Frequency reduction system for electric submersible pump of oil well

Abstract

The utility model relates to a frequency reduction system for an electric submersible pump of an oil well, which is characterized in that an upper computer PLC (Programmable Logic Controller) is in one-to-one communication or loop communication with each frequency converter of the electric submersible pump, and state information of each frequency converter of the electric submersible pump is read and remote control is carried out by editing a communication program of the upper computer PLC; the upper computer PLC and each PLC in the central control PCS module respectively perform communication programming to ensure that each instruction and data transmission are correct, and each parameter in each electric submersible pump frequency converter read by the upper computer PLC is transmitted to the central control PCS module and is displayed on a central control picture; the central control PCS module is connected with the frequency converter of the electric submersible pump, and controls the normal shutdown of the frequency converter of the electric submersible pump by connecting or disconnecting a loop; the center control ESD module is connected with the electric submersible pump frequency converter, and ESD emergency shutdown of the electric submersible pump frequency converter is controlled by connecting or disconnecting a loop. Production shutdown and frequent starting and stopping of the electric submersible pump can be avoided, and the service life of the electric submersible pump is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of oil well electric submersible pump control technology, and in particular to an oil well electric submersible pump frequency reduction system. Background Technology

[0002] Offshore platform crude oil extraction utilizes an electric drive system. The operating frequency is controlled by a frequency converter, and the voltage is boosted by a transformer before being connected to an electric submersible pump via a bottom-hole cable. This pump lifts the crude oil from the well to the offshore platform for processing before export. To reduce pipeline pressure, downstream processing pressure, and increase production, a dehydration system is installed on the wellhead platform to dehydrate the extracted crude oil. Once the dehydration is deemed satisfactory, the produced water is discharged into the sea. If there are problems with the dehydration system or equipment in the process, or if the produced water discharged into the sea does not meet standards, immediate emergency measures are required. This involves stopping the discharge, shutting down the dehydration system, and restoring the system only after the fault has been resolved. During this process, the well's fluid production must be significantly reduced; otherwise, high pressure or fluid levels will quickly lead to production shutdown.

[0003] In the event of a production emergency, there are generally several scenarios:

[0004] First, the production water discharged from the dehydration system is substandard and cannot be resolved in a short time, necessitating an emergency shutdown of the dehydration system. The amount of production water discharged from the dehydration system accounts for approximately three-quarters of the total fluid production of the oil well. Shutting down the dehydration system requires an immediate reduction in fluid production, with some wells shut down and others reduced in frequency. However, many electric submersible pump wells currently only have local control methods, making it difficult for operators to quickly complete these tasks within a limited timeframe.

[0005] Secondly, the external pump operates in a two-in-one-backup mode. If one of the operating external pumps fails, the liquid level in the closed drain tank may rise rapidly due to insufficient external liquid output, requiring immediate switching to the backup pump. If the backup pump cannot start quickly, the liquid inflow must be reduced, which can only be done by stopping individual wells or reducing the frequency. If not handled in time, production will soon be shut down due to the high liquid level in the closed drain tank, and all well electric submersible pumps will be shut down.

[0006] Third, in the event of production abnormalities, such as oil and gas leaks, the electric submersible pump needs to be shut down urgently. Currently, the only way to do this is to trigger an ESD3 or ESD2 level shutdown.

[0007] In actual production, ESP wells are classified and managed based on several factors: some wells have low ESP insulation, so frequent start-ups and shutdowns should be avoided to extend their service life; some wells have high oil production, so uninterrupted well operation is not necessary to ensure stable and increased production; and some wells may be treated differently due to potential hazards. Therefore, a reasonable emergency solution is urgently needed. Utility Model Content

[0008] The purpose of this utility model is to solve at least one technical problem in the background art and to provide a frequency reduction system for an oil well electric submersible pump.

[0009] To achieve the above objectives, this utility model provides a frequency reduction system for an electric submersible pump (ESP) in an oil well, comprising: multiple ESP frequency converters, a host computer PLC, a central control PCS module, and a central control ESD module;

[0010] The host PLC communicates one-to-one or loop communication with each of the electric submersible pump frequency converters. By editing the host PLC communication program, it can read the status information of each electric submersible pump frequency converter and perform remote control.

[0011] The host PLC communicates and programs with each PLC in the central control PCS module to ensure that all instructions and data are transmitted correctly. The host PLC reads the parameters from each electric submersible pump frequency converter and transmits them to the central control PCS module, where they are displayed on the central control screen.

[0012] The central control PCS module is connected to the electric submersible pump frequency converter and controls the normal shutdown of the electric submersible pump frequency converter by connecting or disconnecting the circuit.

[0013] The central control ESD module is connected to the electric submersible pump frequency converter and controls the ESD emergency shutdown of the electric submersible pump frequency converter by connecting or disconnecting the circuit.

[0014] According to one aspect of this utility model, the host computer PLC communicates one-to-one with each of the electric submersible pump frequency converters through an RS485 communication card, or multiple electric submersible pump frequency converters are connected in series to form an RS485 communication link and communicate in a loop with one RS485 communication card of the host computer PLC.

[0015] According to one aspect of this utility model, the host computer PLC and the central control PCS module communicate via RS485 or Ethernet.

[0016] According to one aspect of this utility model, the central control PCS module is connected to the electric submersible pump frequency converter via a 2-core communication line. The communication line is connected to the IO port of the electric submersible pump frequency converter during normal shutdown, and the normal shutdown of the electric submersible pump frequency converter is controlled by connecting or disconnecting the circuit.

[0017] According to one aspect of this utility model, the central control ESD module is connected to the electric submersible pump frequency converter via a 2-core communication line; the 2-core communication line is connected to the ESD emergency shutdown IO port of the frequency converter, and the ESD emergency shutdown of the electric submersible pump frequency converter is controlled by connecting or disconnecting the circuit.

[0018] According to one aspect of this utility model, it further includes: a touch screen, which communicates with a host PLC, and sends control commands to the host PLC through the touch screen. The control commands are output by the host PLC to the electric submersible pump frequency converter, and the electric submersible pump frequency converter performs corresponding actions.

[0019] According to one aspect of this utility model, it further includes: a server, which communicates with the central control PCS module, and sends control commands to the central control PCS module through the server. The control commands are sent by the central control PCS module to the host computer PLC, and the host computer PLC outputs control commands to the electric submersible pump frequency converter, which then performs corresponding actions.

[0020] According to the solution of this utility model, it can conveniently read the parameters of the electric submersible pump frequency converter and take corresponding one-key PSD, one-key ESD, one-key frequency reduction, one-key delayed frequency reduction and other rapid emergency response modes as needed. It has comprehensive functions and strong adaptability, and successfully solves the problems of inconvenient and untimely operation of electric submersible pump frequency converters, which cannot meet the needs of emergency situations requiring rapid response. It ensures the stability of production, reduces unnecessary downtime, and improves the service life of electric submersible pumps.

[0021] This invention can effectively solve production emergencies such as the need for emergency shutdown due to dehydration system failure leading to significant fluctuations in the production process, and the rapid rise in liquid level in closed-loop tanks due to insufficient liquid delivery caused by external pump failure. It ensures stable production, avoids production shutdowns and frequent start-ups and shutdowns of the electric submersible pump, and extends the service life of the electric submersible pump. Attached Figure Description

[0022] Figure 1 The schematic diagram shows the structural layout of an oil well electric submersible pump frequency reduction system according to one embodiment of the present invention.

[0023] Figure 2 This diagram schematically illustrates the screen layout of a central control computer screen according to one embodiment of the present invention. Detailed Implementation

[0024] The present invention will now be discussed with reference to exemplary embodiments. It should be understood that the described embodiments are merely intended to enable those skilled in the art to better understand and thus implement the present invention, and are not intended to imply any limitation on the scope of the present invention.

[0025] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment".

[0026] Figure 1 This diagram schematically illustrates the structural layout of an oil well electric submersible pump frequency reduction system according to one embodiment of the present invention. Figure 1 As shown, in this embodiment, the oil well electric submersible pump frequency reduction system includes: multiple electric submersible pump frequency converters 1, a host computer PLC 2, a central control PCS module 3, and a central control ESD module 4;

[0027] The host computer PLC2 communicates one-to-one or via loop with each electric submersible pump frequency converter 1. By editing the host computer PLC communication program, the status information of each electric submersible pump frequency converter 1 can be read and remote control can be performed.

[0028] The host computer PLC2 communicates and programs with each PLC in the central control PCS module 3 to ensure that all instructions and data are transmitted correctly. The host computer PLC2 reads the parameters from each electric submersible pump frequency converter 1 and transmits them to the central control PCS module 3, and displays them on the central control screen.

[0029] The central control PCS module 3 is connected to the electric submersible pump frequency converter 1, and controls the normal shutdown of the electric submersible pump frequency converter 1 by connecting or disconnecting the circuit;

[0030] The central control ESD module 4 is connected to the electric submersible pump inverter 1, and controls the ESD emergency shutdown of the electric submersible pump inverter 1 by connecting or disconnecting the circuit.

[0031] Furthermore, such as Figure 1 As shown, according to one embodiment of this utility model, the host computer PLC2 communicates one-to-one with each electric submersible pump frequency converter 1 via an RS485 communication card 5, or multiple electric submersible pump frequency converters 1 are connected in series to form an RS485 communication link and communicate in a loop with one RS485 communication card of the host computer PLC2. The host computer PLC communicates with the frequency converters via RS485. By editing the host computer PLC communication program, the frequency converter status information can be read and remote control can be performed.

[0032] Furthermore, according to one embodiment of this utility model, the host computer PLC2 and the central control PCS module 3 communicate via RS485 or Ethernet. In this embodiment, communication programming is performed separately in the host computer PLC and the PLC of the central control PCS module to ensure the correctness of all instructions and data transmission. All parameters of the electric submersible pump inverter 1 read by the host computer PLC can be transmitted to the central control PCS module for display on its central control screen.

[0033] Furthermore, according to one embodiment of the present invention, the central control PCS module 3 is connected to the electric submersible pump inverter 1 via a 2-core communication line 6. The 2-core communication line is connected to the IO port of the electric submersible pump inverter 1 during normal shutdown, and the normal shutdown of the electric submersible pump inverter 1 is controlled by connecting or disconnecting the circuit.

[0034] Furthermore, according to one embodiment of the present invention, the central control ESD module 4 is connected to the electric submersible pump inverter 1 via a 2-core communication line 7; the 2-core communication line 7 is connected to the IO port of the electric submersible pump inverter for ESD emergency shutdown, and the ESD emergency shutdown of the electric submersible pump inverter 1 is controlled by connecting or disconnecting the circuit.

[0035] Furthermore, such as Figure 1 As shown, according to one embodiment of the present invention, the oil well electric submersible pump frequency reduction system further includes: a touch screen 8, which communicates with a host computer PLC2, and sends control commands to the host computer PLC2 through the touch screen 8. The control commands are output by the host computer PLC2 to the electric submersible pump frequency converter 1, and the electric submersible pump frequency converter 1 performs corresponding actions.

[0036] Furthermore, such as Figure 1 As shown, according to one embodiment of this utility model, the oil well electric submersible pump frequency reduction system further includes: a server 9, which communicates with the central control PCS module. The operator sends control commands to the central control PCS module 3 through the central control computer screen of the server. The control commands are sent by the central control PCS module 3 to the host computer PLC2. The host computer PLC2 outputs control commands to the electric submersible pump frequency converter 1, and the electric submersible pump frequency converter 1 performs corresponding actions.

[0037] Furthermore, Figure 2 This is a schematic diagram illustrating the screen layout of a central control computer according to one embodiment of the present invention. Figure 2 As shown in this embodiment, a selection screen is provided on the central control computer screen. Through configuration screen software, the required electric submersible pump control mode can be selected according to the actual situation. The control modes include one-key PSD, one-key ESD, one-key frequency reduction, and one-key delayed frequency reduction mode. By clicking the corresponding button on the screen, the corresponding control requirements can be output.

[0038] In this embodiment, the one-click PSD mode implementation method displays eight wells on the central control screen. The specific number of wells can be set according to actual conditions. Each well has a PSD checkbox, which must be pre-selected. The central control PCS system is programmed so that clicking the one-click PSD button triggers a shutdown command, disconnecting the corresponding output relay and shutting down the selected well's ESD pump (electric submersible pump), i.e., normal production shutdown. The frequency converter first reduces its frequency before shutting down. Clicking the one-click PSD button retains the command until the reset button is clicked to cancel the command.

[0039] In this embodiment, the one-click ESD mode implementation method displays eight wells on the central control screen. The specific number of wells can be set according to actual conditions. Each well has an ESD checkbox that needs to be pre-selected. The central control ESD system is programmed so that clicking the one-click ESD button triggers a shutdown command, disconnecting the corresponding output relay and ESD-induced shutdown of the selected well's ESD submersible pump (EMP), i.e., emergency shutdown. The frequency converter also immediately stops. Clicking the one-click ESD button retains the command until the reset button is clicked to cancel the command.

[0040] In this embodiment, the one-click frequency reduction mode is implemented by displaying eight wells on the central control screen. The specific number of wells can be set according to actual conditions. Each well has five checkboxes corresponding to 50Hz, 45Hz, 40Hz, 35Hz, and 30Hz, respectively. These must be pre-selected, and only one can be selected at a time. The central control PCS system is programmed so that clicking the one-click frequency reduction button triggers a frequency reduction command, which is transmitted to the host PLC. The PLC then controls the inverter to operate according to the pre-selected frequency. Clicking the one-click frequency reduction button retains the command until the reset button is clicked to cancel the command.

[0041] In this embodiment, the one-click delay frequency reduction mode implementation method has 8 wells on the central control screen. The specific number of wells can be set according to the actual situation. The delay time can be set for each well. The system is programmed in the central control PCS system. When the one-click frequency reduction button is clicked, the timer is first started according to the set delay time. The frequency reduction command is triggered after the timer is completed.

[0042] In this implementation, for example, wells that need to be shut down via PSD are pre-selected on the central control computer screen, such as wells 1, 3, 5, and 7. When a production emergency occurs and the one-click PSD button is clicked, wells 1, 3, 5, and 7 will automatically reduce their frequency and shut down under the control of the frequency converter, while wells 2, 4, 6, and 8 will not be affected and will continue normal production. After clicking the reset button, the PSD shutdown command is canceled, and wells 1, 3, 5, and 7 can be manually restarted normally.

[0043] On the central control computer screen, pre-select the wells that need to be shut down via ESD, such as wells 1, 2, 3, and 4. When a production emergency occurs and the one-click ESD button is clicked, wells 1, 2, 3, and 4 will immediately stop under the control of the frequency converter, while wells 5, 6, 7, and 8 will not be affected and will continue normal production. After clicking the reset button, the ESD shutdown command is canceled, and wells 1, 2, 3, and 4 can be manually restarted normally.

[0044] On the central control computer screen, pre-select the wells that require one-click frequency reduction. Based on the production and oil yield of each well, choose the required frequency for frequency reduction and set an appropriate delay time to stagger the frequency reduction times and ensure more stable production. For example, select 50Hz for well 1, 45Hz for well 2, 40Hz for well 3, and 35Hz for wells 5, 6, 7, and 8. Set the delay time to 0 seconds for wells 1 to 4 and 10 seconds for wells 5 to 8. When an emergency occurs and the one-click frequency reduction button is clicked, wells 1 to 4 immediately begin reducing their frequencies to 50Hz, 45Hz, 40Hz, and 35Hz respectively. After 10 seconds, wells 5 to 8 begin reducing their frequencies to 30Hz. Once the frequency reduction command is given, the operating frequency is locked and cannot be modified again. Clicking the reset button cancels the one-click frequency reduction command, and all eight wells maintain the reduced frequency. The operating frequency can then be manually adjusted again.

[0045] According to the above-mentioned solution of this utility model, this utility model can conveniently read the parameters of the electric submersible pump frequency converter and take corresponding one-key PSD, one-key ESD, one-key frequency reduction, one-key delayed frequency reduction and other rapid emergency response modes as needed according to actual conditions. It has comprehensive functions and strong adaptability, and successfully solves the problems of inconvenient and untimely operation of electric submersible pump frequency converters, which cannot meet the needs of emergency situations requiring rapid response. It ensures the stability of production, reduces unnecessary downtime, and improves the service life of electric submersible pumps.

[0046] This invention can effectively solve production emergencies such as the need for emergency shutdown due to dehydration system failure leading to significant fluctuations in the production process, and the rapid rise in liquid level in closed-loop tanks due to insufficient liquid delivery caused by external pump failure. It ensures stable production, avoids production shutdowns and frequent start-ups and shutdowns of the electric submersible pump, and extends the service life of the electric submersible pump.

[0047] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A frequency reduction system for an electric submersible pump in an oil well, characterized in that, include: Multiple electric submersible pump frequency converters, host computer PLC, central control PCS module and central control ESD module; The host PLC communicates one-to-one or loop communication with each of the electric submersible pump frequency converters. By editing the host PLC communication program, it can read the status information of each electric submersible pump frequency converter and perform remote control. The host PLC communicates and programs with each PLC in the central control PCS module to ensure that all instructions and data are transmitted correctly. The host PLC reads the parameters from each electric submersible pump frequency converter and transmits them to the central control PCS module, where they are displayed on the central control screen. The central control PCS module is connected to the electric submersible pump frequency converter and controls the normal shutdown of the electric submersible pump frequency converter by connecting or disconnecting the circuit. The central control ESD module is connected to the electric submersible pump frequency converter and controls the ESD emergency shutdown of the electric submersible pump frequency converter by connecting or disconnecting the circuit.

2. The frequency reduction system for an electric submersible pump in an oil well according to claim 1, characterized in that, The host PLC communicates one-to-one with each of the electric submersible pump frequency converters via an RS485 communication card, or multiple electric submersible pump frequency converters are connected in series to form an RS485 communication link and communicate in a loop with one RS485 communication card of the host PLC.

3. The frequency reduction system for an electric submersible pump in an oil well according to claim 1, characterized in that, The host PLC and the central control PCS module communicate via RS485 or Ethernet.

4. The frequency reduction system for an electric submersible pump in an oil well according to claim 1, characterized in that, The central control PCS module is connected to the electric submersible pump frequency converter via a 2-core communication line. The 2-core communication line is connected to the IO port of the electric submersible pump frequency converter for normal shutdown. The normal shutdown of the electric submersible pump frequency converter is controlled by connecting or disconnecting the circuit.

5. The frequency reduction system for an electric submersible pump in an oil well according to claim 1, characterized in that, The central control ESD module is connected to the electric submersible pump frequency converter via a 2-core communication cable. The 2-core communication cable is connected to the ESD emergency shutdown IO port of the frequency converter, and the ESD emergency shutdown of the electric submersible pump frequency converter is controlled by connecting or disconnecting the circuit.

6. The frequency reduction system for an electric submersible pump in an oil well according to claim 1, characterized in that, Also includes: The touch screen communicates with the host PLC and sends control commands to the host PLC. The host PLC then outputs the control commands to the electric submersible pump frequency converter, which executes the corresponding actions.

7. The frequency reduction system for an electric submersible pump in an oil well according to any one of claims 1-6, characterized in that, Also includes: The server communicates with the central control PCS module and sends control commands to the central control PCS module. The central control PCS module then sends the control commands to the host PLC, which outputs the control commands to the electric submersible pump frequency converter, which then performs the corresponding actions.

Images