CN114778605A - Asphalt electrical property testing device, testing system and testing method thereof - Google Patents
Asphalt electrical property testing device, testing system and testing method thereof Download PDFInfo
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- CN114778605A CN114778605A CN202210478782.4A CN202210478782A CN114778605A CN 114778605 A CN114778605 A CN 114778605A CN 202210478782 A CN202210478782 A CN 202210478782A CN 114778605 A CN114778605 A CN 114778605A
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Classifications
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- G—PHYSICS
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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
- G01N1/38—Diluting, dispersing or mixing samples
Abstract
The invention provides an asphalt electrical property testing device, an asphalt electrical property testing system and an asphalt electrical property testing method, and relates to the technical field of petrochemical industry. It includes: the electric test container and set up the top cap in electric test container top, be provided with polar plate, dead lever in the cavity in the electric test container, the polar plate is fixed with the dead lever, and the one end that the polar plate was kept away from to the dead lever is extended outward by the inside top cap of electric test container, and dead lever and top cap fixed connection. The device can simply and accurately test the electrical property of the asphalt, and the testing device provided by the invention has the advantages of simple structure, simple and convenient operation and easy operation. When the testing device provided by the invention is used for testing the electrical property of asphalt, the needed object to be tested is less in dosage, and the testing result is accurate.
Description
Technical Field
The invention relates to the field of petrochemical industry, in particular to an asphalt electrical property testing device, an asphalt electrical property testing system and an asphalt electrical property testing method.
Background
The asphalt present in petroleum has a significant impact on the exploitation, storage and transportation and secondary processing of petroleum. Deposition of asphaltenes in the reservoir can result in plugging of pore throats, reduction of reservoir permeability space, and reduction of recovery. The deposition of asphaltenes in a reservoir is an irreversible process, and the asphaltenes are difficult to remove by using a solvent and are extremely easy to cause permanent damage to the reservoir. The presence of asphaltenes in petroleum oils also has varying degrees of influence on the process of crude oil transportation. The asphaltene content in crude oil directly affects the viscosity of the oil and reduces the transport rate. Although the use of heat or dispersant pretreatment can reduce the viscosity, it is accompanied by a large energy loss. In addition, the pipeline transportation process is often accompanied by changes of external conditions such as changes of pressure, temperature, formation of flowing potential and the like, and the changes of the conditions can also cause the crude oil to lose the original balance state to precipitate asphaltene, generate accumulation in the pipeline, reduce the transportation efficiency of the pipeline and even cause the blockage of the pipeline. Bitumen also has a significant impact on current heavy oil processing. The polar components such as colloid and asphaltene in the heavy oil are difficult to decompose and have high metal content, so that the development of the heavy oil processing technology is influenced.
In view of the adverse effects of the presence of asphaltenes in crude oil on petroleum processing, there is a need for an in-depth understanding of the basic physicochemical properties of asphaltenes, such as structure and composition, in developing corresponding countermeasures. A great deal of research has suggested that the colloids and asphaltenes in crude oil exist in the residual oil in a colloidal form and are in dynamic equilibrium with the components of the residual oil. It is also believed that the ionic functional groups in the asphaltene molecules can cause some of the asphaltenes to be present in the processed oil in ionized form. Both views suggest that asphaltenes possess charged characteristics within the system and can affect the stability of heavy oil colloid systems. Therefore, the study on the charged characteristics of the asphalt can further enrich the understanding of a heavy oil colloid system and provide theoretical support for the development of a heavy oil processing technology.
Currently, the commonly used asphalt electrification property research methods include a surface electromotive force measurement method and a conductivity measurement method.
The surface electromotive force measuring method mainly adopts water with larger polarity as a dispersion medium to form asphaltene emulsion, and measures the surface electromotive force of the emulsion under different conditions. On one hand, due to adsorption of ions or active agents in the aqueous solution by the asphaltenes, and on the other hand, due to easier ionization of functional groups on the surface of the asphaltenes in polar media, the surfaces of the asphaltenes have electromotive forces under the action of the two charging mechanisms. However, the used asphaltene and the asphalt are different in composition, and the asphalt is analyzed to be composed of the asphaltene, the colloid, the aromatic component and the saturated component according to a four-component method, so that a research object and an adopted medium used in the method have larger difference with the real oil environment. The organic matter is used as a dispersion medium, and the electromotive force formed on the surface of the asphalt emulsion is low, so that the instrument testing accuracy is low, and the problem of inaccurate measurement exists; in addition, the device for measuring the surface electromotive force has high cost and is not beneficial to wide application.
The conductivity measurement method is mainly influenced by factors such as asphalt content in the solution, asphalt aggregation state, medium viscosity and the like, and reflects the overall properties of the asphalt mixture. Through testing, the aggregation state, critical concentration, moving speed and the like of the asphalt can be determined, but the charging characteristics of the asphalt cannot be directly characterized. In addition, the measured value of the conductivity in a nonpolar medium is low, and a part of the conductivity measuring device cannot be directly read, so that the device needs to be improved to measure.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a device, a system and a method for testing the electrical property of asphalt, so that the electrical property of the asphalt can be tested simply and accurately. When the testing device provided by the invention is used for testing the electrical property of asphalt, the needed object to be tested is less in dosage, and the testing result is accurate.
The invention is realized by the following steps:
the invention provides an asphalt electrical property testing device, which comprises: the electric testing device comprises an electric testing container and a top cover arranged above the electric testing container, wherein a polar plate and a fixed rod are arranged in a cavity in the electric testing container, the polar plate is fixed with the fixed rod, one end of the fixed rod, which is far away from the polar plate, extends out of the top cover from the inside of the electric testing container, and the fixed rod is fixedly connected with the top cover;
the number of the polar plates is at least two, the number of the polar plates is even, and the two adjacent polar plates are distributed at intervals; the fixed rod and the polar plate are made of conductive materials.
The electrical property test container is used for holding the pitch that awaits measuring, and the dead lever that conducting material made can introduce external current to the polar plate on the one hand to make the electrified granule in the pitch migrate under the electric field environment, on the other hand plays the effect of fixed top cap and polar plate. In one embodiment, the fixing rod is assembled and disassembled with the top cover.
For example, the fixing rod is a cylindrical binding post or a prismatic binding post. The polar plate and the fixed rod are both made of metal products or materials plated, adhered or coated with metal conducting layers.
In a preferred embodiment of the invention, the top cover is provided with fixing rod mounting holes, and the number of the mounting holes is not less than the number of the fixing rods.
In an optional implementation mode, the top cap is the apron, and the design has a plurality of equidistance mounting holes, adjusts the polar plate interval according to the distance of mounting hole on the one hand, and on the other hand these mounting hole holes have guaranteed that the inside normal atmospheric temperature of electrical test container is the state. The top cover is made of insulating materials.
The polar plate fixing device uses an insulating material with a screw structure, and the fixing rod, the polar plate and the top cover are assembled together through the mounting hole of the cover plate. Polar plate fixing device installs both sides about the dead lever, can adjust the degree of depth of polar plate in the test tank to play fixed effect to the polar plate.
In an alternative embodiment, the number of mounting holes is greater than the number of fixing bars; this facilitates adjustment of the position of the mounting plate.
In an alternative embodiment, the number of mounting holes is twice the number of fixing bars.
In the preferred embodiment of the present invention, one plate is fixed on every two fixing rods, and in other embodiments, 1 plate can be fixed on 1 fixing rod.
In an alternative embodiment, two adjacent pole plates are arranged in parallel, for example perpendicular to the cover plate.
In a preferred embodiment of the present invention, the cap is detachably connected to the electrical testing container.
In an alternative embodiment, the top cover is bolted, snapped or glued to the fastening rod.
The invention also provides an asphalt electrical property testing system which comprises the asphalt electrical property testing device, a power supply unit and a lead.
In a preferred embodiment of the invention, a fixing column extending from a top cover of the asphalt electrical property testing device is electrically connected with the power supply unit through a lead;
in an alternative embodiment, the plurality of fixing posts are respectively electrically connected to the anode and the cathode of the power supply unit through wires.
The invention also provides a method for testing the asphalt electrical property by adopting the asphalt electrical property testing device, which comprises the following steps: placing an asphalt mixture formed by mixing asphalt to be tested and an organic solvent in an electrical property testing container of an asphalt electrical property testing device, applying direct current to a fixed rod, and judging the electrification of the tested asphalt according to the asphalt deposition condition on a polar plate of the asphalt electrical property testing device;
if only the anode plate has asphalt deposition, judging that the tested asphalt is negatively charged; and the content of the negatively charged asphalt is 100 percent.
If only the polar plate of the cathode has asphalt deposition, judging that the tested asphalt is positively charged; and the content of the positively charged asphalt is 100 percent.
If the polar plates positioned at the anode and the cathode have asphalt deposition, judging that one part of the tested asphalt is positively charged and the other part of the tested asphalt is negatively charged; and calculating the proportion of the positively charged asphalt to the negatively charged asphalt to be detected according to the mass of the asphalt deposited on the polar plates of the anode and the cathode.
Under the action of an external electric field, asphalt particles show electrification and move and adsorb to polar plates with opposite electric properties.
In a preferred embodiment of the present invention, the particle size of the asphalt to be measured is less than 100 mesh. If the particle size of the asphalt is too large, the asphalt cannot be suspended in the solvent under the action of gravity, and the asphalt can be directly deposited to the bottom of the test pool in a short time.
In other embodiments, the mixed solution may be suspended by vortexing or magnetic bar stirring, so that the asphalt may be tested directly without grinding, and the particle size of the asphalt may exceed 100 mesh.
The test process is carried out under the conditions of normal pressure and normal temperature. When the temperature is too high, the solvent is easily volatilized, and when the temperature is too low, the operation is not facilitated.
In an alternative embodiment, the organic solvent is selected from at least one of heptane, hexane, pentane, petroleum ether, acetone, isopropanol, white oil.
In other embodiments, solvents that are less soluble in bitumen are also possible.
In an alternative embodiment, the organic solvent is selected from a mixed solvent of heptane and white oil;
in an alternative embodiment, the preparation of the bituminous mixture is achieved by means of sonication, magnetic stirring or stirrer stirring. On the one hand, the polymerization of the asphalt particles itself is prevented and the particle size is increased, and on the other hand, the asphalt particles are uniformly dispersed in the solvent.
In an alternative embodiment, the concentration of the bituminous mixture is less than 1g/L, and in an alternative embodiment, less than 0.25 g/L. The asphalt concentration is high, and the asphalt can be settled during preparation; the concentration is within the above range, and the concentration is kept at a low level, and the asphalt is dispersed better and less likely to settle.
In the preferred embodiment of the present invention, the test time for applying electricity is t, 0< t <5min, in the preferred embodiment of the present invention, 0< t <3min, in the preferred embodiment of the present invention, 1< t <2 min;
in the preferred embodiment of the present invention, the test voltage of the applied electricity is V, and in the preferred embodiment of the present invention, 0< V < 10000V; in the preferred embodiment of the invention, 1000< V < 6000V;
in the preferred embodiment of the present invention, the electric field strength of the applied electricity is E, and in the preferred embodiment of the present invention, 0< E < 10000V/cm; in the preferred embodiment of the invention, 1000< E < 6000V/cm.
In the preferred embodiment of the invention, the quality of the pitch deposited on the plates of the anode and cathode is obtained by:
and (4) powering off, taking out the polar plate, weighing, and judging the content of the asphalt with different electrical properties in the asphalt to be tested according to the mass difference of the asphalt deposited on the polar plate before and after the test.
Compared with the prior art, the invention has the beneficial effects that:
mixing asphalt and a solvent to form an asphalt mixture, and applying an electric field to enable the asphalt with electropositivity to be adsorbed on one side of a cathode and the asphalt with electronegativity to be adsorbed on one side of an anode; the electrification of the asphalt is characterized by the adsorption condition on the polar plate. The asphalt electrical property testing device is simple in structure, simple and convenient to operate and easy to operate. When the testing device provided by the invention is used for testing the electrical property of asphalt, the needed object to be tested is less in dosage, and the testing result is accurate.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a schematic flow chart of an electrical property test of asphalt;
FIG. 2 is a diagram of an experimental setup for asphalt electrical testing;
FIG. 3 is a schematic view of a test cell of the electrical testing apparatus;
FIG. 4 is a schematic view and a cross-sectional view of a plate holder.
Icon: 1-a binding post; 2-a polar plate fixing device; 3-pole plate; 4-cover plate; 5-cover plate small holes; 6-a test pool; 7-power supply unit and wire.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention usually place when in use, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "suspended" and the like do not imply that the components are absolutely horizontal or suspended, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Example 1
Referring to fig. 1 and 2, fig. 1 is a schematic flow chart of asphalt electrical property test. FIG. 2 is a diagram of an experimental setup for asphalt electrical testing.
The embodiment specifically provides a device and a method for testing the electrical property of asphalt.
The four-component determination was performed on the asphalt to be tested in the examples, with the following results: gum 3.37%, fragrance 4.04%, C7Asphaltene 90.57%, yield 97.98%, and no saturates.
The bitumen concentration is the mass of bitumen per volume of the bitumen mixture in g/L.
In this example, a mixed reagent of white oil and heptane, heptane: the volume ratio of the white oil is 1: 1.
the device for testing the electrical property of the asphalt comprises an electrical property testing container (namely, a testing tank 6) and a top cover (namely, a cover plate 4) arranged above the electrical property testing container, wherein a polar plate 3 and a binding post 1 are arranged in a cavity in the electrical property testing container, and the polar plate 3 and the binding post 1 are fixedly connected, namely welded in the embodiment. One end of the binding post 1, which is far away from the pole plate 3, extends out of the cover plate 4 from the inside of the test pool 6, and the binding post 1 and the cover plate 4 are fixedly connected through the pole plate fixing device 2. The cover plate 4 is uniformly provided with 8 cover plate small holes 5 for passing through the terminals 1 (see fig. 3 and 4).
The binding post 1 is electrically connected with an external power supply unit and a lead 7.
The test method is as follows:
(1) the asphalt to be tested is fully ground and filtered by a 100 mesh filter screen to ensure that the particle size of the formed asphalt mixture is less than 100 meshes.
(2) The filtered asphalt particles were mixed with a solvent and treated with ultrasonic waves for 30min to uniformly disperse asphalt in the solvent to prepare an asphalt mixture of 0.25 g/L.
(3) The prepared asphalt mixture was transferred to the test cell 6, and applied with electricity at an electric field strength of 6000V/cm for 1 min.
(4) During the charging process, asphalt particles move and are adsorbed to one side of the cathode through the outer side of the charging cell, the asphalt mixture on one side of the cathode becomes clear, and the asphalt mixture on one side of the anode is uniform and has no phenomenon. After the external electric field is removed and the polar plate 3 is taken out, the asphalt is only adsorbed on one side of the cathode.
The bitumen in this example is therefore electropositive.
Example 2
The asphalt mixture prepared in example 1 was transferred to the test cell 6, and applied with electricity at an electric field strength of 9000V/cm for 1 min.
During the power-up process, a part of asphalt particles move and adsorb to the cathode and a part of asphalt particles move and adsorb to the anode through the outer side of the power-up cell. After the external electric field is removed and the polar plates 3 are taken out, the asphalt is adsorbed on the polar plates 3 on the two sides. Thus, in this example, a portion of the pitch is positively charged and a portion of the pitch is negatively charged.
Experimental example 1
When the asphaltene concentration is 0.25g/L, the testing time is 2min, and the testing voltage is 6000V, the electrical property test is respectively carried out on the sample asphaltene 1, the asphaltene 2 and the asphaltene 3, and the results are as follows:
1, asphaltene 1:
the weight of the anode plate is increased by 20mg, and the weight of the cathode plate is increased by 15mg, so that the proportion of the negatively charged asphaltene in the raw material is 20/(20+15) to 57.14%, and the proportion of the positively charged asphaltene in the raw material is 42.86%.
And asphaltene 2:
under the same test conditions, only the deposition of asphaltenes on the anode plate was observed, whereas the cathode plate had no deposition of asphaltenes, thus judging that asphaltenes 2 were positively charged.
③ asphaltenes 3:
under the same test conditions, only the cathode plate was observed to have asphaltene deposition, while the anode plate had no asphaltene deposition, thus judging that asphaltene 3 was negatively charged.
In summary, the method for testing the electrical property of the asphalt comprises the following steps: 1. fully grinding the asphalt to be detected, and filtering by using a 100-mesh filter screen to ensure that the particle size of the asphalt is less than 100 meshes. 2. Adding the asphalt into a mixed solvent of white oil and heptane, and performing ultrasonic treatment to uniformly disperse the asphalt in the solvent. 3. The prepared asphalt mixture is transferred into a test cell 6, and is processed for a certain time under a certain electric field intensity, so that asphalt is adsorbed on the polar plate 3, positively charged asphalt is adsorbed on the cathode, and negatively charged asphalt is adsorbed on the anode. 4. Removing the external electric field, weighing, observing the movement rule of the asphalt particles on the outer side, and judging the electrification of the asphalt and the content of the asphalt with different electric properties through the adsorption condition on the polar plate 3.
The present invention has been described in terms of the preferred embodiment, and it is not intended to be limited to the embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An asphalt electrical property testing device, characterized in that, it includes: the electric testing device comprises an electric testing container and a top cover arranged above the electric testing container, wherein a cavity in the electric testing container is internally provided with a polar plate and a fixed rod, the polar plate is fixed with the fixed rod, one end of the fixed rod, which is far away from the polar plate, extends out of the top cover from the inside of the electric testing container, and the fixed rod is fixedly connected with the top cover;
the number of the polar plates is at least two, the number of the polar plates is even, and two adjacent polar plates are distributed at intervals; the fixing rod and the polar plate are made of conductive materials.
2. The asphalt electrical property testing device of claim 1, wherein the top cover is provided with the fixing rod mounting holes, and the number of the mounting holes is not less than the number of the fixing rods;
preferably, the number of the mounting holes is more than the number of the fixing bars;
preferably, the number of the mounting holes is twice the number of the fixing bars.
3. The asphalt property testing device of claim 1, wherein every two or every 1 of said fixing rods are fixed with one of said pole plates;
preferably, two adjacent polar plates are arranged in parallel.
4. The asphalt electrical property testing device of any one of claims 1-3, wherein the top cover is removably connected to the electrical property testing container;
preferably, the top cover is bolted, clamped or bonded to the fixing rod.
5. An asphalt property testing system, comprising the asphalt property testing apparatus according to any one of claims 1 to 4, a power supply unit, and a lead.
6. The asphalt property testing system of claim 5, wherein a fixing post extending from a top cover of the asphalt property testing device is electrically connected to the power supply unit through the conducting wire;
preferably, the plurality of fixing posts are electrically connected with the anode and the cathode of the power supply unit through the conducting wires respectively.
7. A method for asphalt electrical property test using the asphalt electrical property test apparatus according to any one of claims 1 to 4, comprising: placing an asphalt mixture formed by mixing asphalt to be tested and an organic solvent into an electrical property testing container of an asphalt electrical property testing device, and applying direct current to a fixed rod; judging the electrification of the tested asphalt according to the asphalt deposition condition on a polar plate of the asphalt electrical property testing device;
if only the anode plate has asphalt deposition, judging that the tested asphalt is negatively charged;
if only the polar plate of the cathode has pitch deposition, judging that the tested pitch is positively charged;
if the polar plates positioned on the anode and the cathode have asphalt deposition, judging that one part of the tested asphalt is positively charged and the other part of the tested asphalt is negatively charged; and calculating the proportion of the positively charged asphalt to the negatively charged asphalt to be detected according to the mass of the asphalt deposited on the polar plates of the anode and the cathode.
8. The method according to claim 7, wherein the particle size of the asphalt to be tested is less than 100 meshes;
preferably, the organic solvent is selected from at least one of heptane, hexane, pentane, petroleum ether, acetone, isopropanol, white oil;
preferably, the organic solvent is selected from a mixed solvent of heptane and white oil;
preferably, the preparation of the asphalt mixture is realized by adopting an ultrasonic treatment mode, a magneton stirring mode or a stirrer stirring mode;
preferably, the concentration of the bituminous mixture is less than 1g/L, preferably less than 0.25 g/L.
9. The method according to claim 7, wherein the test time for applying electricity is t, 0< t <5min, preferably 0< t <3min, more preferably 1< t <2 min;
preferably, the test voltage of the applied electricity is V, preferably 0< V < 10000V; more preferably, 1000< V < 6000V;
preferably, the electric field strength of the applied electricity is E, preferably 0< E < 10000V/cm; more preferably, 1000< E < 6000V/cm.
10. The method of claim 7, wherein the quality of pitch deposited on the anode and cathode plates is obtained by:
and (4) powering off, taking out the polar plate, weighing, and judging the contents of the asphalts with different electrical properties in the asphalt to be tested according to the mass difference of the asphalt deposited on the polar plate before and after the test.
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| CN1629257A (en) * | 2003-12-18 | 2005-06-22 | 石油大学(北京) | Ion liquid solvent for dissolving and removing asphaltene deposit and preparing method thereof, and method for removing asphaltene and regeneration method of the ion liquid solvent |
| JP2005219046A (en) * | 2004-01-09 | 2005-08-18 | Air Water Inc | Method and apparatus for controlling liquid quantity of solution |
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