Electro-dehydration system and method for measuring oil-water interface

Abstract

The application discloses an electric dehydration system and a high-viscosity crude oil oil-water interface position measuring method, and relates to the technical field of oil-water interface position measurement. The application uses signal processing technology to solve the problem that the oil-water interface measurement of an electric dehydrator in an oil field is easily interfered by an electric field and causes signal jump, and simultaneously realizes electric field energy monitoring, interface instrument electric quantity loading real-time fault diagnosis, expands the interface instrument fault monitoring capability, and for the first time invents an interface position measurement signal processing technology and method with active response and adaptive setting, and further improves the stability and reliability of oil-water interface measurement.

Description

Technical Field

[0001] This invention relates to the field of oilfield development technology, and in particular to an electro-dehydration system and a method for measuring the oil-water interface. Background Technology

[0002] Currently, heavy oil dehydration systems mainly employ open-loop systems, which release volatile organic compounds (VOCs) into the atmosphere. Furthermore, open-loop systems have long settling times, typically requiring temperatures above 80°C, consuming significant amounts of heat energy and failing to meet legal regulations and oilfield cost reduction and efficiency improvement requirements. To address this, engineers have innovated the crude oil dehydration process, upgrading from an open-loop to a closed-loop system. Electro-dehydration is currently the main research focus.

[0003] Closed-loop electrostatic dehydration processes typically require improved oil-water separation efficiency to reduce thermal energy consumption. In this process, oil-water interface measurement and control within the electrostatic dehydrator is a crucial step in ensuring its processing efficiency and effectiveness. Traditional oil-water interface measurement instruments primarily operate on buoyancy-based (float interface gauges, ball interface gauges, servo interface gauges, etc.), differential pressure-based (differential pressure interface gauges), and electrical-based (RF admittance interface gauges, guided wave radar interface gauges, capacitance interface gauges, microwave interface gauges, etc.). However, in typical operating conditions such as heavy oil dehydration and oil-water separation, the presence of a complex emulsion layer (oil-in-water or water-in-oil) between oil and water with similar densities, significant interface disturbances, and the strong adhesion of high-viscosity media, coupled with the complex coupling effects of inherent operating principles and media conditions, makes accurate measurement of the oil-water interface in heavy oil using traditional interface instruments consistently challenging.

[0004] In recent years, with the iterative upgrades of measurement and signal processing technologies, intelligent admittance interface meters have been gradually applied in Liaohe Oilfield and have basically met the needs of process production. The application of high-frequency current measurement admittance technology, three-terminal shielding technology, and multi-variable measurement technology has improved the accuracy of oil-water interface measurement to a certain extent. However, in the application scenario of oil-water interface measurement in electrostatic dehydrators, there are alternating current (AC), direct current (DC), or AC / DC dual electric fields. That is, there is always an electric field between the electrodes and between the electrodes and the shell, whose intensity and direction change periodically (or remain unchanged) with the power supply frequency. In an electrostatic field, capacitance depends on the structure, geometry, size of the electrostatic dehydrator, and the dielectric constant of the oil. However, in an alternating electromagnetic field, capacitance is easily affected by the superposition of multiple factors. Taking the AC variable frequency electrode electric field as an example, at low frequencies, the influence of capacitance changes with the frequency of the alternating electric field can be disregarded, and the given capacitance can be considered as a constant. However, at high frequencies, the relationship between capacitance and external field frequency (dielectric constant and magnetic permeability of the medium) must be considered. That is, the high voltage field strength and current changes will have a coupling effect on the electric field of the high-frequency intelligent admittance electrode plate. The decoupling operation of the interface instrument signal processing unit is lacking, resulting in random jumps in the actual measured value of the interface, which fluctuate greatly and cannot achieve stable and accurate measurement and automated operation of the oil-water interface. On-site, the only way to resist electric field interference is often to install a shielded waveguide.

[0005] Therefore, existing technologies still need improvement. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention proposes an electro-dehydration system and its oil-water interface measurement method to solve the technical problem of measurement signal distortion in existing heavy oil electro-dehydration systems.

[0007] To address the aforementioned technical problems, some embodiments of the present invention disclose a method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system, comprising: during the oil-water interface measurement, removing the electric field energy coupled in the capacitor in the alternating electromagnetic field to obtain the true value of the capacitance.

[0008] In some embodiments, eliminating the electric field energy coupled to the capacitor in the alternating electromagnetic field includes: using the superposition principle to derive the electric field energy coupled to the capacitor in the alternating electromagnetic field.

[0009] In some embodiments, eliminating the electric field energy coupled in the capacitor in an alternating electromagnetic field includes: determining the electric field distribution inside the dielectric under alternating electromagnetic field conditions, using Maxwell's integral equations, applying the superposition principle to infinitely approximate the electric field distribution, and then obtaining the electric field energy.

[0010] In some embodiments, the oil-water interface measurement is achieved using an intelligent admittance interface instrument.

[0011] In some embodiments, oil-water interface measurement is used in the closed dehydration process of crude oil in an electrostatic dehydrator.

[0012] In some embodiments, the true capacitance value is obtained by eliminating the influence of electromagnetic interference frequencies using the following formula:

[0013] In the formula, C is the actual value of the capacitance; ρ is the dielectric constant; r is the cross-sectional radius of the electrostatic dehydrator; This refers to the distance between the plates; ρ is the magnetic permeability in vacuum; ω is the angular frequency.

[0014] In some embodiments, eliminating the influence of electromagnetic interference frequencies to obtain the true capacitance value includes: Calculate the total electric field energy of a capacitor in an alternating electromagnetic field; The capacitance in the alternating electromagnetic field is decoupled based on the total electric field energy.

[0015] In some embodiments, calculating the total electric field energy of a capacitor in an alternating electromagnetic field includes: determining the electric field distribution inside the dielectric under alternating electromagnetic field conditions, using Maxwell's integral equations, and applying the superposition principle to infinitely approximate the electric field distribution, thereby obtaining the total electric field energy.

[0016] In some embodiments, the calculation of the total electric field energy includes: Based on the first magnetic field generated in the heavy oil medium by the electric field between the plates that varies with the operating conditions, and the second electric field generated in the heavy oil medium by the first magnetic field that varies with time, the second electric field is superimposed on the first electric field to correct the first electric field and obtain the first corrected electric field. Based on the second magnetic field generated by the second electric field in the heavy oil medium, and the third electric field generated by the second magnetic field in the heavy oil medium, the third electric field is superimposed on the first modified electric field to obtain the second modified electric field.

[0017] In some embodiments, the calculation of the total electric field energy further includes: Using the second revised electric field as the actual electric field strength, the electric field distribution inside the medium under alternating electromagnetic field conditions is obtained, and then the total electric field energy is obtained.

[0018] In some embodiments, the total electric field energy is calculated using the following formula:

[0019] In the formula, Q is the total electric field energy; ρ is the dielectric constant; r is the cross-sectional radius of the electrostatic dehydrator; This refers to the distance between the plates; ρ is the magnetic permeability in vacuum; E0 is the angular frequency; E0 is the initial electric field intensity vector. This is a phase change.

[0020] In some embodiments, decoupling calculations of capacitance in the alternating electromagnetic field based on the total electric field energy include: The actual capacitance value of the intelligent admittance interface instrument after removing the superimposed electric field charge is calculated by back-calculating the actual working capacitance of the intelligent admittance interface instrument.

[0021] The actual working capacitance value refers to the value directly measured by the intelligent admittance interface instrument (i.e., the data without processing).

[0022] In some embodiments, the oil-water interface measurement uses an intelligent admittance interface instrument to obtain the true capacitance values ​​at different heights, and the oil-water interface is obtained based on the measured true capacitance values.

[0023] On the other hand, this invention also discloses an electro-dehydration system, including a module for eliminating the influence of electromagnetic interference frequency. The module is used to eliminate the electric field energy coupled in the capacitor in the alternating electromagnetic field during oil-water interface measurement in order to obtain the true value of the capacitor.

[0024] In some embodiments, the device includes an electrostatic dehydrator, a smart admittance interface device, and an electrode plate. The electrode plate is installed in the electrostatic dehydrator, and a channel for the smart admittance interface device to pass through is provided in the middle of the electrode plate. The smart admittance interface device is installed vertically in the electrostatic dehydrator.

[0025] In some embodiments, the electromagnetic interference frequency elimination module is integrated into the data acquisition and processing unit of the intelligent admittance interface instrument.

[0026] In some embodiments, the electromagnetic interference frequency interference elimination module is connected to the data acquisition and processing unit of the intelligent admittance interface instrument to perform decoupling operations on the data acquired by the intelligent admittance interface instrument.

[0027] In some embodiments, the electro-dehydration system employs the aforementioned method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system.

[0028] This invention also discloses a computer device, which includes a processor, an input device, an output device, and a memory. The processor, input device, output device, and memory are interconnected. The memory is used to store a computer program, which includes program instructions. The processor is configured to call the program instructions to execute the aforementioned anti-distortion method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system.

[0029] This invention also discloses a computer-readable storage medium storing a computer program, the computer program including program instructions, which, when executed by a processor, cause the processor to perform the aforementioned anti-distortion method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system.

[0030] By adopting the above technical solution, the present invention has at least the following beneficial effects: This invention provides an electro-dehydration system and its oil-water interface measurement method. It utilizes signal processing technology to address the problem of signal jumps caused by electric field interference in oil-water interface measurement in oilfield electro-dehydrators. Simultaneously, it enables electric field energy monitoring and real-time fault diagnosis of interface instrument charge loading, expanding the interface instrument's fault monitoring capabilities. Furthermore, it is the first to invent an interface measurement signal processing technology and method with active response and adaptive tuning, further improving the stability and reliability of oil-water interface measurement. This promotes the iterative upgrading of new closed-loop electro-dehydration processes and key equipment technologies, enhancing the core competitiveness of dehydration processes. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a partial structural schematic diagram of an electro-dehydration system disclosed in some embodiments of the present invention; Figure 2 This is a schematic diagram of the structure of an electro-dehydration system disclosed in some embodiments of the present invention.

[0033] Explanation of reference numerals in the attached figures: 1. Electrostatic dehydrator; 2. Intelligent admittance interface instrument; 3. Electrode plate; 4. Data acquisition and processing unit. Detailed Implementation

[0034] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure. This disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0035] These embodiments are provided to make the disclosure thorough and complete, and to fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0036] Furthermore, the terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Terms such as "including" or "contains" mean that the element preceding the word covers the element listed after the word, and do not exclude the possibility of covering other elements as well.

[0037] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the specific meaning of each term in this disclosure can be understood by those skilled in the art as appropriate. All terms used in this disclosure have the same meaning as understood by those skilled in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted with an idealized or highly formalized meaning, unless expressly defined herein.

[0038] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0039] This invention discloses an anti-distortion method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system. During oil-water interface measurement, the influence of electromagnetic interference frequencies is eliminated to obtain the true capacitance value, thus achieving anti-distortion measurement of the electro-dehydrator. Specifically, the superposition principle can be applied, and Maxwell's integral equation can be used to derive the electric field energy coupled to the capacitor in the alternating electromagnetic field, thereby determining the true capacitance value. An integrated calculation program can be embedded in the interface instrument's data acquisition and signal processing unit to eliminate the influence of electromagnetic interference frequencies, complete decoupling calculations, and achieve anti-distortion measurement of the oil-water interface in the electro-dehydrator. This falls under the field of instrumentation automation and can be implemented through an embedded calculation program (software or written) and a data acquisition and processing unit (optional).

[0040] The present invention discloses a method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system with anti-distortion properties in some embodiments, wherein the viscosity of the high-viscosity crude oil is not less than 5000 mPa·s. This includes: Step 1: Calculation of the electric field energy of a capacitor in an alternating electromagnetic field.

[0041] like Figure 1As shown, since the superimposed charge is not uniformly distributed on the measuring rod of the interface instrument in the alternating electromagnetic field of the electro-dehydrator 1, and the electric field strength is different from that of the tank wall in the lateral direction, the electrode plate 3 is not an equipotential body and the electric field distribution is relatively complex. The electric field energy contained in the capacitor space needs to be calculated from the electric field distribution inside the medium under the alternating electromagnetic field. Maxwell's integral equation is used, and the superposition principle is applied to infinitely approximate the electric field distribution, and then the electric field energy is obtained.

[0042] Specifically, the cross-sectional area of ​​the measuring rod of the intelligent admittance interface instrument 2 is S (known), the dielectric constant of the heavy oil (or water) filling the space between it and the wall of the electro-dehydrator is ε, and the distance between the plates is... ,like Figure 1 As shown.

[0043] Initially, the sum of the inherent charge and the periodically changing charge of the electric field coupling on the measuring rod of the intelligent admittance interface instrument 2 is Q (which can be obtained by weighting the electrical parameter data and the inherent set value of the interface instrument). At this time, the electric field strength between the plates is E1: (1) (2)

[0044] (3) The electric field E1, which varies with the operating conditions, excites a magnetic field H1 in the heavy oil medium. The time-varying magnetic field H1 then excites a new electric field E2. This new electric field is superimposed on the original electric field E1, performing the first correction to E1. The changing electric field E2 then excites a new magnetic field H2, and so on. By superimposing all the secondary electric fields onto the original electric field, the actual electric field distribution can be obtained. Considering the corrections, this cycle continues. The actual electric field strength is approximately: (4) According to Maxwell's integral equation, we get: (5) (6) In equations (5) and (6), the integral loop L refers to a general loop, and S is the area enclosed by L as its boundary. In equation (5), j should include both displacement current and conduction current. Because the conductivity of heavy oil is very small, the conduction current can be neglected, and only the displacement current needs to be considered. The displacement current density caused by the changing electric field E1 is: (7) Taking a circular integral loop L1 with a transverse radius of r, we can obtain the following by combining equations (5) and (7):

[0045]

[0046] Taking a longitudinal rectangular integral loop L2, the electric field E2 excited by the changing magnetic field H1 is calculated using equation (6). E1 is then corrected for the first time and so on.

[0047]

[0048]

[0049] (8) During the correction process, the electric field strength can be kept constant at E1, meaning the correction amount of E2 at that point is zero, thus yielding: (9) From equations (8) and (9), we can obtain: (10) Combining equation (4) and the calculated electric field strength, the electric field energy density is:

[0050] The total electric field energy is:

[0051]

[0052]

[0053] With the total electric field energy obtained, electric field energy monitoring and real-time fault diagnosis of interface instrument charge loading can be realized (compared with the transmission frequency setting value).

[0054] Step 2: Calculation of capacitor decoupling in alternating electromagnetic field.

[0055] According to the definition of capacitance, the capacitance can be obtained as:

[0056] (11)

[0057] As can be seen from equation (11), the actual working capacitance of the intelligent admittance interface instrument is not only related to the geometry, size, and electrical charge of the electro-dehydrator, but also to the electrical properties of the heavy oil. and magnetic properties The relevant information can be obtained by referring to tables and related literature. By reverse deduction, the true capacitance value after removing the superimposed electric field charge from the interface instrument can be obtained, and then the true oil-water interface can be detected.

[0058] The above-described process of the present invention can be implemented by the data acquisition and processing unit 4, such as... Figure 2 The method involves collecting on-site oil-water interface parameters and electrical parameters. The data acquisition unit integrates a built-in decoupling calculation program (software) to perform calculations and achieve intelligent and stable measurement of the oil-water interface. The data acquisition and processing unit can be integrated with the intelligent admittance interface instrument's separate display unit, or it can be set up independently. This unit collects parameter adjustment data from the electric dehydrator, combines it with interface instrument detection data, and, through an embedded decoupling calculation program for the loading capacitor, eliminates the influence of electromagnetic interference frequencies, completes the decoupling calculation, and achieves intelligent and stable measurement of the oil-water interface in the electric dehydrator.

[0059] The anti-distortion method for measuring the oil-water interface of high-viscosity crude oil in the above embodiments of this invention ensures that the frequency of oil-water interface data acquisition jumps is no more than once per year after use. Real-time monitoring of the electric field energy data of the electro-dehydrator is achieved with an accuracy of no less than ±2.0%. The method can analyze and determine the trend of changes in the applied charge of the interface meter, enhancing the fault diagnosis function of the interface meter. This fills the gap in anti-distortion signal processing technology for oil-water interface detection.

[0060] This invention also discloses an electro-dehydration system, such as... Figure 1 As shown, it employs the aforementioned method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system. Generally, it may include an electro-dehydrator 1, an intelligent admittance interface meter 2, and an electrode plate 3. The electrode plate is installed in the electro-dehydrator, and a channel for the intelligent admittance interface meter to pass through is provided in the middle of the electrode plate, which is vertically installed in the electro-dehydrator. The method of the aforementioned embodiment can be applied to the electro-dehydration system in two ways: one is that the intelligent admittance interface meter integrates a data acquisition and processing unit 4, and the data acquisition and processing unit 4 processes the data using the aforementioned method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system. The other is that it also includes a data acquisition and processing unit 4, which is connected to the intelligent admittance interface meter 2 and performs decoupling calculations on the data acquired by the intelligent admittance interface meter 2 using the aforementioned method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system.

[0061] This invention also discloses a computer device, including a processor, an input device, an output device, and a memory, which are interconnected. The memory stores a computer program, which includes program instructions. The processor is configured to call the program instructions to execute the aforementioned anti-distortion method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system.

[0062] This invention also discloses a computer-readable storage medium storing a computer program, the computer program including program instructions, which, when executed by a processor, cause the processor to perform the aforementioned method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system.

[0063] Taking the Shusi-Lian closed dehydration project of Liaohe Oilfield as an example, an oil-water interface meter (such as...) is installed on the electric dehydrator. Figure 2 As shown in the figure, an emulsion layer measuring instrument and a low liquid level alarm are set up. A data acquisition and processing unit is set up in the on-site duty room to measure and display the oil-water interface of heavy crude oil in real time. The on-site oil-water interface instrument is equipped with a shielded waveguide, which can basically achieve the shielding of interference. At the same time, a decoupling calculation program is embedded in the data acquisition and processing unit to collect relevant variables (with the function of manual parameter input). This decoupling calculation program runs the anti-distortion method for measuring the oil-water interface of high viscosity crude oil in the electro-dehydration system of the above embodiment, further reducing the influence of electric field coupling interference and realizing stable measurement of the oil-water interface.

[0064] In summary, the electro-dehydration system and its method, equipment, and storage medium for measuring the oil-water interface of high-viscosity crude oil disclosed in this invention, through principle analysis, theoretical calculation, and practical verification, demonstrate significantly improved reliability, stability, advanced technology, and especially anti-distortion capability compared to traditional interface measurement instruments, playing a crucial role in real-time monitoring of the oil-water interface. It greatly enhances the dehydration efficiency and quality of closed-loop dehydration equipment for heavy oil, and is an important technical component for realizing the new closed-loop electro-dehydration process and core equipment (new type of electro-dehydrator), supporting the formation of core processes and equipment. Furthermore, it offers strong guidance and reference for interface measurement under other complex operating conditions.

[0065] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0066] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner.

Claims

1. A method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system, characterized in that, include: When measuring the oil-water interface, the electric field energy coupled into the capacitor in the alternating electromagnetic field is removed to obtain the true value of the capacitance.

2. The method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system according to claim 1, characterized in that, Eliminating the electric field energy coupled to the capacitor in an alternating electromagnetic field includes: using the superposition principle to derive the electric field energy coupled to the capacitor in an alternating electromagnetic field.

3. The method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system according to claim 1, characterized in that, Eliminating the electric field energy coupled into the capacitor in an alternating electromagnetic field involves: determining the electric field distribution inside the dielectric under alternating electromagnetic field conditions, using Maxwell's integral equations, applying the superposition principle to infinitely approximate the electric field distribution, and then obtaining the electric field energy.

4. The method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system according to claim 1, characterized in that, The oil-water interface measurement is achieved using an intelligent admittance interface instrument.

5. The method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system according to claim 1, characterized in that, Used for measuring the oil-water interface in the closed dehydration process of crude oil in an electrostatic dehydrator.

6. The method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system according to claim 1, characterized in that, The true capacitance value is obtained by eliminating the influence of electromagnetic interference frequencies using the following formula: In the formula, C is the actual value of the capacitance; ρ is the dielectric constant; r is the cross-sectional radius of the electrostatic dehydrator; This refers to the distance between the plates; ρ is the magnetic permeability in vacuum; ω is the angular frequency.

7. The method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system according to claim 1, characterized in that, After eliminating the influence of electromagnetic interference frequencies, the true capacitance values ​​are obtained as follows: Calculate the total electric field energy of a capacitor in an alternating electromagnetic field; The capacitance in the alternating electromagnetic field is decoupled based on the total electric field energy.

8. The method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system according to claim 7, characterized in that, Calculating the total electric field energy of a capacitor in an alternating electromagnetic field involves: determining the electric field distribution inside the dielectric under alternating electromagnetic field conditions; using Maxwell's integral equations; and applying the superposition principle to infinitely approximate the electric field distribution, thereby obtaining the total electric field energy.

9. The method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system according to claim 7, characterized in that, The calculation of the total electric field energy includes: Based on the first magnetic field generated in the heavy oil medium by the electric field between the plates that varies with the operating conditions, and the second electric field generated in the heavy oil medium by the first magnetic field that varies with time, the second electric field is superimposed on the first electric field to correct the first electric field and obtain the first corrected electric field. Based on the second magnetic field generated by the second electric field in the heavy oil medium, and the third electric field generated by the second magnetic field in the heavy oil medium, the third electric field is superimposed on the first modified electric field to obtain the second modified electric field.

10. The method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system according to claim 9, characterized in that, The calculation of the total electric field energy also includes: Using the second revised electric field as the actual electric field strength, the electric field distribution inside the medium under alternating electromagnetic field conditions is obtained, and then the total electric field energy is obtained.

11. The method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system according to claim 7, characterized in that, The total electric field energy is calculated using the following formula: In the formula, Q is the total electric field energy; ρ is the dielectric constant; r is the cross-sectional radius of the electrostatic dehydrator; This refers to the distance between the plates; ρ is the magnetic permeability in vacuum; E0 is the angular frequency; E0 is the initial electric field intensity vector. This is a phase change.

12. The method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system according to claim 7, characterized in that, Decoupling calculation of capacitance in alternating electromagnetic fields based on the total electric field energy includes: The actual capacitance value of the intelligent admittance interface instrument after removing the superimposed electric field charge is calculated by back-calculating the actual working capacitance of the intelligent admittance interface instrument.

13. The method for measuring the oil-water interface of high-viscosity crude oil in an electro-dehydration system according to claim 1, characterized in that, The oil-water interface measurement uses an intelligent admittance interface instrument to obtain the true capacitance values ​​at different heights, and the oil-water interface is obtained based on the measured true capacitance values.

14. An electro-dehydration system, characterized in that, It includes a module for eliminating the influence of electromagnetic interference frequencies. This module is used to eliminate the electric field energy coupled into the capacitor in the alternating electromagnetic field during oil-water interface measurement in order to obtain the true value of the capacitor.

15. The electro-dehydration system according to claim 14, characterized in that, The device includes an electrostatic dehydrator, an intelligent admittance interface device, and an electrode plate. The electrode plate is installed in the electrostatic dehydrator, and a channel for the intelligent admittance interface device to pass through is provided in the middle of the electrode plate. The intelligent admittance interface device is installed vertically in the electrostatic dehydrator.

16. The electro-dehydration system according to claim 15, characterized in that, The electromagnetic interference frequency elimination module is integrated into the data acquisition and processing unit of the intelligent admittance interface instrument.

17. The electro-dehydration system according to claim 15, characterized in that, The electromagnetic interference frequency elimination module is connected to the data acquisition and processing unit of the intelligent admittance interface instrument.

18. The electro-dehydration system according to any one of claims 14-17, characterized in that, The method for measuring the oil-water interface of high-viscosity crude oil using the electro-dehydration system described in any one of claims 1-13 is adopted.

Images