CN108690654B - Comprehensive treatment method for improving flow property of crude oil by using electric field and stirring - Google Patents
Comprehensive treatment method for improving flow property of crude oil by using electric field and stirring Download PDFInfo
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- CN108690654B CN108690654B CN201810520139.7A CN201810520139A CN108690654B CN 108690654 B CN108690654 B CN 108690654B CN 201810520139 A CN201810520139 A CN 201810520139A CN 108690654 B CN108690654 B CN 108690654B
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- 239000010779 crude oil Substances 0.000 title claims abstract description 87
- 230000005684 electric field Effects 0.000 title claims abstract description 74
- 238000003756 stirring Methods 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 66
- 239000003921 oil Substances 0.000 claims abstract description 75
- 230000021715 photosynthesis, light harvesting Effects 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 16
- 238000013019 agitation Methods 0.000 claims abstract description 10
- 238000001556 precipitation Methods 0.000 claims description 7
- 238000009833 condensation Methods 0.000 claims description 6
- 230000005494 condensation Effects 0.000 claims description 6
- 239000000295 fuel oil Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 230000009467 reduction Effects 0.000 abstract description 31
- 230000000694 effects Effects 0.000 abstract description 14
- 230000001603 reducing effect Effects 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 18
- 230000004048 modification Effects 0.000 description 10
- 238000012986 modification Methods 0.000 description 10
- 230000000994 depressogenic effect Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 239000000693 micelle Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009775 high-speed stirring Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G32/00—Refining of hydrocarbon oils by electric or magnetic means, by irradiation, or by using microorganisms
- C10G32/02—Refining of hydrocarbon oils by electric or magnetic means, by irradiation, or by using microorganisms by electric or magnetic means
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/20—Characteristics of the feedstock or the products
- C10G2300/30—Physical properties of feedstocks or products
- C10G2300/304—Pour point, cloud point, cold flow properties
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Lubricants (AREA)
Abstract
The present invention provides an integrated process for improving the flow properties of crude oil using an electric field and agitation, said process comprising the steps of: firstly, applying an electric field with certain strength to the crude oil to obtain a modified oil product; stirring the modified oil product according to certain energy dissipation to obtain an oil product after comprehensive treatment; or, firstly, stirring the crude oil according to certain energy dissipation to obtain a modified oil product; and applying an electric field with certain strength to the modified oil product to obtain the oil product after comprehensive treatment. Compared with the existing method for improving the flow property of crude oil by using an electric field, the method provided by the invention can further improve the viscosity reduction range, so that the low-temperature flow property of oil products is improved; the viscosity reduction amplitude under the same energy dissipation is the same, so that a basis is provided for predicting the viscosity reduction effect; meanwhile, the method has long timeliness in the viscosity reducing effect and is more suitable for the requirement of actual production.
Description
Technical Field
The invention relates to a comprehensive treatment method for improving the fluidity of crude oil by using an electric field and stirring, belonging to the technical field of viscosity reduction of oil products.
Background
Crude oil produced in land and ocean oil fields in China has high viscosity at normal temperature and even low temperature, and has poor fluidity, which is well known in the field. Reducing the viscosity of crude oil to improve the fluidity of crude oil is a problem often encountered in the process of pipeline transportation of crude oil. For the wax-containing crude oil, when the oil temperature is lower than the wax precipitation point, wax crystals in the crude oil are gradually separated out, and the separated wax crystals are mutually connected to form a spongy three-dimensional network structure along with further reduction of the temperature, so that the apparent viscosity of the crude oil is remarkably increased, and the flowing of the crude oil is hindered. Similarly, in the case of thick oil, asphaltenes in crude oil aggregate with each other at low temperature to form fine micelles or micelles, increasing apparent viscosity, resulting in deterioration of low-temperature fluidity of thick oil. Therefore, the research on the new technology for improving the low-temperature fluidity of the crude oil and the application of the new technology in the production and pipeline transportation of the crude oil have very important significance for safely and efficiently transporting the crude oil.
In order to improve the low-temperature fluidity of crude oil, techniques such as heating transportation, dilution transportation, chemical agent modification transportation and the like are commonly used, but the techniques all have certain defects, such as high energy consumption required by modification, poor universality and the like. In addition, electric field treatment has recently been widely used as a new crude oil modification method, and the modified crude oil has significantly improved fluidity, but has problems of not lasting modification effect, not comprehensive evaluation of modification effect, and the like.
disclosure of Invention
In order to solve the above disadvantages and shortcomings, the present invention is directed to a comprehensive treatment method for improving the fluidity of crude oil using an electric field and agitation. Compared with the existing method for improving the flow property of crude oil by using an electric field, the method provided by the invention can further improve the viscosity reduction range, so that the low-temperature flow property of oil products is improved; the viscosity reduction amplitude under the same energy dissipation is the same, so that a basis can be provided for predicting the viscosity reduction effect; meanwhile, the method has long timeliness in the viscosity reducing effect and is more suitable for the requirement of actual production.
to achieve the above objects, the present invention provides an integrated processing method for improving the fluidity of crude oil using an electric field and agitation, the method comprising the steps of:
Firstly, applying an electric field with certain strength to the crude oil to obtain a modified oil product; stirring the modified oil product according to certain energy dissipation to obtain an oil product after comprehensive treatment;
Or, firstly, stirring the crude oil according to certain energy dissipation to obtain a modified oil product; and applying an electric field with certain strength to the modified oil product to obtain the oil product after comprehensive treatment.
According to the method provided by the invention, the sequence of applying the electric field and stirring can be reasonably adjusted by a person skilled in the art according to the needs of field operation, and preferably, the method comprises the following steps: firstly, applying an electric field with certain strength to the crude oil to obtain a modified oil product; and stirring the modified oil product according to certain energy dissipation to obtain the oil product after comprehensive treatment.
According to the method of the present invention, preferably, the crude oil includes waxy crude oil, heavy oil and mixed crude oil thereof.
Preferably, according to the method of the present invention, the crude oil is a waxy crude oil.
According to the method of the invention, preferably, the wax content of the wax-containing crude oil is higher than 2.5 wt%, and the relative dielectric constant is 1.8-2.7. Wherein the wax content is calculated based on the total weight of the waxy crude oil being 100%.
According to the method of the invention, the stirring system used in the stirring process can be a coaxial cylinder or a conventional paddle used in the crude oil stirring process, and in a preferred embodiment of the invention, the stirring system used is a coaxial cylinder rotor and a coaxial cylinder rotating cylinder.
According to the method of the invention, preferably, the electric field is a direct current electric field or a pulse electric field, and the electric field intensity is 0.1kV/mm to 2.0 kV/mm;
more preferably, the electric field strength is 0.4kV/mm to 1.5 kV/mm;
Still more preferably, the electric field is applied for a time of 30s to 120 s. According to the method of the present invention, preferably, the time interval of the pulsed electric field is 1s to 60 s.
According to the method of the present invention, preferably, the number of the electric fields is 1 to 4. According to the method of the present invention, preferably, the average shear rate of the stirring is 150s-1To 2000s-1the stirring temperature is between the condensation point and the wax precipitation point of the crude oil, and the stirring time is 200 s-600 s.
According to the method of the invention, preferably, the energy dissipation is 4.70 x 105-631.80×105J/m3. In a more preferred embodiment of the invention, the energy dissipation is 12.06 × 105-631.80×105J/m3. Wherein the energy dissipation refers to the energy per unit volume of crude oil to be treatedthe amount dissipates.
The comprehensive treatment method for improving the fluidity of the crude oil by using the electric field and stirring comprises the steps of applying the electric field with certain strength to the crude oil, stirring the electric field modified crude oil at a low temperature according to certain energy dissipation, or firstly stirring the crude oil at a low temperature according to certain energy dissipation, and then applying the electric field with certain strength to the stirred crude oil, so as to reduce the viscosity of the crude oil and improve the fluidity of the crude oil. Among them, application of an electric field of a certain intensity and stirring are necessary for improving fluidity of a liquid having good insulation properties such as crude oil to produce a viscosity reducing effect. The method has important significance for pipeline transportation of crude oil needing viscosity reduction, and more particularly provides an important method with low energy consumption for pipeline transportation of crude oil in long distance, and the method can prevent the problems of increased fluid viscosity and obviously increased energy consumption caused by temperature reduction in the fluid transportation process.
in order to obtain a durable viscosity-reducing effect, an electric field with a certain intensity is applied, and then the fluid is stirred at a proper speed. For example, in a preferred embodiment of the invention, the electric field strength may be applied in the range of about 0.4kV/mm to about 1.5kV/mm, the electric field may be applied for a time in the range of about 30s to about 120s, and the average shear rate of the agitation may be about 150s-1To about 2000s-1Within the range of (1), the stirring time may be within the range of about 200s to about 600 s. The selection of a particular value within this range can be selected based on the type of fluid being tested, the desired degree of viscosity reduction, and the temperature of the fluid. It goes without saying that if the applied electric field strength is too low, the stirring rate is too low, and the stirring time is too short, the result will be one of no significant change in viscosity, or a shorter duration of the viscosity reducing effect.
As indicated above, it is important to apply electric field strength, stirring rate and stirring time to the fluid, so that the stirring rate and stirring time are combined together in terms of energy dissipation, and the viscosity of the fluid itself at the time of stirring is introduced, thereby measuring the stirring effect.
In the method provided by the invention, after the crude oil treated by the electric field is subjected to the same energy dissipation stirring action, the viscosity reducing effect is the same, and thus, a basis is provided for the prediction and simulation of the crude oil viscosity improving effect.
According to the method provided by the invention, after an electric field with certain intensity is applied to the experimental fluid and stirring is carried out, particles such as wax crystals in the experimental fluid are aggregated, and the polydispersity of the system is increased. Once the crude oil is separated from the electric field and stirred, the particles in the crude oil are gradually dispersed, the ordered distribution of the particles is disturbed, the viscosity rebounds to the initial value along with the increase of time, and the time is taken for the viscosity to rebound to the initial value for more than 60 hours.
According to the method of the present invention, the electric field can be a high voltage direct current electric field or a low frequency pulse electric field. When a pulsed electric field is applied, the interval is in the range of 1s to 60s, for example, the pulse voltage interval time is 15 s. The direction of the electric field is not limited to the flow direction of the fluid, and may be selected according to different fluids, and the direction of the electric field loading may be parallel to the flow direction of the fluid or may form an angle, for example, opposite to the flow direction.
According to the method of the present invention, the strength and duration of the electric field to which the test fluid is subjected depends on the type of fluid, e.g., waxy crude oil, heavy oil, mixed crude oil, etc. It has been determined that the greater the viscosity of the fluid prior to the integrated treatment, the greater the viscosity reduction after the electric field modification, agitation.
according to the process of the invention, in a preferred embodiment of the invention, after the crude oil has passed through the electric field generated between the electrodes, typically 2 to 5 electrodes are required, ensuring the generation of 1 to 4 electric fields, and the fluid is stirred by means of a coaxial cylindrical stirring system. The crude oil can contact with the electrode, pass through the electrode plate with the hole, and form an included angle with the direction of the fluid like the direction of the loading electric field, and is not directly contacted with the fluid; the stirring process uses a coaxial cylindrical rotor and a coaxial cylindrical drum.
In order to realize the modification of the fluidity of crude oil at low temperature and have a lasting viscosity-reducing effect, the invention provides a novel method for improving the fluidity of oil products by stirring high-viscosity crude oil after the modification of the crude oil by an electric field. The method provided by the invention has low energy consumption, can obviously reduce the viscosity of the oil product, can predict the viscosity reduction effect, maintains the viscosity reduction effect for a long time, and can improve the flowing capability of the oil product at low temperature.
Drawings
FIG. 1 is a schematic process flow diagram of an integrated process for improving the fluidity of crude oil using an electric field and agitation according to an embodiment of the present invention;
FIG. 2 is a graph showing the relationship between the viscosity of the waxy crude oil obtained in example 1 of the present invention (18 ℃ C.) as a function of time after the treatment by electric field and stirring and after the treatment by electric field and pour point depressant;
FIG. 3 is a graph showing the viscosity reduction rate of waxy crude oil according to the present invention (18 ℃ C.) as a function of shear rate at different stirring times, according to example 2;
FIG. 4 is a graph of the viscosity reduction rate of waxy crude oil provided in example 2 of the present invention as a function of energy dissipation per unit volume (18 deg.C) under combined electric field and agitation.
Detailed Description
In order to clearly understand the technical features, objects and advantages of the present invention, the following detailed description of the technical solutions of the present invention will be made with reference to the following specific examples, which should not be construed as limiting the implementable scope of the present invention.
Example 1
This example provides an integrated process for improving the fluidity of crude oil (waxy crude oil) using electric field and agitation, which is schematically shown in FIG. 1, and comprises the following steps:
Selecting 400g of crude oil containing wax (the wax content is 10.8 wt%, and the relative dielectric constant is 2.0), wherein the condensation point is 14 ℃ (wax precipitation point is 37 ℃); when the temperature of the oil product is 18 ℃, an electric field with the strength of 0.8kV/mm is applied to the oil product for treating for 90s to obtain an oil product A;
Then the oil A is stirred, and the average shear rate of the stirring is 250s-1The stirring time is 500s, the stirred oil product B is obtained, and the corresponding energy dissipation per unit volume is 21.94 multiplied by 105J/m3。
then transferring the oil B to a HAAKE RS150 rotational rheometer to test the oil at the temperature of 18 ℃, wherein the oil is kept at constant temperature for 10s-1Viscosity at room temperature. Thereby obtaining the viscosity of the oil product after comprehensive modification,The results are shown in FIG. 2 and Table 1. Wherein, the viscosity reduction rate calculation formula is shown as formula 1.
In formula 1, epsilon represents the viscosity reduction rate,%; eta0Is the viscosity of the oil without any treatment, mPas; eta1Is the viscosity of the oil product, mPas, after the modification and the stirring by an electric field.
comparative example 1
this comparative example provides an integrated treatment process for depressing the pour point and reducing the viscosity of a waxy crude oil (the process disclosed in CN 107435816A) comprising the steps of:
Selecting 400g of crude oil containing wax (the wax content is 10.8 wt%, and the relative dielectric constant is 2.0), wherein the condensation point is 14 ℃ (wax precipitation point is 37 ℃); selecting a pour point depressant (ethylene-vinyl acetate copolymer, EVA) and adding the pour point depressant into the waxy crude oil at room temperature (26 ℃), wherein the mass concentration of the pour point depressant is 1 percent, and adding 0.7g (the additive concentration is 70ppm) of the pour point depressant to obtain an additive oil product A;
After heat treatment at 60 ℃ for 1h, the condensation point of the additive oil product A is 8 ℃, the wax precipitation point is still 40 ℃, and after the temperature is reduced to the required temperature of 18 ℃, the stirring time is 3min, and the stirring speed is 21000rpm, so that an oil product B after high-speed shearing and stirring is obtained;
And then applying an electric field with the strength of 0.8kV/mm to the oil product B for 90s to obtain the treated crude oil.
The viscosity of the treated crude oil was measured at constant temperature for various times in the same manner as in example 1 and the viscosity reducing ratio was calculated according to the above formula 1. The results of comparison are shown in FIG. 2 and Table 1.
TABLE 1
As can be seen from figure 2 and table 1,Treating the untreated oil sample for 90s in an electric field with the strength of 0.8kV/mm at the temperature of 18 ℃ to obtain an oil product A, and treating the oil product A for 250s-1stirring for 500s to obtain an oil product B, wherein at the time (0h) of just treatment, the viscosity of the oil product is 62.85mPa & s, the viscosity reduction rate reaches 59.75%, and the viscosity reduction rate of the oil product treated by the treatment method of the embodiment 1 of the invention is nearly doubled (31.10% of viscosity reduction rate) compared with the viscosity reduction rate of the oil product treated by the electric field and pour point depressant comprehensive treatment method of the comparative example 1 under the same conditions, so that the crude oil added with the pour point depressant in the comparative example 1 has poor modification effect after undergoing high shear, and the treatment method provided by the invention can further improve the viscosity reduction effect of the crude oil after stirring; and the viscosity of the oil after comprehensive treatment gradually rises along with the increase of time, and when the viscosity rises to 151.95mPa & s after 60h of comprehensive treatment, the viscosity of the oil is still lower than that of the untreated oil, which shows that the treatment method provided by the invention still has a certain viscosity reduction effect, and compared with the comprehensive treatment of an electric field and a pour point depressant under the same condition, the viscosity reduction effect can only maintain 32h of action, and the method provided by the invention can maintain longer improvement time. Therefore, the invention achieves the viscosity reducing effect, and the viscosity reducing effect has long timeliness.
Example 2
This example provides an integrated process for improving the fluidity of crude oil (waxy crude oil) using electric field and agitation, which is schematically shown in FIG. 1, and comprises the following steps:
selecting 400g of crude oil containing wax (the wax content is 10.8 wt%, and the relative dielectric constant is 2.0), wherein the condensation point is 14 ℃ (wax precipitation point is 37 ℃); when the temperature of the oil product is 18 ℃, an electric field with the strength of 0.8kV/mm is applied to the oil product for treating for 90s to obtain an oil product A;
Then the oil A is stirred, and the average shear rate of the stirring is 150s-1To 2000s-1And the stirring time is 300s and 500s respectively, so as to obtain the oil product B after stirring.
Then transferring the oil B to a HAAKE RS150 rotational rheometer to test the oil at the temperature of 18 ℃, and after stirring with different strengths, testing the oil for 10s-1(shear rate of the instrument when tested). Wherein,The viscosity of the untreated oil was 154.01 mPas, from which the viscosity reduction of the overall modified oil was obtained, and the results are shown in FIG. 3. Wherein, the viscosity reduction rate calculation formula is shown as the above formula 1.
the different stirring times and stirring intensities are quantitatively described in terms of energy dissipation. Wherein, the calculation formula of energy dissipation per unit volume is shown as formula 2.
In the formula 2, phi is the energy dissipation per unit volume, J/m3；For stirring the average shear rate, s-1(ii) a Mu is the viscosity of the oil product during stirring, mPa & s; t is the stirring time, s.
TABLE 2
As can be seen from FIG. 3 and Table 2, the untreated oil sample was treated in an electric field of 0.8kV/mm strength for 90 seconds at 18 ℃ to obtain oil A, and the oil A was stirred at different strengths to obtain oil B. Along with the improvement of the energy dissipation of stirring, the viscosity reducing effect of the oil product is better and better. And when the energy dissipation of stirring is the same, the viscosity reducing effect is also the same. E.g. at 250s-1The energy dissipation per unit volume of stirring 300s is 12.32 x 105J/m3It is close to 150s-1the energy dissipation per unit volume of stirring for 500s is 12.06X 105J/m3While the viscosity reduction rate of the former is 57.15%, which is also close to the viscosity reduction rate of 56.99% of the latter, in other different stirring strengths and stirring times, the rule is also consistent: i.e. the energy dissipation is the same and the viscosity reduction rate is the same. Thus the viscosity reduction rate for different unit volumes of energy dissipation can be obtained using the treatment method provided by the present invention, see table 3 and figure 4.
TABLE 3
Therefore, a prediction basis is provided for the viscosity reducing effect of different stirring strengths and stirring times; meanwhile, a means is provided for simulating short-time and high-speed stirring of petroleum passing through a pump of the petroleum pipeline by long-time and low-speed stirring, so that the method provided by the invention has important significance for modified crude oil transportation.
Claims (10)
1. an integrated process for improving the flow of crude oil using an electric field and agitation, the process comprising the steps of:
Firstly, applying an electric field with certain strength to the crude oil to obtain a modified oil product; stirring the modified oil product according to certain energy dissipation to obtain an oil product after comprehensive treatment;
or, firstly, stirring the crude oil according to certain energy dissipation to obtain a modified oil product; then applying an electric field with certain strength to the modified oil product to obtain an oil product after comprehensive treatment;
the average shear rate of the stirring was 150s-1To 2000s-1The stirring temperature is between the condensation point and the wax precipitation point of the crude oil, and the stirring time is 200s to 600 s;
The energy dissipation is 4.70 x 105-631.80×105J/m3。
2. Method according to claim 1, characterized in that it comprises the following steps: firstly, applying an electric field with certain strength to the crude oil to obtain a modified oil product; and stirring the modified oil product according to certain energy dissipation to obtain the oil product after comprehensive treatment.
3. The method of claim 1 or 2, wherein the crude oil comprises waxy crude oil, heavy oil, and blends thereof.
4. the method of claim 3, wherein the crude oil is a waxy crude oil.
5. The method of claim 4, wherein the waxy crude oil has a wax content of greater than 2.5 wt% and a relative dielectric constant of 1.8 to 2.7.
6. The method according to claim 1 or 2, wherein the electric field is a direct current electric field or a pulsed electric field having an electric field strength of 0.1kV/mm to 2.0 kV/mm.
7. The method of claim 6, wherein the electric field strength is 0.4kV/mm to 1.5 kV/mm.
8. The method of claim 6, wherein the electric field is applied for a time of 30s to 120 s.
9. the method of claim 6, wherein the pulsed electric field is separated by a time interval of 1s to 60 s.
10. The method of claim 6, wherein the number of electric fields is 1 to 4.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101084397A (en) * | 2004-12-15 | 2007-12-05 | 坦普尔大学-高等教育联盟 | Method for reduction of crude oil viscosity |
| CN101725832A (en) * | 2008-10-15 | 2010-06-09 | 中国海洋石油总公司 | Method for reducing viscosity of crude oil |
| CN205662492U (en) * | 2016-05-26 | 2016-10-26 | 中国石油大学(北京) | A device for improving liquid flow mobility |
| CN107435816A (en) * | 2016-05-26 | 2017-12-05 | 中国石油大学(北京) | It is a kind of to make easily to coagulate the glutinous integrated conduct method of high tack coat product pour point depression drop |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101084397A (en) * | 2004-12-15 | 2007-12-05 | 坦普尔大学-高等教育联盟 | Method for reduction of crude oil viscosity |
| CN101725832A (en) * | 2008-10-15 | 2010-06-09 | 中国海洋石油总公司 | Method for reducing viscosity of crude oil |
| CN205662492U (en) * | 2016-05-26 | 2016-10-26 | 中国石油大学(北京) | A device for improving liquid flow mobility |
| CN107435816A (en) * | 2016-05-26 | 2017-12-05 | 中国石油大学(北京) | It is a kind of to make easily to coagulate the glutinous integrated conduct method of high tack coat product pour point depression drop |
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