Strong-permeability instant asphaltene dispersing and unblocking composition and application thereof

Abstract

The invention provides a strong-permeability instant asphaltene dispersing and unblocking composition and application thereof. The dispersion blocking removal composition comprises a penetrating agent, a dispersing agent, a polymerization inhibition stabilizer and a solvent, wherein the polymerization inhibition stabilizer is a polymer containing an aromatic ring structure and an alkyl long side chain structure. The dispersing and unblocking composition has a good dispersing and dissolving effect on asphaltene deposition blocking, the preparation method of the dispersing and unblocking composition is simple, easy to operate, small in dosage, low in cost and harmless to downstream refining and chemical processes, does not affect subsequent crude oil dehydration and water treatment of a system, and is suitable for industrial production and field application.

Description

Technical Field

[0001] This invention belongs to the field of oilfield chemical additives technology, and particularly relates to a highly penetrating and rapidly soluble asphaltene dispersion and unblocking composition and its application. Background Technology

[0002] Asphaltenes, often referred to as the cholesterol of crude oil, are composed of several unit plates. Each unit plate has a fused aromatic core surrounded by multiple cycloalkane rings and heterocycles, and is further bound by alkyl side chains or heteroatom-containing side chains of varying numbers. Metals such as iron, vanadium, and nickel are also complexed within the molecule. These unit plates associate with each other through intermolecular forces such as hydrogen bonds, π-π interactions, dipole-dipole interactions, acid-base interactions, and metal coordination interactions, forming micelles. These micelles then aggregate into more complex supramolecular structures—the associative structures of asphaltenes. During heavy oil extraction, changes in reservoir fluid composition, temperature, and pressure disrupt the phase equilibrium of the crude oil system, causing asphaltenes to precipitate and deposit. The flocculation and deposition of asphaltenes reduce rock permeability and reverse wettability, resulting in permanent reservoir damage. It can also clog peripheral equipment such as well casings and separators, severely reducing production efficiency.

[0003] Currently, commonly used methods for removing asphalt deposits include reducing shear force and pressure drop, periodic pipe scraping, solvent treatment, and dispersant injection. Among these, dispersant injection has become an effective way to solve asphalt blockage problems due to its good dispersing effect, construction safety, and environmental friendliness. However, existing dispersants suffer from poor universality, low asphalt dissolution rate, low dissolution efficiency, poor resistance to high temperatures and high salinity, and poor safety (e.g., low flash point, flammability, strong odor). They are not suitable for the special environment of high-temperature and high-pressure oil wells in the Tarim Oilfield and Shunbei Oil and Gas Field, where temperatures range from 100-160℃ and pressures from 60-90MPa, often resulting in asphalt precipitation and well blockage. No corresponding technical solution has yet been found to address these problems. Therefore, developing an asphalt dispersant suitable for high-temperature and high-pressure oil wells, with high safety and environmental performance and a high dissolution rate is of great significance. Summary of the Invention

[0004] This invention provides a dispersing and unblocking composition comprising a penetrant, a dispersant, a polymerization inhibitor and stabilizer, and a solvent;

[0005] The polymerization inhibitor stabilizer is a polymer containing an aromatic ring structure and a long alkyl side chain structure.

[0006] In one specific embodiment of the present invention, the aromatic ring structure is any one of aniline, naphthylamine, and aminobenzimidazole; and / or

[0007] The alkyl long side chain structure is C 18 Straight-chain alkyl groups;

[0008] Preferably, the aromatic ring structure is naphthylamine.

[0009] In one specific embodiment of the present invention, the mass of the dispersing and unblocking composition is 100%, the amount of the penetrant is 15 to 20 wt%, the amount of the dispersant is 5 to 9 wt%, the amount of the polymerization inhibitor stabilizer is 3 to 5 wt%, and the amount of the solvent is 70 to 75 wt%.

[0010] In one specific embodiment of the present invention, the polymerization inhibitor is at least one of polymers whose structural diagrams are shown as those of Formula I, Formula II and Formula III;

[0011]

[0012] Where m and n represent the number of single-unit cells; the ratio of m to n is 10:9;

[0013] Preferably, the weight-average molecular weight of the polymerization inhibitor is between 7175 and 12850.

[0014] In this invention, the polymer shown in Formula I is a polymerization inhibitor stabilizer PMV-A-18 with a weight-average molecular weight of 7175, purchased from East China University of Science and Technology Huachang Polymer Co., Ltd.; the polymer shown in Formula II is a polymerization inhibitor stabilizer PMV-N-18 with a weight-average molecular weight of 12850, purchased from East China University of Science and Technology Huachang Polymer Co., Ltd.; and the polymer shown in Formula III is a polymerization inhibitor stabilizer PMV-B-18 with a weight-average molecular weight of 11930, purchased from East China University of Science and Technology Huachang Polymer Co., Ltd.

[0015] In one specific embodiment of the present invention, the penetrant is a small molecule compound containing a cyclic structure and having isomers.

[0016] In one specific embodiment of the present invention, the penetrant is selected from at least one of azobenzene, 2,4-diamine azobenzene, 1,3-diazoaminodiphenyl, p-aminoazobenzene, p-hydroxyazobenzene, 4,4'-dihydroxyazobenzene, 3,3'-dihydroxyazobenzene, 4-phenylazobenzene, dipentene, and 4-isopropenyltoluene.

[0017] In one specific embodiment of the present invention, the dispersant is a polyetheramine and / or N-methylpyrrolidone;

[0018] Preferably, the polyetheramine has a molecular weight of 1000 to 1500.

[0019] In one specific embodiment of the present invention, the solvent is an aromatic hydrocarbon-rich distillate oil.

[0020] In one specific embodiment of the present invention, the aromatic-rich distillate oil is at least one of the distillate oils obtained in the 180 to 350°C distillation range of a refinery diesel catalytic hydrotreating unit.

[0021] Preferably, the aromatic-rich distillate is at least one of the distillate oils obtained in the 280 to 350°C distillation range of a refinery diesel catalytic hydrotreating unit.

[0022] According to a specific embodiment of the present invention, the dispersion unblocking composition is prepared by the following method:

[0023] The penetrant, dispersant, polymerization inhibitor, and solvent are mixed to obtain the dispersion and unblocking composition.

[0024] According to one specific embodiment of the present invention, the mixing conditions are stirring at 30 to 50°C for 1 to 2 hours;

[0025] Preferably, the stirring speed is 1000 to 2000 rpm.

[0026] According to a specific embodiment of the present invention, the penetrant, dispersant, polymerization inhibitor and solvent are mixed and then allowed to stand and cooled to room temperature (25°C) to obtain the dispersion and unblocking composition.

[0027] The application of the dispersing and unblocking composition according to the present invention in the dispersing and unblocking treatment of asphalt deposit blockage.

[0028] The dispersing and unblocking composition provided by this invention can be used for dispersing and unblocking asphalt deposits in oil reservoirs, wellbores, and surface pipelines. Specifically, for asphalt deposit blockages in oil reservoirs, the slug of the dispersing and unblocking composition is injected into the blocked formation through tubing to quench the blockage; for asphalt deposit blockages within the well tubing, the dispersing and unblocking composition is injected into the blocked area of ​​the wellbore through a high-pressure capillary or tubing, allowing it to stand to dissolve and disperse, or it can be circulated using a continuous tubing flushing head; for asphalt deposit blockages in surface pipelines or separation equipment, the dispersing and unblocking composition is pumped to the blocked location using a surface injection device for unblocking.

[0029] The beneficial effects of this invention are:

[0030] To address the problems of existing dispersants, such as poor universality, low asphaltene dissolution rate, low dissolution efficiency, poor resistance to high temperatures and salts, and poor safety (e.g., low flash point, flammability, strong odor), this invention provides a highly penetrating and rapidly dissolving asphaltene dispersing and unblocking composition and its application. The dispersing and unblocking composition includes a penetrant, a dispersant, a polymerization inhibitor / stabilizer, and a solvent. The polymerization inhibitor / stabilizer is a polymer containing an aromatic ring structure and a long alkyl side chain structure.

[0031] Compared with the prior art, this application has the following advantages:

[0032] (1) Through formulation design and structural design of polymerization inhibitor stabilizer, the synergistic effect between penetrant, dispersant and polymerization inhibitor stabilizer is utilized to make the dispersion and unblocking composition have the characteristics of strong penetration and rapid dissolution. The solvent has good compatibility with penetrant, dispersant and polymerization inhibitor stabilizer, which enhances the mixing degree of asphalt blockage with penetrant and dispersant. This has a synergistic effect on the "strong penetration and rapid dissolution" characteristics of the dispersion and unblocking composition, and has a good dispersion and dissolution effect on asphalt blockage. The dispersion and unblocking composition provided by the present invention has a 60-minute dissolution rate of 76.3% to 95.9% for asphalt blockage at 60℃ and a 30-minute dissolution rate of 17.68 to 20.33 mg / mL·min for asphalt blockage. The asphalt blockage has a high dissolution rate and achieves rapid dissolution within 30 minutes. The dispersion and unblocking composition has a good dispersion and dissolution effect on asphalt deposit blockage.

[0033] (2) The preparation method of the dispersion unblocking composition is simple and easy to operate. It only requires stirring and mixing at 30°C to 50°C, which is suitable for industrial production and field application.

[0034] (3) The dispersion and unblocking composition is simple to operate, requires a small amount, has low cost and good economic benefits in the dispersion and unblocking process of asphalt blockages;

[0035] (4) The dispersion unblocking composition has been tested and found to be free of organic chlorine and has no harm to downstream refining processes, that is, it does not affect the subsequent crude oil dehydration and water treatment of the system. Detailed Implementation

[0036] The present invention will be further described below with reference to the embodiments. However, the embodiments of the present invention are merely illustrative examples and should not be construed as limiting the present invention under any circumstances.

[0037] Formulating a dispersible unblocking composition

[0038] The following examples illustrate the preparation of dispersion unblocking compositions, comparative compositions 2 to 5 prepared in comparative examples 2 to 5, and information on the raw materials used in the test examples:

[0039] Azobenzene, 2,4-diamine azobenzene, 1,3-diazoaminodiphenyl, p-aminoazobenzene, p-hydroxyazobenzene, 4,4ˊ-dihydroxyazobenzene, 3,3'-dihydroxyazobenzene, 4-phenylazobenzene: all purchased from Zhengzhou Alpha Chemical Co., Ltd.

[0040] Dipentene and 4-isopropenyltoluene were both purchased from Jiangxi Jiajin Forest Products Chemical Co., Ltd.

[0041] Aromatic hydrocarbon-rich distillate oils with distillation ranges of 180-220℃, 220-280℃, and 280-350℃: all sourced from Yanshan Petrochemical Company;

[0042] Polyetheramines with weight-average molecular weights of 1000, 1200, and 1500 were all purchased from Jinan Yongcheng New Material Technology Co., Ltd.

[0043] The polymers with structural diagrams shown in Formula I are polymerization inhibitors and stabilizers PMV-A-18 (weight-average molecular weight of 7175), the polymers with structural diagrams shown in Formula II are polymerization inhibitors and stabilizers PMV-N-18 (weight-average molecular weight of 12850), and the polymers with structural diagrams shown in Formula III are polymerization inhibitors and stabilizers PMV-B-18 (weight-average molecular weight of 11930): all were purchased from East China University of Science and Technology Huachang Polymer Co., Ltd.

[0044] N-Methylpyrrolidone: CAS872-50-4, purchased from Jinan Hexin Chemical Co., Ltd.;

[0045] Xylene: CAS1330-20-7, purchased from Shandong Haocheng Chemical New Materials Co., Ltd.;

[0046] Bituminous plugging material: taken from Shunbei Oil and Gas Field.

[0047] Example 1

[0048] 3.0g of azobenzene, 1.8g of polyetheramine (weight average molecular weight 1500), 1.0g of polymerization inhibitor stabilizer PMV-A-18, and 14.2g of polycyclic aromatic hydrocarbon-rich distillate oil with a distillation range of 180-220℃ were weighed out and stirred at 30℃ and 1000rpm for 2h to obtain a dispersion and unblocking composition.

[0049] Example 2

[0050] 3.2g of 2,4-diamine azobenzene, 1.8g of polyetheramine (molecular weight 1500), 0.8g of polymerization inhibitor stabilizer PMV-A-18, and 14.2g of polycyclic aromatic hydrocarbon-rich distillate oil with a distillation range of 220-280℃ were weighed and stirred at 30℃ and 1000rpm for 2h to obtain a dispersion and unblocking composition.

[0051] Example 3

[0052] 3.4g of 1,3-diazoaminodiphenyl, 1.6g of polyetheramine (molecular weight 1500), 0.6g of polymerization inhibitor stabilizer PMV-A-18, and 14.4g of polycyclic aromatic hydrocarbon-rich distillate oil with a distillation range of 280-350℃ were weighed and stirred at 30℃ and 1000rpm for 2h to obtain a dispersion and unblocking composition.

[0053] Example 4

[0054] 3.2g of p-aminoazobenzene, 1.6g of polyetheramine (molecular weight 1200), 0.8g of polymerization inhibitor stabilizer PMV-N-18, and 14.4g of polycyclic aromatic hydrocarbon-rich distillate oil with a distillation range of 180-220℃ were weighed out and stirred at 30℃ and 1500rpm for 2h to obtain a dispersion and unblocking composition.

[0055] Example 5

[0056] 3.8g of p-hydroxyazobenzene, 1.4g of polyetheramine (molecular weight 1200), 0.8g of polymerization inhibitor stabilizer PMV-N-18, and 14.0g of polycyclic aromatic hydrocarbon-rich distillate oil with a distillation range of 220-280℃ were weighed out and stirred at 30℃ and 1500rpm for 2h to obtain a dispersion and unblocking composition.

[0057] Example 6

[0058] 4.0g of 4,4ˊ-dihydroxyazobenzene, 1.4g of polyetheramine (molecular weight 1200), 0.6g of polymerization inhibitor stabilizer PMV-N-18, and 14.0g of polycyclic aromatic hydrocarbon-rich distillate oil with a distillation range of 280-350℃ were weighed and stirred at 30℃ and 1500rpm for 2h to obtain a dispersion and unblocking composition.

[0059] Example 7

[0060] 3.6g of 3,3'-dihydroxyazobenzene, 1.2g of polyetheramine (molecular weight 1200), 0.6g of polymerization inhibitor stabilizer PMV-B-18, and 14.6g of polycyclic aromatic hydrocarbon-rich distillate oil with a distillation range of 180-220℃ were weighed and stirred at 30℃ and 2000rpm for 1h to obtain a dispersion and unblocking composition.

[0061] Example 8

[0062] 4.0g of 4-phenylazobenzene, 1.2g of polyetheramine (molecular weight 1000), 0.8g of polymerization inhibitor stabilizer PMV-B-18, and 14.0g of polycyclic aromatic hydrocarbon-rich distillate oil with a distillation range of 220-280℃ were weighed and stirred at 30℃ and 2000rpm for 1h to obtain a dispersion and unblocking composition.

[0063] Example 9

[0064] 3.0g of dipentene, 1.0g of polyetheramine (molecular weight 1000), 1.0g of polymerization inhibitor stabilizer PMV-B-18, and 15.0g of polycyclic aromatic hydrocarbon-rich distillate oil with a distillation range of 280-350℃ were weighed out and stirred at 30℃ and 2000rpm for 2h to obtain a dispersion and unblocking composition.

[0065] Example 10

[0066] 3.6g of 4-isopropenyltoluene, 1.0g of polyetheramine (molecular weight 1000), 0.6g of polymerization inhibitor stabilizer PMV-A-18, and 14.8g of polycyclic aromatic hydrocarbon-rich distillate oil with a distillation range of 180-220℃ were weighed and stirred at 30℃ and 2000rpm for 2h to obtain a dispersion and unblocking composition.

[0067] Example 11

[0068] 3.6g of 4-isopropenyltoluene, 1.0g of N-methylpyrrolidone, 0.6g of polymerization inhibitor stabilizer PMV-A-18, and 14.8g of polycyclic aromatic hydrocarbon-rich distillate oil with a distillation range of 180-220℃ were weighed and stirred at 30℃ and 2000rpm for 2h to obtain a dispersion and unblocking composition.

[0069] Example 12

[0070] 3.0g of 4-isopropenyltoluene, 1.8g of N-methylpyrrolidone, 1.0g of polymerization inhibitor stabilizer PMV-A-18, and 14.2g of polycyclic aromatic hydrocarbon-rich distillate oil with a distillation range of 180-220℃ were weighed and stirred at 30℃ and 2000rpm for 2h to obtain a dispersion and unblocking composition.

[0071] Comparative Example 1

[0072] 8g of aromatic solvent oil S-100, 4g of xylene, 10.5g of aviation kerosene, 1.35g of oleic acid diethanolamide, 4.05g of linoleic acid diethanolamide, 0.7g of sorbitan monostearate (Span60) and 1.4g of dehydrated sorbitan fatty acid ester (Span80) were added to a reaction vessel and stirred at 40°C for 1.25h to obtain comparative composition 1.

[0073] Comparative Example 2

[0074] The polycyclic aromatic hydrocarbon-rich distillate oil with a distillation range of 180-220℃ in Example 1 was replaced with an equal mass of xylene, and everything else was the same as in Example 1, to obtain Comparative Composition 2.

[0075] Comparative Example 3

[0076] The polyetheramine and polymerization inhibitor PMV-A-18 in Example 1 were removed, and everything else was the same as in Example 1, to obtain Comparative Composition 3.

[0077] Comparative Example 4

[0078] The azobenzene and polymerization inhibitor PMV-A-18 in Example 1 were removed, and the rest were the same as in Example 1, to obtain Comparative Composition 4.

[0079] Comparative Example 5

[0080] By removing azobenzene and polyetheramine from Example 1, and keeping everything else the same as in Example 1, comparative composition 5 was obtained.

[0081] Test Example 1 - Organochlorine Test

[0082] The organic chlorine content (referring to the chlorine element in organic compounds) of the dispersing and unblocking compositions prepared in Examples 1 to 12 and the comparative compositions prepared in Comparative Examples 1 to 5 were determined using the industry standard SY / T 7329-2016, "Determination of Organic Chlorine Content in Oilfield Chemical Agents".

[0083] Testing revealed that the dispersing and unblocking compositions prepared in Examples 1 to 12, and the comparative compositions 2 to 5 prepared in Comparative Examples 2 to 5, did not contain organochlorine compounds; the organochlorine content in comparative composition 1 prepared in Comparative Example 1 was 5830 mg / kg.

[0084] Test Example 2 - Evaluation of the Asphaltene Dispersion and Unblocking Performance of the Dispersion and Unblocking Composition

[0085] Following the steps below, the 30-minute dissolution rate and 60-minute dissolution rate of asphalt plugs prepared by the dispersing and unblocking compositions prepared in Examples 1 to 12 and the comparative compositions 1 to 5 prepared in Comparative Examples 1 to 5 were measured respectively to evaluate the asphalt dispersion and unblocking performance of each dispersing and unblocking composition and each comparative composition.

[0086] Step 1) Take about 3.0g of asphalt blockage material and accurately weigh its mass m;

[0087] Step 2) Measure 10 mL of the dispersing and unblocking composition (or the control composition) and add it to the asphalt blockage colorimetric tube, and record its volume V; after preheating in a 60°C water bath for 15 min, add the asphalt blockage weighed in Step 1), seal the glass stopper tightly, and continue to dissolve in a 60°C constant temperature water bath for 30 min, and time the dissolution t, accurate to the minute.

[0088] Step 3) After dissolving for 30 minutes, filter out the insoluble matter. Before filtration, accurately weigh the filter paper mass s.

[0089] Step 4) Place the filter paper and residual asphalt blockage in a petri dish, dry in a 90°C oven for 2 hours, and weigh the filter paper and residual asphalt blockage by mass M.

[0090] Step 5) Calculate the 30-minute dissolution rate of the dispersing and unblocking composition or the control composition on the asphalt plug according to formula (1):

[0091]

[0092] in:

[0093] v-dissolution rate, mg·mL -1 ·min -1 ;

[0094] m - Mass of bituminous plugging material, g;

[0095] s - Filter paper mass, g;

[0096] M - Residual mass of dried filter paper + asphalt blockage material, g;

[0097] t - dissolution time, taken as 30 min here;

[0098] V-Dispersion Unblocking Composition Dosage, mL;

[0099] Three parallel samples were prepared for each dispersive unblocking composition or control composition, and the arithmetic mean was taken as the test result. The 30-minute dissolution rate of the dispersive unblocking composition or control composition on asphalt plugs was calculated and is shown in Table 1.

[0100] Step 6) Follow the methods described in steps 1) to 4) above, except that the dissolution time in steps 2) and 3) is adjusted from 30 min to 60 min. Measure the mass m of the asphalt plug, the mass s of the filter paper, and the mass M of the filter paper and residual asphalt plug. Calculate the 60-minute dissolution rate of the dispersing and unblocking composition or the control composition on the asphalt plug according to formula (2):

[0101]

[0102] Wherein, K- solubility, %;

[0103] m - Mass of bituminous plugging material, g;

[0104] s - Filter paper mass, g;

[0105] M - Residual mass of dried filter paper + asphalt blockage material, g;

[0106] Three parallel samples were prepared for each dispersing and unblocking composition or control composition, and the arithmetic mean was taken as the test result. The 60-minute dissolution rate of the dispersing and unblocking composition or control composition on asphalt blockages was calculated and is shown in Table 1.

[0107] Table 1. Dispersing and unblocking performance of the dispersing and unblocking compositions and comparative compositions on asphaltene blockages.

[0108]

[0109] Table 1 shows that the dispersing and unblocking compositions prepared in Examples 1 to 12 exhibited good dissolution effects on asphaltene plugging materials at 60°C, with dissolution rates exceeding 75% at 60 min (specifically 76.3% to 95.9%) and dissolution rates ranging from 17.68 to 20.33 mg / mL·min at 30 min. In contrast, Comparative Composition 1, prepared in Comparative Example 1, is a commonly used oil well unblocking system in the prior art. Its dissolution effect on asphaltene plugging materials was significantly worse than that of the dispersing and unblocking compositions prepared in Examples 1 to 12, with a dissolution rate of only 62% at 60 min and a dissolution rate of only about 4.48 mg / mL·min at 30 min, indicating poor dispersing and unblocking performance on asphaltene plugging materials. Compared to Example 1, Comparative Example 2 replaced the 180-220°C polycyclic aromatic hydrocarbon-rich distillate oil used in Example 1 with an equal mass of xylene. The poor compatibility of xylene with the penetrant, dispersant, and polymerization inhibitor stabilizer negatively impacted their dissolution effects on asphaltene plugging materials. Compared with Example 1, the comparative composition 3 provided by Comparative Example 3 contains only penetrant and solvent, the comparative composition 4 provided by Comparative Example 4 contains only dispersant and solvent, and the comparative composition 5 provided by Comparative Example 5 contains only polymerization inhibitor and stabilizer and solvent. The differences in the dispersion and unblocking performance of asphaltene blockage are as follows: at 60°C, the 30-minute dissolution rate of the dispersion and unblocking composition prepared in Example 1 for asphaltene blockage is 19.60 mg / mL·min, while the 30-minute dissolution rates of the comparative compositions prepared in Comparative Examples 3, 4 and 5 for asphaltene blockage are 3.47 mg / mL·min, 1.98 mg / mL·min and 1.57 mg / mL·min, respectively. The 30-minute dissolution rate of Example 1 is much higher than the sum of the 30-minute dissolution rates of Comparative Examples 3, 4 and 5. The above comparison of Examples 1 and Comparative Examples 3 to 5 proves that in the dispersing and unblocking composition provided by the present invention, the penetrant, dispersant and polymerization inhibitor stabilizer have a synergistic effect in improving the dissolution rate of asphaltene blockages. The dispersing and unblocking composition provided by the present invention has a good dispersing and unblocking effect on asphaltene blockages. Unblocking systems outside the scope of the present invention cannot exert the above synergistic effect, and naturally cannot achieve the dispersing and unblocking effect of the dispersing and unblocking composition provided by the present invention on asphaltene blockages.

[0110] While the present invention has been described with reference to specific embodiments, those skilled in the art will understand that various changes can be made without departing from the true spirit and scope of the invention. Furthermore, numerous modifications can be made to the subject, spirit, and scope of the invention to suit specific situations, materials, material compositions, and methods. All such modifications are included within the scope of the claims of the present invention.

Claims

1. A dispersing and unblocking composition comprising a penetrant, a dispersant, a polymerization inhibitor stabilizer, and a solvent; The polymerization inhibitor stabilizer is a polymer containing an aromatic ring structure and a long alkyl side chain structure.

2. The composition according to claim 1, characterized in that, The aromatic ring structure is any one of aniline, naphthylamine, and aminobenzimidazolyl; and / or The alkyl long side chain structure is C 18 Straight-chain alkyl groups.

3. The composition according to claim 1 or 2, characterized in that, The mass of the dispersing and unblocking composition is 100%, the amount of the penetrant is 15 to 20 wt%, the amount of the dispersant is 5 to 9 wt%, the amount of the polymerization inhibitor and stabilizer is 3 to 5 wt%, and the amount of the solvent is 70 to 75 wt%.

4. The composition according to any one of claims 1 to 3, characterized in that, The polymerization inhibitor is at least one of the polymers whose structural diagrams are shown in Formula I, Formula II and Formula III; Where m and n represent the number of single-unit cells; the ratio of m to n is 10:9; Preferably, the weight-average molecular weight of the polymerization inhibitor is between 7175 and 12850.

5. The composition according to any one of claims 1 to 4, characterized in that, The penetrant is a small molecule compound containing a cyclic structure and having isomers.

6. The composition according to claim 5, characterized in that, The penetrant is selected from at least one of azobenzene, 2,4-diamine azobenzene, 1,3-diazoaminodiphenyl, p-aminoazobenzene, p-hydroxyazobenzene, 4,4′-dihydroxyazobenzene, 3,3'-dihydroxyazobenzene, 4-phenylazobenzene, dipentene, and 4-isopropenyltoluene.

7. The composition according to any one of claims 1 to 6, characterized in that, The dispersant is a polyetheramine and / or N-methylpyrrolidone; Preferably, the polyetheramine has a molecular weight of 1000 to 1500.

8. The composition according to any one of claims 1 to 7, characterized in that, The solvent is an aromatic hydrocarbon-rich distillate oil.

9. The composition according to claim 8, characterized in that, The aromatic-rich distillate is at least one of the distillate oils obtained in the diesel catalytic hydrotreating unit of a refinery within a distillation range of 180 to 350°C.

10. The use of the composition according to any one of claims 1 to 9 in the dispersive unblocking treatment of asphalt deposit blockage.

Images