater injection valves. In traditional brine well operation and management, the start-up and shutdown of the brine pump and the control of the freshwater injection valves primarily rely on manual operation. Operators judge operating parameters such as brine well level, pipeline pressure, and freshwater injection flow rate based on experience, and manually control the start-up and shutdown of the brine pump and the opening and closing of the freshwater injection valves.

[0003] However, this manual control method has the following drawbacks: First, manual operation has a response delay. When emergencies occur such as abnormal rise or fall in the brine level, excessive pipeline pressure, or equipment failure, operators may find it difficult to detect and take protective measures such as stopping the pump and closing the valve in time, which may easily lead to brine overflow, pipeline damage, or even safety accidents. Second, there is no linkage control mechanism between the brine pump and the freshwater injection valve. The start and stop of the pump and the opening and closing of the valve are executed independently, and process interlocking cannot be achieved. It is easy for the brine pump to stop running but the freshwater injection valve to remain open, resulting in continuous freshwater injection and dilution of the brine concentration, affecting the brine extraction efficiency. It is also possible for the brine pump to start but the freshwater injection valve to fail to open in time, resulting in the brine pump running dry and being damaged. Third, the existing brine well control system is mostly an independent single-well control, forming information silos between the brine wells. There is a lack of a unified data acquisition and centralized monitoring platform. Managers cannot grasp the operating status of all brine wells in real time, making it difficult to achieve centralized management and remote monitoring of large-scale brine well groups.

[0004] Therefore, there is an urgent need for an automated control system and method for brine wells that can achieve safe control of valve-pump linkage. Summary of the Invention

[0005] This invention provides a valve-pump linkage safety control system and method for brine wells to solve the above-mentioned problems in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A valve-pump linkage safety control system for brine wells includes:

[0008] The data acquisition module is used to collect the operating parameter data of the brine well, including brine well liquid level data, freshwater injection flow rate data, pipeline pressure data, and medium temperature data.

[0009] The linkage control module is used to receive operating parameter data and execute valve-pump linkage safety control logic based on the operating parameter data. The valve-pump linkage safety control logic includes process interlock logic and safety interlock logic.

[0010] The execution module is used to control the start and stop of the brine pump and the opening, closing and opening degree adjustment of the freshwater injection valve according to the control commands output by the linkage control module;

[0011] Among them, the process interlock logic is used to control the freshwater injection valve to open and adjust the flow rate according to the preset linkage sequence during the brine pump startup process, and to control the freshwater injection valve to close according to the preset linkage sequence during the brine pump shutdown process.

[0012] The safety interlock logic is used to control the brine pump to stop running and simultaneously control the freshwater injection valve to close when an abnormality is detected in the brine well equipment, so as to realize the linkage protection during the operation of the brine well.

[0013] Furthermore, the data acquisition module includes a level sensor, a flow sensor, a pressure sensor, and a temperature sensor;

[0014] The liquid level sensor is installed at the wellhead of the brine well to detect the liquid level in the brine well in real time and output the liquid level data;

[0015] The flow sensor is installed in the freshwater injection pipeline to detect the freshwater injection flow rate and output flow data;

[0016] The pressure sensor is installed in the brine extraction pipeline to detect the pressure of the medium inside the pipeline and output pressure data;

[0017] Temperature sensors are installed in the brine extraction pipeline to detect the temperature of the medium and output temperature data.

[0018] Furthermore, the process interlocking logic includes:

[0019] When the preset pump start-up conditions are met, the linkage control module outputs a pump start-up command to the execution module to start the brine pump. Before or during the start-up of the brine pump, it outputs a valve pre-opening command to make the freshwater injection valve be in the initial linkage opening degree. The opening degree of the freshwater injection valve is dynamically adjusted according to the freshwater injection flow rate data in the operating parameter data.

[0020] When the preset pump stop conditions are met, the linkage control module outputs a pump stop command to the execution module to stop the brine pump, and outputs a valve shut-off command before or during the stopping process of the brine pump to control the freshwater injection valve to close in the linkage sequence.

[0021] Among them, the preset pump start-up conditions and preset pump stop-up conditions include a combination of at least one or more parameters based on the brine well level, pipeline pressure, medium temperature and valve status.

[0022] Furthermore, the safety interlock logic includes:

[0023] The linkage control module monitors operating parameter data in real time and triggers a safety interlock when any of the following abnormal conditions are detected:

[0024] The pipeline pressure exceeds the preset safe pressure range, the brine well level exceeds the preset safe level range, the medium temperature exceeds the preset safe temperature range, the fresh water injection flow rate is abnormal, or the brine pump operating parameters are abnormal.

[0025] After the safety interlock is triggered, the linkage control module outputs a pump stop command and a valve close command to the execution module, controlling the brine pump to stop running and controlling the freshwater injection valve to close, while simultaneously outputting an alarm signal;

[0026] Among them, the priority of safety interlock logic is higher than that of process interlock logic.

[0027] Furthermore, the linkage control module adopts a PID control strategy to dynamically adjust the opening of the freshwater injection valve. The PID control strategy uses a preset flow rate setpoint as the input target value and the freshwater injection flow rate data in the operating parameter data as the feedback value. The valve opening control signal is output to the execution module through PID calculation. The execution module adjusts the opening of the freshwater injection valve according to the valve opening control signal so that the actual injection flow rate tracks the flow rate setpoint.

[0028] Furthermore, the linkage control module is also used to detect anomalies in the operating parameter data. Anomaly detection includes:

[0029] The real-time collected operating parameter data is compared with its corresponding preset normal range. When any operating parameter data exceeds its corresponding preset normal range, it is determined to be an abnormal state, and the abnormality type and occurrence time are recorded.

[0030] Anomaly detection also includes auxiliary judgment based on parameter change trends within a continuous sampling period to reduce misjudgments caused by instantaneous fluctuations.

[0031] Furthermore, the system also includes a remote communication module, an alarm module, and a multi-well coordinated control module;

[0032] The remote communication module is used to transmit operating parameter data and control commands between the brine well site and the remote monitoring center.

[0033] The alarm module is used to issue alarm information when an abnormal state is detected. The alarm information includes the abnormality type, abnormal parameter value and occurrence time.

[0034] The multi-well coordination control module is used to perform unified scheduling and linkage control based on the overall operating status of multiple brine wells. It also supports group management of multiple brine wells by region, generates batch control commands based on the operating parameter data of each brine well and preset scheduling strategies, and sends them to the linkage control module of each brine well through the remote communication module.

[0035] The preset scheduling strategy includes comprehensive scheduling based on well condition priority, load balancing, and risk suppression.

[0036] Furthermore, the alarm module has a hierarchical alarm mechanism, which includes two or more levels of early warning, alarm, and emergency alarm.

[0037] When an abnormal state is detected, the alarm module determines the alarm level based on the type of abnormality, the duration of the abnormality, and the scope of the abnormality, and simultaneously sends the alarm information to the remote monitoring center and the on-site execution terminal, triggering the corresponding handling process based on the alarm information.

[0038] Furthermore, the linkage control module is also equipped with linkage protection control logic, which is used to perform gradual opening and gradual closing control on the freshwater injection valve during the start-up and shutdown of the brine pump, and to perform delayed shutdown after the pump stops.

[0039] Furthermore, a valve-pump linkage safety control method for brine wells applied to a system includes:

[0040] S1: Collect the operating parameter data of the brine well through the data acquisition module. The operating parameter data includes brine well liquid level data, fresh water injection flow rate data, pipeline pressure data and medium temperature data.

[0041] S2: The linkage control module receives operating parameter data and executes valve-pump linkage safety control logic based on the operating parameter data. The valve-pump linkage safety control logic includes process interlock logic and safety interlock logic.

[0042] S3: The execution module controls the start and stop of the brine pump and the opening, closing and opening degree adjustment of the freshwater injection valve according to the control commands output by the linkage control module;

[0043] S4: During the start-up of the brine pump, valve pre-opening and flow closed-loop regulation are performed; during the stop-up of the brine pump, valve shut-off control is performed.

[0044] S5: When an abnormality is detected in the brine well equipment, the safety interlock action of stopping the pump and closing the valve is executed first, and the alarm information is output to the remote monitoring center.

[0045] Compared with the prior art, the present invention has the following advantages:

[0046] This invention constructs a complete safety control architecture for the valve-pump linkage in brine wells by setting up a data acquisition module, a linkage control module, and an execution module. It achieves automatic linkage control of the brine pump start-up and shutdown with the opening, closing, and adjustment of the freshwater injection valve, fundamentally solving the problems of low efficiency and untimely response of manual control. The linkage control module incorporates a dual logic mechanism of process interlocking logic and safety interlocking logic, ensuring orderly linkage of valves and pumps during normal production processes while providing rapid safety protection under abnormal operating conditions, significantly improving the safety and automation level of brine well operation.

[0047] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0048] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0049] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0050] Figure 1 This is a structural diagram of the valve-pump linkage safety control system for brine wells in an embodiment of the present invention;

[0051] Figure 2 This is a flowchart of the valve-pump linkage safety control system for brine wells in an embodiment of the present invention. Detailed Implementation

[0052] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0053] The embodiments of the present invention provide, as follows Figure 1 As shown, a valve-pump linkage safety control system for brine wells includes:

[0054] The data acquisition module is used to collect the operating parameter data of the brine well, including brine well liquid level data, freshwater injection flow rate data, pipeline pressure data, and medium temperature data.

[0055] The linkage control module is used to receive operating parameter data and execute valve-pump linkage safety control logic based on the operating parameter data. The valve-pump linkage safety control logic includes process interlock logic and safety interlock logic.

[0056] The execution module is used to control the start and stop of the brine pump and the opening, closing and opening degree adjustment of the freshwater injection valve according to the control commands output by the linkage control module;

[0057] Among them, the process interlock logic is used to control the freshwater injection valve to open and adjust the flow rate according to the preset linkage sequence during the brine pump startup process, and to control the freshwater injection valve to close according to the preset linkage sequence during the brine pump shutdown process.

[0058] The safety interlock logic is used to control the brine pump to stop running and simultaneously control the freshwater injection valve to close when an abnormality is detected in the brine well equipment, so as to realize the linkage protection during the operation of the brine well.

[0059] The working principle and beneficial effects of the above technical solution are as follows: During normal operation of the brine well, the data acquisition module continuously collects the operating parameter data of the brine well. The operating parameter data includes brine well liquid level data, freshwater injection flow rate data, pipeline pressure data, and medium temperature data. The brine well liquid level data reflects changes in the liquid level within the well; the freshwater injection flow rate data reflects the actual supply status during the water injection process; the pipeline pressure data reflects the pressure status of the brine delivery channel; and the medium temperature data reflects the thermal state of the transported medium and changes in the operating environment.

[0060] After receiving the aforementioned operating parameter data, the linkage control module comprehensively evaluates the data and generates valve-pump linkage control commands based on preset control conditions. These commands include start / stop commands for the brine pump and opening / closing and opening degree adjustment commands for the freshwater injection valve. The execution module, based on the commands output by the linkage control module, drives the brine pump and freshwater injection valve to operate in a predetermined sequence, thereby establishing a coordinated control relationship between the brine pump and the valve.

[0061] The process interlock logic is used to ensure sequential control under normal start-up and shutdown conditions. Before or during the start-up of the brine pump, the control system first sends a pre-opening command to the freshwater injection valve, causing the valve to enter an initial linkage opening state. Then, based on the real-time collected freshwater injection flow data, the valve opening is dynamically corrected to gradually transition the flow to a stable state before allowing the brine pump to enter continuous operation. This avoids shocks, pressure build-up, or cavitation caused by the valve being completely closed or improperly opened at the moment of pump start-up.

[0062] Before or during the shutdown of the brine pump, the linkage control module first outputs a pre-shutdown linkage control command and drives the freshwater injection valve to gradually close in a preset sequence, rather than closing it abruptly, to reduce the risk of sudden pressure changes and media backflow during pump shutdown. After the pump stops, the valves are finally closed according to the linkage strategy, thus achieving a smooth shutdown.

[0063] The safety interlock logic is used to handle abnormal operating conditions. During operation, the linkage control module continuously compares various operating parameters. When an abnormality is detected in the brine well equipment, it immediately switches to the safety interlock state, controlling the brine pump to stop running and simultaneously closing the freshwater injection valve to cut off possible abnormal media flow paths, achieving rapid protection. Because the safety interlock logic has higher priority, even if a process interlock is being executed, once the safety interlock is triggered, it will immediately override the original control command, ensuring the system enters a safe state first.

[0064] In another embodiment, the data acquisition module includes a level sensor, a flow sensor, a pressure sensor, and a temperature sensor;

[0065] The liquid level sensor is installed at the wellhead of the brine well to detect the liquid level in the brine well in real time and output the liquid level data;

[0066] The flow sensor is installed in the freshwater injection pipeline to detect the freshwater injection flow rate and output flow data;

[0067] The pressure sensor is installed in the brine extraction pipeline to detect the pressure of the medium inside the pipeline and output pressure data;

[0068] Temperature sensors are installed in the brine extraction pipeline to detect the temperature of the medium and output temperature data.

[0069] The working principle and beneficial effects of the above technical solution are as follows: The data acquisition module forms a closed-loop monitoring link through multiple field sensors. A liquid level sensor is installed at the wellhead of the brine extraction well to continuously sense changes in the liquid level height within the well and output liquid level data; a flow sensor is installed in the freshwater injection pipeline to measure instantaneous and continuous flow rate changes during freshwater injection and output flow rate data; a pressure sensor is installed in the brine extraction pipeline to detect the pressure of the medium inside the pipeline and output pressure data; and a temperature sensor is installed in the brine extraction pipeline to acquire the medium temperature and output temperature data.

[0070] The analog or digital signals acquired by the aforementioned sensors are converted by the acquisition circuit and then sent to the linkage control module. The linkage control module verifies, integrates, and synchronizes the signals according to their data type, forming a unified dataset of operating parameters. This dataset provides a basis for subsequent process interlock judgments, safety interlock judgments, and valve opening adjustments. Because each sensor is located at a key position at the wellhead, water injection pipeline, and brine extraction pipeline, it can reflect the actual operating status of the brine well more completely, avoiding erroneous control caused by single-point data distortion.

[0071] In another embodiment, the process interlocking logic includes:

[0072] When the preset pump start-up conditions are met, the linkage control module outputs a pump start-up command to the execution module to start the brine pump. Before or during the start-up of the brine pump, it outputs a valve pre-opening command to make the freshwater injection valve be in the initial linkage opening degree. The opening degree of the freshwater injection valve is dynamically adjusted according to the freshwater injection flow rate data in the operating parameter data.

[0073] When the preset pump stop conditions are met, the linkage control module outputs a pump stop command to the execution module to stop the brine pump, and outputs a valve shut-off command before or during the stopping process of the brine pump to control the freshwater injection valve to close in the linkage sequence.

[0074] Among them, the preset pump start-up conditions and preset pump stop-up conditions include a combination of at least one or more parameters based on the brine well level, pipeline pressure, medium temperature and valve status.

[0075] The working principle and beneficial effects of the above technical solution are as follows: the process interlocking logic is the basic control mechanism for the system to realize the coordinated operation of valves and pumps. The core is to determine the sequence of pump start-up and pump stop based on the current working conditions of the brine well, and to keep the valve action and pump action linked.

[0076] When the preset pump start-up conditions are met, the linkage control module first confirms that the brine well level, pipeline pressure, medium temperature, and valve status are within the allowable pump start-up range. Then, it outputs a pump start-up command to the execution module, driving the brine pump to start. Before or during pump start-up, the linkage control module synchronously outputs a valve pre-opening command, causing the freshwater injection valve to enter its initial linkage opening degree, thus establishing stable medium supply conditions during pump start-up. Subsequently, the linkage control module dynamically adjusts the valve opening based on the freshwater injection flow rate data, gradually bringing the freshwater injection process closer to the target flow rate, avoiding flow imbalance caused by opening too quickly or too slowly.

[0077] When the preset pump shutdown conditions are met, the linkage control module first outputs a pump shutdown command to the execution module, driving the brine pump to stop running. Before or during pump shutdown, it issues a valve closing command, causing the freshwater injection valve to gradually close according to a preset linkage sequence. This sequential control prevents a sudden drop in residual pressure or backflow of the medium in the pipeline when the pump stops, improving the smoothness and safety of system shutdown.

[0078] The preset pump start-up and stop conditions are not determined based on a single data point, but rather by combining one or more parameters, including brine well level, pipeline pressure, medium temperature, and valve status, to improve the adaptability and accuracy of process interlocking. For example, the system allows pump start-up only when the level, pressure, and temperature are all within suitable ranges and the valves are in a controllable state; when certain parameters enter the shutdown control range, the pump stop procedure is triggered, ensuring that the system is always in a predictable and controllable operating state.

[0079] In another embodiment, the safety interlock logic includes:

[0080] The linkage control module monitors operating parameter data in real time and triggers a safety interlock when any of the following abnormal conditions are detected:

[0081] The pipeline pressure exceeds the preset safe pressure range, the brine well level exceeds the preset safe level range, the medium temperature exceeds the preset safe temperature range, the fresh water injection flow rate is abnormal, or the brine pump operating parameters are abnormal.

[0082] After the safety interlock is triggered, the linkage control module outputs a pump stop command and a valve close command to the execution module, controlling the brine pump to stop running and controlling the freshwater injection valve to close, while simultaneously outputting an alarm signal;

[0083] Among them, the priority of safety interlock logic is higher than that of process interlock logic.

[0084] The working principle and beneficial effects of the above technical solution are as follows: the safety interlock logic is used to respond quickly to abnormal conditions during the operation of brine wells, with the primary goal of preventing equipment damage, media leakage and loss of control.

[0085] The linkage control module continuously monitors the operating parameter data and compares the current values ​​with the corresponding safety threshold ranges in real time. A safety interlock is triggered when any of the following abnormal conditions are detected: pipeline pressure exceeds the preset safe pressure range, brine well level exceeds the preset safe level range, medium temperature exceeds the preset safe temperature range, freshwater injection flow rate is abnormal, or brine pump operating parameters are abnormal.

[0086] The linkage control module continuously monitors the operating parameter data and calculates the multi-parameter fusion safety linkage index S. The formula for calculating the multi-parameter fusion safety linkage index S is as follows:

[0087]

[0088] in, The number of parameter types in the runtime parameter data. For the first Real-time collected values ​​of various operating parameters For the first Preset reference values ​​for various operating parameters For the first The weighting coefficients corresponding to the various operating parameters are equal to 1. When the multi-parameter fusion safety linkage index S exceeds the preset dynamic safety threshold, the linkage control module determines it to be an abnormal state and triggers the safety interlock.

[0089] Once the safety interlock is triggered, the linkage control module immediately outputs a pump stop command and a valve close command to the execution module, stopping the brine pump and simultaneously driving the freshwater injection valve to close, quickly cutting off the medium flow path under abnormal conditions. At the same time, the system outputs an alarm signal, prompting on-site and remote monitoring personnel to intervene promptly. Because the safety interlock logic has higher priority than the process interlock logic, regardless of whether the system is currently in the pump start-up, regulation, or stop-up process, as long as a safety anomaly is detected, the system will immediately switch to safety protection mode to achieve linkage protection for the brine well.

[0090] In another embodiment, the linkage control module uses a PID control strategy to dynamically adjust the opening of the freshwater injection valve. The PID control strategy uses a preset flow rate setpoint as the input target value and the freshwater injection flow rate data in the operating parameter data as the feedback value. The valve opening control signal is output to the execution module through PID calculation. The execution module adjusts the opening of the freshwater injection valve according to the valve opening control signal so that the actual injection flow rate tracks the flow rate setpoint.

[0091] The working principle and beneficial effects of the above technical solution are as follows: To make the freshwater injection process smoother, the system introduces a PID control strategy during valve opening adjustment. The linkage control module takes the preset flow rate setpoint as the target input and the freshwater injection flow rate data collected by the sensor as the feedback input. By comparing the deviation between the target flow rate and the actual flow rate, PID calculation is performed to generate the valve opening control signal.

[0092] The execution module adjusts the opening of the freshwater injection valve according to the control signal, making the valve opening dynamically change with the flow deviation. When the actual flow is lower than the set value, the valve opening is appropriately increased; when the actual flow is higher than the set value, the valve opening is appropriately decreased; when the flow is close to the set value, a relatively stable opening output is maintained. Through comprehensive correction of proportional, integral, and derivative parameters, the system can suppress flow fluctuations, reduce regulation lag, and make the actual injected flow better track the flow set value, thereby improving the stability and continuity of the valve-pump linkage control of the brine well.

[0093] In another embodiment, the linkage control module is also used to detect anomalies in the operating parameter data, including:

[0094] The real-time collected operating parameter data is compared with its corresponding preset normal range. When any operating parameter data exceeds its corresponding preset normal range, it is determined to be an abnormal state, and the abnormality type and occurrence time are recorded.

[0095] Anomaly detection also includes auxiliary judgment based on parameter change trends within a continuous sampling period to reduce misjudgments caused by instantaneous fluctuations.

[0096] The working principle and beneficial effects of the above technical solution are as follows: In addition to real-time control, the linkage control module also undertakes the task of anomaly detection. The linkage control module works by comparing the real-time collected operating parameter data with their respective preset normal ranges one by one. When any parameter exceeds the normal range, it is determined that the parameter is in an abnormal state, and the anomaly type and occurrence time are recorded for subsequent alarm, tracing, and maintenance processing.

[0097] To reduce misjudgments caused by instantaneous fluctuations, the system also incorporates the parameter change trend within a continuous sampling period for auxiliary judgment. For example, if a parameter deviates briefly only at a single sampling moment but returns to normal in subsequent sampling, the trend can be used to determine whether it is a transient disturbance; and if the deviation persists and the trend continues to worsen, the anomaly can be further confirmed. Through this dual judgment method of "threshold comparison + trend assistance," the system can promptly detect real anomalies while avoiding unnecessary interlocking actions triggered frequently by short-term interference.

[0098] In another embodiment, the system further includes a remote communication module, an alarm module, and a multi-well coordination control module;

[0099] The remote communication module is used to transmit operating parameter data and control commands between the brine well site and the remote monitoring center.

[0100] The alarm module is used to issue alarm information when an abnormal state is detected. The alarm information includes the abnormality type, abnormal parameter value and occurrence time.

[0101] The multi-well coordination control module is used to perform unified scheduling and linkage control based on the overall operating status of multiple brine wells. It also supports group management of multiple brine wells by region, generates batch control commands based on the operating parameter data of each brine well and preset scheduling strategies, and sends them to the linkage control module of each brine well through the remote communication module.

[0102] The preset scheduling strategy includes comprehensive scheduling based on well condition priority, load balancing, and risk suppression.

[0103] The working principle and beneficial effects of the above technical solution are as follows: Based on single-well control capabilities, the system can be expanded into a control architecture supporting multi-well collaborative management. The remote communication module is used to realize data interaction between the brine well site and the remote monitoring center, transmitting operating parameter data, alarm information, and control commands bidirectionally, enabling monitoring personnel to remotely monitor the operating status of each well and issue control commands.

[0104] The alarm module is used to issue alarm information when an abnormal state is detected. The alarm information includes the abnormality type, abnormal parameter value and occurrence time, so that on-site personnel and remote management terminals can quickly identify the source of the fault and the nature of the abnormality.

[0105] The multi-well coordination and control module is designed for the unified operation and management of multiple brine extraction wells. It performs comprehensive scheduling and coordinated control based on the real-time status of each well and preset scheduling strategies. The system can manage multiple brine extraction wells in groups by region, and generate batch control commands based on the operating parameters, load status, and risk status of each well. These commands are then sent to the corresponding well's coordinated control module via a remote communication module. Its scheduling strategy comprehensively considers well condition priority, load balancing, and risk mitigation. It prioritizes the operation of wells with stable conditions and critical production capacity, while also appropriately limiting, reducing, or protectively shutting down wells with excessive load or high risk, thereby improving the overall system's operational efficiency and safety margin.

[0106] In another embodiment, the alarm module has a hierarchical alarm mechanism, which includes two or more levels of early warning, alarm and emergency alarm.

[0107] When an abnormal state is detected, the alarm module determines the alarm level based on the type of abnormality, the duration of the abnormality, and the scope of the abnormality, and simultaneously sends the alarm information to the remote monitoring center and the on-site execution terminal, triggering the corresponding handling process based on the alarm information.

[0108] The working principle and beneficial effects of the above technical solution are as follows: The alarm module adopts a hierarchical alarm mechanism, classifying alarms into two or more levels—early warning, alert, and emergency alarm—based on the severity of the anomaly. After detecting an abnormal state, the linkage control module further combines the anomaly type, duration, and scope of impact to conduct a comprehensive evaluation, thereby determining the corresponding alarm level.

[0109] For example, a warning can be triggered when parameters slightly deviate from the normal range but do not pose a direct threat to system safety; an alarm can be triggered when the anomaly persists and may affect operational stability; and an emergency alarm is triggered when the anomaly clearly endangers the safe operation of the brine well. Alarm information is simultaneously sent to both the remote monitoring center and the on-site execution terminal, ensuring that both on-site and remote personnel are aware of the anomaly. At the same time, the system triggers corresponding handling procedures based on the alarm level, such as prompting for manual confirmation, limiting operating load, executing protective shutdown, or initiating emergency response procedures, thus forming a complete closed loop from monitoring and alarm to handling.

[0110] In another embodiment, the linkage control module is also configured with linkage protection control logic, which is used to perform gradual opening and gradual closing control on the freshwater injection valve during the start-up and shutdown of the brine pump, and to perform delayed shutdown after the pump stops.

[0111] The working principle and beneficial effects of the above technical solution are as follows: The linkage protection control logic is mainly used for smooth transition control during the start-up and shutdown phases of the brine pump. Since the start-up and shutdown process of the brine pump is usually accompanied by sudden changes in fluid state and pressure disturbances, the system does not simply open or close the freshwater injection valve instantaneously during the start-up and shutdown process, but instead performs gradual opening and gradual closing control.

[0112] When the brine extraction pump starts up, the freshwater injection valve opens gradually according to the linkage logic, allowing the fluid to enter a stable transition state. Then, based on the injection flow feedback, it gradually adjusts to the target opening. When the brine extraction pump stops, the valve does not immediately shut off but first performs a gradual closing action to release operating stress in the pipeline and reduce pressure surges. After the pump stops, the system then performs a delayed shutdown according to the linkage logic, ensuring the valve is finally closed after the pump unit has completely ceased operation, thereby further reducing the risks of backflow, reverse flow, and transient shocks. This coordinated protection control logic and process interlocking logic make the start-up and shutdown process of the brine extraction well smoother, and also improve equipment lifespan and operational reliability.

[0113] In another embodiment, such as Figure 2 As shown, a valve-pump linkage safety control method for brine wells applied in a system includes:

[0114] S1: Collect the operating parameter data of the brine well through the data acquisition module. The operating parameter data includes brine well liquid level data, fresh water injection flow rate data, pipeline pressure data and medium temperature data.

[0115] S2: The linkage control module receives operating parameter data and executes valve-pump linkage safety control logic based on the operating parameter data. The valve-pump linkage safety control logic includes process interlock logic and safety interlock logic.

[0116] S3: The execution module controls the start and stop of the brine pump and the opening, closing and opening degree adjustment of the freshwater injection valve according to the control commands output by the linkage control module;

[0117] S4: During the start-up of the brine pump, valve pre-opening and flow closed-loop regulation are performed; during the stop-up of the brine pump, valve shut-off control is performed.

[0118] S5: When an abnormality is detected in the brine well equipment, the safety interlock action of stopping the pump and closing the valve is executed first, and the alarm information is output to the remote monitoring center.

[0119] The working principle and beneficial effects of the above technical solution are as follows: The data acquisition module collects real-time operating parameters of the brine well, including brine well level data, freshwater injection flow rate data, pipeline pressure data, and medium temperature data. Various sensors are deployed at key locations at the wellhead, freshwater injection pipeline, and brine extraction pipeline to ensure timely reflection of changes in well conditions and pipeline status.

[0120] After receiving the operating parameter data, the linkage control module makes a comprehensive judgment based on the process interlock logic and safety interlock logic. Under normal circumstances, the system sequentially controls the brine pump and freshwater injection valve according to the pump start-up conditions, pump stop conditions, and valve status; when an abnormal state occurs, the system immediately prioritizes the safety interlock processing procedure.

[0121] The execution module executes the start-up and shutdown of the brine pump and the opening and closing of the freshwater injection valve according to the control commands output by the linkage control module. The pump action and valve action are coordinated in a predetermined linkage sequence to avoid uncoordinated states such as the pump starting first and the valve opening later, or the pump stopping first and the valve closing later, thereby reducing the risk of impact and failure.

[0122] During the start-up of the brine pump, the system first performs valve pre-opening, and then performs flow closed-loop regulation to ensure a smooth freshwater injection process. During the stop-up of the brine pump, the system first performs valve shut-off control, and then completes the linkage termination after the pump stops to avoid instability caused by instantaneous changes in the medium.

[0123] When the linkage control module detects an anomaly in the brine well equipment, the system will not continue to execute the original process interlocks. Instead, it will immediately execute the safety interlock actions of stopping the pump and closing the valves. At the same time, it will output alarm information to the remote monitoring center through the alarm module. The alarm content includes the anomaly type, the anomaly parameter value, and the time of occurrence, which will help remote personnel to promptly determine the cause of the anomaly and take subsequent measures.

[0124] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from the spirit and scope of this invention.

Claims

1. A valve-pump linkage safety control system for brine wells, characterized in that, include: The data acquisition module is used to collect the operating parameter data of the brine well, including brine well liquid level data, freshwater injection flow rate data, pipeline pressure data, and medium temperature data. The linkage control module is used to receive operating parameter data and execute valve-pump linkage safety control logic based on the operating parameter data. The valve-pump linkage safety control logic includes process interlock logic and safety interlock logic. The execution module is used to control the start and stop of the brine pump and the opening, closing and opening degree adjustment of the freshwater injection valve according to the control commands output by the linkage control module; Among them, the process interlock logic is used to control the freshwater injection valve to open and adjust the flow rate according to the preset linkage sequence during the brine pump startup process, and to control the freshwater injection valve to close according to the preset linkage sequence during the brine pump shutdown process. The safety interlock logic is used to control the brine pump to stop running and simultaneously control the freshwater injection valve to close when an abnormality is detected in the brine well equipment, so as to realize the linkage protection during the operation of the brine well.

2. The valve-pump linkage safety control system for brine wells according to claim 1, characterized in that, The data acquisition module includes a level sensor, a flow sensor, a pressure sensor, and a temperature sensor; The liquid level sensor is installed at the wellhead of the brine well to detect the liquid level in the brine well in real time and output the liquid level data; The flow sensor is installed in the freshwater injection pipeline to detect the freshwater injection flow rate and output flow data; The pressure sensor is installed in the brine extraction pipeline to detect the pressure of the medium inside the pipeline and output pressure data; Temperature sensors are installed in the brine extraction pipeline to detect the temperature of the medium and output temperature data.

3. The valve-pump linkage safety control system for brine wells according to claim 1, characterized in that, The process interlocking logic includes: When the preset pump start-up conditions are met, the linkage control module outputs a pump start-up command to the execution module to start the brine pump. Before or during the start-up of the brine pump, it outputs a valve pre-opening command to make the freshwater injection valve be in the initial linkage opening degree. The opening degree of the freshwater injection valve is dynamically adjusted according to the freshwater injection flow rate data in the operating parameter data. When the preset pump stop conditions are met, the linkage control module outputs a pump stop command to the execution module to stop the brine pump, and outputs a valve shut-off command before or during the stopping process of the brine pump to control the freshwater injection valve to close in the linkage sequence. Among them, the preset pump start-up conditions and preset pump stop-up conditions include a combination of at least one or more parameters based on the brine well level, pipeline pressure, medium temperature and valve status.

4. The valve-pump linkage safety control system for brine wells according to claim 1, characterized in that, The safety interlock logic includes: The linkage control module monitors operating parameter data in real time and triggers a safety interlock when any of the following abnormal conditions are detected: The pipeline pressure exceeds the preset safe pressure range, the brine well level exceeds the preset safe level range, the medium temperature exceeds the preset safe temperature range, the fresh water injection flow rate is abnormal, or the brine pump operating parameters are abnormal. After the safety interlock is triggered, the linkage control module outputs a pump stop command and a valve close command to the execution module, controlling the brine pump to stop running and controlling the freshwater injection valve to close, while simultaneously outputting an alarm signal; Among them, the priority of safety interlock logic is higher than that of process interlock logic.

5. The valve-pump linkage safety control system for brine wells according to claim 3, characterized in that, The linkage control module uses a PID control strategy to dynamically adjust the opening of the freshwater injection valve. The PID control strategy uses a preset flow rate setpoint as the input target value and the freshwater injection flow rate data in the operating parameter data as the feedback value. The valve opening control signal is output to the execution module through PID calculation. The execution module adjusts the opening of the freshwater injection valve according to the valve opening control signal so that the actual injection flow rate tracks the flow rate setpoint.

6. The valve-pump linkage safety control system for brine wells according to claim 1, characterized in that, The linkage control module is also used to detect anomalies in operating parameter data. Anomaly detection includes: The real-time collected operating parameter data is compared with its corresponding preset normal range. When any operating parameter data exceeds its corresponding preset normal range, it is determined to be an abnormal state, and the abnormality type and occurrence time are recorded. Anomaly detection also includes auxiliary judgment based on parameter change trends within a continuous sampling period to reduce misjudgments caused by instantaneous fluctuations.

7. The valve-pump linkage safety control system for brine wells according to claim 1, characterized in that, The system also includes a remote communication module, an alarm module, and a multi-well coordinated control module; The remote communication module is used to transmit operating parameter data and control commands between the brine well site and the remote monitoring center. The alarm module is used to issue alarm information when an abnormal state is detected. The alarm information includes the abnormality type, abnormal parameter value and occurrence time. The multi-well coordination control module is used to perform unified scheduling and linkage control based on the overall operating status of multiple brine wells. It also supports group management of multiple brine wells by region, generates batch control commands based on the operating parameter data of each brine well and preset scheduling strategies, and sends them to the linkage control module of each brine well through the remote communication module. The preset scheduling strategy includes comprehensive scheduling based on well condition priority, load balancing, and risk suppression.

8. The valve-pump linkage safety control system for brine wells according to claim 7, characterized in that, The alarm module has a hierarchical alarm mechanism, which includes two or more levels of early warning, alarm, and emergency alarm. When an abnormal state is detected, the alarm module determines the alarm level based on the type of abnormality, the duration of the abnormality, and the scope of the abnormality, and simultaneously sends the alarm information to the remote monitoring center and the on-site execution terminal, triggering the corresponding handling process based on the alarm information.

9. The valve-pump linkage safety control system for brine wells according to claim 1, characterized in that, The linkage control module is also equipped with linkage protection control logic, which is used to perform gradual opening and closing control of the freshwater injection valve during the start-up and shutdown of the brine pump, and to perform delayed shutdown after the pump stops.

10. A valve-pump linkage safety control method for brine wells applied to the system of any one of claims 1 to 9, characterized in that, include: S1: Collect the operating parameter data of the brine well through the data acquisition module. The operating parameter data includes brine well liquid level data, fresh water injection flow rate data, pipeline pressure data and medium temperature data. S2: The linkage control module receives operating parameter data and executes valve-pump linkage safety control logic based on the operating parameter data. The valve-pump linkage safety control logic includes process interlock logic and safety interlock logic. S3: The execution module controls the start and stop of the brine pump and the opening, closing and opening degree adjustment of the freshwater injection valve according to the control commands output by the linkage control module; S4: During the start-up of the brine pump, valve pre-opening and flow closed-loop regulation are performed; during the stop-up of the brine pump, valve shut-off control is performed. S5: When an abnormality is detected in the brine well equipment, the safety interlock action of stopping the pump and closing the valve is executed first, and the alarm information is output to the remote monitoring center.

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