CN104132215A - Acoustic-magnetic-thermal combined paraffin-control and plug-removal method and device for oil pipeline - Google Patents
Acoustic-magnetic-thermal combined paraffin-control and plug-removal method and device for oil pipeline Download PDFInfo
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- CN104132215A CN104132215A CN201410340920.8A CN201410340920A CN104132215A CN 104132215 A CN104132215 A CN 104132215A CN 201410340920 A CN201410340920 A CN 201410340920A CN 104132215 A CN104132215 A CN 104132215A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
- F16L53/30—Heating of pipes or pipe systems
- F16L53/34—Heating of pipes or pipe systems using electric, magnetic or electromagnetic fields, e.g. using induction, dielectric or microwave heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/24—Preventing accumulation of dirt or other matter in the pipes, e.g. by traps, by strainers
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
- H05B2206/02—Induction heating
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Pipeline Systems (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses an acoustic-magnetic-thermal combined paraffin-control and plug-removal method and device for an oil pipeline. According to the method and device, the ultrasonic technology, the electromagnetic induction heating technology and the electromagnetic paraffin-control technology are combined and reinforce one another, and a paraffin-control and plug-removal effect superior to simple superposition can be obtained. The device is composed of an ultrasonic generating module, an electromagnetic induction heating module, a power source module, a remote communication module, a protection and control module, a pressure measuring module, a temperature measuring module, a measuring terminal and an electromagnetic paraffin-control module. By the adoption of the device, precipitation of paraffin is prevented so that scale formation can be avoided and generated paraffin can be removed by means of the high-power ultrasonic cavatition effect and the good paraffin control effect of the alternating magnetic field; the temperature of the oil pipeline is increased by means of the electromagnetic induction heating technology, the temperature of crude oil is kept higher than paraffin precipitation point temperature, and the paraffin precipitation is restrained; meanwhile, the blocking degree of the pipeline can be automatically judged by means of sensors at the head end and tail end of the pipeline, and then corresponding working modes are started. The device is high in universality and operates online completely.
Description
Technical field
The present invention relates to a kind of transport pipe and say the magnetic compound wax control method for removing blockage of heat and device, relate to specifically a kind ofly by ultrasonic technology, electromagnetism anti-wax technique and electromagnetic induction heating technology wax control method for removing blockage and device that organically combine, high efficiency smart, belong to petroleum industry field.
Technical background
In field produces running, the fouling blockage problem of oil transport pipeline is perplexing the normal production of petroleum industry always.Fouling meeting reduces pipeline passing capacity, reduces output, increases energy consumption equipment and generates heat and accelerate that it is aging.Serious until while stopping up oil transport pipeline, just must stop producing and carry out de-plugging operation when fouling, not only consume a large amount of manpower and materials, increase cost, and had a strong impact on the normal production in oil field.How effectively to prevent oil transport pipeline fouling, abolish fast established obstruction, the production in oil field is had very important significance simultaneously.
The material that causes oil pipe blocking is a lot, common paraffin, salt dirt, corrosion dirt and the sedimentation dirt of mainly containing.The most of wax content in crude oil of China is high, and in the actual motion of oil transport pipeline, topmost scale forming matter is paraffin.Wax in crude oil conventionally exists with liquid form under formation condition.In Mining Transport process, along with the decline of surface temperature and pressure, the molten wax ability of crude oil reduces, and paraffin starts crystallization and is attached to transport pipe inwall, and the continuous deposition of paraffin can reduce the diameter that passes through of pipeline, and final formation stopped up.
At present conventional method for removing blockage mainly contains physical method, chemical method and biological method, and physical method is to utilize physical action to put on obstruction it is smashed and is abolished.Mainly comprise high-pressure water shot technology, mechanical means, sound wave method, electric field method, magnetic field wax control etc.Chemical method to be adopted to injecting the special chemical reagent of de-plugging in pipeline and washes away pipeline, dissolves to reach the object of eliminating obstruction.Biological method is to utilize food wax microorganism to form one deck biological protection film at oil transport pipeline wall in reproductive process, makes the easy scale forming matters such as paraffin be difficult for adhering to, thereby reaches the object of wax control.
All there is obvious deficiency in above traditional approach.The strong acid using in chemical method can pollute, and long-time operation meeting corrosion damage pipeline, loses more than gain.Some common physical solution blocking methods need to stop production operation and complicated operation, as high pressure water jet more.And can on-line operation method be also mainly for wax control, when wax deposition, seriously to form the time effect of obstruction very micro-, can not solve tubing plugging troubles.Therefore, need badly and find a kind of method can there is desirable wax control plugging removal effect simultaneously, and can on-line operation do not affect oil well and normally produce.
By the analysis contrast to conventional physical method, the present invention proposes transport pipe and say the magnetic compound wax control method for removing blockage of heat and device, three kinds of effects of sound magnetic heat can supplement enhancing mutually, overcome the single deficiency of doing the used time.The method can effectively prevent paraffin to separate out, and abolishes transport pipe and stop up.This device highly versatile, not only obvious to paraffin action effect, when same, be also applicable to the oil pipe blocking that other material causes.And this device can on-line operation, does not affect oil well and normally works, and can not cause damage to pipe-line equipment.
Summary of the invention
In order effectively to prevent pipeline scale, and rapidly and efficiently remove line clogging, for the deficiency of existing wax control method for removing blockage, the present invention proposes to be applied to the oil field oil pipeline sound magnetic compound wax control method for removing blockage of heat and device, utilize the good wax control effect of high-power ultrasonics cavitation, mechanism, alternating magnetic field to suppress paraffin and separate out fouling, and the wax dirt having produced is abolished; By electromagnetic induction heating technology rising oil pipe temperature, crude oil temperature is held on wax precipitation point temperature, suppress paraffin and separate out; By being installed on temperature and the pressure transducer of pipeline first and last, collect temperature and pressure information, and the information of real-time collecting is analyzed, formulate the rationally economic method of operation; Simultaneously with bluetooth communication module, can be in real time and handheld device carry out communication, and can utilize handheld device to carry out parameter modification and control.
The technical solution adopted in the present invention is as follows:
Transport pipe is said the magnetic compound wax control method for removing blockage of heat and device, it is characterized in that, device is made up of ultrasound generation module (1), electromagnetic induction heating module (2), power module (3), telecommunication module (4), protection and control module (5), pressure measuring module (6), temperature-measuring module (7), measuring terminals (8), electromagnetism wax control module (9), power frequency supply carries out full-bridge rectification through power module (3), after rectification, voltage is directly inputted ultrasound generation module (1), electromagnetic induction heating module (2) and electromagnetism wax control module (9), ultrasound generation module (1) produces ultrasound by inversion and transducing, electromagnetic induction heating module (5) produces midfrequent AC voltage input heating coil by inversion and produces the alternating magnetic field for heating, electromagnetism wax control module (9) produces alternating voltage input electromagnetic induction coil by inversion and produces the alternating magnetic field for wax control, by protection and control module (5) in real time to ultrasound generation module (1) and electromagnetic induction heating module (2), electromagnetism wax control module (9) communicates and controls, protection and control module (5) can detect the frequency of ultrasound occurrence frequency and electromagnetic induction coil heating-up temperature and alternating magnetic field, and carry out real-time guard and control, protection and control module (5) is with blue tooth communication function, can utilize bluetooth to transmit collected information, and can receive outside input signal, this module also can and communicate with the handheld device of bluetooth and specific APP program various running state parameters, can control whole system by handheld device, pressure measuring module (6), temperature-measuring module (7) is installed on the head and end of pipeline simultaneously, temperature that can measuring channel first and last and pressure also can directly transfer to data protection and control module (5), the pressure measuring module (6) that is installed on pipe end with temperature-measuring module (7) by data transfer to measuring terminals (8), again by telecommunication module (4) by communication to protection and control module (5).
Described transport pipe is said the compound wax control method for removing blockage of magnetic heat and device, is that its wax control wax removal effect is better than the simple superposition of three kinds of effects by the use that is coupled of pyromagnetic sound three kinds of physics wax control de-plugging modes; This device can be identified pipeline scale stopping state automatically by pressure and temperature transducer, thereby adopts the method for operation of economical rationality, as two kinds of stacks or independent a kind of mode are worked.
Described transport pipe is said the magnetic compound wax control method for removing blockage of heat and device, ultrasound generation module (1) adopts piezoelectricity mode to produce, can be according to different operating modes require automatic or manual control to realize Frequency to send ultrasound, contain frequency collection function simultaneously, occurrence frequency can be fed back, and carry out in real time FREQUENCY CONTROL, thereby ensure to continue to send the ultrasound of required frequency.
Described transport pipe is said the magnetic compound wax control method for removing blockage of heat and device, and electromagnetic induction heating module (2), by producing intermediate frequency action of alternating magnetic field in oil transport pipeline, when action of alternating magnetic field is during in oil transport pipeline, produce eddy current, heating oil pipe, raises thereby make to manage interior crude oil temperature.When temperature is higher than wax precipitation point temperature, in crude oil, the crystallization of paraffin is suppressed.This mode, without heating equipment is deep in oil pipe, also can as electric-heating unblocking, not produce electrochemical corrosion, and heating power is adjustable, on-line operation completely, safety, efficient, reliable.
Described transport pipe is said the magnetic compound wax control method for removing blockage of heat and device, and electromagnetism wax control module (9), by producing the crude oil of action of alternating magnetic field in oil transport pipeline.When action of alternating magnetic field is during in crude oil, the paraffin in crude oil and other easy scale forming matter produce and wave along with the variation in magnetic field, separate out fouling thereby suppress it.The complete on-line operation of this device, does not affect the normal production of oil well.
Described transport pipe is said the magnetic compound wax control method for removing blockage of heat and device; the pressure measuring module (6), temperature-measuring module (7), telecommunication module (4), measuring terminals (8) that are installed on pipeline first and last can be by first pipeline terminal temperature and pressure information real-time Transmission to protection and control module (5), through protection and control module (5) computational analysis comparison.By pressure difference and the temperature difference of comparative analysis pipeline first and last, judge the wax deposition order of severity and clear wax control result, the actuating signal of the clear wax control system of conduct accordingly, control ultrasound generation module (1) by protection and control module (5), electromagnetic induction heating module (2), electromagnetism wax control module (9), make it enter corresponding mode of operation, different mode of operations comprise: ul-trasonic irradiation separately, electromagnetic induction effect separately, electromagnetism wax control effect separately, three kinds of mode actings in conjunction or between two effect, and control different heating powers, ultrasound sends power and frequency and electromagnetism wax control magnetic intensity.
Described transport pipe is said the magnetic compound wax control method for removing blockage of heat and device; protection and control module (5) is the core control section of this device; wherein contain bluetooth module; can carry out communication by bluetooth and with the handheld device of customization APP; pipeline scale stopping state can be uploaded to mobile phone in real time; also can control and parameter configuration by mobile phone, for example, set different working modes, ultrasound generation power, electromagnetic induction heating temperature etc.
Described transport pipe is said the magnetic compound wax control method for removing blockage of heat and device; measuring terminals (8); by being arranged on the pressure measuring module (6) of pipe end, the data that temperature-measuring module (7) gathers gather, and send data to the protection and control module (5) of pipeline head end by telecommunication module (4).
Compared with prior art, the invention has the beneficial effects as follows:
By traditional and novel organic combination of wax removal technology, i.e. ultrasonic technology, electromagnetic induction heating technology and electromagnetism anti-wax technique.Ultrasound adopts piezoelectricity type to occur, and compared with occurring, has advantages of that power-frequency is adjustable, action effect is obvious, easy to maintenance rapidly with traditional mechanical type.These three kinds of technology are coupled, have not only made up the deficiency while adopting single mode, can realize wax control wax removal and be integrated, simultaneously can on-line operation, can not affect the normal production of oil well.This device highly versatile, be not only applicable to paraffin also has stronger removal effect to other main scale forming matter simultaneously.
Whole wax control de-plugging process is controlled voluntarily by software completely; by the comparative analysis to pipeline first and last pressure and temperature; protection and control module (5) can accurately be formulated corresponding mode of operation; fouling and the blockage problem of solution pipeline that can high-efficiency and economic, and highly versatile, on-line operation, intelligence are controlled.
Brief description of the drawings
Fig. 1 is the composition structure principle chart that transport pipe is said the compound wax control plug removal equipment of magnetic heat.
Fig. 2 is that pipe end is measured communication part composition structure principle chart.
In figure, 1-ultrasound generation module, 2-electromagnetic induction heating module, 3-power module, 4-telecommunication module, 5-protection and control module, 6-pressure measuring module, 7-temperature-measuring module, 8-measuring terminals, 9-electromagnetism wax control module.
Embodiment
Below in conjunction with accompanying drawing 1 and accompanying drawing 2, the invention will be further described:
Power module (3) carries out civil power after rectification step-down, for whole system power supply, as ultrasound generation module (1), electromagnetic induction heating module (2), protection and control module (5) etc.
Ultrasound generation module (1) utilizes IGBT to produce ultrasonic electrical signal, controls the frequency of ultrasonic electrical signal by protection and control module (5), and electrical signal is connected with transducer by impedance matching circuit, thereby sends ultrasound.
Electromagnetic induction heating module (2) utilizes IGBT to produce midfrequent AC voltage equally, and by protection and control module (5) control frequency, medium frequency alternating current stream, by electromagnetic induction coil, produces alternating magnetic field.
Electromagnetism wax control module (9) utilizes IGBT to produce midfrequent AC voltage, and by protection and control module (5) control frequency, medium frequency alternating current stream, by electromagnetic induction coil, produces alternating magnetic field.
Pressure measuring module (6), the temperature-measuring module (7) of pipeline head end can directly transfer to the pressure recording, temperature information protection and control module protection and control module (5), analyze for it.
At pipe end; measuring terminals (8) transfers to protection and control module (5) by data measured to pressure measuring module (6) and temperature-measuring module (7) by telecommunication module (4), and the latter is by analyzing than rear definite corresponding mode of operation with temperature information with the pressure of pipeline head end.
Protection and control module (5) is the core of whole system; not only can receive the data of peripheral sensor; formulate corresponding mode of operation, and control ultrasound generation module (1), frequency and the power of electromagnetic induction heating in medium frequency module (2) and electromagnetism wax control module (9).This module also has blue tooth communication function simultaneously, can be real-time carry out communication with handheld device, transmission Operational Limits and reception control signal.
The foregoing is only better embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. transport pipe is said the magnetic compound wax control method for removing blockage of heat and device, it is characterized in that, device is made up of ultrasound generation module (1), electromagnetic induction heating module (2), power module (3), telecommunication module (4), protection and control module (5), pressure measuring module (6), temperature-measuring module (7), measuring terminals (8), electromagnetism wax control module (9), power frequency supply carries out full-bridge rectification through power module (3), after rectification, voltage is directly inputted ultrasound generation module (1), electromagnetic induction heating module (2) and electromagnetism wax control module (9), ultrasound generation module (1) produces ultrasound by inversion and transducing, electromagnetic induction heating module (5) produces midfrequent AC voltage input electromagnetic induction coil by inversion and produces the alternating magnetic field for heating, electromagnetism wax control module (9) produces alternating voltage input electromagnetic induction coil by inversion and produces the alternating magnetic field for wax control, by protection and control module (5) in real time to ultrasound generation module (1), electromagnetic induction heating module (2), electromagnetism wax control module (9) communicates and controls, protection and control module (5) can detect ultrasound occurrence frequency, the heating-up temperature of electromagnetic induction coil and the frequency of alternating magnetic field, and carry out real-time guard and control, protection and control module (5) is with bluetooth communicate via communication function, collected information can be transmitted, and receive outside input signal, this module also can and communicate transmission with the handheld device of bluetooth and specific APP program by various running state parameters, and can control whole system by handheld device, pressure measuring module (6), temperature-measuring module (7) is installed on the head and end of pipeline, temperature that can measuring channel first and last and pressure also can directly transfer to data protection and control module (5), the pressure measuring module (6) that is installed on pipe end with temperature-measuring module (7) by data transfer to measuring terminals (8), again by telecommunication module (4) by communication to protection and control module (5).
2. transport pipe according to claim 1 is said the compound wax control method for removing blockage of magnetic heat and device, it is characterized in that, this kind of method is by uses that be coupled of pyromagnetic sound three kinds of physics wax control de-plugging modes, forms the wax control wax removal effect that superposes; Also can two kinds stack or adopt independent a kind of mode to use.
3. transport pipe according to claim 1 is said the magnetic compound wax control method for removing blockage of heat and device, it is characterized in that, ultrasound generation module (1) adopts piezoelectricity mode to produce, can be according to different operating modes require automatic or manual control to realize Frequency to send ultrasound, there is frequency collection function simultaneously, occurrence frequency can be fed back.
4. transport pipe according to claim 1 is said the magnetic compound wax control method for removing blockage of heat and device, it is characterized in that electromagnetic induction heating module (2), can produce intermediate frequency alternating magnetic field, in oil transport pipeline, produce eddy current by this magnetic field, make pipeline heating, thus the crude oil in heating pipe.
5. transport pipe according to claim 1 is said the compound wax control method for removing blockage of magnetic heat and device, it is characterized in that, electromagnetism wax control module (9), can produce alternating magnetic field, and this magnetic fields is in ducted crude oil, thereby reaches the object of electromagnetism wax control.
6. transport pipe according to claim 1 is said the magnetic compound wax control method for removing blockage of heat and device, it is characterized in that, be installed on the pressure measuring module (6) of pipeline first and last, temperature-measuring module (7), telecommunication module (4), measuring terminals (8) can be by first pipeline terminal temperature and pressure information real-time Transmission to protection and control module (5), after its computational analysis relatively, judge the wax deposition order of severity and clear wax control result, the actuating signal of the clear wax control system of conduct accordingly, control ultrasound generation module (1) by protection and control module (5), electromagnetic induction heating module (2), electromagnetism wax control module (9), make it enter corresponding mode of operation.
7. transport pipe according to claim 1 is said the magnetic compound wax control method for removing blockage of heat and device; it is characterized in that; protection and control module (5) can be carried out communication by bluetooth and the handheld device that customization APP is housed, and can carry out parameter configuration, control and data monitoring by mobile phone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410340920.8A CN104132215B (en) | 2014-07-17 | 2014-07-17 | Acoustic-magnetic-thermal combined paraffin-control and plug-removal method and device for oil pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410340920.8A CN104132215B (en) | 2014-07-17 | 2014-07-17 | Acoustic-magnetic-thermal combined paraffin-control and plug-removal method and device for oil pipeline |
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| Publication Number | Publication Date |
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| CN104132215A true CN104132215A (en) | 2014-11-05 |
| CN104132215B CN104132215B (en) | 2017-02-01 |
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| CN201410340920.8A Expired - Fee Related CN104132215B (en) | 2014-07-17 | 2014-07-17 | Acoustic-magnetic-thermal combined paraffin-control and plug-removal method and device for oil pipeline |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104863546A (en) * | 2015-05-29 | 2015-08-26 | 山东鑫茂奥奈特复合固体润滑工程技术有限公司 | Permanent magnet ultrasonic paraffin control device |
| CN104965545A (en) * | 2015-07-06 | 2015-10-07 | 胡延军 | Electric heating constant-temperature pipeline and temperature control method |
| CN105423130A (en) * | 2015-11-20 | 2016-03-23 | 哈尔滨工业大学 | Ultrasonic-electromagnetic combined action based viscosity-reducing and paraffin-control device for crude oil and viscosity-reducing and paraffin-control method of device |
| CN106567690A (en) * | 2016-10-31 | 2017-04-19 | 北京首光艾达科技有限公司 | Oil field wax removing equipment and frequency control method thereof |
| CN108317396A (en) * | 2018-03-26 | 2018-07-24 | 北京石油化工学院 | Underwater crude oil pipeline paraffin blockage electrical heating releases simulator |
| WO2019171365A1 (en) * | 2018-03-07 | 2019-09-12 | Pt. Audemars Indonesia | Method for smooth flowing heavy oil in a distributing pipe using an electric source |
| CN111101896A (en) * | 2019-02-19 | 2020-05-05 | 大庆市富隆达石油工程机械设备有限公司 | Anti-paraffin precipitation device |
| CN111601410A (en) * | 2020-05-26 | 2020-08-28 | 盘锦志达实业有限公司 | Electromagnetic heating device |
| CN112878990A (en) * | 2021-02-04 | 2021-06-01 | 东北大学 | Real-time monitoring method and system for oil well electric heating dewaxing process based on electric power |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108591831A (en) * | 2018-04-10 | 2018-09-28 | 中国石油大学(北京) | A method of regulating and controlling waxy crude oil yield stress using alternating magnetic field |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104863546A (en) * | 2015-05-29 | 2015-08-26 | 山东鑫茂奥奈特复合固体润滑工程技术有限公司 | Permanent magnet ultrasonic paraffin control device |
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| CN105423130A (en) * | 2015-11-20 | 2016-03-23 | 哈尔滨工业大学 | Ultrasonic-electromagnetic combined action based viscosity-reducing and paraffin-control device for crude oil and viscosity-reducing and paraffin-control method of device |
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| CN108317396A (en) * | 2018-03-26 | 2018-07-24 | 北京石油化工学院 | Underwater crude oil pipeline paraffin blockage electrical heating releases simulator |
| CN108317396B (en) * | 2018-03-26 | 2023-08-15 | 北京石油化工学院 | Electric heating relieving simulator for wax blockage of underwater crude oil pipeline |
| CN111101896A (en) * | 2019-02-19 | 2020-05-05 | 大庆市富隆达石油工程机械设备有限公司 | Anti-paraffin precipitation device |
| CN111601410A (en) * | 2020-05-26 | 2020-08-28 | 盘锦志达实业有限公司 | Electromagnetic heating device |
| CN112878990A (en) * | 2021-02-04 | 2021-06-01 | 东北大学 | Real-time monitoring method and system for oil well electric heating dewaxing process based on electric power |
| CN112878990B (en) * | 2021-02-04 | 2023-06-13 | 东北大学 | Real-time monitoring method and system for electric heating paraffin removal process of oil well based on electric power |
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