CN112525769A - Adjustable external axial magnetic field experimental device and using method thereof - Google Patents
Adjustable external axial magnetic field experimental device and using method thereof Download PDFInfo
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Abstract
The invention discloses an adjustable external axial magnetic field experimental device and a using method thereof. The flow stabilizer comprises a pipeline, a constant-pressure flow stabilizing box, a liquid storage box and a transfer box, and the pipeline is provided with a heat insulation layer; the magnetic field generating device comprises a metal coil and a control circuit; the measuring device comprises a flowmeter and an online viscometer. The metal coil is tightly wound outside the pipeline, the two ends of the coil are provided with fixing clamps which play a role in fixing and adjusting the number of turns of the coil, and meanwhile, the two ends of the coil are provided with wire interfaces which are connected with a control circuit. During liquid stable flow through the pipeline in the constant voltage current stabilizing case, can adjust intraductal axial magnetic field's size and direction based on control circuit, through the change of observing record flowmeter and viscosimeter, can probe the mobility of liquid in the pipeline and the law that axial magnetic field changes.
Description
Technical Field
The invention belongs to the field of electromagnetic control and fluid experiments, and particularly relates to an adjustable external axial magnetic field experimental device and a using method thereof.
Background
The fluid may change its properties to different degrees under the influence of a magnetic field, such as: the magnetic treatment technology commonly used in the petroleum industry enhances the fluidity of crude oil and improves the conveying efficiency, and meanwhile, the magnetic treatment technology also has the advantages of simple operation, low energy consumption, no pollution and the like. However, the domestic magnetic treatment technology for crude oil is immature, most of the technology exists in theoretical research, and no related experimental device is used for determining the influence of specific magnetic field change on the viscosity and the fluidity of the crude oil and the influence of a magnetic field on other fluid properties.
Disclosure of Invention
Aiming at the problem that the influence of specific magnetic field change on fluid properties cannot be determined according to experiments in the background art, the invention provides an adjustable external axial magnetic field experimental device and a using method thereof.
In order to achieve the purpose, the invention adopts the following specific technical scheme:
the invention firstly provides an adjustable external axial magnetic field experimental device, which is characterized in that: comprises a current stabilizer, a magnetic field generating device and a measuring device;
the flow stabilizing device comprises a pipeline, a constant-pressure flow stabilizing box, a liquid storage box and a transfer box; the inlet end of the pipeline is communicated with the constant-pressure and constant-flow box, the outlet end of the pipeline is communicated with the transfer box, and the liquid storage box is positioned below the constant-pressure and constant-flow box, connected with the bottom of the constant-pressure and constant-flow box and used for supplying liquid to the constant-pressure and constant-flow box;
the magnetic field generating device comprises a metal coil, a fixed hoop and a control circuit; the metal coil is wound outside the pipeline, and two ends of the metal coil are connected with the control circuit and used for generating a magnetic field; the fixed hoops are arranged at the two ends of the coil and can move on the pipeline and are used for fixing the coil and adjusting the length of the wound coil;
the measuring device comprises a flowmeter and an online viscometer; the flowmeter and the on-line viscometer are arranged at the outlet end of the pipeline;
a liquid inlet and a liquid outlet are formed at the bottom of the constant-pressure and constant-flow box; an overflow plate, a flow stabilizing plate and a flow stabilizing ball are arranged in the constant-pressure flow stabilizing box; the liquid inlet is arranged between the overflow plate and the flow stabilizing plate; the flow stabilizing plate is arranged between the liquid inlet and the liquid outlet; the flow stabilizing ball is arranged at the liquid inlet to control the liquid to flow in stably; the height of the flow stabilizing plate is lower than that of the overflow plate;
a pump, a liquid inlet pipe and a liquid outlet pipe are arranged in the liquid storage tank; the pump is connected with the liquid inlet through a liquid inlet pipe; the liquid outlet pipe is connected with the liquid outlet.
Furthermore, two sections of metal coils are tightly wound outside the pipeline, the metal coils can be made of copper core enameled wires, a heat insulation layer is arranged between the pipeline and the wound coils, and a valve is arranged at the outlet end of the pipeline.
Furthermore, the optimal inner diameter of the pipeline is 1-3 cm, and the optimal length of the pipeline is 2-3 m; the inner diameter of the metal coil is controlled within the range of 0.4 mm-1.0 mm, the winding length of each section of coil is controlled to be 0.6-1.2 m, and the number of turns is controlled to be 800-3600 turns/m, which is optimal.
Furthermore, the control circuit is composed of a lead, a protection device, a direct current stabilized voltage power supply, a main switch and a lead interface which are connected in series.
Further, the inner diameter of the liquid inlet pipe is smaller than or equal to that of the liquid outlet pipe, and the inner diameter of the liquid inlet pipe is larger than or equal to that of the pipeline.
The invention also provides a using method of the adjustable external axial magnetic field experimental device, which is characterized by comprising the following steps of:
the method comprises the following steps: the experimental device is assembled, the valve is in a closed state, sufficient crude oil for experiments is prepared in the liquid storage tank, the pump is started to enable the crude oil to flow into the constant-pressure constant-flow tank until the crude oil overflows from the overflow plate, the pipeline is filled with the crude oil at the moment, the valve is opened, and when the crude oil stably flows out, the initial crude oil under the condition of no magnetic field at the moment is recorded through the flow meter and the online viscometerFlow rate Q0Temperature T0Viscosity mu0；
Step two: closing the valve to refill the pipeline with crude oil, and selecting the length L1The metal coil is connected with a control circuit, a direct current stabilized voltage supply is turned on, and the output voltage is kept to be an initial value V1The output current is regulated to be I by the unchanged knob, and the smaller output current is set to be I1When the main switch is closed, an axial magnetic field is generated in the pipeline, and the time t of magnetic treatment is recorded1Disconnecting the main switch, opening the valve, and recording the flow Q of crude oil under the magnetic treatment condition1Temperature T1Viscosity mu1；
Step three: after the crude oil magnetically treated in the step is completely discharged, the valve is closed, the crude oil is controlled to refill the pipeline, and the initial value V of the output voltage is kept1The output current knob is adjusted to output different current values I without changingiI ═ 2, 3, 4 …; after the main switch is closed, a new magnetic field is generated in the pipeline, and the time t of magnetic treatment is recordediOpening the valve 3 and recording the flow Q of the crude oil under the condition of the magnetic field at the momentiTemperature TiViscosity mui；
Step four: and selecting metal coils with different lengths to be connected with the control circuit, and repeating the operation contents of the second step and the third step to obtain the metal coils with different lengths and the flow rate, the temperature and the viscosity value of the crude oil under different current values.
The magnetic field generated in the pipeline by the device is an axial magnetic field which is parallel to the flowing direction of the liquid, and the method of winding the electrified solenoid and the additional control circuit is more concise and convenient to change the magnetic field parameters in the pipeline, simultaneously records the change of the viscosity and the flow of the liquid, can better explore the relationship between the liquidity of the liquid and the magnetic field parameters, and simultaneously can provide further theoretical and experimental basis for the research of the flowing modification of the crude oil by the magnetic treatment in the future.
The invention has the advantages and beneficial effects that:
the invention provides an adjustable external axial magnetic field experimental device and a specific scheme of a using method thereof. A flow stabilizer and a magnetic field generating device are utilized to form a uniform axial magnetic field in the pipeline as much as possible; the length of the coil wound outside the pipeline is adjustable, and the purpose of changing the magnetic field parameters in the pipeline is achieved by adjusting the output parameters of the control circuit and the number of turns and the length of the wound coil; the heat insulation layer is additionally arranged outside the pipeline, so that the influence of the heating of the coil on the temperature of the fluid in the pipe can be avoided; different magnetic field environments are set during experiments, and the flowing property of fluid in the pipe and the rule of the magnetic field can be intuitively and conveniently explored by observing the parameter change when the fluid flows under the different magnetic field environments. The elements used in the invention also have the characteristics of low cost, low energy consumption and simple operation, and provide a solid experimental foundation for the mobility research of the axial magnetic field on the crude oil.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention, and the direction of arrows indicates the direction of fluid flow.
Fig. 2a to 2c are schematic diagrams of different connections between the metal coil and the control circuit according to an embodiment of the present invention, and the direction of the arrows indicates the fluid flow direction.
Fig. 3 is a schematic structural view of a flow stabilizer according to an embodiment of the present invention.
FIG. 4 is a schematic view of an on-line viscometer according to an embodiment of the invention.
Fig. 5 is a schematic structural diagram of an output power supply according to an embodiment of the invention.
FIG. 6 is a block diagram of a data processing framework according to an embodiment of the present invention.
The reference numbers in FIG. 1 illustrate: 1 is an online viscometer; 2 is a flowmeter; 3 is a valve; 4 is a metal coil; 5 is a fixed hoop; 6 is a pipeline; 7 is a constant pressure and flow stabilizing box; 7.1 is an overflow plate; 7.2 is a flow stabilizer; 7.3 is a steady flow ball; 7.4 liquid inlet; 7.5 liquid outlet; 8 is a transfer box; 9 is a control circuit; 9.1 is a lead; 9.2 is a circuit protection device; 9.3 is a direct current stabilized voltage power supply; 9.4 is a main switch; 9.5 is a wire interface; 10 is a liquid storage tank; 10.1 is a pump; 10.2 is a liquid inlet pipe; and 10.3 is a liquid outlet pipe.
The designations in FIG. 4 illustrate: 1.1 is a flange; 1.2 stainless steel probe.
The designations in FIG. 5 illustrate: 9.31 is a display screen; 9.32 is a voltage coarse adjustment knob; 9.33 is the voltage fine adjustment knob; 9.34 is a positive terminal; 9.35 is a negative terminal; 9.36 is a power switch; 9.37 is a current coarse adjustment knob; and 9.38 is a current fine adjustment knob.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail and fully with reference to the accompanying drawings in the embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides the following technical scheme:
referring to fig. 1, an adjustable experimental device for an external axial magnetic field comprises a current stabilizer, a magnetic field generating device and a measuring device.
The flow stabilizing device comprises a pipeline 6, a constant-pressure flow stabilizing box 7, a liquid storage box 10 and a transfer box 8; the inlet end of the pipeline 6 is communicated with the constant-pressure and constant-current box 7, the outlet end of the pipeline is communicated with the transfer box 8, and the liquid storage box 10 is located below the constant-pressure and constant-current box 7, connected with the bottom of the constant-pressure and constant-current box 7 and used for supplying liquid to the constant-pressure and constant-current box 7.
The magnetic field generating device comprises a metal coil 4, a fixed hoop 5 and a control circuit 9; the metal coil 4 is wound outside the pipeline 6, and two ends of the metal coil 4 are connected with the control circuit 9 and used for generating a magnetic field; the fixed clamps 5 are arranged at two ends of the coil 4, and the fixed clamps 5 can move on the pipeline 6 and are used for fixing the coil 4 and adjusting the length of the wound coil.
The measuring device comprises a flowmeter 2 and an online viscometer 1; the flowmeter 2 and the online viscometer 1 are arranged at the outlet end of the pipeline 6. The on-line viscometer 1 is an on-line viscometer 1 with a temperature measuring function, can display and record viscosity and temperature, and the flowmeter 2 can display and record real-time flow.
And a steady flow outlet is arranged at the lower left side of the constant pressure and steady flow box 7 and is connected with the pipeline 6. The bottom of the constant-pressure and constant-flow box 7 is provided with a liquid inlet 7.4 and a liquid outlet 7.5; an overflow plate 7.1, a flow stabilizing plate 7.2 and a flow stabilizing ball 7.3 are arranged in the constant-pressure flow stabilizing box 7; the liquid inlet 7.4 is arranged between the overflow plate 7.1 and the flow stabilizing plate 7.2; the flow stabilizing plate 7.2 is arranged between the liquid inlet 7.4 and the liquid outlet 7.5; the flow stabilizing ball 7.3 is arranged at the liquid inlet 7.4 to control the liquid to flow in stably; the height of the flow stabilizing plate 7.2 is lower than that of the overflow plate 7.1.
A pump 10.1, a liquid inlet pipe 10.2 and a liquid outlet pipe 10.3 are arranged in the liquid storage tank 10; the pump 10.1 is connected with the liquid inlet 7.4 through a liquid inlet pipe 10.2; the liquid outlet pipe 10.3 is connected with the liquid outlet 7.5. The inner diameter of the liquid inlet pipe 10.2 is less than or equal to the inner diameter of the liquid outlet pipe 10.3, and the inner diameter of the liquid inlet pipe 10.2 is greater than or equal to the inner diameter of the pipeline 6.
Two sections of metal coils 4 are tightly wound outside the pipeline 6, the metal coils 4 can be made of copper core enameled wires, a heat insulation layer is arranged between the pipeline 6 and the wound coils, and a valve 3 is arranged at the outlet end of the pipeline 6.
The optimal inner diameter of the pipeline 6 is 1-3 cm, and the optimal length of the pipeline is 2-3 m; the inner diameter of the metal coil 4 is controlled within the range of 0.4 mm-1.0 mm, the winding length of each section of coil is controlled to be 0.6-1.2 m, and the number of turns is optimally controlled to be 800-3600 turns/m.
When the metal coil 4 is wound in a single layer, the reference range of the axial magnetic induction intensity generated inside the pipeline 9 is 0-360 mT; when the number of winding layers is n, the axial magnetic induction range that can produce is 0 ~ 360n mT, and n should not be taken too big, and concrete magnetic induction range can be according to the formula: mu is B ═ mu0nI (here. mu. with0Is trueThe air permeability is 1.2566 multiplied by 10 < -6 >, n is the number of turns per unit length, and I is the current), and the specific implementation is referred to the actual situation by combining the actual current and the number of turns.
Enough liquid is ensured in the liquid storage tank 10, a power device pump 10.1 is arranged to continuously send the liquid into the constant-pressure and constant-flow tank 7 through a liquid inlet pipe 10.2, and redundant liquid overflows an overflow plate 7.1 and returns to the liquid storage tank 10 through a liquid outlet pipe 10.3; the height of the liquid level in the constant-pressure and constant-flow box 7 depends on the height of the overflow plate 7.1, and the liquid level is kept at the height in the experimental process. Different magnetic field environments are set during experiments, and the flow property of fluid in the pipe and the rule of the magnetic field can be intuitively and conveniently explored by observing and recording the parameter change of a measuring device when the fluid flows through the pipeline 6 under the different magnetic field environments.
Referring to fig. 2a to 2c, the control circuit can generate an effective magnetic field with a length equal to the winding length of the metal coil 4 connected to the circuit, where the effective magnetic field with the length equal to the sum of the two winding lengths of the metal coil in fig. 2a, the effective magnetic field with the length equal to the left winding length of the metal coil in fig. 2b, and the effective magnetic field with the length equal to the right winding length of the metal coil in fig. 2 c; meanwhile, the effective magnetic field length can be changed by adjusting the number of turns of the coil through the fixed hoop 5.
Referring to fig. 3, the structure of the flow stabilizer 7.2 is schematically illustrated, circular holes are uniformly formed in the flow stabilizer 7.2, and the flow stabilizer 7.2 is used for ensuring that crude oil in the constant-pressure flow stabilizing tank 7 stably enters the pipeline 6.
Referring to fig. 4, it is a schematic diagram of an on-line viscometer, which is mounted on a pipeline 6 through a flange 1.1, and 1.2 is a stainless steel probe for detecting temperature and viscosity values.
Referring to fig. 5, when the power switch 9.36 is turned on, the display screen 9.31 displays the current and voltage outputted at this time, after an initial voltage is given by the voltage coarse adjustment knob 9.32 and the voltage fine adjustment knob 9.33, the current coarse adjustment knob 9.37 and the current fine adjustment knob 9.38 are adjusted to precisely change the magnitude of the output current, so as to achieve the effect of changing the magnitude of the magnetic field of the pipeline, note that the maximum current value outputted at this time cannot exceed the fusing current of the enameled wire wound with the copper core, and the calculation formula is Id＝80d3/2。
Referring to fig. 6, in the experimental process, the flow property of the liquid and the change rule of the axial magnetic field are mainly explored by observing and recording the numerical value change of the measuring device, which is specifically represented as follows: the relationship among three factors of magnetic induction intensity, magnetic treatment time and magnetic treatment temperature, liquid viscosity and flow.
Now, a specific embodiment is given, in this embodiment: crude oil was used as the experimental liquid. The length of the pipeline 6 is 360cm, the inner diameter of the pipeline is 2cm, and in order to avoid the influence of heating of a coil wound after electrification on fluid in the pipeline, a heat insulation layer is arranged on the outer wall of the pipeline. The tightly wound metal coil 4 is wound by a copper core enameled wire in a single layer, the inner diameter is 0.5mm, the winding direction of the wound coil is the same and is divided into two sections, the winding degree of each section is 12cm, and the number of turns n at the moment is about 2000 turns/m. The fixed clamps 5 are respectively arranged at two ends of the coil, can adjust tightness, can move on the pipeline, and conveniently adjust the number of turns of each section of the coil.
When a 0.5mm copper core is used, the fusing current is 28A, and the field intensity range generated in the pipeline can be estimated by adopting an ideal formula: mu is B ═ mu0nI (here. mu. with0The magnetic permeability in vacuum is 1.2566X 10-6) At this time, the field intensity range is 0 to 70mT, and if the number of winding coil layers is n, the field intensity range is 0 to 70 nmT.
The invention relates to a using method of an adjustable external axial magnetic field experimental device, which mainly comprises the following steps:
the method comprises the following steps: the experimental device is shown in figure 1, a valve 3 is in a closed state, sufficient crude oil for experiments is prepared in a liquid storage tank 10, a pump 10.1 is started to enable the crude oil to flow into a constant-pressure constant-flow tank 7 until the crude oil overflows from an overflow plate 7.1, a pipeline 6 is filled with the crude oil at the moment, the valve 3 is opened, and when the crude oil stably flows out, the initial flow Q of the crude oil under the condition without a magnetic field is recorded at the moment0Temperature T0Viscosity mu0。
Step two: the circuit is connected according to the wiring mode of figure 2a, the effective magnetic field length generated by the pipeline is the sum of the winding lengths of the two sections of metal coils 4, the main switch 9.4 of the external control circuit is in an off state,
step three: closing valve 3 to refill pipeline 6 with crude oil, and pumpingD.C. voltage-stabilized source 9.3 is turned on, and output voltage is kept to initial value V1The output current is regulated to be I by the unchanged knob, and the smaller output current is set to be I1At the moment, the main switch 9.4 is closed, an axial magnetic field is generated in the pipeline, and the time t of magnetic treatment is recorded1The switch is turned off, the outlet valve 3 is opened, and the flow Q of the crude oil under the magnetic treatment condition at the moment is recorded1Temperature T1Viscosity mu1。
Step four: after the crude oil magnetically treated in the step is completely discharged, the valve 3 is closed, the crude oil is controlled to refill the pipeline, and the initial value V of the output voltage is kept1The output current knob is adjusted to increase the output current to I2After the main line switch is closed, a new magnetic field is generated in the pipeline, and the time t of magnetic treatment is recorded2Opening the valve 3 and recording the flow Q of the crude oil under the condition of the magnetic field at the moment2Temperature T2Viscosity mu2。
Step five: and referring to the third step and the fourth step, continuously adjusting the output current knob to increase the current I, and recording the corresponding flow, temperature and viscosity of the crude oil after magnetic treatment with time t. And the rest can be analogized in turn to obtain a series of experimental data. Similarly, the circuit connection mode shown in fig. 2(b) and fig. 2(c) can be adopted to generate magnetic fields with different lengths; the purpose of magnetic fields with different lengths can be achieved by adjusting the number of turns of each section through the fixed hoop.
As shown in fig. 6, since the viscosity and the fluidity of the crude oil are related to the magnetic field strength, the magnetic treatment time and the temperature in the experiment, each variable should be fully considered during the experiment, and a controlled variable method can be adopted, so that only one parameter is changed in each group of experiments, which is more favorable for obtaining accurate experiment results.
Although preferred embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides an adjustable plus axial magnetic field experimental apparatus which characterized in that: comprises a current stabilizer, a magnetic field generating device and a measuring device;
the flow stabilizing device comprises a pipeline (6), a constant-pressure flow stabilizing box (7), a liquid storage box (10) and a transfer box (8); the inlet end of the pipeline (6) is communicated with the constant-pressure and constant-flow box (7), the outlet end of the pipeline is communicated with the transfer box (8), and the liquid storage box (10) is positioned below the constant-pressure and constant-flow box (7), is connected with the bottom of the constant-pressure and constant-flow box (7) and is used for supplying liquid to the constant-pressure and constant-flow box (7);
the magnetic field generating device comprises a metal coil (4), a fixed hoop (5) and a control circuit (9); the metal coil (4) is wound outside the pipeline (6), and two ends of the metal coil (4) are connected with the control circuit (9) and used for generating a magnetic field; the fixed hoops (5) are arranged at two ends of the coil (4), and the fixed hoops (5) can move on the pipeline (6) and are used for fixing the coil (4) and adjusting the length of the wound coil;
the measuring device comprises a flowmeter (2) and an online viscometer (1); the flowmeter (2) and the online viscometer (1) are arranged at the outlet end of the pipeline (6);
a liquid inlet (7.4) and a liquid outlet (7.5) are arranged at the bottom of the constant-pressure constant-current box (7); an overflow plate (7.1), a flow stabilizing plate (7.2) and a flow stabilizing ball (7.3) are arranged in the constant-pressure flow stabilizing box (7); the liquid inlet (7.4) is arranged between the overflow plate (7.1) and the flow stabilizing plate (7.2); the flow stabilizing plate (7.2) is arranged between the liquid inlet (7.4) and the liquid outlet (7.5); the flow stabilizing ball (7.3) is arranged at the liquid inlet (7.4) to control the liquid to flow in stably; the height of the flow stabilizing plate (7.2) is lower than that of the overflow plate (7.1);
a pump (10.1), a liquid inlet pipe (10.2) and a liquid outlet pipe (10.3) are arranged in the liquid storage tank (10); the pump (10.1) is connected with the liquid inlet (7.4) through a liquid inlet pipe (10.2); the liquid outlet pipe (10.3) is connected with the liquid outlet (7.5).
2. An adjustable external axial magnetic field experimental device according to claim 1, wherein: the external part of the pipeline (6) is tightly wound with two sections of metal coils (4), the metal coils (4) can be made of copper core enameled wires, a heat insulation layer is arranged between the pipeline (6) and the wound coils, and the outlet end of the pipeline (6) is provided with a valve (3).
3. An adjustable external axial magnetic field experimental device according to claim 2, wherein: the inner diameter of the pipeline (6) is optimally 1-3 cm, and the length of the pipeline is optimally 2-3 m; the inner diameter of the metal coil (4) is controlled within the range of 0.4 mm-1.0 mm, the winding length of each section of coil is controlled to be 0.6-1.2 m, and the number of turns is optimally controlled to be 800-3600 turns/m.
4. An adjustable external axial magnetic field experimental device according to claim 1, wherein: the control circuit (9) is formed by connecting a lead (9.1), a protection device (9.2), a direct-current stabilized power supply (9.3), a main switch (9.4) and a lead interface (9.5) in series.
5. An adjustable external axial magnetic field experimental device according to claim 1, wherein: the inner diameter of the liquid inlet pipe (10.2) is smaller than or equal to that of the liquid outlet pipe (10.3), and the inner diameter of the liquid inlet pipe (10.2) is larger than or equal to that of the pipeline (6).
6. The use method of the experimental device for the adjustable external axial magnetic field according to any one of claims 1 to 5, characterized by comprising the following steps:
the method comprises the following steps: the experimental device is assembled, the valve (3) is in a closed state, sufficient crude oil for experiments is prepared in the liquid storage tank (10), the pump (10.1) is started to enable the crude oil to flow into the constant-pressure constant-current tank (7) until the crude oil overflows from the overflow plate (7.1), the pipeline (6) is filled with the crude oil at the moment, the valve (3) is opened, and when the crude oil stably flows out, the initial flow Q of the crude oil under the magnetic field-free condition at the moment is recorded through the flow meter (2) and the online viscometer (1)0Temperature T0Viscosity mu0；
Step two: closing the valve (3) to refill the conduit (6) with crude oil, and selecting a length L1The metal coil (4) is connected with a control circuit (9), a direct current stabilized voltage supply (9.3) is switched on, and the output voltage is kept to be an initial value V1The output current is regulated without changing, and is firstly setA smaller output current of I1At the moment, a main switch (9.4) is closed, an axial magnetic field is generated in the pipeline (6), and the time t of magnetic treatment is recorded1The main switch (9.4) is disconnected, the valve (3) is opened, and the flow Q of the crude oil under the magnetic treatment condition at the moment is recorded1Temperature T1Viscosity mu1；
Step three: after the crude oil magnetically treated in the step is completely discharged, the valve (3) is closed, the crude oil is controlled to refill the pipeline, and the initial value V of the output voltage is kept1The output current knob is adjusted to output different current values I without changingiI ═ 2, 3, 4 …; after the main switch is closed, a new magnetic field is generated in the pipeline, and the time t of magnetic treatment is recordediOpening the valve 3 and recording the flow Q of the crude oil under the condition of the magnetic field at the momentiTemperature TiViscosity mui；
Step four: and selecting metal coils (4) with different lengths to be connected with a control circuit (9), and repeating the operation contents of the second step and the third step to obtain the metal coils with different lengths and the flow rate, the temperature and the viscosity value of the crude oil under different current values.
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