CN116625457A - Dual-purpose liquid level sensor and liquid level measurement method thereof - Google Patents
Dual-purpose liquid level sensor and liquid level measurement method thereof Download PDFInfo
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- CN116625457A CN116625457A CN202310405327.6A CN202310405327A CN116625457A CN 116625457 A CN116625457 A CN 116625457A CN 202310405327 A CN202310405327 A CN 202310405327A CN 116625457 A CN116625457 A CN 116625457A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The application discloses a dual-purpose liquid level sensor, which relates to the technical field of multiphase flow medium liquid level measurement, and is characterized in that an outer shielding shell for preventing external electric signals is used, a transverse insulating cylinder is used, different fluid media are contacted with different electrode plates in stages in the sinking process of the liquid level sensor, more accurate determination of interfaces of different fluid media is realized, a vacuum airtight gap is reserved between the outer shielding shell and the transverse insulating cylinder, the vacuum airtight gap is used for arranging an electric wire and an electric switch, a sliding isolation plate and an isolation plate switch mechanism are also used for isolating the electrode plates from contacting the fluid media, and further the detection accuracy of the electrode plates is prevented from being influenced by the fluid media.
Description
Technical Field
The application relates to the technical field of multiphase flow medium liquid level measurement, in particular to a dual-purpose liquid level sensor and a liquid level measurement method thereof.
Background
In the oil-gas-water three-phase separator, various mediums such as oil, gas, water, emulsion and the like are contained, and the mediums are different in density and mutually incompatible, exist in a layered mode in the separator, and the liquid level of the mediums also changes at moment along with the progress of oil field production, so that the liquid level of the mediums needs to be measured in real time to ensure the safety of oil-gas production.
For measuring the level of different media, the following techniques are applied:
1. the technique of capacitance tomography (Electrical capacitance tomography, ect) is to use multiphase flow media with different dielectric constants to obtain the spatial distribution information of the relative dielectric constants and related process parameters in a container or a pipeline by measuring the capacitance value between the electrodes of a capacitance sensor array. Because the dielectric constants of the oil and the emulsion in the separator are different, when the sensor moves upwards or downwards to the oil-gas interface or the oil-emulsion interface, the sensor moves continuously, the dielectric constant of the mixed medium changes, the measured capacitance value and the ect reconstructed image also change, and the liquid level of the medium can be accurately calculated according to the capacitance change value acquired by the data acquisition system.
2. The technique of electrical resistance tomography (Electrical resistance tomography, ert) is to use different media having different conductivities and to obtain the distribution of the media within the conduit or vessel by measuring the conductivity distribution within the conduit or vessel. In the separator, since the water has a certain conductivity, the ect can not normally measure the interface between the water and the emulsion, and ert can function, when the sensor moves to the interface between the water and the emulsion, the resistance value detected by ert can change due to the change of the conductivity of the medium, and the distribution ratio of the emulsion and the water can be reconstructed according to the resistance change value, so that the water level value can be calculated.
The existing capacitance/resistance tomography liquid level measurement technology needs to integrate ect measurement equipment and ert measurement equipment at the same time, so that the installation space of the equipment is greatly increased, and the required ect/ert electrode plates and cables are multiplied, so that the hardware cost and the installation and maintenance cost of the equipment are increased; furthermore ect/ert, when operated simultaneously, can cause electrical signal interference between electrode pads and between cables, which can also reduce the accuracy of the final level measurement.
Disclosure of Invention
The object of the present application is to provide a level sensor that can be used with both ect and ert measurement modes.
The present application therefore discloses a dual-purpose liquid level sensor comprising:
the outer shielding shell is used for shielding external electromagnetic wave interference;
the transverse insulating cylinder is arranged on the inner side of the outer shielding shell, a vacuum airtight gap is reserved between the transverse insulating cylinder and the outer shielding shell, a plurality of sliding grooves are formed in the inner side of the transverse insulating cylinder in a surrounding mode, and embedded grooves are formed in the bottoms of the sliding grooves;
the electrode plates are arranged in the embedded groove;
the sliding isolation plates are arranged in the sliding grooves;
and the plurality of isolation plate switch mechanisms are arranged on the inner side of the transverse insulating cylinder and are used for driving the sliding isolation door to move in the sliding chute.
The application discloses a dual-purpose liquid level sensor, which is provided with an outer shielding shell for preventing external electric signals, a transverse insulating cylinder, and a vacuum airtight gap which is used for arranging electric wires and an electric switch, and a sliding isolation plate and an isolation plate switch mechanism, wherein different fluid media are contacted with different electrode plates in stages in the sinking process of the liquid level sensor, so that more accurate determination of interfaces of different fluid media is realized, and the vacuum airtight gap is reserved between the outer shielding shell and the transverse insulating cylinder, and is used for isolating the electrode plates from contacting the fluid media, thereby avoiding the influence of the fluid media on the detection accuracy of the electrode plates.
In some embodiments of the present application, a specific structure of a separator switching mechanism is disclosed, the separator switching mechanism comprising:
the first arc-shaped guide rod is arranged at one end of the sliding isolation plate, a first arc-shaped sliding pore canal is arranged on the inner wall of the chute at the position corresponding to the first arc-shaped guide rod, and one end of the first arc-shaped guide rod is inserted into the first arc-shaped sliding pore canal;
the first spring is in a compressed state, is sleeved on the side part of the first arc-shaped guide rod, and two ends of the first spring are connected between the sliding isolation plate and the sliding chute;
the switch motor is arranged on the transverse insulating cylinder, a rotating wheel is sleeved on an output shaft of the switch motor, a linkage rope is wound on the side part of the rotating wheel, and the end head of the linkage rope is connected with the end head of the first arc-shaped guide rod.
In some embodiments of the application, there is also disclosed the separator switch mechanism, which is a double spring mechanical switch.
In some embodiments of the present application, to ensure a stable descent of the liquid level sensor, further comprising: the balancing weight is arranged at the side part of the outer shielding shell.
In some embodiments of the present application, there is also disclosed a liquid level measuring method of a dual-purpose liquid level sensor, including:
acquiring a liquid level measurement mode, driving a separator switch to drive a sliding separator to seal an electrode plate if the liquid level measurement mode is a ect measurement mode, and determining that the separator switch drives the sliding separator to open a discharge electrode plate if the liquid level measurement mode is a ert measurement mode, wherein the ect measurement mode is used for detecting dielectric constant distribution of multiphase flow media, and the ert measurement mode is used for detecting conductivity distribution of the multiphase flow media;
determining the dielectric constant distribution information detected according to the ect measurement mode, determining a gas/oil interface and an oil/emulsion interface according to the dielectric constant distribution information, and determining the heights of the gas/oil interface and the oil/emulsion interface according to the depth of penetration of the liquid level sensor;
and determining the water/emulsion interface according to the conductivity distribution information detected by the ert measurement mode and the height of the water/emulsion interface according to the depth of penetration of the liquid level sensor.
In some embodiments of the application, a method of more specifically determining a gas/oil interface, an oil/emulsion interface, and a water/emulsion interface is disclosed, further comprising:
when the liquid level measurement mode is ect measurement mode, the method of determining dielectric constant distribution information includes:
sequentially applying preset voltages to different electrode plates in a circulating way, simultaneously acquiring the real-time voltage of the other opposite electrode plate, and calculating to obtain the voltage difference between the two opposite electrode plates;
if the voltage difference between the two opposite electrode plates jumps, determining that the liquid level sensor moves to a gas/oil interface or an oil/emulsion interface, and respectively determining the height of the gas/oil interface or the oil/emulsion interface according to the sinking depth of the liquid level sensor;
determining the section of the gas and the oil based on the characteristics of the voltage difference between the electrode plates in the upper section and the lower section of the gas/oil interface;
determining the section of the oil and the emulsion based on the characteristics of the voltage difference between the electrode plates in the upper section and the lower section of the oil/emulsion interface;
when the liquid level measurement mode is ert measurement mode, the method of determining conductivity distribution information includes:
applying current excitation to different electrode plates in a circulating way, and simultaneously obtaining the inter-electrode plate voltage between the electrode plate subjected to the current excitation and the opposite electrode plate;
if the voltage between the electrode plates of the two opposite electrode plates jumps, determining that the liquid level sensor moves to a water/emulsion interface, and respectively determining the height of the water/emulsion interface according to the sinking depth of the liquid level sensor;
and determining the section of the water and the emulsion based on the characteristics of the voltage between the electrode plates in the upper section and the lower section of the water/emulsion interface.
In some embodiments of the application, a method is disclosed for enabling the determination of various fluid media by means of an image, comprising:
establishing a multiphase flow media profile for the liquid storage device;
constructing a gas/oil dynamic boundary on the multiphase flow medium distribution diagram according to the height determined by the gas/oil interface;
constructing an oil/emulsion dynamic boundary on the multiphase flow media distribution map according to the height determined by the oil/emulsion interface;
a water/emulsion dynamic boundary is constructed on the multiphase flow media distribution map based on the height determined by the water/emulsion interface.
In some embodiments of the application, a method of determining a characteristic of a voltage difference between electrode sheets in an upper and lower section of a water/emulsion interface, a characteristic of an inter-electrode sheet voltage between electrode sheets in an upper and lower section of a gas/oil interface, and a characteristic of an inter-electrode sheet voltage between electrode sheets in an upper and lower section of an oil/emulsion interface is disclosed, the characteristic of the voltage difference between electrode sheets in the upper and lower section of the water/emulsion interface comprising a dielectric constant profile, the characteristic of the inter-electrode sheet voltage between electrode sheets in the upper and lower section of the gas/oil interface comprising a conductivity profile, the characteristic of the inter-electrode sheet voltage between electrode sheets in the upper and lower section of the oil/emulsion interface comprising a conductivity profile;
the method for determining the dielectric constant distribution comprises the following steps:
constructing a sensitive field matrix with dielectric constant distribution;
constructing a rotation matrix of a sensitive field matrix with dielectric constant distribution according to an LBP algorithm, and calculating the dielectric constant distribution;
the expression of the dielectric constant distribution is: g=s T λ；
Wherein lambda is a normalized capacitance value, S is a normalized sensitive field matrix, and g is dielectric constant distribution;
constructing a sensitive field matrix of conductivity distribution;
according to an LBP algorithm, constructing a rotation matrix of a sensitive field matrix of conductivity distribution, and calculating the conductivity distribution;
the conductivity distribution is expressed as: g=s T V；
Wherein S is a normalized sensitive field matrix, V is a normalized voltage vector, and g is conductivity distribution.
In some embodiments of the present application, a method of determining a sensitivity field matrix is disclosed, the sensitivity field matrix being simulated via a comsol simulation software.
The technical scheme of the application is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a schematic diagram of a dual-purpose liquid level sensor and a liquid level measuring method thereof according to an embodiment of the present application;
FIG. 2 is an enlarged schematic view of FIG. 1 at A;
FIG. 3 is a schematic view of image reconstruction in ert mode;
fig. 4 is a schematic diagram of image reconstruction in ect mode.
Reference numerals
1. An outer shield shell; 2. a transverse insulating cylinder; 3. vacuum sealing the gap; 4. a chute; 5. an electrode sheet; 6. sliding the isolation plate; 7. a first arcuate guide bar; 8. a first spring; 9. a rotating wheel; 10. balancing weight; 11. a first arcuate sliding tunnel; 12. and (3) switching the motor.
Detailed Description
The technical scheme of the application is further described below through the attached drawings and the embodiments.
The technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings and specific embodiments, it being understood that the preferred embodiments described herein are for illustrating and explaining the present application only and are not to be construed as limiting the scope of the present application, and that some insubstantial modifications and adaptations can be made by those skilled in the art in light of the following disclosure. In the present application, unless explicitly specified and defined otherwise, technical terms used in the present application should be construed in a general sense as understood by those skilled in the art to which the present application pertains. The terms "connected," "fixedly," "disposed" and the like are to be construed broadly and may be fixedly connected, detachably connected or integrally formed; can be directly connected or indirectly connected through an intermediate medium; either mechanically or electrically. Unless explicitly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances. Unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact through an intervening medium. Moreover, a first feature being "above" or "over" or "upper" a second feature may be a first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under" or "beneath" or "under" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is level less than the second feature. Relational terms such as first, second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
Examples:
the present application therefore discloses a dual-purpose liquid level sensor, see fig. 1 and 2, comprising: the device comprises an outer shielding shell 1, a transverse insulating cylinder 2, a plurality of electrode plates 5, a sliding isolation plate 6 and an isolation plate switch mechanism.
The outer shielding shell 1 is used for shielding electromagnetic wave interference from the outside; the transverse insulating cylinder 2 is arranged on the inner side of the outer shielding shell 1, a vacuum airtight gap 3 is reserved between the transverse insulating cylinder 2 and the outer shielding shell 1, a plurality of sliding grooves 4 are formed in the inner side of the transverse insulating cylinder 2 in a surrounding mode, and embedded grooves are formed in the bottoms of the sliding grooves 4; the electrode plate 5 is arranged in the embedded groove; the sliding isolation plate 6 is arranged in the chute 4; the isolation board switch mechanism is arranged on the inner side of the transverse insulating cylinder 2 and is used for driving the sliding isolation door to move in the sliding chute 4.
The application discloses a dual-purpose liquid level sensor, which is provided with an outer shielding shell 1 for preventing external electric signals, a transverse insulating cylinder 2, and a vacuum sealing gap 3, wherein different fluid media are contacted with different electrode plates 5 in stages in the sinking process of the liquid level sensor, the interface of different fluid media is more accurately determined, the vacuum sealing gap 3 is reserved between the outer shielding shell 1 and the transverse insulating cylinder 2 and is used for arranging electric wires and an electric switch, a sliding isolation plate 6 and an isolation plate switch mechanism are also used for isolating the electrode plates 5 from contacting the fluid media, and further the detection accuracy of the electrode plates 5 is prevented from being influenced by the fluid media.
In some embodiments of the present application, the electrode plates 5 are made of brass plates 8 with a thickness of 1mm, and are uniformly distributed on the transverse insulating cylinder 2 in a ring shape, and are mainly used for capacitance or conductivity values of fluid media. The transverse insulating cylinder 2 is a cylinder made of PEEK with the thickness of 4mm, is non-conductive, high-temperature-resistant and corrosion-resistant, and is mainly used for fixing the electrode plate 5; the outer shielding layer is mainly used for preventing the interference of external electric signals, and the manufacturing process is to paste a layer of conductive copper sheet on the outermost layer of the high-temperature corrosion-resistant plastic cylinder.
In some embodiments of the present application, a specific structure of a separator switching mechanism is disclosed, the separator switching mechanism comprising: a first arc-shaped guide rod 7, a first spring 8 and a switch motor 12.
The first arc-shaped guide rod 7 is arranged at one end of the sliding isolation plate 6, a first arc-shaped sliding pore canal 11 is arranged on the inner wall of the chute 4 at a position corresponding to the first arc-shaped guide rod 7, and one end of the first arc-shaped guide rod 7 is inserted into the first arc-shaped sliding pore canal; the first spring 8 is in a compressed state, the first spring 8 is sleeved on the side part of the first arc-shaped guide rod 7, and two ends of the first spring are connected between the sliding isolation plate 6 and the sliding chute 4; the switch motor 12 is arranged on the transverse insulating cylinder 2, a rotating wheel 9 is sleeved on an output shaft of the switch motor 12, a linkage rope is wound on the side part of the rotating wheel 9, and the end of the linkage rope is connected with the end of the first arc-shaped guide rod 7.
In the application process, the switch motor 12 is driven to rotate, so that the linkage rope can drag the first arc-shaped guide rod 7 to counteract the elastic force of the first spring 8, and the sliding isolation plate 6 slides in the sliding groove 4, so that the electrode plate 5 is opened.
In some embodiments of the application, there is also disclosed the separator switch mechanism, which is a double spring mechanical switch.
In some embodiments of the present application, the dual spring mechanical switch is composed of two sets of springs, one set of springs is in a compressed state and one set of springs is in a stretched state, the pushing force and the pulling force of the two sets of springs are balanced under normal conditions, when the two sets of springs need to be switched to a ert state, the electrode plate must contact a fluid medium, at the moment, the electric control switch controls the pushing force side baffle to pop up and bear a part of pushing force, so that the pulling force of the springs is greater than the pushing force, the springs can pull up the sliding isolation plate, so that the electrode plate can contact the fluid medium, when the two sets of springs are switched to a ect state, the electric control switch controls the pulling force side baffle to pop up and bear a part of pulling force, so that the pushing force of the springs is greater than the pulling force, the sliding isolation plate can be pushed to close, the electrode plate is isolated from the medium, and in order to prevent metal from conducting interference, the material of the springs should be made of nonconductive plastic materials. The sliding isolation sheet is matched with the double-spring mechanical switch, the sliding isolation sheet is mainly used for opening or isolating a channel of the electrode sheet, which is in contact with a medium, the ert mode sliding isolation sheet is pulled up, the ect mode sliding isolation sheet is closed and sealed, the manufacturing of the sliding isolation sheet needs precise mechanical and process design, the PEEK material which is high-temperature and high-pressure resistant and is nonconductive is selected in the aspect of material selection, and a plurality of layers of rubber sealing rings are arranged on the outer layer of the PEEK material, so that the sealing performance of the isolation sheet during closing is ensured. When ect or ert mode installation and replacement are needed, the computer control system transmits signals to the electric control box, the electric control box controls the electric control switch through the electric control wire, and finally the stretching state of the double-spring mechanical switch is controlled, 8 connecting wires of the electric control box and the electrode plates are needed, and SMA connecting wires are needed to be adopted for preventing the connecting wires from being interfered. The balancing weight mainly has two functions, namely, the weight of the sensor is increased, the sensor weight can be ensured to be larger than buoyancy, the sensor can move up and down, and the balance between the sensor and the steel wire is controlled, so that the sensor is prevented from automatically rotating in the up and down movement process.
When the sensor moves to the water or water/emulsion interface, the computer control and imaging system judges that the sensor should be in ert mode at the moment according to the acquired capacitance and conductivity values, so that signals for switching ert mode are sent to the electric control box, at the moment, the three-way switch in the electric control box is automatically switched to ert circuit module, meanwhile, the electric control box simultaneously controls the electric control switch in the sensor to enable the tension of the double-spring mechanical switch to be kept larger than the thrust, so that the sliding isolation sheet is pulled up, the electrode sheet is fully contacted with a medium, measured conductivity information is transmitted to the computer control and imaging system in real time, and liquid level calculation and imaging analysis are performed in real time.
When the sensor moves the oil/emulsion or the gas/oil interface, the computer control and imaging system judges that the sensor should be in ect mode at the moment according to the acquired capacitance and conductivity values, so that signals for switching ect mode are sent to the electric control box, at the moment, the three-way switch in the electric control box is automatically switched to ect circuit module, meanwhile, the electric control box simultaneously controls the electric control switch in the sensor to enable the thrust of the double-spring mechanical switch to be kept larger than the pulling force, the sliding isolation sheet is closed and sealed, the electrode sheet is completely isolated from the medium, measured capacitance information is transmitted to the computer control and imaging system in real time, and liquid level calculation and imaging analysis are performed in real time.
In some embodiments of the present application, to ensure a stable descent of the liquid level sensor, further comprising: and the balancing weight 10 is arranged at the side part of the outer shielding shell, and the balancing weight 10 is arranged at the side part of the outer shielding shell.
In some embodiments of the present application, there is also disclosed a liquid level measuring method of a dual-purpose liquid level sensor, including:
the first step, a liquid level measurement mode is obtained, if the liquid level measurement mode is ect measurement mode, a separation plate switch is driven to drive a sliding separation plate to seal an electrode plate, if the liquid level measurement mode is ert measurement mode, the separation plate switch is determined to drive the sliding separation plate to open a discharge electrode plate, wherein the ect measurement mode is used for detecting dielectric constant distribution of multiphase flow media, and the ert measurement mode is used for detecting conductivity distribution of the multiphase flow media.
And secondly, determining a gas/oil interface and an oil/emulsion interface according to the dielectric constant distribution information detected by the ect measurement mode and determining the height of the gas/oil interface and the oil/emulsion interface according to the depth of penetration of the liquid level sensor.
And thirdly, determining the water/emulsion interface according to the conductivity distribution information detected by the ert measurement mode and the height of the water/emulsion interface according to the downward detection depth of the liquid level sensor.
In some embodiments of the present application, referring to fig. 3 and 4, a method for determining more specifically a gas/oil interface, an oil/emulsion interface, and a water/emulsion interface is disclosed, further comprising:
when the liquid level measurement mode is ect measurement mode, the method of determining dielectric constant distribution information includes:
and sequentially applying preset voltages to different electrode plates in a circulating way, simultaneously acquiring the real-time voltage of the other opposite electrode plate, and calculating to obtain the voltage difference between the two opposite electrode plates.
If the voltage difference between the two opposite electrode plates jumps, determining that the liquid level sensor moves to the gas/oil interface or the oil/emulsion interface, and determining the height of the gas/oil interface or the oil/emulsion interface according to the sinking depth of the liquid level sensor.
The sections to which the gas and oil belong are determined based on the characteristics of the voltage difference between the electrode plates in the upper and lower sections of the gas/oil interface.
The section to which the oil and the emulsion belong is determined based on the characteristics of the voltage difference between the electrode plates in the upper and lower sections of the oil/emulsion interface.
When the liquid level measurement mode is ert measurement mode, the method of determining conductivity distribution information includes:
applying current excitation to different electrode plates in a circulating way, and simultaneously obtaining the inter-electrode plate voltage between the electrode plate subjected to the current excitation and the opposite electrode plate;
if the jump occurs between the electrode plates of the two opposite electrode plates, determining that the liquid level sensor moves to the water/emulsion interface, and respectively determining the height of the water/emulsion interface according to the sinking depth of the liquid level sensor.
And determining the section of the water and the emulsion based on the characteristics of the voltage between the electrode plates in the upper section and the lower section of the water/emulsion interface.
In some embodiments of the application, a method is disclosed for enabling the determination of various fluid media by means of an image, comprising: establishing a multiphase flow media profile for the liquid storage device; constructing a gas/oil dynamic boundary on the multiphase flow medium distribution diagram according to the height determined by the gas/oil interface; constructing an oil/emulsion dynamic boundary on the multiphase flow media distribution map according to the height determined by the oil/emulsion interface; a water/emulsion dynamic boundary is constructed on the multiphase flow media distribution map based on the height determined by the water/emulsion interface.
In some embodiments of the present application, referring to fig. 3 and 4, a method of determining a characteristic of a voltage difference between electrode sheets of an upper and lower section of a water/emulsion interface, a characteristic of an inter-electrode sheet voltage between electrode sheets of an upper and lower section of a gas/oil interface, and a characteristic of an inter-electrode sheet voltage between electrode sheets of an upper and lower section of an oil/emulsion interface is disclosed, the characteristic of the voltage difference between electrode sheets of the upper and lower section of the water/emulsion interface comprising a dielectric constant profile, the characteristic of the inter-electrode sheet voltage between electrode sheets of the upper and lower section of the gas/oil interface comprising a conductivity profile, the characteristic of the inter-electrode sheet voltage between electrode sheets of the upper and lower section of the oil/emulsion interface comprising a conductivity profile;
the method for determining the dielectric constant distribution comprises the following steps:
first, a dielectric constant distributed sensitive field matrix is constructed.
And secondly, constructing a rotation matrix of a sensitive field matrix with dielectric constant distribution according to an LBP algorithm, and calculating the dielectric constant distribution.
The expression of the dielectric constant distribution is: g=s T λ。
Where λ is the normalized capacitance value, S is the normalized sensitive field matrix, and g is the dielectric constant distribution.
And applying voltage to one electrode sheet (excitation electrode), measuring the voltage of the other electrode sheet (measurement electrode), wherein the measurement electrode needs to be kept in a grounding state, and the other electrode sheets except the excitation electrode need to be kept in a virtual grounding state.
The relationship between the capacitance value and the measured voltage value can be represented by the formula
Expressed, where ε (x, y) is the dielectric constant distribution function in the measurement area, V is the potential difference between the excitation electrode and the measurement electrode, φ (x, y) is the potential distribution function in the measurement area, which can be written in another form by the formula, λ=sg, where λ is the normalized capacitance value, S is the sensor normalized sensitivity field matrix, g is the dielectric constant distribution to be solved, which is similar to ert for the conductivity distribution.
The method for determining the conductivity distribution comprises the following steps:
in the first step, a sensitive field matrix of conductivity distribution is constructed.
And secondly, constructing a rotation matrix of a sensitive field matrix of the conductivity distribution according to an LBP algorithm, and calculating the conductivity distribution.
The conductivity distribution is expressed as: g=s T V。
Wherein S is a normalized sensitive field matrix, V is a normalized voltage vector, and g is conductivity distribution.
For the ert mode, for the ert mode of the 8 electrode plates, current excitation is applied to two electrode plates, the voltage between the other two electrode plates is measured, when the sensor gradually moves from water to the emulsion liquid level, the conductivity of the medium changes, and under the condition of fixed current excitation, the voltage between the two electrode plates changes, so that whether the sensor reaches the water emulsion interface can be judged by whether the voltage jumps or not.
In some embodiments of the present application, a method of determining a sensitivity field matrix is disclosed, the sensitivity field matrix being simulated via a comsol simulation software.
The sensitive field matrix can be generally established into a fixed model in the comsol simulation software under the condition that the length, the size, the spacing and the number of the electrode plates are fixed, and the model is used for solving.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application and not for limiting it, and although the present application has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that: the technical scheme of the application can be modified or replaced by the same, and the modified technical scheme cannot deviate from the spirit and scope of the technical scheme of the application.
Claims (9)
1. A dual-purpose liquid level sensor, comprising:
the outer shielding shell is used for shielding external electromagnetic wave interference;
the transverse insulating cylinder is arranged on the inner side of the outer shielding shell, a vacuum airtight gap is reserved between the transverse insulating cylinder and the outer shielding shell, a plurality of sliding grooves are formed in the inner side of the transverse insulating cylinder in a surrounding mode, and embedded grooves are formed in the bottoms of the sliding grooves;
the electrode plates are arranged in the embedded groove;
the sliding isolation plates are arranged in the sliding grooves;
and the plurality of isolation plate switch mechanisms are arranged on the inner side of the transverse insulating cylinder and are used for driving the sliding isolation door to move in the sliding chute.
2. The dual purpose liquid level sensor of claim 1, wherein said isolator plate switch mechanism comprises:
the first arc-shaped guide rod is arranged at one end of the sliding isolation plate, a first arc-shaped sliding pore canal is arranged on the inner wall of the chute at the position corresponding to the first arc-shaped guide rod, and one end of the first arc-shaped guide rod is inserted into the first arc-shaped sliding pore canal;
the first spring is in a compressed state, is sleeved on the side part of the first arc-shaped guide rod, and two ends of the first spring are connected between the sliding isolation plate and the sliding chute;
the switch motor is arranged on the transverse insulating cylinder, a rotating wheel is sleeved on an output shaft of the switch motor, a linkage rope is wound on the side part of the rotating wheel, and the end head of the linkage rope is connected with the end head of the first arc-shaped guide rod.
3. The dual-purpose liquid level sensor of claim 1, wherein the separator switch mechanism is a double spring mechanical switch.
4. The dual purpose liquid level sensor of claim 1, further comprising: the balancing weight is arranged at the side part of the outer shielding shell.
5. A liquid level measuring method of a dual-purpose liquid level sensor, characterized by being applied to the liquid level sensor as claimed in any one of claims 1 to 3, comprising:
acquiring a liquid level measurement mode, driving a separator switch to drive a sliding separator to seal an electrode plate if the liquid level measurement mode is a ect measurement mode, and determining that the separator switch drives the sliding separator to open a discharge electrode plate if the liquid level measurement mode is a ert measurement mode, wherein the ect measurement mode is used for detecting dielectric constant distribution of multiphase flow media, and the ert measurement mode is used for detecting conductivity distribution of the multiphase flow media;
determining the dielectric constant distribution information detected according to the ect measurement mode, determining a gas/oil interface and an oil/emulsion interface according to the dielectric constant distribution information, and determining the heights of the gas/oil interface and the oil/emulsion interface according to the depth of penetration of the liquid level sensor;
and determining the water/emulsion interface according to the conductivity distribution information detected by the ert measurement mode and the height of the water/emulsion interface according to the depth of penetration of the liquid level sensor.
6. The method for measuring the liquid level of a dual-purpose liquid level sensor as claimed in claim 5, further comprising:
when the liquid level measurement mode is ect measurement mode, the method of determining dielectric constant distribution information includes:
sequentially applying preset voltages to different electrode plates in a circulating way, simultaneously acquiring the real-time voltage of the other opposite electrode plate, and calculating to obtain the voltage difference between the two opposite electrode plates;
if the voltage difference between the two opposite electrode plates jumps, determining that the liquid level sensor moves to a gas/oil interface or an oil/emulsion interface, and respectively determining the height of the gas/oil interface or the oil/emulsion interface according to the sinking depth of the liquid level sensor;
determining the section of the gas and the oil based on the characteristics of the voltage difference between the electrode plates in the upper section and the lower section of the gas/oil interface;
determining the section of the oil and the emulsion based on the characteristics of the voltage difference between the electrode plates in the upper section and the lower section of the oil/emulsion interface;
when the liquid level measurement mode is ert measurement mode, the method of determining conductivity distribution information includes:
applying current excitation to different electrode plates in a circulating way, and simultaneously obtaining the inter-electrode plate voltage between the electrode plate subjected to the current excitation and the opposite electrode plate;
if the voltage between the electrode plates of the two opposite electrode plates jumps, determining that the liquid level sensor moves to a water/emulsion interface, and respectively determining the height of the water/emulsion interface according to the sinking depth of the liquid level sensor;
and determining the section of the water and the emulsion based on the characteristics of the voltage between the electrode plates in the upper section and the lower section of the water/emulsion interface.
7. The method for measuring the liquid level of a dual-purpose liquid level sensor as claimed in claim 6, further comprising:
establishing a multiphase flow media profile for the liquid storage device;
constructing a gas/oil dynamic boundary on the multiphase flow medium distribution diagram according to the height determined by the gas/oil interface;
constructing an oil/emulsion dynamic boundary on the multiphase flow media distribution map according to the height determined by the oil/emulsion interface;
a water/emulsion dynamic boundary is constructed on the multiphase flow media distribution map based on the height determined by the water/emulsion interface.
8. The method of measuring a liquid level of a dual-purpose liquid level sensor as claimed in claim 6, wherein the characteristic of the voltage difference between the electrode sheets in the upper and lower sections of the water/emulsion interface includes a dielectric constant distribution, the characteristic of the inter-electrode sheet voltage between the electrode sheets in the upper and lower sections of the gas/oil interface includes a conductivity distribution, and the characteristic of the inter-electrode sheet voltage between the electrode sheets in the upper and lower sections of the oil/emulsion interface includes a conductivity distribution;
the method for determining the dielectric constant distribution comprises the following steps:
constructing a sensitive field matrix with dielectric constant distribution;
constructing a rotation matrix of a sensitive field matrix with dielectric constant distribution according to an LBP algorithm, and calculating the dielectric constant distribution;
the expression of the dielectric constant distribution is: g=s T λ；
Wherein lambda is a normalized capacitance value, S is a normalized sensitive field matrix, and g is dielectric constant distribution;
the method for determining the conductivity distribution comprises the following steps:
constructing a sensitive field matrix of conductivity distribution;
according to an LBP algorithm, constructing a rotation matrix of a sensitive field matrix of conductivity distribution, and calculating the conductivity distribution;
the conductivity distribution is expressed as: g=s T V；
Wherein S is a normalized sensitive field matrix, V is a normalized voltage vector, and g is conductivity distribution.
9. The method for measuring the liquid level of a dual-purpose liquid level sensor as claimed in claim 8, wherein the sensitive field matrix is obtained through simulation by a comsol simulation software.
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