A hydraulic blowout preventer monitoring method, device and storage medium

Abstract

The present application relates to the technical field of oil and gas drilling well control safety, and discloses a hydraulic blowout preventer monitoring method, device and storage medium, comprising obtaining hydraulic flow data in the opening hydraulic pipeline and / or closing hydraulic pipeline of the hydraulic blowout preventer, whether the hydraulic flow data is normal; based on the hydraulic flow data, judging whether the hydraulic blowout preventer completes the closing or opening operation, whether the closing or opening is normal; when judging that the hydraulic blowout preventer completes the closing operation, obtaining the air pressure data associated with the air path for controlling the brake of the drilling machine; judging whether the air pressure data is lower than the safety threshold; if the air pressure data is lower than the safety threshold, generating and outputting the first alarm signal indicating the brake failure. The present application can verify the well closing state and the brake effectiveness, and timely alarm when the safety interlock is abnormally released, so as to fundamentally eliminate the lifting of drilling accidents caused by state misjudgment or human negligence, and solve the problem that the safety state cannot be monitored.

Description

Technical Field

[0001] This invention relates to the field of well control safety technology in oil and gas drilling and production, specifically to a method, device, and storage medium for monitoring hydraulic blowout preventers. Background Technology

[0002] In oil and gas drilling operations, hydraulic blowout preventers (BOPs) are crucial safety devices for controlling wellhead pressure and preventing blowout accidents. To prevent drill string breakage due to misoperation when lifting the drill string after the hydraulic BOP is closed, a lift-off prevention device is currently used. Its working principle is as follows: when the operator issues a command to close the hydraulic BOP, the pressure change in the hydraulic system triggers a pneumatic valve, allowing compressed air to enter the drill rig's brake cylinder, thereby locking the brake and preventing the drill rig's lifting system from operating. This solution provides a basic level of safety assurance.

[0003] Existing anti-blowout devices have the following problems: they only implement a simple mechanical linkage function and cannot monitor whether the hydraulic blowout preventer (BOP) has actually completed its closing action. If the gate is not fully closed due to faults such as gate jamming or hydraulic leakage, but the closing command has been issued, the brake will still be triggered. More importantly, when the drill string needs to be moved after the well is shut in, the operator will press the air shut-off valve to release the brake. At this time, the traditional anti-blowout device becomes completely ineffective. If the operator forgets to restore the air supply after moving the drill string (i.e., the air shut-off valve remains open) and directly pulls up the drill string without opening the hydraulic BOP, the system will not provide any warning, ultimately leading to a major accident where the drill string breaks during lifting.

[0004] Based on the above situation, there is an urgent need for a method, device, and storage medium for monitoring hydraulic blowout preventers to solve the problem of the inability to monitor the safety status. Summary of the Invention

[0005] The purpose of this invention is to address the problem that existing anti-blowout devices cannot monitor whether the hydraulic blowout preventer itself has truly completed the closing action, i.e., they cannot monitor the safety status. This invention solves the problem of not being able to monitor the safety status.

[0006] The technical solution of the present invention is as follows: Firstly, a method for monitoring a hydraulic blowout preventer is provided, including: Acquire hydraulic flow data in the hydraulic lines for opening and / or closing of the hydraulic blowout preventer; Based on the hydraulic flow data, it is determined whether the hydraulic blowout preventer has completed the closing or opening operation; When it is determined that the hydraulic blowout preventer has completed the closing operation, the air pressure data associated with the air circuit controlling the drilling rig brake is acquired; If the air pressure data is lower than the safety threshold, a first alarm signal indicating brake failure is generated and output.

[0007] Existing blowout preventer (BOP) devices cannot monitor whether the hydraulic BOP has truly completed its closing action, i.e., they cannot monitor the safety status. This solution, however, first confirms the gate's closure based on hydraulic flow, then verifies the effectiveness of the brake air pressure, achieving intelligent and closed-loop control of the safety interlock. This fundamentally solves the fatal safety hazard of drill string breakage due to manual release of the brake after well shut-in and subsequent forgetting to restore it. Monitoring is upgraded from passive mechanical linkage to proactive, sensor-data-based decision-making, verifying the well shut-in status and brake effectiveness, and providing timely alarms when the safety interlock is abnormally released. This fundamentally eliminates drill string breakage accidents caused by misjudgment of status or human negligence, resolving the problem of the inability to monitor the safety status.

[0008] Furthermore, to more accurately determine whether the hydraulic blowout preventer has completed the closing operation, one feasible solution is to determine whether the hydraulic blowout preventer has completed the closing operation by: Monitor whether the hydraulic flow data reaches a stable extreme value, and continue for a preset first time period; If so, it is determined that the hydraulic blowout preventer has completed the shutdown operation.

[0009] When this solution is adopted, by monitoring the hydraulic flow data to remain stable at extreme values ​​for a period of time, the instantaneous fluctuations of the hydraulic system can be effectively filtered out, which greatly improves the anti-interference and accuracy of the status judgment, avoids false alarms or safety function failures caused by misjudgment, and enhances the reliability of the system.

[0010] Furthermore, to facilitate real-time monitoring of the internal workings of the hydraulic blowout preventer, one feasible solution is to: after acquiring the hydraulic flow data, execute: Based on the hydraulic flow data during the gate closing or opening process, diagnose what abnormal operating conditions the hydraulic blowout preventer is experiencing. If any abnormal operating condition is diagnosed, a second alarm signal corresponding to that abnormal operating condition will be generated and output.

[0011] This approach overcomes the bottleneck of existing technologies that cannot monitor the internal working conditions of hydraulic blowout preventers in real time, enabling early diagnosis and warning of potential faults. It transforms safety management from reactive remediation to proactive prevention, significantly enhancing the active safety of the well control system.

[0012] Furthermore, to diagnose potential abnormal operating conditions that may occur during the shutdown process of the hydraulic blowout preventer, one feasible solution is to perform the following during the shutdown process: Compare the first oil quantity with the maximum capacity threshold of the hydraulic blowout preventer output line; If the sum of the first oil quantity and the correction value is less than the maximum capacity threshold, and the duration exceeds the preset second time period, it is diagnosed as gate jamming or leakage in the closed oil pipeline. If the sum of the first oil quantity and the correction value is greater than the maximum capacity threshold and continues to increase, then it is diagnosed as piston malfunction.

[0013] When using this solution, different flow characteristics can effectively distinguish between mechanical jamming / external leakage and internal piston seal failure (such as cylinder misalignment), which helps maintenance personnel quickly locate the fault point, shorten maintenance time, and reduce unplanned downtime.

[0014] Furthermore, to diagnose any abnormal operating conditions that may occur during the opening of the hydraulic blowout preventer, one feasible solution is to perform the following during the opening process: Compare the second oil quantity in the hydraulic blowout preventer input line with the maximum capacity threshold; If the sum of the second oil quantity and the correction value stops changing before reaching the maximum capacity threshold, and the duration exceeds the preset third time period, then the gate is diagnosed as stuck. If the sum of the second oil quantity and the correction value exceeds the maximum capacity threshold and continues to increase, it is diagnosed as an open oil line leak, a side door leak, or piston cylinder malfunction.

[0015] When this solution is adopted, it can identify mechanical jamming during opening and further indicate whether it is an external pipeline leak or a leak in the side door seal of the hydraulic blowout preventer. Combined with the diagnostic methods mentioned above during the closing process, it enables monitoring of the health status of the hydraulic blowout preventer throughout its entire operating cycle.

[0016] Furthermore, to improve adaptability, one feasible approach is to perform initial calibration and set diagnostic thresholds after the device is first enabled or maintained.

[0017] When this approach is adopted, the impact of individual differences (such as different hydraulic blowout preventer models and wear levels) is reduced through initial calibration, laying the foundation for subsequent accurate diagnosis and improving adaptability.

[0018] Furthermore, this solution does not exclusively limit the specific steps of initialization calibration. One feasible solution is: the initialization calibration and setting of diagnostic thresholds includes: The hydraulic blowout preventer shall be controlled to perform at least three complete switching cycles; Record the maximum flow rate value collected in each loop; Based on the recorded maximum flow rates, calculate and set the flow rate threshold range for subsequent operational condition diagnostics.

[0019] When this approach is adopted, multiple samplings and calculations of the threshold range make the set diagnostic criteria closer to the actual operating state of the equipment, avoiding misdiagnosis that may occur due to the use of fixed thresholds, and further improving diagnostic accuracy and the system's adaptability.

[0020] Furthermore, the initial calibration and setting of the travel error value also includes: The maximum flow rate value for multiple shutdown and startup operations will be used as the shutdown and startup flow rate reference values, respectively. The travel error value is determined by taking the difference between the maximum and minimum flow values ​​from multiple closing and opening operations.

[0021] When this scheme is adopted, by determining the travel error value, a quantitative and personalized tolerance standard is provided for judging whether the gate is in the correct position. This makes the detection of minor abnormalities such as incomplete switching more precise and accurate, and helps to discover early signs of failure.

[0022] Secondly, a hydraulic blowout preventer monitoring device is provided for performing the above-mentioned monitoring method, including: The flow detection module is used to acquire hydraulic flow data in the hydraulic lines for opening and / or closing the hydraulic lines of the hydraulic blowout preventer. The air pressure detection module is used to acquire air pressure data associated with the air circuit that controls the drilling rig brake; The processing module is used to receive hydraulic flow data and air pressure data, and then diagnose whether there is any abnormal working condition. If any abnormal working condition is diagnosed, a corresponding alarm signal is generated. An alarm module is communicatively connected to the processing module. The alarm module is used to receive alarm signals and perform corresponding alarm operations.

[0023] Thirdly, a computer-readable storage medium is provided, on which a control program is stored, which, when executed by a processor, implements the above-described monitoring method.

[0024] Compared with existing technologies, the advantages of this invention are: I. By first confirming the gate is closed based on hydraulic flow and then verifying the effectiveness of the brake air pressure, intelligent and closed-loop control of the safety interlock is achieved. This fundamentally solves the fatal safety hazard of drill string breakage due to manual release of the brake after well shut-in and forgetting to restore it: monitoring is upgraded from passive mechanical linkage to active decision-making based on sensor data, which can verify the well shut-in status and brake effectiveness, and can promptly alarm when the safety interlock is abnormally released, thereby fundamentally eliminating drill string breakage accidents caused by misjudgment of status or human negligence, and solving the problem of not being able to monitor the safety status; Second, by using different flow characteristics, it is possible to effectively distinguish several abnormal operating conditions that may exist during the opening and closing of the hydraulic blowout preventer, which facilitates the guidance of maintenance personnel to quickly locate the fault point, shorten the maintenance time, and reduce unplanned downtime; Third, initial calibration and diagnostic threshold setting are performed after the equipment is first used or maintained. Initial calibration reduces the impact of individual differences, lays the foundation for accurate subsequent diagnosis, and improves adaptability. Attached Figure Description

[0025] Figure 1 A flowchart of a hydraulic blowout preventer monitoring method provided in Embodiment 1 of the present invention; Figure 2 A flowchart of the hydraulic blowout preventer monitoring process provided in Embodiment 1 of the present invention; Figure 3 A flowchart for the diagnostic process of the hydraulic blowout preventer closing, provided in Embodiment 1 of the present invention; Figure 4 A flowchart for diagnosing the hydraulic blowout preventer opening process provided in Embodiment 1 of the present invention; Figure 5 This is an initialization calibration flowchart provided for Embodiment 1 of the present invention; Figure 6 The overall logic diagram provided for Embodiment 1 of the present invention.

[0026] Figure 7 This is a schematic diagram of a hydraulic blowout preventer monitoring device provided in Embodiment 2 of the present invention.

[0027] Figure label: 100. Flow detection module; 200. Air pressure detection module; 300. Processing module; 400. Alarm module; 110. Hydraulic blowout preventer; 111. Output pipeline; 112. Input pipeline; 210. Drilling rig brake; 220. Air circuit; 230. Air source. Detailed Implementation

[0028] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variations thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0029] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0030] Example: Please refer to Figure 1 A method for monitoring a hydraulic blowout preventer, comprising: S100: Obtain hydraulic flow data in the hydraulic lines for opening and / or closing of the hydraulic blowout preventer. S200: Based on hydraulic flow data, determine whether the hydraulic blowout preventer has completed the closing or opening operation; S300: When it is determined that the hydraulic blowout preventer has completed the closing operation, acquire the air pressure data associated with the air circuit controlling the drilling rig brake; S400: If the air pressure data is lower than the safety threshold, a first alarm signal indicating brake failure will be generated and output.

[0031] Existing blowout preventer (BOP) devices cannot monitor whether the hydraulic BOP has truly completed its closing action, i.e., they cannot monitor the safety status. This solution, however, first confirms the gate's closure based on hydraulic flow, then verifies the effectiveness of the brake air pressure, achieving intelligent and closed-loop control of the safety interlock. This fundamentally solves the fatal safety hazard of drill string breakage due to manual release of the brake after well shut-in and subsequent forgetting to restore it. Monitoring is upgraded from passive mechanical linkage to proactive, sensor-data-based decision-making, verifying the well shut-in status and brake effectiveness, and providing timely alarms when the safety interlock is abnormally released. This fundamentally eliminates drill string breakage accidents caused by misjudgment of status or human negligence, resolving the problem of the inability to monitor the safety status.

[0032] Reference Figure 2 To more accurately determine whether the hydraulic blowout preventer has completed the closing operation, one feasible solution is to determine whether the hydraulic blowout preventer has completed the closing operation, including: S210, Monitor whether the hydraulic flow data reaches a stable extreme value and continue for the preset first time period; S220. If yes, then the hydraulic blowout preventer has completed the shut-off operation.

[0033] When this solution is adopted, by monitoring the hydraulic flow data to remain stable at extreme values ​​for a period of time, the instantaneous fluctuations of the hydraulic system can be effectively filtered out, which greatly improves the anti-interference and accuracy of the status judgment, avoids false alarms or safety function failures caused by misjudgment, and enhances the reliability of the system.

[0034] To facilitate real-time monitoring of the internal workings of the hydraulic blowout preventer, one feasible solution is to: after acquiring the hydraulic flow data, execute: S230. Based on hydraulic flow data during the gate closing or opening process, diagnose what abnormal operating conditions occur in the hydraulic blowout preventer. S240. If any abnormal operating condition is diagnosed, a second alarm signal corresponding to the abnormal operating condition is generated and output.

[0035] This approach overcomes the bottleneck of existing technologies that cannot monitor the internal working conditions of hydraulic blowout preventers in real time, enabling early diagnosis and warning of potential faults. It transforms safety management from reactive remediation to proactive prevention, significantly enhancing the active safety of the well control system.

[0036] Reference Figure 3 To diagnose potential abnormal conditions that may occur during the shutdown process of a hydraulic blowout preventer, one feasible solution is to perform the following during the shutdown process: S231. Compare the first oil quantity with the maximum capacity threshold of the hydraulic blowout preventer output line. S232. If the sum of the first oil quantity and the correction value is less than the maximum capacity threshold, and the duration exceeds the preset second time period, it is diagnosed as gate jamming or leakage of the closed oil pipeline. S233. If the sum of the first oil quantity and the correction value is greater than the maximum capacity threshold and continues to increase, then it is diagnosed as piston malfunction.

[0037] When using this solution, different flow characteristics can effectively distinguish between mechanical jamming / external leakage and internal piston seal failure (such as cylinder misalignment), which helps maintenance personnel quickly locate the fault point, shorten maintenance time, and reduce unplanned downtime.

[0038] Reference Figure 4 To diagnose potential abnormal conditions that may occur during the opening of the hydraulic blowout preventer, one feasible solution is to perform the following during the opening process: S234. Compare the second oil quantity in the hydraulic blowout preventer input line with the maximum capacity threshold. S235. If the sum of the second oil quantity and the correction value stops changing before reaching the maximum capacity threshold, and the duration exceeds the preset third time period, then the gate is diagnosed as stuck. S236. If the sum of the second oil quantity and the correction value exceeds the maximum capacity threshold and continues to increase, it is diagnosed as an open oil line leak, side door leak, or piston cylinder malfunction.

[0039] When this solution is adopted, it can identify mechanical jamming during opening and further indicate whether it is an external pipeline leak or a leak in the side door seal of the hydraulic blowout preventer. Combined with the diagnostic methods mentioned above during the closing process, it enables monitoring of the health status of the hydraulic blowout preventer throughout its entire operating cycle.

[0040] Reference Figure 5 To improve adaptability, one feasible solution is to perform S500 initialization calibration and set diagnostic thresholds after the device is first enabled or maintained.

[0041] When this approach is adopted, the impact of individual differences (such as different hydraulic blowout preventer models and wear levels) is reduced through initial calibration, laying the foundation for subsequent accurate diagnosis and improving adaptability.

[0042] This solution does not exclusively limit the specific steps of initialization calibration. One feasible solution is to perform initialization calibration and set diagnostic thresholds, including: S510, Control the hydraulic blowout preventer to perform at least three complete switching cycles; S520: Record the maximum flow rate value collected in each loop; S530: Based on the recorded maximum flow rates, calculate and set the flow rate threshold range for subsequent operational condition diagnostics.

[0043] When this approach is adopted, multiple samplings and calculations of the threshold range make the set diagnostic criteria closer to the actual operating state of the equipment, avoiding misdiagnosis that may occur due to the use of fixed thresholds, and further improving diagnostic accuracy and the system's adaptability.

[0044] The initial calibration and diagnostic threshold setting also include: S540, Use the maximum flow rate value of multiple shutdown and startup operations as the reference value for the maximum travel flow rate during shutdown and startup, respectively; S550: Based on the maximum flow rate value from multiple shutdown and startup operations, the difference between the maximum and minimum values ​​is used to determine the travel error value.

[0045] When this scheme is adopted, by determining the stroke error value, a quantitative and personalized tolerance standard is provided for judging whether the gate is in the correct position. This makes the detection of minor abnormalities such as incomplete switching more precise and accurate, and helps to discover early signs of failure. Specifically, in this embodiment, the maximum flow rate value of the opening or closing operation is used as the maximum capacity threshold.

[0046] Optionally, in this embodiment, the travel error value is used as the correction value.

[0047] Reference Figure 6 The overall logic diagram of this embodiment is provided.

[0048] Example 2: Reference Figure 7 A hydraulic blowout preventer monitoring device, used to perform the above-mentioned monitoring method, comprising: Flow detection module 100 is used to acquire hydraulic flow data in the opening hydraulic line 111 and / or closing hydraulic line 112 of the hydraulic blowout preventer 110; The air pressure detection module 200 is used to acquire air pressure data associated with the air circuit 220 that controls the drilling rig brake 210. The air circuit 220 is connected to the air source 230. The processing module 300 is used to receive hydraulic flow data and air pressure data, and then diagnose whether there is an abnormal working condition. If any abnormal working condition is diagnosed, a corresponding alarm signal is generated. The alarm module 400 is communicatively connected to the processing module 300. The alarm module 400 is used to receive alarm signals and execute corresponding alarm operations.

[0049] The working principle of this embodiment: A hydraulic motor is connected in series on the output line 111 and input line 112 of the hydraulic blowout preventer 110. The hydraulic motor is equipped with a flow detection module 100, which monitors the hydraulic oil flow data in real time and transmits the data to the processing module 300. The program in the processing module 300 determines the operating status of the hydraulic blowout preventer 110 based on flow changes: the flow should be stable at zero when normally closed; if the flow is abnormal, faults such as gate jamming, pipeline leakage, or piston malfunction are diagnosed. Simultaneously, the pressure detection module 200 monitors the pressure in the air circuit 220 of the drilling rig brake 210; when the hydraulic blowout preventer 110 is closed, if the detected air pressure value is lower than the safety threshold, the brake is deemed to have failed, and the alarm module 400 is immediately triggered to activate an audible and visual alarm. Through real-time flow and pressure monitoring, the operating condition of the hydraulic blowout preventer 110 is diagnosed and safety interlock alarms are established, effectively preventing well control accidents.

[0050] Optionally, in this embodiment, the processing module 300 adopts a high-performance ARM A7 series processor, which significantly improves data computing capabilities and system response speed, providing a solid foundation for complex task processing and multi-task parallel operation; the alarm module 400 includes an LCD high-definition screen, supporting richer information display and more intuitive graphical interaction, significantly improving user experience and operational efficiency; the hydraulic motor is connected to an absolute encoder, achieving long-distance stable communication through an RS485 interface, possessing strong anti-interference capabilities, and ensuring data transmission reliability. The absolute encoder can accurately record the device status in real time, and the data is not lost after power failure, improving the traceability of system status and control accuracy.

[0051] Example 3: A computer-readable storage medium having a control program stored thereon, which, when executed by a processor, implements the above-described monitoring method.

[0052] To address the issue of the inability to monitor safety status, this solution first confirms the gate is closed based on hydraulic flow, then verifies the effectiveness of the brake air pressure, achieving intelligent and closed-loop control of the safety interlock. This fundamentally solves the fatal safety hazard of drill string breakage due to manual release of the brake after well shut-in and subsequent forgetting to restore it. Monitoring is upgraded from passive mechanical linkage to proactive, sensor-data-based decision-making, capable of verifying the well shut-in status and brake effectiveness, and providing timely alarms when the safety interlock is abnormally released. This fundamentally eliminates drill string breakage accidents caused by misjudgment of status or human negligence, resolving the problem of the inability to monitor safety status.

[0053] To facilitate the identification of abnormal operating conditions, this solution effectively distinguishes several abnormal operating conditions that may occur during the opening and closing of the hydraulic blowout preventer by using different flow characteristics. This helps maintenance personnel quickly locate the fault point, shorten maintenance time, and reduce unplanned downtime.

[0054] To mitigate the impact of individual differences, this solution performs initial calibration and sets diagnostic thresholds after the device is first used or maintained. This initial calibration reduces the influence of individual differences, laying the foundation for accurate subsequent diagnosis and improving adaptability.

[0055] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for monitoring a hydraulic blowout preventer, characterized in that, include: Acquire hydraulic flow data in the opening and / or closing hydraulic lines of the hydraulic blowout preventer; Based on the hydraulic flow data, it is determined whether the hydraulic blowout preventer has completed the closing or opening operation; After acquiring the hydraulic flow data, execute: Based on the hydraulic flow data during the gate closing or opening process, diagnose what abnormal operating conditions the hydraulic blowout preventer is experiencing. If any abnormal operating condition is diagnosed, a second alarm signal corresponding to that abnormal operating condition will be generated and output. During the hydraulic blowout preventer shutdown process, the following is executed: Compare the first oil quantity with the maximum capacity threshold of the hydraulic blowout preventer output line; If the sum of the first oil quantity and the correction value is less than the maximum capacity threshold, and the duration exceeds the preset second time period, it is diagnosed as gate jamming or leakage in the closed oil pipeline. If the sum of the first oil quantity and the correction value is greater than the maximum capacity threshold and continues to increase, it is diagnosed as piston malfunction. During the opening of the hydraulic blowout preventer, the following is executed: Compare the second oil quantity in the hydraulic blowout preventer input line with the maximum capacity threshold; If the sum of the second oil quantity and the correction value stops changing before reaching the maximum capacity threshold, and the duration exceeds the preset third time period, then the gate is diagnosed as stuck. If the sum of the second oil quantity and the correction value exceeds the maximum capacity threshold and continues to increase, it is diagnosed as an open oil line leak, a side door leak, or a piston cylinder malfunction. When it is determined that the hydraulic blowout preventer has completed the closing operation, the air pressure data associated with the air circuit controlling the drilling rig brake is acquired; If the air pressure data is lower than the safety threshold, a first alarm signal indicating brake failure is generated and output. After the equipment is first started or maintained, perform initial calibration and set the travel error value; The initial calibration and setting of the travel error value include: The hydraulic blowout preventer shall be controlled to perform at least three complete switching cycles; Record the maximum flow rate value collected in each loop; Based on the recorded maximum flow rates, calculate and set the flow rate threshold range for subsequent operational condition diagnostics; The initial calibration and setting of the travel error value also includes: The maximum flow rate of multiple shutdown and startup operations will be used as the reference value for the maximum trip flow rate during shutdown and startup, respectively. The travel error value is determined by taking the difference between the maximum and minimum flow values ​​from multiple closing and opening operations.

2. The method for monitoring a hydraulic blowout preventer according to claim 1, characterized in that, Determining whether the hydraulic blowout preventer has completed the closing operation includes: Monitor whether the hydraulic flow data reaches a stable extreme value, and continue for a preset first time period; If so, it is determined that the hydraulic blowout preventer has completed the shutdown operation.

3. A hydraulic blowout preventer monitoring device, used to perform the monitoring method as described in any one of claims 1 to 2, characterized in that, include: The flow detection module is used to acquire hydraulic flow data in the hydraulic lines for opening and / or closing the hydraulic lines of the hydraulic blowout preventer. The air pressure detection module is used to acquire air pressure data associated with the air circuit that controls the drilling rig brake; The processing module is used to receive hydraulic flow data and air pressure data, and then diagnose whether there is any abnormal working condition. If any abnormal working condition is diagnosed, a corresponding alarm signal is generated. An alarm module is communicatively connected to the processing module. The alarm module is used to receive alarm signals and perform corresponding alarm operations.

4. A computer-readable storage medium having a control program stored thereon, characterized in that, When the control program is executed by the processor, it implements the monitoring method as described in any one of claims 1 to 2.

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