CN109541008A - Reduce, test the method and device of gelled crude yield stress - Google Patents
Reduce, test the method and device of gelled crude yield stress Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000010779 crude oil Substances 0.000 claims abstract description 123
- 230000005684 electric field Effects 0.000 claims abstract description 55
- 239000003921 oil Substances 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 50
- 230000003287 optical effect Effects 0.000 claims description 11
- 239000011810 insulating material Substances 0.000 claims description 7
- 238000010008 shearing Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 5
- 238000011156 evaluation Methods 0.000 abstract description 4
- 238000000926 separation method Methods 0.000 abstract 1
- 230000009897 systematic effect Effects 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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- 238000001556 precipitation Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
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- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
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Abstract
The present invention provides a kind of method and devices for reducing, testing the yield stress of gelled crude, and method includes: the electric field for applying preset strength to the crude oil being gelled, to reduce the yield stress of gelled crude.The present invention can carry out electric field treatment to the crude oil being gelled, and significantly reduce its yield stress.Meanwhile to may be implemented electric field treatment integrated with treatment effect evaluation for the device of the invention, save the time, it is easy to operate while, avoid due to processing test device separation, oil sample bring systematic error shifted between two kinds of devices of.
Description
Technical Field
The invention relates to a crude oil processing technology, in particular to a method and a device for reducing and testing the yield stress of gelled crude oil.
Background
Most of crude oil produced in China is waxy crude oil, and the yield of the waxy crude oil is rapidly increased worldwide. The presence of wax in such waxy crude oils makes their rheological properties very complex. When the temperature is higher, the wax is dissolved in the crude oil in a molecular state, and the crude oil system is Newtonian fluid; when the temperature is reduced to the wax precipitation point (WAT) of the crude oil, the wax dissolved in the crude oil begins to be precipitated due to supersaturation, and the system is still Newtonian fluid at the moment; the temperature is further reduced, the amount of the precipitated wax is gradually increased, and the system is converted from Newtonian fluid to non-Newtonian fluid; when the amount of the precipitated wax reaches about 2 percent of that of the crude oil, wax crystal particles are mutually crosslinked to form a network structure, the liquid crude oil is wrapped in the network structure, and the system is converted into gel from liquid. The formation of the network structure makes the crude oil show complex rheological characteristics such as yield stress, viscoelasticity and thixotropy.
After the petroleum pipeline stops transportation, the crude oil is gelled due to the reduction of the oil temperature, and the restart failure of the pipeline can be caused. Therefore, the safety of pipeline restart is a core issue facing the operation of waxy crude pipelines. While yield stress is the root cause of pipe congealing, those skilled in the art of crude oil transportation are particularly concerned with crude oil yield stress and are working to reduce the yield stress of gelled crude oil.
In the prior art, in order to avoid a pipe coagulation accident, the pipeline is started before crude oil loses fluidity by controlling the stop time, so that the pipe coagulation accident is avoided. Still other methods include: the chemical modification method of adding the chemical additive (pour point depressant) pour point depressant and the improvement of the oil transportation temperature are applied to the transportation process of the wax-containing crude oil. However, these methods are preventive measures and can only avoid the occurrence of a pipe coagulation accident to a certain extent, i.e., prevent the crude oil from being gelled. However, these methods fail when a pipe-in event occurs, i.e., the crude oil has gelled, resulting in a failed restart of the pipeline, because they act on ungelled crude oil and do not directly reduce the yield stress of gelled crude oil. Therefore, the technical problem to be solved in the field of petroleum transportation is to provide a method for effectively reducing the yield stress of gelled crude oil.
Disclosure of Invention
In order to reduce and test the yield stress of the gelled crude oil, be beneficial to stopping and restarting a pipeline and ensure the safety of the pipeline, the invention provides a method for reducing the yield stress of the gelled crude oil, which comprises the following steps:
and applying an electric field with preset intensity to the gelled crude oil so as to reduce the yield stress of the gelled crude oil.
In the embodiment of the invention, the gelled crude oil comprises: low wax crude, waxy crude, and high wax crude.
In the embodiment of the invention, the applied electric field intensity is 0kV/mm-10 kV/mm.
In the embodiment of the invention, the duration of the applied electric field is not less than 10 s.
In an embodiment of the invention, the applied electric field comprises: a direct current electric field or an alternating current electric field or a pulsed electric field.
Meanwhile, the invention also provides a device for reducing the yield stress of the gelled crude oil, which comprises: a circulating water jacket, an inner electrode and an outer electrode; the outer electrode is arranged on the inner side wall of the circulating water jacket, and an accommodating space is formed between the outer electrode and the inner electrode; wherein,
and placing the crude oil in the accommodating space, connecting high-low temperature circulating water bath equipment through a circulating water jacket, cooling the crude oil to form gelled crude oil, applying electric energy to the inner electrode and the outer electrode, and applying an electric field with preset strength to the gelled crude oil between the inner electrode and the outer electrode so as to reduce the yield stress of the gelled crude oil.
In the embodiment of the invention, the distance between the inner electrode and the outer electrode is 0.1mm-10 mm.
In the embodiment of the present invention, the apparatus further includes: and the high-voltage power supply is connected with the inner electrode and the outer electrode so as to apply electric energy to the inner electrode and the outer electrode.
In the embodiment of the invention, the shape of the circulating water jacket comprises: circular or quadrilateral or polygonal;
the inner electrode is formed into the same shape as the circulating water jacket, and an accommodating space is formed between the inner electrode and an outer electrode arranged on the inner wall of the circulating water jacket.
In the embodiment of the present invention, the apparatus further includes: high and low temperature circulating water bath equipment; the circulating water jacket is provided with a water inlet and a water outlet and is connected with high-low temperature circulating water bath equipment so as to control the temperature of the oil sample in the accommodating space.
Further, the present invention also provides an apparatus for testing the yield stress of gelled crude oil, comprising: the device comprises a torque control motor, an optical sensor, a rotor, a rotating shaft, a circulating water jacket, an inner electrode and an outer electrode; wherein,
the optical sensor and the torque control motor are arranged at one end of the rotating shaft, the rotor is arranged at the other end of the rotating shaft, the inner electrode is arranged on the rotor, the outer electrode is arranged on the inner side wall of the circulating water jacket, and an accommodating space is formed between the outer electrode and the inner electrode; the inner electrode is circular, and an accommodating space is formed between the inner electrode and the outer electrode on the inner wall of the circulating water jacket.
The crude oil is placed in the accommodating space, electric energy is applied to the inner electrode and the outer electrode, an electric field with preset strength is applied to the gelled crude oil between the inner electrode and the outer electrode, the torque control motor controls the shearing stress of the rotating shaft, the optical sensor is used for collecting the rotating speed of the rotating shaft, and the external equipment determines the yield stress of the gelled crude oil according to the shearing stress and the rotating speed of the rotating shaft.
In the embodiment of the invention, the device for testing the yield stress of the gelled crude oil further comprises: and an insulating material through which the rotor is connected to the rotation shaft.
The invention can carry out electric field treatment on the gelled crude oil, and obviously reduce the yield stress of the gelled crude oil. Meanwhile, the device can realize the integration of electric field treatment and treatment effect evaluation, saves time, is simple to operate, and avoids system errors caused by transferring oil samples between two devices when the conventional treatment testing device is separated. In addition, the device of the invention can be applied to the field of crude oil transportation, and the related technical personnel in the field of electrorheological fluid can also adopt the device to process and test the electrorheological fluid.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic illustration of an apparatus for reducing the yield stress of gelled crude oil according to the present disclosure;
FIG. 2 is a schematic diagram of the disclosed apparatus for testing the yield stress of gelled crude oil.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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 aims to provide a method for reducing the yield stress of gelled crude oil, which applies an electric field with preset strength to the gelled crude oil so as to reduce the yield stress of the gelled crude oil. The invention can obviously reduce the yield stress of the gelled crude oil, is beneficial to stopping and restarting the pipeline and ensures the safety of the pipeline.
It is also an object of the present invention to provide an apparatus for reducing the yield stress of gelled crude oil, as shown in fig. 1, comprising: a circulating water jacket 31, an inner electrode 14, and an outer electrode 13; the outer electrode 13 is arranged on the inner side wall of the circulating water jacket 31, and an accommodating space is formed between the outer electrode and the inner electrode 14;
the crude oil is placed in the accommodating space, the circulating water jacket is connected with high-low temperature circulating water bath equipment to cool the crude oil to form gelled crude oil, electric energy is applied to the inner electrode 14 and the outer electrode 13, and an electric field with preset strength is applied to the gelled crude oil between the inner electrode 14 and the outer electrode 13 to reduce the yield stress of the gelled crude oil.
The invention provides a method and a device for reducing yield stress of gelled crude oil by using an electric field, which are used for processing the gelled crude oil by applying the electric field.
In the examples of the present invention, the crude oil is a waxy crude oil. Preferably, the crude oil is a low wax crude oil, a waxy crude oil, a high wax crude oil. More preferably, highly waxy crude oil. Further, the waxy crude oil in this example contained no moisture.
In the embodiment of the invention, the gelled crude oil is subjected to electric field treatment to reduce the yield stress of the gelled crude oil. .
In the embodiment of the invention, the electric field is a direct current electric field, an alternating current electric field or a pulse electric field, and the electric field intensity of the electric field is 0kV/mm-10 kV/mm; preferably 0.8kV/mm to 10 kV/mm. Wherein, the larger the electric field intensity is, the more obvious the yield stress is reduced, and the electric field intensity can be adjusted according to specific requirements. It should be noted that the electric field strength is too low, and there is no significant effect; breakdown can occur when the voltage is too high.
The treatment time of the electric field treatment is at least 10s, preferably 10s to 300 s. When the electric field treatment time is less than 10s, the yield stress is not obviously reduced; after the electric field treatment time exceeds 300s, the yield stress is not further reduced, and energy is wasted.
Compared with the prior art, the scheme has the advantages that: the scheme can be used for treating the gelled crude oil, and is favorable for stopping and restarting a crude oil pipeline. The scheme is a physical treatment method, which does not affect the quality of crude oil and does not damage the environment.
In another aspect, the present invention further provides an apparatus for testing the yield stress of gelled crude oil, in an embodiment of the present invention, the apparatus includes a high-voltage electric field processing apparatus, a testing system and a temperature-controlled water bath device, as shown in fig. 2, wherein:
the high-voltage electric field processing device comprises: a high voltage generator 11, a lead 12, an outer electrode 13 and an inner electrode 14. The high voltage generated by the high voltage generator 11 is transmitted to the inner and outer electrode plates through the lead 12, and an electric field is generated between the electrode plates to process crude oil.
The test system comprises: a torque-controlled motor 21, an optical sensor 22, a rotating shaft 23, an insulating material 24, and a rotor 25. The rotor 25 is connected with the rotating shaft 23 through an insulating material 24, the optical sensor and the torque control motor are arranged at one end of the rotating shaft, and the optical sensor is used for scanning nicks on the rotating shaft so as to obtain the rotating speed and the accumulated rotating angle to test the yield stress of the crude oil.
The temperature control device comprises: a circulating water jacket 31 and a high-low temperature constant temperature circulating device (not shown in the figure); the circulating water jacket 31 is wrapped on the outer side of the outer electrode plate 13 and is connected with an external high-low temperature constant temperature circulating device through a water inlet 32 and a water outlet 33.
According to the device for reducing and testing the yield stress of the gelled crude oil, the high-voltage generator 11 can generate direct current, alternating current and pulse electricity. The voltage range is 0kV-10 kV.
The lead 12 is made of aluminum or copper having good conductivity, and is preferably made of copper. It should be noted that the experimental apparatus needs to be well grounded, the grounding in this embodiment is a conventional device used in the art, and a person skilled in the art can select a grounding manner and a grounding material according to needs, and in this embodiment of the present invention, a copper wire with good conductivity is used.
According to the device for reducing and testing the yield stress of the gelled crude oil, the inner electrode plate and the outer electrode plate of the device are metal plates, the inner electrode plate and the outer electrode plate are coaxially arranged, and the distance between the electrode plates is 0.1mm-10mm, preferably 0.4mm-2 mm. For specific pole plate materials, a person skilled in the art can process and manufacture the pole plates according to actual needs, and in the embodiment of the application, the inner pole plate and the outer pole plate are both copper pole plates with good conductivity.
The torque control motor 21 drives the rotor to rotate through the rotating shaft, and can be flexibly selected according to actual conditions.
The device for reducing and testing the yield stress of the gelled crude oil has the scale marks on the rotating shaft, and the 360-degree circumference is divided into 1 x 105The optical sensor 22 is used for scanning the scale on the rotating shaft, so as to test the rotating speed of the rotating shaft.
According to the device for reducing and testing the yield stress of the gelled crude oil, disclosed by the invention, the insulating material 24 is used for isolating high-voltage electricity on the rotor and needs to have good insulating property, and is preferably polytetrafluoroethylene.
According to the device for reducing and testing the yield stress of the gelled crude oil, the high-low temperature constant-temperature water bath circulating device is used for regulating and controlling the temperature of the experimental crude oil in the treatment process. The used circulating liquid sleeve and the high-low temperature constant-temperature circulating device are conventional equipment used in the field, and a person skilled in the art can select a proper means to control the temperature according to the field operation requirement, wherein the temperature range is controlled to be-20-100 ℃, and is preferably-20-80 ℃.
In another aspect, the embodiment of the invention also provides the application of the device for reducing and testing the yield stress of the gelled crude oil in reducing and testing the yield stress of the crude oil.
Before the experiment, the water bath temperature of the device is set to the temperature of the oil sample, and the temperature is kept for 30min, so that the temperature of each part of the instrument is the same. And then, filling the oil sample into an annular accommodating space defined by the inner and outer electrodes and the water jacket, adjusting a water bath procedure as required, and cooling to a treatment temperature (the temperature is lower than the gelation temperature of the oil sample) according to a required cooling rate. After the temperature reduction is finished, a certain constant temperature time can be determined according to actual conditions, and the formation of a gel structure is ensured. And after the preset constant temperature time is reached, starting the electric field treatment equipment, and selecting the required voltage range and treatment time to carry out electric field treatment on the crude oil. And finally, starting the torque-controlled motor to test the gelled oil stress-strain relationship to obtain the oil sample yield stress (the yield phenomenon means that when the stress reaches a certain value, the stress is slightly increased, but the strain is rapidly increased, so that the stress of yielding the material is the yield stress). In contrast, the oil sample yield stress can be tested without loading an electric field under the same other conditions, and the treatment result can be evaluated.
The device for reducing and testing the yield stress of the gelled crude oil provided by the invention has the following characteristics and advantages:
the device can carry out electric field treatment on the gelled crude oil, and obviously reduce the yield stress of the gelled crude oil. Meanwhile, the device can realize the integration of electric field treatment and treatment effect evaluation, saves time, is simple to operate, and avoids system errors caused by transferring oil samples between two devices when the conventional treatment testing device is separated. In addition, the device not only can be applied to the crude oil field of carrying, and the relevant technical personnel in the electrorheological field also can adopt the device to carry out processing and test to the electrorheological fluid.
In one embodiment of the invention, the high voltage generator generates 0kV to 10kV direct current high voltage, the used lead is a copper lead, the inner electrode and the outer electrode both adopt copper electrodes, and the distance between the inner electrode plate and the outer electrode plate is 0.8 mm. The high voltage generated by the high voltage generator is transmitted to the inner and outer electrode plates through the lead, and a direct current high voltage electric field is generated between the electrode plates to process the crude oil. The torque control motor is a current control torque motor, and the insulating material is polytetrafluoroethylene. The rotor is connected with the rotating shaft through an insulating material, and the rotating shaft is connected with the torque-controlled motor and the optical sensor to test the yield stress of the crude oil.
This example uses a crude oil having a wax content of 14.94 wt% (gel temperature 18 ℃ C.) as the experimental oil sample. Before the experiment, pretreatment is carried out to eliminate the thermal history and shear history, and the specific operation is that an oil sample contained in a ground bottle is heated to 80 ℃ in a water bath and is kept at the constant temperature for 2 hours to be used as a basic sample of the experiment. Before the experiment, the water bath temperature of the device is set to the temperature of the oil sample, and the temperature is kept constant for 30min, so that the temperature of each part of the instrument is ensured to be the same.
The oil sample is put into the device provided by the invention, the water bath procedure is adjusted, the temperature is reduced to 10 ℃ at the cooling rate of 0.5 ℃/mm, and the temperature is kept for 90min, so that the full formation of a gel structure is ensured. Then, the high-voltage electric field processing equipment is turned on, the output voltage is set to be 5kV, and the processing time is set to be 90 s. After the treatment, the test system was opened and the yield stress was measured to be 12.48 Pa. In contrast, the same oil sample was replaced, the voltage was set to 0kV, and the yield stress was 111.31Pa when the other conditions were not changed. Comparing the results of two experiments, the gelled crude oil yield stress is reduced by 88.8% through the treatment of the device (the applied voltage is 5kV, the electric field intensity is 5kV/0.8mm ═ 6.25kV/mm, and the electric field with the action time of 90 s). The temperature was then varied and the yield stress before and after treatment was tested at different temperatures as shown in table 1.
TABLE 1
According to the invention, the electric field is applied to the gelled crude oil to reduce the yield stress of the crude oil, and the electric field treatment on the gelled crude oil can be realized by using the device disclosed by the invention, so that the yield stress of the gelled crude oil is obviously reduced. Meanwhile, the device can realize the integration of electric field treatment and treatment effect evaluation, saves time, is simple to operate, and avoids system errors caused by transferring oil samples between two devices when the conventional treatment testing device is separated. In addition, the device not only can be applied to the crude oil field of carrying, and the relevant technical personnel in the electrorheological field also can adopt the device to carry out processing and test to the electrorheological fluid.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (16)
1. A method of reducing the yield stress of gelled crude oil, said method comprising:
and applying an electric field with preset intensity to the gelled crude oil so as to reduce the yield stress of the gelled crude oil.
2. The method of reducing the yield stress of gelled crude oil of claim 1, wherein the gelled crude oil comprises: low wax crude, waxy crude, and high wax crude.
3. The method for reducing the yield stress of gelled crude oil of claim 1, wherein the electric field is applied for a period of not less than 10 seconds.
4. The method of reducing the yield stress of gelled crude oil of claim 1, wherein the applied electric field comprises: a direct current electric field or an alternating current electric field or a pulsed electric field.
5. The method for reducing the yield stress of gelled crude oil of claim 1, wherein the electric field is applied at a strength of 0kV/mm to 10 kV/mm.
6. An apparatus for reducing the yield stress of gelled crude oil, said apparatus comprising: a circulating water jacket, an inner electrode and an outer electrode; the outer electrode is arranged on the inner side wall of the circulating water jacket, and an accommodating space is formed between the outer electrode and the inner electrode; wherein,
and placing the crude oil in the accommodating space, applying electric energy to the inner electrode and the outer electrode, and applying an electric field with preset strength to the gelled crude oil between the inner electrode and the outer electrode so as to reduce the yield stress of the gelled crude oil.
7. The apparatus for reducing yield stress of gelled crude oil according to claim 6, wherein the distance between the inner and outer electrodes is 0.1mm to 10 mm.
8. The apparatus for reducing the yield stress of gelled crude oil of claim 6, further comprising: and the high-voltage power supply is connected with the inner electrode and the outer electrode so as to apply electric energy to the inner electrode and the outer electrode.
9. The apparatus for reducing yield stress of gelled crude oil of claim 6, wherein the circulating water jacket has a shape comprising: circular or quadrilateral or polygonal;
the inner electrode is formed into the same shape as the circulating water jacket, and an accommodating space is formed between the inner electrode and an outer electrode arranged on the inner wall of the circulating water jacket.
10. The apparatus for reducing the yield stress of gelled crude oil of claim 6, further comprising: high and low temperature circulating water bath equipment; the circulating water jacket is provided with a water inlet and a water outlet and is connected with high-low temperature circulating water bath equipment so as to control the temperature of the oil sample in the accommodating space.
11. An apparatus for testing the yield stress of gelled crude oil, said apparatus comprising: the device comprises a torque control motor, an optical sensor, a rotor, a rotating shaft, a circulating water jacket, an inner electrode and an outer electrode; wherein,
the optical sensor and the torque control motor are arranged at one end of the rotating shaft, the rotor is arranged at the other end of the rotating shaft, the inner electrode is arranged on the rotor, the outer electrode is arranged on the inner side wall of the circulating water jacket, and an accommodating space is formed between the outer electrode and the inner electrode;
the crude oil is placed in the accommodating space, electric energy is applied to the inner electrode and the outer electrode, an electric field with preset strength is applied to the gelled crude oil between the inner electrode and the outer electrode, the torque control motor controls the shearing stress of the rotating shaft, the optical sensor is used for testing the rotating speed of the rotating shaft, and the external equipment determines the yield stress of the gelled crude oil according to the shearing stress and the rotating speed of the rotating shaft.
12. The apparatus for testing gelled crude oil yield stress according to claim 11, wherein the inner electrode and the outer electrode are spaced apart by a distance of 0.1mm to 10 mm.
13. The apparatus for testing gelled crude oil yield stress as defined in claim 11, further comprising: and the high-voltage power supply is connected with the inner electrode and the outer electrode so as to apply electric energy to the inner electrode and the outer electrode.
14. The apparatus for testing the yield stress of gelled crude oil of claim 11, wherein the circulating water jacket has a shape of: a circular shape;
the inner electrode is circular, and an accommodating space is formed between the inner electrode and the outer electrode on the inner wall of the circulating water jacket.
15. The apparatus for testing gelled crude oil yield stress as defined in claim 11, further comprising: high and low temperature circulating water bath equipment; the circulating water jacket is provided with a water inlet and a water outlet and is connected with high-low temperature circulating water bath equipment so as to control the temperature of the oil sample in the accommodating space.
16. The apparatus for testing gelled crude oil yield stress as defined in claim 11, further comprising: and an insulating material through which the rotor is connected to the rotation shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811599769.4A CN109541008A (en) | 2018-12-26 | 2018-12-26 | Reduce, test the method and device of gelled crude yield stress |
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| CN201811599769.4A CN109541008A (en) | 2018-12-26 | 2018-12-26 | Reduce, test the method and device of gelled crude yield stress |
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| Publication number | Priority date | Publication date | Assignee | Title |
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