Intelligent controller for electric pump well

Abstract

The utility model belongs to the technical field of coalbed methane exploitation, particularly relates to an intelligent controller for an electric pump well, and aims to solve the problems that a traditional working fluid level detection method is low in precision, complex in operation and the like and cannot effectively adapt to the change of a working fluid level in coalbed methane production. The casing pressure sensor is mounted at a casing of an oil well and used for acquiring casing pressure data; the underground pressure sensor is mounted underground and is used for acquiring underground pressure data; the liquid level instrument is installed in the sleeve and used for obtaining liquid level height data, and the edge controller is connected with the frequency conversion cabinet receiving device through the data transmission module. And the frequency conversion cabinet receiving device is connected with the electric pump well driving motor. According to the utility model, the high precision of liquid level height measurement is realized, the operation process is simplified, and the adaptive capacity is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to coal bed gas exploitation technical field, concretely relates to an electric pump well intelligent controller. BACKGROUND

[0002] In the exploitation process of coal bed gas, the dynamic liquid level height is an important parameter affecting the working efficiency and production stability of electric pump wells. The dynamic liquid level is the interface between liquid (mainly water) and gas in the well, and its position changes with the change of production conditions. For electric pump wells, accurate monitoring of the height of the dynamic liquid level helps to optimize the working mode of the pump, improve energy utilization efficiency and ensure long-term stable operation of the system.

[0003] Traditional dynamic liquid level detection methods, such as acoustic reflection method, capacitance method and pressure difference method, have the following limitations when applied to electric pump wells:

[0004] Insufficient accuracy: due to the influence of environmental factors such as temperature fluctuations, changes in fluid properties, etc., traditional methods may not provide sufficient measurement accuracy, which may result in electric pumps not working in optimal conditions.

[0005] High operation complexity: some traditional methods require complex equipment installation and debugging, which puts high requirements on the technical level of operators, and improper operation can easily lead to data distortion or system failure.

[0006] Slow response speed: as coal bed gas production advances, downhole conditions continue to evolve, and traditional detection methods are difficult to quickly adapt to these changes, limiting the ability to adjust electric pump operation based on the latest conditions.

[0007] Based on this, the utility model provides an electric pump well intelligent controller. CONTENT OF THE UTILITY MODEL

[0008] In order to solve the above problems in the prior art, i.e. the low precision, complex operation and other problems of traditional dynamic liquid level detection methods, and the problem that they cannot effectively adapt to the changes of the dynamic liquid level of coal bed gas production, the utility model provides an electric pump well intelligent controller, which includes an edge controller and a frequency conversion cabinet receiving device, and a casing pressure sensor, a downhole pressure sensor and a liquid level instrument connected with the edge controller;

[0009] The casing pressure sensor is installed at the casing of the oil well for obtaining casing pressure data; the downhole pressure sensor is installed downhole for obtaining downhole pressure data; the liquid level instrument is installed at the casing of the oil well for obtaining liquid level height data;

[0010] The edge controller is arranged at the well mouth, obtains casing pressure data, downhole pressure data and liquid level data, calculates a frequency adjustment signal, and is connected to the frequency conversion cabinet receiving device through a data transmission module, transmits the frequency adjustment signal to the frequency conversion cabinet receiving device through the data transmission module, and adjusts the frequency of the frequency converter.

[0011] The frequency conversion cabinet receiving device is connected to the electric pump well driving motor to control the working frequency of the electric pump well driving motor.

[0012] Further, the edge controller is connected to the frequency conversion cabinet receiving device through a data transmission module, and the specific transmission structure is as follows:

[0013] The edge controller is connected to the data transmission module, a communication port E2 is arranged on the data transmission module, the port E2 is connected to a port E1 through a wireless transmission module, and the port E1 is arranged on the frequency conversion cabinet receiving device.

[0014] Further, the data transmission module is a DTU module.

[0015] Further, the data transmission module is connected to a server, and the server is connected to a user end.

[0016] Further, the server is also connected to a liquid level optimization calculation module, the liquid level optimization calculation module obtains a data acquisition signal through an interface E1 and an interface E2; the data acquisition signal includes real-time temperature data, real-time working frequency, real-time current data and voltage data of the frequency converter;

[0017] The real-time temperature data is obtained based on a temperature sensor, and the temperature sensor is installed in the frequency conversion cabinet receiving device;

[0018] The current data and voltage data are obtained based on a current and voltage acquisition module, and the current and voltage acquisition module is connected to the frequency conversion cabinet receiving device.

[0019] Further, the current and voltage acquisition module is connected to the frequency conversion cabinet receiving device through an open mutual inductor;

[0020] The real-time working frequency is obtained based on a frequency acquisition module, and the frequency acquisition module is connected to the frequency conversion cabinet receiving device.

[0021] Further, an RS-485 interface is arranged on the liquid level meter and the edge controller, and the liquid level meter and the edge controller are connected through the RS-485 interface.

[0022] Further, the downhole pressure sensor is connected to one end of a power carrier based cable, and the other end of the cable is connected to the edge controller.

[0023] The utility model discloses the beneficial effect:

[0024] Improve the measurement precision: through the introduction bushing pressure sensor, downhole pressure sensor and liquid level instrument and so on multi -parameter sensor, the data processing is carried out in combination with edge controller, can more accurately monitor the height change of dynamic liquid level, is not influenced by environmental factors such as temperature change, thereby improved the accuracy of measurement.

[0025] Simplify the operation process: the system automation degree is high, reduces the demand of manual intervention, reduces the technical requirement to operating personnel also avoids the data error due to human factor, makes the whole monitoring process more simple and easy.

[0026] Enhance adaptability: edge controller can obtain the latest production condition information in real time, and accordingly adjusts the working frequency of electric pump well drive motor, ensures that the pumping unit is always in the optimal working state, responds to the change of downhole condition quickly, improves the flexibility and adaptability of system.

[0027] Optimize energy use: through the fine adjustment of frequency cabinet receiving device to motor frequency, can reduce energy consumption as far as possible under the premise of guaranteeing production efficiency, realizes the goal of energy saving and emission reduction.

[0028] Remote monitoring and maintenance: the application of data transmission module (such as DTU) and the connection with server, user end allow technical personnel to monitor equipment operating condition in remote, discover and solve problems in time, reduce field maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0029] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the accompanying drawings:

[0030] Figure 1 It is a kind of module connection relation schematic diagram in the electric pump well intelligent controller of the utility model. DETAILED DESCRIPTION

[0031] The present application will be further described in detail below with reference to the accompanying drawings and examples.It can be understood that the specific examples described herein are only used to explain the related utility model, and not limited to the utility model.In addition, it needs to be explained that, for the convenience of description, only the part related to the utility model is shown in the drawings.

[0032] It needs to be explained that, in the case of no conflict, the examples in the present application and the features in the examples can be combined with each other.The present application will be described in detail below with reference to the accompanying drawings and examples.

[0033] As Figure 1As shown, the utility model provides a kind of electric pump well intelligent controller, including edge controller 1 and frequency conversion cabinet receiving device 2, and with the edge controller 1 connection's casing pressure sensor 3, downhole pressure sensor 4 and liquid level instrument 5;

[0034] The casing pressure sensor 3 is installed at the casing of the oil well, for obtaining casing pressure data;The downhole pressure sensor 4 is installed downhole, for obtaining downhole pressure data;The liquid level instrument 5 is installed at the casing of the oil well, for obtaining liquid level data;

[0035] The edge controller 1 is arranged at the wellhead, and the frequency adjustment signal is calculated by obtaining the casing pressure data, the downhole pressure data and the liquid level data;The edge controller 1 is connected with the frequency conversion cabinet receiving device 2 through the data transmission module 6, and the frequency adjustment signal is transmitted to the frequency conversion cabinet receiving device 2 through the data transmission module 6, and the frequency of the frequency converter is adjusted;

[0036] The frequency conversion cabinet receiving device 2 is connected with the electric pump well driving motor, for controlling the working frequency of the electric pump well driving motor.

[0037] In the implementation process of the utility model, the following steps are included:

[0038] The casing pressure sensor 3, the downhole pressure sensor 4 and the liquid level instrument 5 continuously collect field data.

[0039] After the edge controller 1 receives the above data, the current working condition is analyzed using the built-in algorithm, including but not limited to the key parameters such as dynamic liquid level, pressure difference inside and outside the well.

[0040] According to the analysis result, the edge controller 1 decides whether to adjust the running state of the electric pump, such as changing the motor speed to optimize the production efficiency or maintain the system stability.

[0041] If necessary, the edge controller 1 generates a corresponding frequency adjustment signal and sends it to the frequency conversion cabinet receiving device 2 through the data transmission module 6.

[0042] After receiving the instruction, the frequency conversion cabinet receiving device 2 adjusts the frequency converter output accordingly, and then affects the speed of the electric pump driving motor, to achieve the control purpose.

[0043] The utility model adopts advanced sensor technology and data analysis algorithm, which ensures the accurate measurement of dynamic liquid level and other important parameters. The design of the whole system considers the dynamic changes in the process of coalbed methane exploitation, which can quickly adapt to the changes of downhole conditions and ensure timely adjustment. Compared with the traditional method, the system has higher integration, reduces the need for external intervention and reduces the requirement for the technical level of operators.

[0044] The downhole pressure sensor 4 is connected to one end of the power carrier cable, and the other end of the cable is connected to the edge controller 1.

[0045] The downhole pressure sensor 4 in this embodiment is selected to be able to withstand the high temperature and high pressure environment downhole, and to ensure that it has a power carrier communication interface.

[0046] The power carrier cable in this embodiment is selected to be suitable for downhole conditions. This cable not only provides power transmission, but also supports power carrier communication. The cable needs to have good anti-interference ability and mechanical strength to cope with the complex working conditions downhole.

[0047] The edge controller 1 is equipped with a power carrier communication module, which can analyze data from the downhole sensor and send control instructions.

[0048] The communication protocol is configured as a power carrier modem (PLC Modem). A power carrier modem is installed at each end of the downhole pressure sensor and the edge controller, which is used to convert digital signals into analog signals that can be transmitted on power lines, and vice versa.

[0049] The data transmission process is as follows:

[0050] Initialization: When the system starts, the edge controller 1 sends an initialization command to the downhole pressure sensor 4 to establish a communication link.

[0051] Periodic collection: The downhole pressure sensor automatically collects pressure data at a preset time interval and uploads it to the edge controller through the power carrier cable.

[0052] Real-time monitoring and adjustment: After receiving the data, the edge controller analyzes and processes it, generates the corresponding control strategy according to the analysis result, and sends it to the downhole equipment through the same cable, such as adjusting the sampling frequency or executing a specific diagnostic program.

[0053] Fault detection and recovery: The built-in self-checking mechanism triggers an alarm and attempts to re-establish a connection as soon as it detects a communication anomaly. If multiple attempts fail, an error log is recorded and reported to the ground control system.

[0054] This embodiment takes into account the particularity of downhole work and adopts a dual-cable or redundant communication path design scheme to ensure that even if one line fails, the other can still maintain basic functionality.

[0055] The liquid level meter 5 and the edge controller 1 are both provided with an RS-485 interface, and the liquid level meter 5 and the edge controller 1 are connected through the RS-485 interface.

[0056] The liquid level meter 5 in this embodiment selects a liquid level measuring device with a standard RS-485 interface, ensuring that it can work stably in the downhole environment and has sufficient precision to meet the application requirements.

[0057] To configure the liquid level meter 5, the edge controller 1 in this embodiment confirms that the edge controller is equipped with a compatible RS-485 interface that can support full-duplex or half-duplex communication mode, depending on the needs of the actual application scenario.

[0058] This embodiment selects shielded twisted pair as the RS-485 communication cable to reduce electromagnetic interference and ensure signal quality. The cable should have good corrosion resistance and mechanical strength, suitable for downhole environment.

[0059] During connection, according to the RS-485 standard, connect the A+ and B- differential signal lines correctly, and ground the shield layer at both ends to improve anti-interference ability.

[0060] In this embodiment, the baud rate of the liquid level meter and the edge controller is set to the same value, such as 9600bps, 19200bps, etc. Common rates to ensure that both can communicate synchronously.

[0061] The data transmission process is as follows:

[0062] Initialization: When the system starts, the edge controller sends an initialization command to the liquid level meter to establish a communication link and calibrate time synchronization.

[0063] Periodic collection: According to the preset time interval, the edge controller polls each liquid level meter to request the latest liquid level data.

[0064] Real-time response: When the liquid level meter detects significant changes, it actively reports to the edge controller to adjust the working state of the electric pump in a timely manner.

[0065] Error handling: If an error occurs during communication, such as timeout without response, a retry mechanism is executed; if it fails continuously for multiple times, logs are recorded and an alarm is sent to the operator.

[0066] In this embodiment, redundant RS-485 buses or backup communication paths are considered to ensure that even if one line fails, the other can still maintain basic functions.

[0067] The edge controller 1 is connected to the data transmission module 6, which is provided with a communication port E2. The port E2 is connected to the port E1 through a wireless transmission module, and the port E1 is provided on the frequency conversion cabinet receiving device 2.

[0068] The wireless communication module can be any one of LORA, ZIGBEE or WIFI, for LORA, a LoRaWAN gateway can be selected, for ZIGBEE, a coordinator node is used, and for WIFI, an industrial-grade wireless router is adopted.

[0069] As a further explanation of the utility model, the data transmission module 6 is a DTU module.

[0070] As a further explanation of the utility model, the data transmission module 6 is connected with a server 7, and the server 7 is connected with a user end 8.

[0071] The server is also connected with a liquid level optimization calculation module 9, the liquid level optimization calculation module 9 obtains data acquisition signals through interfaces E1 and E2; the data acquisition signals include real-time temperature data, real-time working frequency, real-time current data and voltage data of the frequency converter;

[0072] The real-time temperature data is obtained based on a temperature sensor 10, the temperature sensor 10 is installed in the frequency conversion cabinet receiving device 2 and draws out a temperature probe;

[0073] The current data and voltage data are obtained based on a current and voltage acquisition module 11, the current and voltage acquisition module 11 is connected with the frequency conversion cabinet receiving device 2;

[0074] The current data and voltage data of the motor are obtained through an open mutual inductor.

[0075] The real-time working frequency is obtained based on a frequency acquisition module 12, the frequency acquisition module 12 is connected with the frequency conversion cabinet receiving device 2.

[0076] The server can be a cloud server in the embodiment, which receives and stores casing pressure, downhole pressure and dynamic liquid level height data collected by the casing pressure sensor 3, the downhole pressure sensor 4 and the liquid level instrument 5 through the interface E2, after storage, uploads to the liquid level optimization calculation module 9, the liquid level optimization calculation module 9 can also obtain real-time temperature data, real-time working frequency, real-time current data and voltage data of the driving device through the interface E1, analyzes the current working condition based on the above data, considers the influence of seasonal temperature change on the performance of the frequency converter, and intelligently adjusts the oil well driving device (that is, the frequency converter) to automatically be in a safe operating range.

[0077] According to the analysis of the liquid level rising speed and its recovery law based on historical data, a prediction model is established to guide future operation strategy.

[0078] An optimization algorithm is developed to adjust the operating frequency of the electric pump based on the ambient temperature, avoiding overheating or over-power operation of the motor. For example, increase the operating frequency during the night low temperature period, and decrease the frequency during the daytime high temperature period, to balance production and maintenance needs.

[0079] Specifically: Use the temperature sensor 10 installed in the frequency conversion cabinet receiving device 2 to continuously collect real-time temperature data of the frequency converter. Compare the collected temperature data with the preset safe operation range to determine whether the frequency converter is in an overheating state. If the temperature exceeds the safety threshold, an alarm is triggered or automatic cooling measures are taken.

[0080] Through the current and voltage acquisition module 11, the real-time current and voltage data of the motor are regularly obtained, and the power consumption is calculated. When the motor current or power exceeds the rated value, the system will issue a warning and consider reducing the operating frequency to prevent motor damage.

[0081] During the night low temperature period, appropriately increase the operating frequency of the electric pump to increase the pumping rate and thus increase production.

[0082] During the daytime high temperature period, reduce the operating frequency of the electric pump to reduce heat accumulation and protect the motor from overheating damage.

[0083] During the summer high temperature period, reduce the operating frequency of the electric pump in advance, while in the winter cold period, the frequency can be appropriately increased.

[0084] In summary, the liquid level optimization calculation module 9 generates specific control instructions, such as adjusting the operating frequency of the electric pump, based on the above analysis and algorithms. It takes into account multiple factors such as temperature, current, voltage, and liquid level rise speed to ensure the scientificity and rationality of the instructions.

[0085] The optimized control instructions are transmitted back to the data transmission module 6 through the server 7, and then transmitted to the frequency conversion cabinet receiving device 2 by the latter, ultimately affecting the behavior of the electric pump driving motor.

[0086] The system maintains real-time monitoring of all key parameters and evaluates the effectiveness of the optimization strategy to provide a basis for the next round of adjustments.

[0087] Suppose on a typical summer day, the morning temperature is low, and the system can allow the electric pump to operate at a higher frequency to take advantage of the heat dissipation advantage under low temperature conditions. As the temperature gradually rises at noon, the system will automatically reduce the operating frequency of the electric pump to avoid overheating of the motor. At night, the temperature drops again, and the system can increase the operating frequency of the electric pump to continue efficient pumping. Such a strategy not only protects the equipment, but also improves overall production efficiency.

[0088] Through this intelligent control system, not only can effectively monitor and optimize the working state of the electric pump well, but also can adapt to different environmental conditions, ensure the stability and efficiency of the system. This helps to improve the energy utilization efficiency in the process of coalbed methane exploitation, reduce the cost, and ensure the long-term stable operation of the equipment.

[0089] In the description of the present utility model, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is merely for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0090] In addition, it also needs to be explained that, in the description of the present utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present utility model can be understood according to the specific circumstances.

[0091] The term "includes" or any other similar term is intended to cover non-exclusive inclusion, so that the process, method, article or equipment / device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes the elements inherent to the process, method, article or equipment / device.

[0092] So far, the technical scheme of the present utility model has been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present utility model is obviously not limited to these specific embodiments. Without deviating from the principles of the present utility model, those skilled in the art can make equivalent changes or replacements to related technical features, and the technical scheme after the changes or replacements will fall within the protection scope of the present utility model.

Claims

1. An electrically pumped well intelligence controller, characterized by, It comprises an edge controller (1) and a frequency conversion cabinet receiving device (2), and a casing pressure sensor (3), a downhole pressure sensor (4) and a liquid level gauge (5) connected with the edge controller (1); The casing pressure sensor (3) is installed at the casing of the oil well to obtain casing pressure data; the downhole pressure sensor (4) is installed downhole to obtain downhole pressure data; and the liquid level gauge (5) is installed at the casing of the oil well to obtain liquid level data; The edge controller (1) is arranged at the wellhead, and obtains frequency adjustment signals by calculating the casing pressure data, the downhole pressure data and the liquid level data; the edge controller (1) is connected with the frequency conversion cabinet receiving device (2) through a data transmission module (6), and transmits the frequency adjustment signals to the frequency conversion cabinet receiving device (2) through the data transmission module (6) to adjust the frequency of the frequency converter. The frequency conversion cabinet receiving device (2) is connected with the electric pump well driving motor to control the working frequency of the electric pump well driving motor.

2. An intelligent controller for an electrically pumped well according to claim 1, wherein, The edge controller (1) is connected with the frequency conversion cabinet receiving device (2) through the data transmission module (6), and the specific transmission structure is that: The edge controller (1) is connected with the data transmission module (6), and a communication port (E2) is arranged on the data transmission module (6); the communication port (E2) is connected with a port (E1) through a wireless transmission module, and the port (E1) is arranged on the frequency conversion cabinet receiving device (2).

3. An intelligent controller for an electrically pumped well according to claim 2, wherein, The data transmission module (6) is a DTU module.

4. The intelligent controller for an electrically pumped well of claim 2, wherein, The data transmission module (6) is connected with a server (7), and the server (7) is connected with a user end (8).

5. An intelligent controller for an electrically pumped well according to claim 4, wherein, The server is also connected with a liquid level optimization calculation module (9), and the liquid level optimization calculation module (9) obtains data acquisition signals through the port (E1) and the communication port (E2); the data acquisition signals comprise real-time temperature data, real-time working frequency, real-time current data and voltage data of the frequency converter; The real-time temperature data is obtained based on a temperature sensor (10) installed in the frequency conversion cabinet receiving device (2); The current data and the voltage data are obtained based on a current and voltage acquisition module (11) connected with the frequency conversion cabinet receiving device (2); The real-time working frequency is obtained based on a frequency acquisition module (12) connected with the frequency conversion cabinet receiving device (2).

6. An intelligent controller for an electrically pumped well according to claim 5, wherein, The current and voltage acquisition module (11) is connected with the frequency conversion cabinet receiving device (2) through an open mutual inductor.

7. The intelligent control system for an electrically pumped well of claim 1, wherein, RS-485 interfaces are arranged on the liquid level gauge (5) and the edge controller (1), and the liquid level gauge (5) and the edge controller (1) are connected through the RS-485 interfaces.

8. The intelligent control system for an electrically pumped well of claim 1, wherein, The downhole pressure sensor (4) is connected with one end of a power carrier based cable, and the other end of the cable is connected with the edge controller (1).

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