Oil-soluble viscosity reducer composition as well as preparation method and application thereof

Abstract

The invention relates to an oil-soluble viscosity reducer composition and a preparation method and application thereof.The oil-soluble viscosity reducer composition is formed by compounding alkyl pyridine and coker diesel oil and can rapidly permeate into thick oil, the viscosity of the thick oil is greatly reduced, and the fluidity of the thick oil is improved. When the oil-soluble viscosity reducer is used in heavy oil reservoir exploitation, storage and transportation processes, the use amount of thin oil for blending heavy oil with thin oil can be saved, the cost of the oil-soluble viscosity reducer is reduced, efficient exploitation, gathering and transportation of the heavy oil reservoir are guaranteed, cost-reducing and efficiency-increasing exploitation of the heavy oil reservoir is realized, and high-added-value comprehensive utilization of coker diesel oil is facilitated.

Description

Technical Field

[0001] This disclosure relates to the field of petrochemical technology, specifically to an oil-soluble viscosity reducer composition, its preparation method, and its uses. Background Technology

[0002] With the increasing demand for petroleum resources, heavy oil has become an important alternative energy source. Heavy oil has a high content of gums and asphaltenes, and contains more oxygen, nitrogen, sulfur, and other atomic and metallic elements than conventional crude oil, resulting in high viscosity, high density, and poor fluidity. This significantly increases the difficulty and cost of heavy oil extraction, gathering, transportation, and processing. Oil-soluble viscosity reducers can partially break down aggregates formed by gums and asphaltenes. They can be directly added to heavy oil for viscosity reduction and avoid post-processing problems (such as dehydration) associated with emulsified viscosity reduction, showing great development potential. However, several problems remain, such as low viscosity reduction rates, high prices, high concentrations required, and poor applicability to crude oil, which inhibit the promotion and use of oil-soluble viscosity reducers.

[0003] Patent CN107663448B discloses an oil-soluble viscosity reducer for heavy oil transportation. This oil-soluble viscosity reducer comprises the following components by mass percentage: 25%-33% mixed benzene, 15%-20% heavy aromatics, 15%-20% carboxylates, 5%-10% mixed acrylates, 10%-15% anionic surfactant, and 2%-7% oil-soluble penetrant. The oil-soluble viscosity reducer provided by this invention can effectively reduce the viscosity of heavy oil. However, the mixed benzene mentioned in this invention is selected from at least two of benzene, p-xylene, and o-xylene, and has characteristics such as low flash point, flammability, and explosiveness; therefore, safety precautions must be taken during on-site construction.

[0004] Patent CN102492410B discloses a heavy oil-soluble viscosity reducer and its preparation method. The main component is a quaternary copolymer of higher carbon alcohol methacrylate-styrene-N,N,-di(methacryloyl)diamine-maleic anhydride, the auxiliary components are Span-80 and an organosilicon surfactant, and the solvent is a mixture of petroleum-based solvents and benzene-based solvents. This viscosity reducer is suitable for heavy oil reservoirs with the characteristics of Lungu reservoirs, exhibiting good viscosity-reducing effects and saving on the amount of thinner oil used. Summary of the Invention

[0005] The purpose of this disclosure is to provide an oil-soluble viscosity reducer composition, its preparation method, and its use. This oil-soluble viscosity reducer composition can significantly reduce the viscosity of heavy oil and improve its fluidity.

[0006] To achieve the above objectives, the first aspect of this disclosure provides an oil-soluble viscosity reducer composition comprising hydrocarbon pyridine and coking diesel oil; the hydrocarbon pyridine content is 35 to 55 parts by weight and the coking diesel oil content is 45 to 65 parts by weight relative to 100 parts by weight of the oil-soluble viscosity reducer composition.

[0007] The hydrocarbon pyridine has the structure shown in formula (Ⅰ):

[0008]

[0009] In formula (Ⅰ), R1, R2 and R3 may be the same or different, and each is independently selected from H, straight-chain or branched alkyl groups with 1 to 14 carbon atoms, straight-chain or branched alkenyl groups with 2 to 14 carbon atoms, and straight-chain or branched alkynyl groups with 2 to 14 carbon atoms; the sum of the number of carbon atoms in R1, R2 and R3 is 2 to 16.

[0010] Optionally, in formula (Ⅰ), R1, R2 and R3 may be the same or different, and each is independently selected from H and straight-chain alkyl with 1 to 10 carbon atoms, and the sum of the carbon atoms of R1, R2 and R3 is 3 to 10;

[0011] Preferably, R1 is selected from a straight-chain alkyl group having 4 to 8 carbon atoms, and R2 and R3 are both H.

[0012] Optionally, the alkylpyridine is selected from one or more of 4-n-butylpyridine, 4-n-pentylpyridine, 4-n-hexylpyridine, 4-n-heptylpyridine, 4-n-octylpyridine, 4-n-nonylpyridine, 4-n-decylpyridine, 4-(5-nonyl)pyridine, 3-n-butylpyridine, 3-n-hexylpyridine, 3-isobutylpyridine, 3-ethyl-4-methylpyridine, 4-vinylpyridine, and 4-ethynylpyridine.

[0013] Optionally, relative to 100 parts by weight of the oil-soluble viscosity reducer composition, the content of the hydrocarbon pyridine is 40 to 50 parts by weight, and the content of the coking diesel is 50 to 60 parts by weight.

[0014] Optionally, the weight ratio of the hydrocarbon pyridine to coking diesel is 1:(0.82 to 1.86), preferably 1:(1 to 1.5).

[0015] Optionally, the coking diesel oil has a distillation range of 180–350°C and a density of 0.86–0.92 g / cm³ at 20°C. 3 .

[0016] The second aspect of this disclosure provides a method for preparing the oil-soluble viscosity reducer composition described in the first aspect of this disclosure, the method comprising: mixing and stirring the hydrocarbon pyridine and coking diesel.

[0017] Optionally, the mixing temperature is 10–50°C, and the stirring time is 10–60 min.

[0018] This third aspect of the disclosure provides the use of the oil-soluble viscosity-reducing composition described in the first aspect of the disclosure in the exploitation and / or gathering and transportation of heavy oil reservoirs.

[0019] Optionally, the use of the oil-soluble viscosity reducer composition in heavy oil reservoir development includes: injecting the oil-soluble viscosity reducer composition and CO2 slug into the oil well, simmering the well for 3 to 15 days, and then proceeding with development; wherein the viscosity of the heavy oil at 50°C is above 500 mPa·s.

[0020] Through the above technical solution, this disclosure provides an oil-soluble viscosity reducer composition, its preparation method, and its uses. This oil-soluble viscosity reducer composition is formed by compounding a specific structured hydrocarbon pyridine with coking diesel oil. The 3rd, 4th, and 5th positions of the hydrocarbon pyridine are independently replaced by H, an alkyl group with 1-14 carbon atoms, an alkenyl group with 2-14 carbon atoms, or an alkynyl group with 2-14 carbon atoms. Furthermore, the total number of carbon atoms of the substituents at the 3rd, 4th, and 5th positions is 2-16. The nitrogen atom of the hydrocarbon pyridine can form hydrogen bonds and acid-base interactions with the N, O, and S heteroatoms of gums and asphaltenes. The alkyl chains on the substituents can sterically hinder the gum and asphaltenes molecules, disrupting their spatial network structure, releasing the encapsulated alkyl aromatics, and partially disintegrating the aggregates formed by gums and asphaltenes. This reduces the aggregate particle size, weakens friction, lowers the viscosity of heavy oil, and significantly improves its fluidity. Coking diesel can dilute heavy oil. The saturated hydrocarbons in coking diesel can disperse gum molecules, and the aromatic hydrocarbons can disrupt the π-π interactions between gums and asphaltenes. Furthermore, coking diesel has numerous heteroatoms, which can form hydrogen bonds with the polar groups of gums and asphaltenes. The alkylpyridine and coking diesel disclosed in this invention have a synergistic effect, and the resulting oil-soluble viscosity-reducing composition has good compatibility with heavy oil, can quickly penetrate into heavy oil, and significantly reduce its viscosity, improving its fluidity. Using this oil-soluble viscosity-reducing composition in the exploitation and storage of heavy oil reservoirs can save on the amount of thinner used for blending heavy oil, reduce the cost of oil-soluble viscosity-reducing agents, ensure efficient development and gathering of heavy oil reservoirs, achieve cost-effective and efficient exploitation of heavy oil reservoirs, and facilitate the high-value-added comprehensive utilization of coking diesel.

[0021] Other features and advantages of the present invention will be described in detail in the following detailed description section. Detailed Implementation

[0022] The following provides a detailed description of specific embodiments of this disclosure. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit this disclosure.

[0023] The first aspect of this disclosure provides an oil-soluble viscosity reducer composition comprising hydrocarbon pyridine and coking diesel oil; the hydrocarbon pyridine content is 35 to 55 parts by weight and the coking diesel oil content is 45 to 65 parts by weight relative to 100 parts by weight of the oil-soluble viscosity reducer composition.

[0024] The hydrocarbon pyridine includes compounds having the structure shown in formula (Ⅰ):

[0025]

[0026] In formula (Ⅰ), R1, R2 and R3 may be the same or different, and each is independently selected from H, straight-chain or branched alkyl groups with 1 to 14 carbon atoms, straight-chain or branched alkenyl groups with 2 to 14 carbon atoms, and straight-chain or branched alkynyl groups with 2 to 14 carbon atoms; the sum of the number of carbon atoms in R1, R2 and R3 is 2 to 16.

[0027] The oil-soluble viscosity reducer composition disclosed herein is formed by compounding a specific structured hydrocarbon pyridine with coking diesel oil. The 3rd, 4th, and 5th positions of the hydrocarbon pyridine are independently replaced by H, an alkyl group with 1-14 carbon atoms, an alkenyl group with 2-14 carbon atoms, or an alkynyl group with 2-14 carbon atoms. The total number of carbon atoms of the substituents at the 3rd, 4th, and 5th positions is 2-16. The nitrogen atom of the hydrocarbon pyridine can form hydrogen bonds and acid-base interactions with the N, O, and S heteroatoms of gums and asphaltenes. The alkyl chains on the substituents can sterically hinder the gum and asphaltenes molecules, disrupting their spatial network structure, releasing the encapsulated alkyl aromatics, and partially disintegrating the aggregates formed by gums and asphaltenes. This reduces the aggregate particle size, weakens friction, lowers the viscosity of heavy oil, and significantly improves its fluidity. Coking diesel can dilute heavy oil. The saturated hydrocarbons in coking diesel can disperse gum molecules, and the aromatic hydrocarbons can disrupt the π-π interactions between gums and asphaltenes. In addition, coking diesel has a large number of heteroatoms, which can form hydrogen bonds with the polar groups of gums and asphaltenes. The alkylpyridine and coking diesel disclosed in this invention have a synergistic effect. The oil-soluble viscosity reducer composition formed by their compounding has good compatibility with heavy oil, can quickly penetrate into heavy oil, significantly reduce the viscosity of heavy oil, and improve the fluidity of heavy oil.

[0028] In this disclosure, straight-chain alkyl, straight-chain alkenyl, or straight-chain alkynyl refers to an alkyl, alkenyl, or alkynyl group whose main carbon atom chain has no branching structure. Branched-chain alkyl, branched-chain alkenyl, or branched-chain alkynyl refers to an alkyl, alkenyl, or alkynyl group whose main carbon atom chain has branching structure, and the branching structure contains only carbon and hydrogen atoms. The carbon-carbon double bond of the branched alkenyl group can be located on the main chain or on the branch, and the carbon-carbon triple bond of the branched alkynyl group can be located on the main chain or on the branch; this disclosure does not impose any restrictions on this.

[0029] The number of carbon atoms in the alkyl, alkenyl, or alkynyl groups disclosed herein refers to the total number of carbon atoms. For example, if R1 is selected from a branched alkyl group with 10 carbon atoms, then the total number of carbon atoms in the main chain and branches of R1 is 10.

[0030] In one embodiment of this disclosure, in formula (I), R1, R2, and R3 may be the same or different, and each is independently selected from H and straight-chain alkyl groups having 1 to 10 carbon atoms, wherein the sum of the carbon atoms of R1, R2, and R3 is 3 to 10. In a preferred embodiment, R1 is selected from straight-chain alkyl groups having 4 to 8 carbon atoms, and R2 and R3 are both H. In the above embodiments, the selection of preferred R1, R2, and R3 is beneficial for further dispersing the asphaltene aggregate structure, inhibiting the association, aggregation, and deposition of asphaltene, and improving the stability of the crude oil colloidal system.

[0031] In a specific embodiment, the hydrocarbon pyridine is selected from one or more of 4-n-butylpyridine, 4-n-pentylpyridine, 4-n-hexylpyridine, 4-n-heptylpyridine, 4-n-octylpyridine, 4-n-nonylpyridine, 4-n-decylpyridine, 4-(5-nonyl)pyridine, 3-n-butylpyridine, 3-n-hexylpyridine, 3-isobutylpyridine, 3-ethyl-4-methylpyridine, 4-vinylpyridine, and 4-ethynylpyridine.

[0032] In one embodiment of this disclosure, the content of the hydrocarbon pyridine is 35 to 50 parts by weight and the content of the coking diesel is 55 to 65 parts by weight relative to 100 parts by weight of the oil-soluble viscosity reducer composition; preferably, the content of the hydrocarbon pyridine is 40 to 50 parts by weight and the content of the coking diesel is 50 to 60 parts by weight relative to 100 parts by weight of the oil-soluble viscosity reducer composition.

[0033] In one specific embodiment, the weight ratio of the hydrocarbon pyridine to coking diesel is 1:(0.82-1.86), preferably 1:(1-1.5). In the above embodiment, using hydrocarbon pyridine and coking diesel with preferred contents can further reduce the viscosity of heavy oil and improve its fluidity.

[0034] In one embodiment of this disclosure, the coking diesel oil has a distillation range of 180–350°C and a density of 0.8867 g / cm³ at 20°C. 3 The viscosity at 50℃ is 4.9 mPa·s.

[0035] The coking diesel fuel disclosed herein is one of the main liquid products of delayed coking units. Delayed coking units are key processing units in refineries for increasing the yield of light oils and producing petroleum coke. They transform heavy, low-value oil products such as atmospheric residue, vacuum residue, heavy crude oil, and coal tar into high-value liquid and gaseous products through deep thermal cracking reactions, while simultaneously generating petroleum coke. Coking diesel fuel is a fraction with a boiling range of 180–350°C obtained from the delayed coking process. Coking diesel fuel has a high cetane number, contains a certain amount of sulfur, nitrogen, and metallic impurities, as well as a certain amount of olefins. It exhibits poor oxidation stability, excessive gum content, and high color. Therefore, it must be refined to remove sulfur and nitrogen impurities before olefins, aromatics, and saturated hydrocarbons can be classified as qualified diesel fuel fractions.

[0036] The second aspect of this disclosure provides a method for preparing the oil-soluble viscosity reducer composition described in the first aspect of this disclosure, the method comprising: mixing and stirring the hydrocarbon pyridine and coking diesel.

[0037] In one embodiment of this disclosure, the mixing temperature is 10–50°C, and the stirring time is 10–60 min.

[0038] This third aspect of the disclosure provides the use of the oil-soluble viscosity-reducing composition described in the first aspect of the disclosure in the development and / or gathering and transportation of heavy oil reservoirs, particularly in the CO2 displacement method for the development of heavy oil.

[0039] The oil-soluble viscosity reducer composition disclosed herein can be used in the exploitation and storage of heavy oil reservoirs to save the amount of thin oil used for blending heavy oil, reduce the cost of oil-soluble viscosity reducers, ensure the efficient development and gathering of heavy oil reservoirs, realize cost reduction and efficiency improvement in the exploitation of heavy oil reservoirs, and facilitate the high-value-added comprehensive utilization of coking diesel.

[0040] In one embodiment of this disclosure, the use of the oil-soluble viscosity-reducing composition in heavy oil reservoir development includes: injecting the oil-soluble viscosity-reducing composition and a CO2 slug into an oil well, simmering the well for 3–15 days, and then proceeding with production; wherein the viscosity of the heavy oil at 50°C is above 500 mPa·s. In the above embodiment, dissolving CO2 in crude oil can cause the crude oil volume to expand, reducing the crude oil viscosity. CO2 can also replenish formation deficits, increase formation pressure, and accelerate the backflow rate of fluids during production. The oil-soluble viscosity-reducing composition provided in this disclosure can work synergistically with CO2 to further reduce the viscosity of heavy oil and increase oil well production.

[0041] Unless otherwise specified, all reagents used in the following examples and comparative examples are commercially available chemical reagents, and there are no particular limitations. The coking diesel oil used was supplied by a refinery in Xinjiang, with a distillation range of 180–350°C and a density of 0.8867 g / cm³ at 20°C. 3 The viscosity at 50℃ is 4.9 mPa·s. The viscosity was tested according to the method in enterprise standard Q / CP XJH0045-2021, and the instrument used was a Brookfield DV-II viscometer.

[0042] Example 1

[0043] At 30°C, 45 parts by weight of 4-n-hexylpyridine and 55 parts by weight of coking diesel oil were added to a reactor and stirred for 30 minutes to obtain an oil-soluble viscosity reducer composition, designated JYR-1. Relative to 100 parts by weight of JYR-1, the content of alkylpyridine was 45 parts by weight, the content of coking diesel oil was 55 parts by weight, and the weight ratio of alkylpyridine to coking diesel oil was 1:1.2. Specific preparation conditions and product composition are shown in Table 1.

[0044] Example 2

[0045] Same as Example 1, except that 4-n-hexylpyridine was replaced with the same amount of 4-n-butylpyridine and the stirring time was 20 min to obtain an oil-soluble viscosity reducer composition, designated JYR-2. The specific preparation conditions and product composition are shown in Table 1.

[0046] Example 3

[0047] Same as Example 1, except that 4-n-hexylpyridine was replaced with the same amount of 4-n-decylpyridine and the stirring time was 20 min to obtain an oil-soluble viscosity reducer composition, designated JYR-3. The specific preparation conditions and product composition are shown in Table 1.

[0048] Example 4

[0049] Same as Example 1, except that 4-n-hexylpyridine was replaced with the same amount of 3-n-hexylpyridine to prepare an oil-soluble viscosity reducer composition, designated JYR-4. The specific preparation conditions and product composition are shown in Table 1.

[0050] Example 5

[0051] Same as Example 1, except that 4-n-hexylpyridine was replaced with the same amount of 3-ethyl-4-methylpyridine to prepare an oil-soluble viscosity reducer composition, designated JYR-5. The specific preparation conditions and product composition are shown in Table 1.

[0052] Example 6

[0053] Same as Example 1, except that 35 parts by weight of 4-n-hexylpyridine and 65 parts by weight of coking diesel were added to the reactor to prepare an oil-soluble viscosity reducer composition, designated JYR-6, such that the weight ratio of hydrocarbon pyridine to coking diesel in JYR-6 was 1:1.86. The specific preparation conditions and product composition are shown in Table 1.

[0054] Example 7

[0055] Same as Example 1, except that: 50 parts by weight of 4-n-hexylpyridine and 50 parts by weight of coking diesel were added to the reactor and stirred for 40 minutes to obtain an oil-soluble viscosity reducer composition, designated JYR-7, such that the weight ratio of hydrocarbon pyridine to coking diesel in JYR-7 is 1:1. The specific preparation conditions and product composition are shown in Table 1.

[0056] Example 8

[0057] Same as Example 1, except that 55 parts by weight of 4-n-hexylpyridine and 45 parts by weight of coking diesel were added to the reactor and stirred for 40 minutes to obtain an oil-soluble viscosity reducer composition, designated JYR-8, such that the weight ratio of hydrocarbon pyridine to coking diesel in JYR-8 is 1:0.82. The specific preparation conditions and product composition are shown in Table 1.

[0058] Example 9

[0059] Same as Example 1, except that 4-n-hexylpyridine was replaced with the same amount of 4-vinylpyridine to prepare an oil-soluble viscosity reducer composition, designated JYR-9. The specific preparation conditions and product composition are shown in Table 1.

[0060] Example 10

[0061] Same as Example 1, except that 4-n-hexylpyridine was replaced with the same amount of 4-ethynylpyridine to prepare an oil-soluble viscosity reducer composition, designated JYR-10. The specific preparation conditions and product composition are shown in Table 1.

[0062] Comparative Example 1

[0063] At 30℃, 100 parts by weight of 4-n-hexylpyridine were taken as a control sample, numbered DBJ-1.

[0064] Comparative Example 2

[0065] At 30℃, 100 parts by weight of coking diesel oil were taken as a control sample, numbered DBJ-2.

[0066] Comparative Example 3

[0067] At 30℃, 100 parts by weight of xylene organic solvent were taken as a control sample, numbered DBJ-3.

[0068] Comparative Example 4

[0069] Same as Example 1, except that 4-n-hexylpyridine was replaced with the same amount of 2,4-dimethylpyridine to prepare the comparative sample, numbered DBJ-4. The specific preparation conditions and product composition are shown in Table 1.

[0070] Comparative Example 5

[0071] Same as Example 1, except that 4-n-hexylpyridine was replaced with the same amount of 4-methylpyridine to prepare the comparative sample, numbered DBJ-5. The specific preparation conditions and product composition are shown in Table 1.

[0072] Comparative Example 6

[0073] Same as Example 1, except that 45 parts by weight of 4-n-hexylpyridine were replaced with 25 parts by weight of 4-n-hexylpyridine, and 75 parts by weight of coking diesel oil were added to prepare a comparative sample, numbered DBJ-6. The weight ratio of hydrocarbon pyridine to coking diesel oil in DBJ-6 was 1:3. The specific preparation conditions and product composition are shown in Table 1.

[0074] Comparative Example 7

[0075] Same as Example 1, except that 4-n-hexylpyridine was replaced with the same amount of 2-vinylpyridine to prepare the comparative sample, numbered DBJ-7. The specific preparation conditions and product composition are shown in Table 1.

[0076] Comparative Example 8

[0077] Same as Example 1, except that 4-n-hexylpyridine was replaced with the same amount of 2-ethynylpyridine to prepare the comparative sample, numbered DBJ-8. The specific preparation conditions and product composition are shown in Table 1.

[0078] Comparative Example 9

[0079] Same as Example 1, except that 4-n-hexylpyridine was replaced with the same amount of 2-hexylpyrrole to prepare the comparative sample, numbered DBJ-9. The specific preparation conditions and product composition are shown in Table 1.

[0080] Comparative Example 10

[0081] Similar to Example 1, except that the coking diesel was replaced with the same amount of straight-run diesel to prepare a comparative sample, designated DBJ-10. Specific preparation conditions and product composition are shown in Table 1. The straight-run diesel was supplied by a refinery, with a distillation range of 200–350°C and a density of 0.83 g / cm³ at 20°C. 3The viscosity at 50℃ is 2.8 mPa·s. The viscosity was tested according to the method in enterprise standard Q / CP XJH0045-2021, and the instrument used was a Brookfield DV-II viscometer.

[0082] Test case

[0083] For a certain heavy oil from the Tarim Oilfield, the viscosity reduction rate of samples prepared in Examples 1-10 and Comparative Examples 1-10 was tested. The experimental steps are as follows: The heavy oil was dehydrated using an electro-dehydration tester; the initial viscosity of the heavy oil at 50°C was measured to be 13260 mPa·s using a rheometer; then, 5% by weight of the above-mentioned viscosity reducer sample was added to the heavy oil, and the viscosity of the heavy oil at 50°C after adding the viscosity reducer was tested. The viscosity reduction rate was calculated according to the following formula: Viscosity reduction rate (%) = 100% × (initial heavy oil viscosity - heavy oil viscosity after adding viscosity reducer) / initial heavy oil viscosity.

[0084] The test results are shown in Table 1:

[0085] Table 1

[0086]

[0087]

[0088] As can be seen from the results in Table 1 above, the oil-soluble viscosity-reducing compositions provided in Examples 1-10 of this disclosure all have significant viscosity-reducing effects on heavy oil, improving its fluidity and facilitating cost-effective and efficient exploitation of heavy oil reservoirs, as well as achieving high-value-added comprehensive utilization of coking diesel. However, Comparative Examples 1-10 did not use the oil-soluble viscosity-reducing compositions of this disclosure and could not effectively reduce the viscosity of heavy oil, resulting in a low viscosity reduction rate. Comparative Examples 1-2 used only 4-n-hexylpyridine or coking diesel as viscosity-reducing agents, and the viscosity reduction rate for heavy oil was not ideal. Comparing Example 1 with Comparative Example 10 shows that coking diesel has more heteroatoms, which can form hydrogen bonds with the polar groups of gums and asphaltenes, resulting in a significant viscosity-reducing effect on heavy oil and improving its fluidity.

[0089] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0090] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0091] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. An oil-soluble viscosity reducer composition, characterized in that, The oil-soluble viscosity reducer composition comprises hydrocarbon pyridine and coking diesel oil; relative to 100 parts by weight of the oil-soluble viscosity reducer composition, the content of hydrocarbon pyridine is 35 to 55 parts by weight, and the content of coking diesel oil is 45 to 65 parts by weight. The hydrocarbon pyridine has the structure shown in formula (Ⅰ): In formula (Ⅰ), R1, R2 and R3 may be the same or different, and each is independently selected from H, straight-chain or branched alkyl groups with 1 to 14 carbon atoms, straight-chain or branched alkenyl groups with 2 to 14 carbon atoms, and straight-chain or branched alkynyl groups with 2 to 14 carbon atoms; the sum of the number of carbon atoms in R1, R2 and R3 is 2 to 16.

2. The oil-soluble viscosity reducer composition according to claim 1, characterized in that, In formula (Ⅰ), R1, R2 and R3 may be the same or different, and each is independently selected from H and straight-chain alkyl with 1 to 10 carbon atoms, and the sum of the number of carbon atoms of R1, R2 and R3 is 3 to 10; Preferably, R1 is selected from a straight-chain alkyl group having 4 to 8 carbon atoms, and R2 and R3 are both H.

3. The oil-soluble viscosity reducer composition according to claim 1, characterized in that, The alkylpyridine is selected from one or more of 4-n-butylpyridine, 4-n-pentylpyridine, 4-n-hexylpyridine, 4-n-heptylpyridine, 4-n-octylpyridine, 4-n-nonylpyridine, 4-n-decylpyridine, 4-(5-nonyl)pyridine, 3-n-butylpyridine, 3-n-hexylpyridine, 3-isobutylpyridine, 3-ethyl-4-methylpyridine, 4-vinylpyridine, and 4-ethynylpyridine.

4. The oil-soluble viscosity reducer composition according to claim 1, characterized in that, The content of the hydrocarbon pyridine is 40-50 parts by weight and the content of the coking diesel is 50-60 parts by weight relative to 100 parts by weight of the oil-soluble viscosity reducer composition.

5. The oil-soluble viscosity reducer composition according to claim 1, characterized in that, The weight ratio of the hydrocarbon pyridine to coking diesel is 1:(0.82-1.86), preferably 1:(1-1.5).

6. The oil-soluble viscosity reducer composition according to claim 1, characterized in that, The coking diesel oil has a distillation range of 180–350℃ and a density of 0.86–0.92 g / cm³ at 20℃. 3 .

7. A method for preparing the oil-soluble viscosity-reducing composition according to any one of claims 1 to 6, characterized in that, The method includes mixing and stirring the hydrocarbon pyridine and coking diesel.

8. The method according to claim 7, characterized in that, The mixing temperature is 10–50°C, and the stirring time is 10–60 min.

9. Use of the oil-soluble viscosity reducer composition according to any one of claims 1 to 6 in heavy oil reservoir development and / or heavy oil gathering and transportation.

10. The use according to claim 9, characterized in that, The use of the oil-soluble viscosity reducer composition in heavy oil reservoir development includes: injecting the oil-soluble viscosity reducer composition and CO2 slug into the oil well, simmering the well for 3 to 15 days, and then proceeding with development; wherein the viscosity of the heavy oil at 50°C is above 500 mPa·s.

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