Wellhead control cabinet pressure monitoring system

Abstract

The utility model relates to the technical field of gas field production, concretely relates to a wellhead control cabinet pressure monitoring system, including pressure sensor and SCADA system, pressure sensor with SCADA system connects, pressure sensor connects in system pressure control pipeline, pressure sensor is used for detecting the barometric pressure of system pressure control pipeline and exports first signal, SCADA system is used for monitoring first signal and carries out abnormal pressure early warning according to first signal. Adopt the wellhead control cabinet pressure monitoring system that the utility model proposes, can realize real -time monitoring to each system pressure control pipeline in wellhead control cabinet on the basis of not changing original line.

Description

Technical Field

[0001] This utility model relates to the field of gas field production technology, and in particular to a wellhead control cabinet pressure monitoring system. Background Technology

[0002] Each gas field production station is equipped with a wellhead control cabinet to monitor pressures such as the wellhead oil pressure, casing pressure, and control cabinet system pressure. By controlling the automatic control valves of the wellhead, on-site production safety is ensured. Currently, all wellhead control cabinets at gas field stations use local pressure gauges to monitor the downhole safety valve pressure, surface safety valve pressure, and fusible plug pressure. Station personnel only check these pressures during daily inspections, judging the pressure situation based on the values ​​displayed on the local pressure gauges. The gas field adopts a "centralized monitoring, area-based inspection" model. Except for some stations with permanent inspection teams, most well stations are unattended most of the time. The pressure of each system in the control cabinet is only checked during the three daily inspections. Therefore, when abnormal pressure occurs in the control cabinet system, inspection personnel cannot detect and address it in a timely manner, posing certain safety hazards and affecting the safe production of the well stations. Utility Model Content

[0003] The purpose of this invention is to address the problem that existing field station wellhead control cabinets use local pressure gauges for pressure monitoring, which means that inspection personnel cannot promptly detect and handle abnormal pressure in the control cabinet system. This invention provides a wellhead control cabinet pressure monitoring system.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A wellhead control cabinet pressure monitoring system includes a pressure sensor and a SCADA system. The pressure sensor is connected to the SCADA system and is connected to the system pressure control pipeline. The pressure sensor is used to detect the gas pressure of the system pressure control pipeline and output a first signal. The SCADA system is used to monitor the first signal and provide an abnormal pressure warning based on the first signal.

[0005] This invention adds a pressure sensor to the original system pressure control pipeline, and transmits the data to the SCADA (Supervisory Control and Data Acquisition) system for remote real-time monitoring of the control cabinet system pressure. It also provides early warnings for abnormal pressure to ensure safe production in the gas field.

[0006] Preferably, the system pressure control pipeline is connected to the main valve, and the SCADA system includes a PLC controller, which is electrically connected to the main valve. The SCADA system controls the opening and closing of the main valve of the system pressure control pipeline through the PLC controller, thereby regulating the flow of the system pressure control pipeline. For example, when the SCADA system detects that the pressure value collected by the pressure sensor on a certain pipeline exceeds a set threshold range, it can send an open or closed control command to the main valve at a specific location through the PLC controller to release gas from the system pressure control pipeline for pressure relief, or to seal the system pressure control pipeline for easy maintenance.

[0007] Furthermore, the SCADA system also includes a server, the PLC controller is connected to the server, and the server is connected to a display terminal. The display terminal is used for remote monitoring and display.

[0008] Furthermore, the server includes a reading module and an early warning module. The reading module receives values ​​from the PLC controller, and the early warning module determines abnormal pressure based on the PLC controller values ​​and outputs an early warning signal to the display terminal, facilitating rapid response and judgment at the remote end. The early warning signal can be displayed via a pop-up window, or it can be sent via SMS notification or a buzzer alarm.

[0009] Preferably, the PLC controller is connected to the server via the 485 serial communication protocol, ensuring stable signal transmission and making it suitable for medium- to long-distance, high-speed remote communication scenarios.

[0010] Preferably, the display device is a computer or a mobile phone, etc.

[0011] Preferably, the wellhead control cabinet pressure monitoring system also includes an alarm, which is connected to the SCADA system. The alarm is used for site automation to facilitate rapid identification of risk sources. The SCADA system can control the alarm via wired or wireless means.

[0012] When the pressure value collected by the SCADA system exceeds the set threshold range, a control command can be sent to the on-site alarm to trigger an alarm, so as to promptly confirm the location of the control cabinet abnormality and handle potential hazards on-site, ensuring the safe production of the gas field station.

[0013] Preferably, the pressure sensor is a pressure transmitter, which is easy to use and can realize remote transmission function.

[0014] More preferably, the system pressure control pipeline is connected to a local pressure gauge, and the pressure transmitter is connected to the system pressure control pipeline through a tee interface, without changing the original pipeline setup, with minimal pipeline modification work and minimal impact on the original pipeline setup.

[0015] Preferably, the pressure sensors include a first pressure sensor, a second pressure sensor, and a third pressure sensor. The system pressure control pipeline includes a downhole safety valve pressure pipeline, a surface safety valve pressure pipeline, and a fusible plug pressure pipeline. The main valve includes a first main valve, a second main valve, and a third main valve. The first pressure sensor and the first main valve are both connected to the downhole safety valve pressure pipeline. The second pressure sensor and the second main valve are both connected to the surface safety valve pressure pipeline. The third pressure sensor and the third main valve are both connected to the fusible plug pressure pipeline. The first, second, and third pressure sensors are all connected to the same PLC controller, which facilitates integrated control and reduces the space occupied by the wellhead control cabinet.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: The wellhead control cabinet pressure monitoring system proposed in this utility model can monitor the pressure changes of the system pressure control pipeline in real time without changing the original pipeline settings. The signal transmission is stable, and the SCADA system can compare the collected pressure value with the threshold range set in the system to provide abnormal warnings and display them, thereby realizing remote monitoring and reducing safety hazards. Attached Figure Description

[0017] Figure 1 This is a schematic diagram showing the changes in the system pressure control pipeline configuration in Example 1; Figure 2 This is a schematic diagram of the structure of a wellhead control cabinet pressure monitoring system in Example 1; Figure 3 This is a structural diagram of a wellhead control cabinet pressure monitoring system with a multi-pipeline layout.

[0018] Icons: 1-Local pressure gauge; 11-First gauge head; 12-Second gauge head; 13-Third gauge head; 2-Pressure sensor; 21-First pressure sensor; 22-Second pressure sensor; 23-Third pressure sensor; 3-Main valve; 31-First main valve; 32-Second main valve; 33-Third main valve; 4-SCADA system; 5-Alarm; 6-System pressure control pipeline. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings.

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0021] Example 1 A certain gas field has a total of 34 production stations. Each station is equipped with a wellhead control cabinet, which is used to monitor the oil pressure, casing pressure and control cabinet system pressure of the gas production tree, and control the automatic control valves of the gas production tree to ensure on-site production safety.

[0022] Currently, all wellhead control cabinets at various gas field stations use local pressure gauges to monitor the pressure of downhole safety valves, surface safety valves, and fusible plugs. Station personnel only check these pressures during daily inspections, making real-time monitoring of the pressures within the control cabinets impossible. Furthermore, the lack of pressure anomaly warning systems hinders timely confirmation and handling of control cabinet malfunctions, impacting safe production at the station. To address the safety hazard posed by the inability to monitor downhole safety valve, surface safety valve, and fusible plug pressures in real-time within the wellhead control cabinets, this embodiment provides a wellhead control cabinet pressure monitoring system. This system adds a pressure transmitter suitable for the wellhead control cabinet to the system pressure control pipeline, transmitting data remotely to the SCADA system for real-time monitoring of the wellhead control cabinet system pressure. Simultaneously, it provides early warnings for abnormal pressures, ensuring safe production in the gas field.

[0023] Specifically, in this embodiment, such as Figure 1 , Figure 2 As shown, the wellhead control cabinet pressure monitoring system includes a pressure sensor 2 and a SCADA system 4, with the pressure sensor 2 and SCADA system 4 communicating with each other. The pressure sensor 2 is installed at a specific node of the system pressure control pipeline 6. The pressure sensor 2 is used to detect the gas pressure of the system pressure control pipeline 6 and output a first signal. The SCADA system 4 is used to monitor the first signal and issue an early warning for abnormal pressure based on the first signal.

[0024] In this embodiment, pressure sensor 2 uses a Rosemount three-way interface pressure transmitter. This pressure sensor 2 is suitable for pressure monitoring in natural gas station wellhead control cabinet systems. It is lightweight, corrosion-resistant, simple in structure, and easy to carry and install. The SCADA (Supervisory Control And Data Acquisition) system, also known as a data acquisition and monitoring control system, has an architecture that includes software and hardware. The SCADA system 4 can monitor and control on-site operating equipment, realizing functions such as data acquisition, equipment control, measurement, parameter adjustment, and various signal alarms. The SCADA system includes a PLC controller, a server, and a display terminal. The PLC controller is connected to the server, and the server is connected to the display terminal. The PLC controller is used for station control; the server is mainly responsible for storing and managing system data and processing control commands from the operator station. The SCADA server collects and analyzes data from various sensors and controllers by monitoring and controlling the industrial production process in real time, realizing real-time monitoring and remote control of the production process. In addition, the SCADA server also has data visualization capabilities, which can present the collected data in charts or other visual forms so that operators can better understand and analyze the production process. The display terminal is used for display and can be a computer or mobile phone, etc. In this embodiment, the server includes a reading module and an early warning module. The reading module is used to receive values ​​from the PLC controller, and the early warning module is used to determine abnormal pressure based on the values ​​from the PLC controller and output early warning signals to the display terminal, such as pop-up window prompts, so as to facilitate quick response and judgment at the remote end, timely location of abnormal pressure at the site, and timely notification of personnel near the site for handling.

[0025] The original system pressure control pipeline 6 is equipped with a main valve 3 and a local pressure gauge 1. The local pressure gauge 1, system pressure control pipeline 6, and main valve 3 are connected sequentially. The main valve 3 controls the on / off state and flow rate of system pressure control pipeline 6, which is used to transport gas from the station. A pressure transmitter (pressure sensor 2) is installed on system pressure control pipeline 6 via a tee port. The pressure transmitter is electrically connected to a PLC controller, and the PLC controller communicates with a SCADA server via a 485 serial communication protocol. This is suitable for medium-to-long-distance, high-speed remote communication scenarios, ensuring stable signal transmission. The pressure signal detected by the pressure transmitter is transmitted to the PLC controller, which converts it into a specific signal and relays it to the SCADA system 4 server. The SCADA system 4 then remotely acquires and monitors the data. This system monitors pressure changes in the system pressure control pipeline in real time without altering the original pipeline configuration, ensuring stable signal transmission.

[0026] Furthermore, alarms 5 are also installed near the monitoring points of each station. Alarms 5 are connected to the SCADA system 4. When the pressure value collected by the SCADA system 4 exceeds the set threshold range, a control command can be sent to alarm 5 to trigger an alarm, facilitating timely on-site confirmation of the control cabinet's abnormality and handling of potential hazards, ensuring safe production at the gas field station. Specifically, in this embodiment, a PLC controller is preferably used to control alarm 5. The PLC controller in this embodiment includes a comparator and a counter. The comparator is electrically connected to the counter, and the counter is electrically connected to the alarm. The comparator receives a first signal and compares the fluctuation of the first signal. If the fluctuation exceeds a set threshold A (e.g., A is 0.04 MPa), it outputs a second signal. The counter receives the second signal. Within a time period B (e.g., B is 1 to 5 seconds), if the counter receives the second signal Z times (e.g., Z is 8 times) or more, the counter outputs a third signal. Alternatively, in two adjacent time periods B, if the counter receives the second signal N times (e.g., N is 5 times) or more, the counter outputs a third signal. Alarm 5 receives the third signal and issues an alarm.

[0027] As an optional implementation, the PLC controller can also be electrically connected to the main valve 3. When the pressure value collected by the SCADA system 4 exceeds the set threshold range, the SCADA system 4 can send a control command to the main valve 3 through the PLC controller to drive the main valve 3 to adjust the flow rate of the system pressure control pipeline or control the opening and closing of the system pressure control pipeline. Operators can choose the appropriate method to reduce safety risks according to the needs of the scenario.

[0028] More specifically, in this embodiment, as Figure 3 As shown, the local pressure gauge 1 includes a first gauge head 11, a second gauge head 12, and a third gauge head 13; the pressure sensor 2 includes a first pressure sensor 21, a second pressure sensor 22, and a third pressure sensor 23; the system pressure control pipeline 6 includes a downhole safety valve pressure pipeline, a surface safety valve pressure pipeline, and a fusible plug pressure pipeline; the main valve 3 includes a first main valve 31, a second main valve 32, and a third main valve 33. The downhole safety valve pressure pipeline is sequentially connected to the first gauge head 11, the first pressure sensor 21, and the first main valve 31; the surface safety valve pressure pipeline is sequentially connected to the second gauge head 12, the second pressure sensor 22, and the second main valve 32; and the fusible plug pressure pipeline is sequentially connected to the third gauge head 13, the third pressure sensor 23, and the third main valve 33. The first pressure sensor 21, the second pressure sensor 22, and the third pressure sensor 23 are all electrically connected to the same PLC controller, facilitating integrated control and minimizing the space occupied by the wellhead control cabinet.

[0029] This embodiment adds a pressure sensor 2 to the original system pressure control pipeline 6. The pressure sensor 2 converts the detected pressure into an electrical signal, which is transmitted to the PLC controller in the cabinet via the control cabinet wiring box. The PLC controller then relays the signal to the SCADA system server to read the pressure values ​​of each level of the control cabinet system and perform centralized monitoring. This achieves real-time monitoring of the wellhead control cabinet system pressure. Simultaneously, the SCADA system 4 identifies and processes abnormal pressures, issuing warnings through the display terminal and on-site alarms. This ensures that on-duty personnel can promptly detect and handle abnormalities, guaranteeing the safety of the site's production. This solution is suitable for sites with wellhead control cabinets but no pressure transmitters.

[0030] Example 2 Based on Embodiment 1, this embodiment also provides a wellhead control cabinet pressure monitoring system. The main difference from Embodiment 1 lies in the signal transmission path and processing method: In this embodiment, the pressure sensor is connected to the server in the SCADA system 4, and the PLC controller is only connected to the alarm 5 and / or the main valve 3. The first signal collected by the pressure sensor is directly transmitted to the SCADA system in the monitoring center for storage and processing. Based on the processing result of the first signal, the SCADA system controls the PLC controller to drive the alarm 5 to sound an alarm and / or drive the main valve 3 to adjust the pressure of the system pressure control pipeline 6. The PLC controller is preferably located in the wellhead control cabinet.

[0031] The wellhead control cabinet pressure monitoring system proposed in this embodiment can also monitor the pressure changes of the system pressure control pipeline 6 in real time without changing the original pipeline settings, thus reducing safety hazards.

[0032] It should be noted that, unless otherwise specified, the use of terms such as "first," "second," and "third" in the description of specific embodiments of this utility model is merely for distinguishing descriptions of identical or similar components and should not be construed as emphasizing or implying the relative importance of specific components. Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set," "connected," "linked," "provided with," and "arranged" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wellhead control cabinet pressure monitoring system, characterized in that, Includes a pressure sensor (2) and a SCADA system (4). The pressure sensor (2) is connected to the SCADA system (4). The pressure sensor (2) is connected to the system pressure control line (6). The pressure sensor (2) is used to detect the air pressure of the system pressure control line (6) and output a first signal. The SCADA system (4) is used to monitor the first signal and provide an abnormal pressure warning based on the first signal. The system pressure control pipeline (6) is connected to the main valve (3), and the SCADA system (4) includes a PLC controller, which is electrically connected to the main valve (3). The pressure sensor (2) includes a first pressure sensor (21), a second pressure sensor (22) and a third pressure sensor (23). The system pressure control pipeline (6) includes a downhole safety valve pressure pipeline, a surface safety valve pressure pipeline and a fusible plug pressure pipeline. The main valve (3) includes a first main valve (31), a second main valve (32) and a third main valve (33). The first pressure sensor (21) and the first main valve (31) are both connected to the downhole safety valve pressure line; the second pressure sensor (22) and the second main valve (32) are both connected to the surface safety valve pressure line; and the third pressure sensor (23) and the third main valve (33) are both connected to the fusible plug pressure line. The first pressure sensor (21), the second pressure sensor (22), and the third pressure sensor (23) are all connected to the same PLC controller; The pressure sensor is a pressure transmitter. The system pressure control line (6) is connected to a local pressure gauge (1). The pressure transmitter is connected to the system pressure control line (6) through a three-way interface.

2. The wellhead control cabinet pressure monitoring system according to claim 1, characterized in that, The SCADA system (4) also includes a server, the PLC controller is connected to the server, and the server is connected to the display terminal.

3. The wellhead control cabinet pressure monitoring system according to claim 2, characterized in that, The server includes a reading module and an early warning module. The reading module is used to receive values ​​from the PLC controller, and the early warning module is used to determine abnormal pressure based on the values ​​from the PLC controller and output an early warning signal to the display terminal.

4. The wellhead control cabinet pressure monitoring system according to claim 2, characterized in that, The PLC controller is connected to the server via the 485 serial communication protocol.

5. A wellhead control cabinet pressure monitoring system according to claim 2, characterized in that, The display device is a computer or a mobile phone.

6. A wellhead control cabinet pressure monitoring system according to any one of claims 1-5, characterized in that, It also includes an alarm (5) connected to the SCADA system (4) and located at the site.

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