Ground monitoring system for electric submersible pump well

Abstract

The invention discloses a ground monitoring system for an electric submersible pump well. The ground monitoring system comprises a shell, a metal processing box body and a box body lining insulating bakelite plate, the mutual inductor is used for collecting current and voltage signals; the controllable phase shifter is used for receiving the alternating-current electric signal transmitted by the mutual inductor, adjusting the phase of the alternating-current electric signal and outputting the adjusted electric signal to the data acquisition controller, is provided with a 485 communication interface and can be used for receiving setting data of the data acquisition controller; the method has the beneficial effects that a monitoring mode depending on an underground sensor is changed, the problem that an underground instrument cannot be repaired and checked due to faults is solved, and the maintenance difficulty and cost are reduced; while digital monitoring is realized, a mass basis of a traditional current card diagnosis technology is inherited, which is convenient for employees to understand and apply; the controllable phase shifter is used for adjusting the phase of a signal acquired by the mutual inductor, so that the problem of phase deviation caused by the high-voltage mutual inductor is solved, and the accuracy of a power factor and subsequent calculation and analysis is improved.

Description

Technical Field

[0001] The present invention belongs to the technical fields of Internet of Things technology, big data artificial intelligence technology, oil digitization, and electric energy monitoring technology, and specifically relates to a surface monitoring system for submersible electric pump wells. Background Art

[0002] In the field of oil extraction, the monitoring of submersible electric pump wells is crucial; currently, most submersible electric pump wells use Internet of Things technology combined with downhole sensors to achieve monitoring. This downhole monitoring method has obvious drawbacks. For example, once the instrument fails, it faces problems such as being unable to be repaired and calibrated; at the same time, compared with the traditional current card diagnosis technology for electric pump wells, the ability of practitioners to analyze downhole instrument data is relatively lacking, while the current card technology has a broader mass base through decades of experience accumulation.

[0003] Although the current card technology has a development history of several decades, for a long time, the current card has been realized by a mechanical structure and it is difficult to achieve digitization using Internet of Things technology; even if the current card is digitized, due to the influence of modern drive technology, the current will show serious distortion.

[0004] It can be seen that the development of the surface monitoring technology for submersible electric pump wells not only requires inheriting the characteristics of traditional current cards, but also needs to more comprehensively monitor other data of submersible electric pump wells; in addition, modern submersible electric pump wells generally use variable frequency control, and mostly use high-voltage inverters of about 3KV. The length of the variable frequency output cable is usually between 1000 and 3000 meters; the longer cable will cause an increase in the harmonic content, resulting in serious distortion of current detection.

[0005] In the surface monitoring of submersible electric pump wells, the monitoring of electrical parameter data is indispensable; high-voltage transformers are a reliable and low-cost solution, but due to the use of relatively large current transformers and voltage transformers, a certain deviation will occur in the phase of the current and voltage. This phase deviation will lead to inaccurate power factors, thereby affecting later calculations and analyses. Summary of the Invention

[0006] The purpose of the present invention is to provide a surface monitoring system for submersible electric pump wells, solve the pain points of traditional monitoring technologies, improve the monitoring accuracy of electrical parameter data, and achieve comprehensive digitization and convenient operation and maintenance.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A surface monitoring system for submersible electric pump wells, comprising A housing, a box body made of metal processing, and the box body is lined with insulating electrical plywood; A transformer for collecting current and voltage signals; A controllable phase shifter that receives the alternating current signal transmitted by the mutual inductor, adjusts its phase, and outputs the adjusted electrical signal to the data acquisition controller. It has a 485 communication interface and can receive the setting data of the data acquisition controller. The data acquisition controller converts the electrical signal into a digital signal, filters and calculates it to form electrical parameter data including voltage, current, and active power, generates polar coordinate system data corresponding to current and time, and uploads the data through the 485 interface to connect with the industrial gateway. It can remotely control the frequency converter of the submersible electric pump well through analog output and remote control terminals, and its signal acquisition input terminal can connect to on-site instrument signals. The industrial gateway is upward compatible with 4G / 5G communication, network communication, and 485 communication, and is downward connected to the data acquisition controller through 485 communication.

[0008] As a preferred technical solution of the present invention, the system is installed on the line between the control cabinet of the submersible electric pump well and the downhole electric pump.

[0009] As a preferred technical solution of the present invention, the data acquisition controller has a 485 communication interface connected to the controllable phase shifter to set the phase shift angle.

[0010] As a preferred technical solution of the present invention, the method for receiving the alternating current signal transmitted by the mutual inductor and adjusting its phase is as follows: The current transformer and voltage transformer collect the alternating current signal in the submersible electric pump well line and transmit it through the line to the input port of the controllable phase shifter. The controllable phase shifter internally integrates a phase detection circuit to perform real-time sampling on the input current and voltage signals and analyze the phase difference between the two. According to the phase shift setting instruction sent by the data acquisition controller through the 485 communication interface and combined with the real-time detected phase deviation, the microprocessor inside the controllable phase shifter calculates the angle that needs to be adjusted. The controllable phase shifter uses a control chip based on a digital signal processor or a field programmable gate array, combined with an analog phase shift circuit. When an alternating current signal is input, the control chip generates a control signal according to the calculated phase shift angle and drives the analog circuit to adjust the phase of the signal in real time. It interacts with the data acquisition controller through the 485 communication interface to dynamically calibrate the phase shift angle.

[0011] As a preferred technical solution of the present invention, the alternating current signal includes the amplitude and phase information of current and voltage.

[0012] As a preferred technical solution of the present invention, the phase shift circuit includes an RC phase shift network and a digital phase shift integrated circuit.

[0013] As a preferred technical solution of the present invention, the data acquisition controller converts the electrical signal into a digital signal, which is filtered and calculated to form electrical parameter data including voltage, current, and active power, and generates polar coordinate system data corresponding to current and time. The implementation method is as follows: The electrical signal output by the thyristor-controlled phase shifter first passes through the signal conditioning circuit of the data acquisition controller to remove high-frequency noise and interference, ensuring that the signal amplitude matches the input range of the analog-to-digital converter; The conditioned analog electrical signal is converted into a digital signal through a high-precision analog-to-digital converter; The digital signal is filtered using an FIR or IIR filter to eliminate harmonic and interference components; The sampled values of the filtered digital signal are statistically analyzed, and the effective values of voltage and current are calculated through the root-mean-square algorithm; According to the instantaneous power formula P(t)=u(t)×i(t), the sampled values of instantaneous power within a cycle are integrated and averaged to obtain the active power, where u(t) is the instantaneous voltage value and i(t) is the instantaneous current value; A polar coordinate system is established with time as the polar axis and the effective value of current as the polar radius; The current-time series in the time domain is converted into the polar coordinate format (r,θ), where r is the effective value of current and θ is the angle at the corresponding time point, forming a polar coordinate data series.

[0014] As a preferred technical solution of the present invention, it also includes a cloud that stores the parameters when high-voltage electricity passes through for system detection.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: It changes the monitoring method that relies on downhole sensors, solves the problems that downhole instruments cannot be repaired and calibrated due to failures, and reduces the maintenance difficulty and cost; While realizing digital monitoring, it inherits the mass base of traditional current card diagnosis technology, which is convenient for practitioners to understand and apply; By adjusting the phase of the signal collected by the mutual inductor through the thyristor-controlled phase shifter, the phase deviation problem caused by high-voltage mutual inductors is solved, and the power factor and the accuracy of subsequent calculation and analysis are improved; Aiming at the harmonic interference problem caused by long cables under variable frequency control, through the filtering, calculation and other processing of the data acquisition controller, the distortion of current detection is improved; It can collect data such as voltage, current, and active power, and generate polar coordinate system data corresponding to current and time, providing comprehensive data support for the analysis of the operating state of oil wells; The industrial gateway supports multiple communication methods such as 4G / 5G, network, and 485, ensuring the stability and flexibility of data upload; The data acquisition controller can remotely control the submersible motor pump frequency converter through analog output and remote control terminals, improving the automation level. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 It is a connection diagram of the industrial gateway, data acquisition controller, controllable phase shifter, and mutual inductor of the present invention; Figure 3 It is a schematic structural diagram of the surface monitoring system of the submersible motor pump well installed on the line between the control cabinet of the submersible motor pump well and the downhole motor pump. Detailed Embodiments

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Embodiment 1 Please refer to Figure 1 and Figure 2 This is the first embodiment of the present invention. The embodiment provides a surface monitoring system for a submersible motor pump well, including A housing, which is a box made of metal processing. The box is lined with insulating phenolic board, with windproof and heat dissipation holes on the side. Legs for installation are installed at the lower part of the box, and an inspection window is provided in front of the box for convenient operation and maintenance inspection in the later stage; An industrial gateway, a data acquisition controller, a controllable phase shifter, and a mutual inductor are installed in the box. The current and voltage signals collected by the mutual inductor are transmitted into the controllable phase shifter through a line. After the controllable phase shifter corrects the phase, the electrical signal is transmitted into the data acquisition controller. The data acquisition controller converts the electrical signal into a digital signal, filters and calculates it to form complete electrical parameter data, including voltage, current, active power, etc., and generates polar coordinate system data corresponding to current and time. Finally, it is uploaded to the data center through the industrial gateway; A controllable phase shifter, which receives the alternating current signal transmitted by the mutual inductor, adjusts its phase, and outputs the adjusted electrical signal to the data acquisition controller. It has a 485 communication interface and can receive the setting data of the data acquisition controller; The data acquisition controller converts electrical signals into digital signals, filters and calculates them to form electrical parameter data including voltage, current, and active power, generates polar coordinate system data corresponding to current and time, and uploads the data through a 485 interface to connect with the industrial gateway. It can remotely control the frequency converter of the submersible electric pump well through analog output and remote control terminals, and its signal acquisition input terminals can connect to on-site instrument signals; The industrial gateway is upward compatible with 4G / 5G communication, network communication, and 485 communication, and downward connects with the data acquisition controller through 485 communication.

[0019] In this embodiment, preferably, the system is installed on the line between the control cabinet of the submersible electric pump well and the downhole electric pump. When high-voltage electricity flows through the system to the downhole electric pump, the system can detect relevant parameters and upload these parameters to the cloud.

[0020] In this embodiment, preferably, the data acquisition controller has a 485 communication interface connected to the controllable phase shifter to set the phase shift angle.

[0021] In this embodiment, preferably, it receives the alternating current signal transmitted by the mutual inductor and adjusts its phase. The implementation method is as follows: The current transformer and voltage transformer collect the alternating current signals (including the amplitude and phase information of current and voltage) in the submersible electric pump well line and transmit them through the line to the input port of the controllable phase shifter; The controllable phase shifter internally integrates a phase detection circuit to perform real-time sampling on the input current and voltage signals and analyze the phase difference between the two; due to the large volume of the high-voltage mutual inductor and the harmonic interference of the long cable, this phase difference usually causes the power factor calculation to be distorted; According to the phase shift setting instruction (such as the preset phase compensation value) sent by the data acquisition controller through the 485 communication interface, combined with the real-time detected phase deviation, the microprocessor inside the controllable phase shifter calculates the angle that needs to be adjusted (for example, if it is detected that the current signal lags the voltage signal by φ degrees, then the calculated compensation angle is -φ degrees); The controllable phase shifter adopts a control chip based on a digital signal processor (DSP) or a field programmable gate array (FPGA), and is equipped with an analog phase shift circuit (such as an RC phase shift network, a digital phase shift integrated circuit); when an alternating current signal is input, the control chip generates a control signal according to the calculated phase shift angle and drives the analog circuit to adjust the phase of the signal in real time; It interacts with the data acquisition controller through the 485 communication interface to dynamically calibrate the phase shift angle; for example, when the data acquisition controller calculates the power factor, if it finds that the error exceeds the threshold (such as ±0.5%), it sends a correction instruction to the controllable phase shifter to achieve closed-loop control and ensure the phase adjustment accuracy.

[0022] Embodiment 2 Please refer to Figure 1 and Figure 2 , which is the second embodiment of the present invention. This embodiment is based on the previous embodiment, and the difference is that: The data acquisition controller converts the electrical signal into a digital signal. After filtering and calculation, it forms electrical parameter data including voltage, current, and active power, and generates polar coordinate system data corresponding to current and time. The implementation method is as follows: The electrical signals (current and voltage analog quantities) output by the controllable phase shifter first pass through the signal conditioning circuit (including amplification, filtering, and isolation) of the data acquisition controller to remove high-frequency noise and interference, and ensure that the signal amplitude matches the input range of the analog-to-digital converter (ADC) (such as 0~5V or -10~10V); The conditioned analog electrical signal is converted into a digital signal through a high-precision ADC (such as 16-bit or 24-bit); for example, the voltage signal is connected to the ADC channel after voltage division, and the ADC discretizes the signal at the sampling frequency (such as 10kHz or higher) to generate a digital quantity sequence; The digital signal is filtered using a FIR (finite impulse response) or IIR (infinite impulse response) filter to eliminate harmonic and interference components; for example, for high-order harmonics (such as 5th and 7th harmonics) generated by variable frequency control, a band-pass or notch filter is designed to retain the fundamental wave component and improve data accuracy; The sampled values of the filtered digital signal are statistically analyzed, and the effective values of voltage and current are calculated through the root mean square algorithm; According to the instantaneous power formula P(t)=u(t)×i(t), the instantaneous power sampled values within one cycle are integrated and averaged to obtain the active power, where u(t) is the instantaneous voltage value and i(t) is the instantaneous current value; A polar coordinate system is established with time as the polar axis and the effective value of current as the polar radius; The current-time series in the time domain is converted into the polar coordinate format (r,θ), where r is the effective value of current and θ is the angle at the corresponding time point, forming a polar coordinate data sequence for subsequent uploading to the data center for trend analysis and fault diagnosis.

[0023] Although the embodiments of the present invention have been shown and described, as detailed in the above description, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Submersible electric pump well surface monitoring system, characterized in that: including a housing, a box body made of metal processing, and an insulating bakelite board lined inside the box body; a mutual inductor for collecting current and voltage signals; a controllable phase shifter that receives the alternating current signal transmitted by the mutual inductor, adjusts its phase, and outputs the adjusted electrical signal to the data acquisition controller. It has a 485 communication interface and can receive the setting data of the data acquisition controller; a data acquisition controller that converts the electrical signal into a digital signal, filters and calculates it to form electrical parameter data including voltage, current, and active power, generates polar coordinate system data corresponding to current and time, and uploads the data through a 485 interface to connect to an industrial gateway. It can remotely control the frequency converter of the submersible electric pump well through analog output and remote control terminals, and its signal acquisition input terminals can be connected to on-site instrument signals; an industrial gateway that is upward compatible with 4G / 5G communication, network communication, and 485 communication, and downward connects to the data acquisition controller through 485 communication.

2. The surface monitoring system for a submersible electric pump well according to claim 1, wherein: The system is installed on the line between the control cabinet of the submersible electric pump well and the downhole electric pump.

3. The surface monitoring system for a submersible electric pump well according to claim 1, wherein: The data acquisition controller has a 485 communication interface connected to the controllable phase shifter to set the phase shift angle.

4. The surface monitoring system for a submersible electric pump well according to claim 1, characterized in that: Receives the alternating current signal transmitted by the mutual inductor and adjusts its phase. The implementation method is as follows: The current transformer and voltage transformer collect the alternating current signal in the submersible electric pump well line and transmit it through the line to the input port of the controllable phase shifter; The controllable phase shifter internally integrates a phase detection circuit to perform real-time sampling on the input current and voltage signals and analyze the phase difference between the two; According to the phase shift setting instruction sent by the data acquisition controller through the 485 communication interface and combined with the real-time detected phase deviation, the microprocessor inside the controllable phase shifter calculates the angle that needs to be adjusted; The controllable phase shifter uses a control chip based on a digital signal processor or a field programmable gate array, paired with an analog phase shift circuit. When an alternating current signal is input, the control chip generates a control signal according to the calculated phase shift angle and drives the analog circuit to adjust the phase of the signal in real time; Interacts with the data acquisition controller through a 485 communication interface to dynamically calibrate the phase shift angle.

5. The surface monitoring system for a submersible electric pump well according to claim 4, wherein: The alternating current signal includes the amplitude and phase information of current and voltage.

6. The surface monitoring system for a submersible electric pump well according to claim 4, characterized in that: The phase shift circuit includes an RC phase shift network and a digital phase shift integrated circuit.

7. The surface monitoring system for a submersible electric pump well according to claim 1, characterized in that: The data acquisition controller converts the electrical signal into a digital signal, filters and calculates it to form electrical parameter data including voltage, current, and active power, and generates polar coordinate system data corresponding to current and time. The implementation method is as follows: The electrical signal output by the controllable phase shifter first passes through the signal conditioning circuit of the data acquisition controller to remove high-frequency noise and interference, ensuring that the signal amplitude matches the input range of the analog-to-digital converter; Converts the conditioned analog electrical signal into a digital signal through a high-precision analog-to-digital converter; Uses a FIR or IIR filter to filter the digital signal to eliminate harmonic and interference components; Performs sampling value statistics on the filtered digital signal and calculates the effective values of voltage and current through the root mean square algorithm; According to the instantaneous power formula P(t) = u(t) × i(t), the instantaneous power sampled values within one period are integrated and averaged to obtain the active power, where u(t) is the instantaneous voltage value and i(t) is the instantaneous current value; A polar coordinate system is established with time as the polar axis and the effective current value as the polar radius; The current-time series in the time domain is converted into the polar coordinate format (r, θ), where r is the effective current value and θ is the angle at the corresponding time point, forming a polar coordinate data series.

8. The surface monitoring system for a submersible electric pump well according to claim 1, characterized in that: It also includes a cloud that stores the parameters when the high-voltage electricity passes through the system detection.

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