CN113984793B - Oil-covering and wax-depositing prevention crude oil water content online detection device and oil-covering and wax-depositing prevention method - Google Patents
Oil-covering and wax-depositing prevention crude oil water content online detection device and oil-covering and wax-depositing prevention method Download PDFInfo
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Abstract
The invention relates to an oil and wax coating prevention crude oil water content online detection device and an oil and wax coating prevention method, wherein the online detection device comprises a probe, a gauge outfit and a gauge outfit connecting piece, the gauge outfit connecting piece is connected with the gauge outfit and the probe and is sealed, the probe is arranged on a pipeline, an upper microwave detection line and a lower microwave detection line are arranged on a probe main body in the pipeline and are respectively connected with two sets of microwave detection units of a high-frequency circuit board, and each microwave detection unit comprises a microwave signal generator and a phase comparator; a heating device is arranged between an upper microwave detection line and a lower microwave detection line on the probe main body, an upper temperature sensor is arranged above the upper microwave detection line, and a lower temperature sensor is arranged below the lower microwave detection line; the probe body is also provided with an oil temperature sensor, and the oil temperature sensor, the heating device, the upper layer temperature sensor and the lower layer temperature sensor are all connected to the main circuit board; the method for preventing oil and wax from being covered and accumulated is carried out through the circulation of detection, prevention, detection and removal, and the purposes of preventing oil and wax from being covered and reducing the power consumption as much as possible are achieved.
Description
Technical Field
The invention belongs to the field of online detection, and particularly relates to an oil-covering and wax-depositing prevention online detection device for the water content of crude oil and an oil-covering and wax-depositing prevention method.
Background
The online detection of the water content of the crude oil is a worldwide problem, and is very difficult to detect online particularly for thick oil or crude oil with high wax content. In many methods adopted in oil fields at present, such as a resistivity method, a capacitance method, a radio frequency attenuation method and a microwave method, probes of the sensors are easily covered by thick oil or wax deposition, so that measurement errors are increased and even the sensors fail.
The thick oil and wax deposition not only have an influence on an online instrument, but also have a long-term influence on pipeline transportation, and particularly in winter, the oil field has to adopt the operations of viscosity reduction and wax removal. The measures adopted by the general oil field are as follows: hot washing, hot water mixing, pipeline heating and the like. After the measures are taken, oil covering and wax deposition in the crude oil pipeline can be removed, but the oil covering and the wax deposition can be caused after the measures are finished for a long time.
In addition, some manufacturers adopt a mode that a mechanical device erases a probe regularly for a sensor which is easy to be coated with oil and accumulated wax, but the mechanical structure is complex, mechanical faults are easy to occur, the effect is not obvious, and explosion-proof hidden dangers exist.
Therefore, the following problems exist in the online detection of the water content of the crude oil: (1) how to effectively detect and judge whether the probe is coated with oil or deposited with wax; at present, the manual analysis and judgment can be generally carried out only through other parameters such as pressure and the like, and an instrument or other equipment is detached for verification; (2) how to prevent the probe from being covered with oil and accumulated with wax and prolong the period of covering with oil and accumulated with wax; at present, the pipeline is generally heated from the outside, the power is high, the heat conduction efficiency is low, the outside of the pipeline is very hot, and the temperature in the pipeline does not change too much; (3) the method does not depend on mechanical wiping, and how to effectively remove the oil coating and wax deposition of the probe; at present, only a method of regular hot washing is used, the efficiency is low, the cost is high, the hot washing can be carried out only once in a month or longer, and the oil-covering and wax-accumulating can be full in hours or days.
Disclosure of Invention
The invention aims to provide an oil-covering and wax-depositing prevention crude oil water content online detection device and an oil-covering and wax-depositing prevention method, which prevent oil-covering and wax-depositing and prolong the oil-covering and wax-depositing period through multi-point temperature detection and temperature difference PWM control; through the analysis of phase change, whether serious oil-coated wax deposition occurs is judged, full-power heating is adopted, and the oil-coated wax deposition is melted and washed away due to the fact that local high temperature occurs near a probe, particularly a microwave detection line; thereby having good effect of preventing oil and wax from being covered.
In order to achieve the purpose, the invention adopts the technical scheme that: the oil-coating and wax-deposition-preventing crude oil moisture content online detection device comprises a probe, a gauge head and a gauge head connecting piece, wherein the gauge head connecting piece is connected with the gauge head and the probe and is sealed; the probe body is also provided with a heating device positioned between an upper microwave detection line and a lower microwave detection line, an upper layer temperature sensor is arranged above the upper layer microwave detection line, and a lower layer temperature sensor is arranged below the lower layer microwave detection line; the probe main body is also provided with an oil temperature sensor, the heating device, the upper layer temperature sensor and the lower layer temperature sensor are all connected onto the main circuit board, the main circuit board outputs PWM signals according to temperature signals and drives the heating device through a field effect tube, two paths of phase shift signals sent by the high-frequency circuit board are demodulated to obtain corresponding phase shift values, and the main circuit board is in real-time communication with the gauge outfit circuit board.
The upper and lower microwave detection lines are respectively arranged in the corresponding ceramic sealing elements.
And the upper microwave detection line and the lower microwave detection line are respectively provided with an oleophobic and hydrophobic coating.
The heating device is a ceramic heating plate, and the power of the heating device is 20-25W.
And the upper-layer temperature sensor and the lower-layer temperature sensor are respectively installed in corresponding temperature sensor fixing grooves and are filled with heat-conducting silica gel for fixing.
The oil temperature sensor is fixed in the oil temperature sensor fixing hole through an oil temperature sensor sealing sleeve, and the oil temperature sensor sealing sleeve is made of heat insulation materials.
The main circuit board and the high-frequency circuit board are both arranged in the probe inner cavity of the probe main body.
The method is used for the online detection device and comprises preventive measures and removing measures:
(1) the preventive measures are as follows: when the oil temperature in the pipeline is lower than the freezing point of crude oil, PWM constant temperature difference control is carried out by the main circuit board, PWM signals are output, and the ceramic heating sheet is driven by the field effect tube to realize heating power adjustment, so that the average value of the upper layer temperature sensor and the lower layer temperature sensor is higher than the oil temperature to keep the crude oil in the pipeline to flow;
(2) removing measures: when the preventive measures are not obvious and the oil temperature in the pipeline is still below the freezing point of crude oil, whether the phenomenon of oil coating and wax deposition occurs on the probe is judged through the phase change of the microwave detection line, when the phenomenon of oil coating and wax deposition does not occur on the probe, the phase shift change range occurring on the microwave detection line is recorded as delta 1 by the main circuit board in the up-down stroke of the pumping unit, the phase shift change range occurring on the microwave detection line is recorded as delta 2 by the main circuit board in the up-down stroke of the pumping unit when the probe is in actual work, if the delta 2 is smaller than the delta 1, the phenomenon of oil coating and wax deposition occurs on the probe is indicated, at the moment, the main circuit board outputs a PWM signal and drives the ceramic heating sheet to continuously heat through the field effect tube, and the heating is finished until the delta 2 is equal to the delta 1, and the phenomenon of oil coating and wax deposition disappears.
In the method, if the temperature of the upper layer temperature sensor and/or the lower layer temperature sensor exceeds the set protection temperature, the heating of the ceramic heating plate is finished to ensure the safety of the system.
The invention has the beneficial effects that: according to the invention, the possibility of oil coating and wax deposition of the probe is judged through multipoint temperature detection, and on the premise of the possibility of oil coating and wax deposition, the temperature on a microwave transmission line and the nearby temperature are slightly higher than the crude oil temperature and the pipeline temperature through PWM temperature difference control, so that thick oil is not easy to gather or deposit wax on the transmission line, and the time of oil coating and wax deposition is prolonged as much as possible; through the detection of the phase change on the microwave detection line, whether the oil-coated wax deposit appears on the probe or not is judged, and whether the measure of removing the oil-coated wax deposit is achieved or not is judged; after measures for removing the oil-coated wax deposit are taken, the temperature near the microwave transmission line exceeds the freezing point of the thick oil and the wax deposit through full-power local heating until the melted oil-coated wax deposit is washed away; by the process of detection → prevention → detection → removal circulation, the purposes of preventing oil and wax coating and reducing power consumption as much as possible are achieved.
Drawings
FIG. 1 is a structural side view of the device for detecting the water content of crude oil on line, which is used for preventing oil deposition and wax deposition.
FIG. 2 is a structural front view of the device for detecting the water content of crude oil on line for preventing oil deposition and wax deposition.
FIG. 3 is an installation schematic diagram of the oil deposit wax-covering-prevention crude oil water content online detection device and a pipeline.
Fig. 4 is a schematic block diagram of a high frequency circuit board according to the present invention.
Fig. 5 is a schematic block diagram of a main circuit board in the present invention.
FIG. 6 is a graph showing the phase shift of the microwave detection line without the wax deposit on the probe body.
FIG. 7 is a graph of the phase shift of the microwave detection line when the coated wax to be removed exists on the probe body of the present invention.
Fig. 8 is a block diagram of a differential temperature control system of the present invention.
The labels in the figure are: 1. a probe body; 2. a probe lumen; 3. an O-shaped ring sealing groove; 4. mounting a flange on the probe; 5. a gauge head connecting member; 6. installing threads; 7. a probe gauge outfit connecting wire; 8. an oil temperature sensor connecting line; 9. an oil temperature sensor sealing sleeve; 10. an oil temperature sensor; 11. an upper temperature sensor fixing groove; 12. an upper layer temperature sensor; 13. upper microwave detection line; 14. an upper ceramic seal member; 15. a ceramic heating plate fixing groove; 16. a ceramic heating plate; 17. a lower microwave detection line; 18. a lower layer ceramic seal; 19. a lower temperature sensor fixing groove; 20. a lower layer temperature sensor; 21. a high-frequency circuit board; 22. a signal connection line; 23. a main circuit board; 24. a gauge head; 25. installing a pipeline; 26. an oil pipeline; 27. and (4) a channel in the pipeline.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, but the invention is not limited thereto.
Example 1: referring to the attached drawings 1 and 2, the device for detecting the water content of crude oil on line for preventing oil and wax from being covered mainly comprises three parts, namely a probe, a gauge head 24 and a gauge head connecting piece 5. The gauge head connecting piece 5 is used for connecting a gauge head 24 and the probe and sealing, the upper part of the gauge head connecting piece 5 is provided with a mounting thread 6 so as to be connected with the gauge head thread, and the probe gauge head connecting wire 7 penetrates through the middle of the gauge head connecting piece 5 and is connected with the main circuit board 23. The probe comprises a probe body 1 and a probe mounting flange 4, wherein the probe mounting flange 4 is connected with a pipeline mounting flange 25 of an oil pipeline 26 and is sealed through an O-shaped sealing ring, as shown in figure 3; the O-shaped sealing ring is embedded in an O-shaped sealing ring groove 3 which is arranged on the probe main body 1 and close to the probe mounting flange 4. Two sets of microwave detection systems are arranged on the probe main body 1, each set of microwave detection system is provided with a microwave detection line, and two microwave detection lines in the two sets of microwave detection systems are arranged up and down and are divided into an upper microwave detection line 13 and a lower microwave detection line 17. The microwave detection line is made of brass, and the surface of the microwave detection line is sprayed with polytetrafluoroethylene oleophobic and hydrophobic material after sand blasting. The microwave detection line imbeds ceramic seal spare, and ceramic seal spare is very good heat-conducting body to play the effect of sealed microwave detection line and probe main part 1, the ceramic seal spare inlays and establishes in the side of probe main part 1. The microwave detection line is soldered to the high-frequency circuit board 21 after passing through the ceramic seal member and the probe body 1. The probe is mounted in an oil pipeline 26, and crude oil and associated gas flowing through the pipeline are contacted with the microwave detection line. A ceramic heater chip fixing groove 15 is formed between an upper ceramic sealing member 14 and a lower ceramic sealing member 18 on the side of the probe body 1 to mount a ceramic heater chip 16, the ceramic heater chip 16 has a power of 20-25W, and the ceramic heater chip 16 is connected to a main circuit board 23. An upper layer temperature sensor fixing groove 11 is formed above the upper layer ceramic sealing element 14, an upper layer temperature sensor 12 is fixed in the groove, and heat conduction silica gel is filled in the groove. A lower-layer temperature sensor fixing groove 19 is formed below the lower-layer ceramic sealing element 18, a lower-layer temperature sensor 20 is fixed in the groove, and heat-conducting silica gel is filled in the groove. Both the upper and lower layer temperature sensors are connected to the main circuit board 23 by signal connection lines. The probe body 1 is further provided with an oil temperature sensor fixing hole, an oil temperature sensor 10 is fixed and sealed in the oil temperature sensor fixing hole through an oil temperature sensor sealing sleeve 9, and the oil temperature sensor 10 is connected with the main circuit board 23 through an oil temperature sensor connecting wire 8. The oil temperature sensor sealing sleeve 9 is made of a PEEK material with good heat insulation performance, so that the temperature of the ceramic heating sheet 16 is prevented from being transmitted to the oil temperature sensor 10, and the oil temperature is measured more accurately.
The probe cavity 2 of the probe body 1 is provided with the main circuit board 23 and the high-frequency circuit board 21. In order to realize the connection with the two microwave detection lines, two sets of independent microwave detection units are arranged on the high-frequency circuit board 21, and the microwave detection units and the connected microwave detection lines form the microwave detection system. The microwave detection unit comprises a microwave signal generator and a phase comparator, wherein the microwave signal generated by the microwave signal generator is output to the input end of the connected microwave detection line and then returns to the high-frequency circuit board 21 from the return end of the microwave detection line. The phase comparator obtains a displacement signal generated on the microwave detection line by phase-comparing a signal output to the microwave detection line with a signal returned from the microwave detection line. The microwave detection lines are divided into an upper microwave detection line and a lower microwave detection line, so that the obtained displacement signals are corresponding upper displacement signals and lower displacement signals. The high-frequency circuit board 21 is connected with the main circuit board 23 through a signal connection line 22, and the obtained upper layer displacement signal and the lower layer displacement signal are transmitted to a microcontroller of the main circuit board 23 for demodulation processing. Fig. 4 is a schematic circuit diagram of a high frequency circuit board.
When the outside of the microwave detection line contacts different substances, different degrees of phase shift are generated. The magnitude of the phase shift is related to the dielectric constant of the contact substance, and since the dielectric constant of associated gas is 1, the dielectric constant of pure oil is 2.2, and the dielectric constant of water is 80, the substance contacting the microwave detection line can be distinguished by the phase shift detection. Therefore, the microcontroller of the main circuit board 23 simultaneously demodulates the two phase-shifted signals sent from the high-frequency circuit board 21 to obtain the corresponding phase-shifted values. The microcontroller of the main circuit board 23 communicates with the gauge head circuit board in real time through the probe gauge head connecting wire 7, and uploads data to the gauge head circuit board for display and output. The microcontroller of the main circuit board 23 can also output PWM signals according to temperature signals of the three temperature sensors and drive the ceramic heating plate through the field effect transistor, so that the heating power adjustment of 0-100% is realized. Fig. 5 is a schematic block diagram of the main circuit board.
The freezing point is a physical property of crude oil, which is easily frozen when the temperature is below the freezing point. In addition, the freezing point of some crude oil with high wax content also exists, and the oil covering and wax accumulation can be regarded as the same phenomenon. The freezing point is related to oil products and wax content, and the crude oil with low freezing point is called thin oil and has low viscosity, so that the crude oil is not easy to adhere to a probe. The crude oil with high freezing point is called thick oil, has high viscosity and is easy to adhere to the probe. This freezing point temperature is generally 30 to 40 ℃. Thus, many oil fields have crude oil in a thin oil state in summer and in a thick oil state in winter.
In addition to the temperature effect on wax deposition, the flow rate is also one of the factors, and the slow flow rate is easy to deposit wax. Therefore, the probe of the detection device is arranged in the oil pipeline to block the pipeline to a certain degree, so that the flow velocity of crude oil at the position of the probe is improved, the microwave detection line is arranged along the flow velocity direction during installation, the microwave detection line can be washed by utilizing the flowing shearing force of the crude oil, and the probability of oil coating and wax deposition can be reduced by adding the oleophobic and hydrophobic coating on the microwave detection line.
In the structure of the on-line detection device, the main circuit board 23 receives temperature signals from three temperature sensors in real time, which are the crude oil temperature in the pipeline, the upper layer temperature of the probe and the lower layer temperature of the probe respectively. Wherein, the oil temperature sensor 10 is sealed with the metal shell of the probe by a non-heat-conducting heat-insulating material, so that the temperature of the oil temperature sensor is not influenced by the heating of the ceramic heating plate 16 and is closer to the temperature in the actual pipe. The upper temperature sensor 12 is fixed above the upper microwave detection line 13, the lower temperature sensor 20 is fixed below the lower microwave detection line 17, and the ceramic heating sheet 16 is in the middle of the upper and lower microwave detection lines. When the ceramic heating plate 16 is heated, the temperature spreads to the surroundings. Since the ceramic sealing member is also a good heat conductor, the temperature generated by the ceramic heating sheet 16 can be diffused to the microwave detection lines of the upper and lower layers, and the temperature detected by the upper layer temperature sensor 12 is relatively close to the temperature detected by the upper layer microwave detection line 13. The temperature detected by the lower layer temperature sensor 20 is also close to the temperature of the lower layer microwave detection line 17.
Example 2: when the online detection device is used for detecting the water content of crude oil in a pipeline, the method for preventing oil and wax from being covered on the probe comprises preventive measures and removal measures, and is carried out according to the circulation of detection, prevention, detection and removal, so that the purposes of preventing oil and wax from being covered and reducing power consumption as much as possible are achieved.
(1) Preventive measures, when the main circuit board 23 detects that the temperature of the oil in the pipe exceeds the solidification point of the crude oil, no removal measures may be taken. When the oil temperature is lower than the freezing point, PWM constant temperature difference control is performed according To the system diagram of fig. 7 To drive the ceramic heating plate 16 To heat, so that the average value Ta of the temperatures of the upper and lower layers of the probe is kept higher than the oil temperature To, and the higher temperature difference can be set, which is generally 5 ℃. Therefore, the temperature on the microwave detection line is always higher than the oil temperature, the crude oil flow is always kept in the tube, the crude oil is not easy to gather on the probe, the time period of oil covering and wax deposition is prolonged, and the prevention effect is achieved. As can be seen from fig. 8, the flow rate and the water content of the crude oil are also factors that affect the oil temperature To and the average temperature Ta of the upper and lower layers. The automatic adjustment of the temperature difference is realized through the control of the microcontroller on the main circuit board 23, if the water content of the flow speed is large, the quantity of heat taken away is large, the temperature difference is small, the duty ratio of PWM output is improved by the microcontroller, the heating power of the ceramic heating piece is improved, and the temperature difference is continuously kept within a certain control range.
(2) And the removal measures are adopted, and when the effect of the preventive measures is not obvious and the oil temperature in the pipeline is still below the freezing point of the crude oil, whether the phenomenon of oil coating and wax deposition on the probe occurs or not is judged through the phase change of the microwave detection line.
Normally, the water content of the crude oil is periodically changed, and the period of the change is related to the stroke frequency of the pumping unit. Since crude oil generally contains associated gas, the gas also periodically affects the water content. For example, when the pumping unit is in the upper stroke and pumps oil to the ground, the liquid flow is large, and the water content flowing through the probe is high. When the pumping unit is in the lower stroke, the liquid flow is reduced, and gas easily passes through the probe, so that the water content of the gas flowing through the probe is reduced. The higher the moisture content near the probe, the greater the phase shift that occurs on the microwave detection line. This variation can be seen in figure 6.
Crude oil is adhered to the probe, the water content is not high, and the accumulated wax is a substance with low water content. If the probe has a certain degree of oil-coated wax deposition, a certain amount of low-water-content crude oil is fixedly remained on the microwave detection line, so that the phase shift range on the microwave detection line is reduced, as shown in fig. 7.
The main circuit board 23 can detect the phase shift change of the upper and lower microwave detection lines in real time, when the oil and wax covering does not occur on the probe, the phase shift change range occurring on the microwave detection line is recorded as delta 1 by the main circuit board during the up-down stroke of the pumping unit, the phase shift change range occurring on the microwave detection line is recorded as delta 2 by the main circuit board during the up-down stroke of the pumping unit when the probe is in actual operation, if the delta 2 is smaller than the delta 1, the oil and wax covering occurs on the probe, at the moment, a removal measure is adopted, the main circuit board outputs a PWM signal and drives a ceramic heating sheet to continuously heat at full power through a field effect tube, until the delta 2 is equal to the delta 1, the oil and wax covering melts and is washed away, and heating is finished.
For safety, if the temperature of the upper layer temperature sensor 12 and/or the lower layer temperature sensor 20 exceeds the set protection temperature, the heating of the ceramic heating sheet is ended.
The above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and it should be understood by those of ordinary skill in the art that the specific embodiments of the present invention can be modified or substituted with equivalents with reference to the above embodiments, and any modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims to be appended.
Claims (9)
1. Prevent covering crude oil moisture content on-line measuring device of oily wax deposition, including probe, gauge outfit and gauge outfit connecting piece, gauge outfit and probe and sealed are connected to the gauge outfit connecting piece, its characterized in that: the probe comprises a probe main body and a probe connecting flange, the probe main body is installed in the pipeline through the probe connecting flange, an upper microwave detection line and a lower microwave detection line are arranged on the probe main body, the microwave detection lines are in contact with crude oil and associated gas in the pipeline, the microwave detection lines are arranged along the flowing direction of the crude oil, the upper microwave detection line and the lower microwave detection line are both connected with a high-frequency circuit board, the high-frequency circuit board comprises two sets of independent microwave detection units and is respectively in signal connection with the upper microwave detection line and the lower microwave detection line, and the microwave detection units comprise microwave signal generators and phase comparators; the probe body is also provided with a heating device positioned between an upper microwave detection line and a lower microwave detection line, an upper layer temperature sensor is arranged above the upper layer microwave detection line, and a lower layer temperature sensor is arranged below the lower layer microwave detection line; the probe main body is also provided with an oil temperature sensor, the heating device, the upper layer temperature sensor and the lower layer temperature sensor are all connected onto the main circuit board, the main circuit board outputs PWM signals according to temperature signals and drives the heating device through a field effect tube, two paths of phase shift signals sent by the high-frequency circuit board are demodulated to obtain corresponding phase shift values, and the main circuit board is in real-time communication with the gauge outfit circuit board.
2. The device for detecting the water content of crude oil in the oil deposit wax according to claim 1, which is characterized in that: the upper and lower microwave detection lines are respectively arranged in the corresponding ceramic sealing elements.
3. The device for detecting the water content of crude oil in the oil deposit wax according to claim 1, which is characterized in that: and the upper microwave detection line and the lower microwave detection line are respectively provided with an oleophobic and hydrophobic coating.
4. The device for detecting the water content of crude oil in the oil deposit wax according to claim 1, which is characterized in that: the heating device is a ceramic heating plate, and the power of the heating device is 20-25W.
5. The device for detecting the water content of crude oil in the oil-coated and wax-deposited manner according to claim 1, wherein the device comprises: and the upper-layer temperature sensor and the lower-layer temperature sensor are respectively installed in corresponding temperature sensor fixing grooves and are filled with heat-conducting silica gel for fixing.
6. The device for detecting the water content of crude oil in the oil deposit wax according to claim 1, which is characterized in that: the oil temperature sensor is fixed in the oil temperature sensor fixing hole through an oil temperature sensor sealing sleeve, and the oil temperature sensor sealing sleeve is made of heat insulation materials.
7. The device for detecting the water content of crude oil in the oil deposit wax according to claim 1, which is characterized in that: the main circuit board and the high-frequency circuit board are both arranged in the probe inner cavity of the probe main body.
8. The method for preventing oil coverage and wax deposition of the on-line detection device for the water content of the crude oil is characterized by being used for the on-line detection device as claimed in any one of claims 1-7, and comprising the following steps of:
(1) the preventive measures are as follows: when the oil temperature in the pipeline is lower than the freezing point of crude oil, PWM constant temperature difference control is carried out by the main circuit board, PWM signals are output, and the ceramic heating sheet is driven by the field effect tube to realize heating power adjustment, so that the average value of the upper layer temperature sensor and the lower layer temperature sensor is higher than the oil temperature to keep the crude oil in the pipeline to flow;
(2) removing measures: when the preventive measures are not obvious and the oil temperature in the pipeline is still below the freezing point of crude oil, whether the phenomenon of oil coating and wax deposition occurs on the probe is judged through the phase change of the microwave detection line, when the phenomenon of oil coating and wax deposition does not occur on the probe, the phase shift change range occurring on the microwave detection line is recorded as delta 1 by the main circuit board in the up-down stroke of the pumping unit, the phase shift change range occurring on the microwave detection line is recorded as delta 2 by the main circuit board in the up-down stroke of the pumping unit when the probe is in actual work, if the delta 2 is smaller than the delta 1, the phenomenon of oil coating and wax deposition occurs on the probe is indicated, at the moment, the main circuit board outputs a PWM signal and drives the ceramic heating sheet to continuously heat through the field effect tube, and the heating is finished until the delta 2 is equal to the delta 1, and the phenomenon of oil coating and wax deposition disappears.
9. The method for preventing oil and wax deposition of the online detection device of the water content of crude oil according to claim 8, wherein the heating of the ceramic heating plate is finished if the temperature of the upper layer temperature sensor and/or the lower layer temperature sensor exceeds a set protection temperature.
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