Oil-soluble viscosity reducer composition, preparation method and application thereof, and method for reducing viscosity of thickened oil

Abstract

The invention relates to the technical field of thickened oil recovery and transportation, and discloses an oil-soluble viscosity reducer composition and a preparation method and application thereof, based on the total amount of the viscosity reducer composition, the composition comprises cyclohexenone compounds and thin oil; wherein the mass ratio of the cyclohexenone compound to the thin oil is (0.01-1): 1. The viscosity reducer composition contains cyclohexenone compounds and thin oil, and can reduce the viscosity of heavy oil, improve the fluidity of the heavy oil, guarantee the exploitation and transportation of heavy oil reservoirs, and realize cost-reducing and efficiency-increasing exploitation of the heavy oil reservoirs.

Description

Technical Field

[0001] This invention relates to the field of heavy oil extraction and transportation technology, specifically to an oil-soluble viscosity reducer composition, its preparation method and application, and a method for reducing the viscosity of heavy oil. Background Technology

[0002] With rapid economic development, global demand for fossil fuels is constantly increasing, and many countries are intensifying their exploration and development of oil and natural gas resources. Due to the rapid decline in light crude oil reserves, unconventional oil and gas resources such as heavy oil are receiving increasing attention. Compared to conventional crude oil, heavy oil has higher viscosity, extremely poor fluidity at room temperature, and can even solidify and clog wells and pipelines, increasing the inconvenience and cost of crude oil extraction and transportation. Therefore, exploring efficient and low-cost methods for extracting and transporting high-viscosity, high-pour-point crude oil is crucial.

[0003] Currently, methods for improving the fluidity of heavy oil are mainly divided into physical and chemical methods. Physical methods include heating and dilution, while chemical methods include emulsification and dispersion, microbial methods, and the addition of oil-soluble viscosity reducers. Adding viscosity reducers has advantages such as low energy consumption, low cost, low pollution, good effect, and no need for subsequent processing. The interaction between viscosity reducers and asphaltenes and colloidal aggregates in crude oil is usually the most important reason for crude oil viscosity reduction. Generally, viscosity reducer molecules often contain many highly polar groups. These groups enter the crude oil and form hydrogen bonds with asphaltenes and colloids at higher temperatures. They break the crystalline structure formed by the overlapping and superimposed asphaltenes and colloidal molecules, thereby reducing the viscosity of heavy oil and enhancing its fluidity at low temperatures.

[0004] CN107663448 A discloses an oil-soluble viscosity reducer for heavy oil transportation. This oil-soluble viscosity reducer comprises the following components in weight percentages: 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. This oil-soluble viscosity reducer has a complex composition and requires the addition of additional surfactants to improve dispersibility.

[0005] CN112707877A discloses an oil-soluble viscosity reducer for efficient viscosity reduction of residual oil and its preparation method. The oil-soluble viscosity reducer of this invention first synthesizes a fluorinated surfactant with a specific structure using higher alcohols and fluorinated acids as raw materials, and then uses a mixed solvent to prepare a viscosity reducer solution with a mass concentration of 0.1%-10%. This patent application requires the addition of a fluorinated surfactant for reaction, making the preparation method complex and relatively expensive.

[0006] CN113403053A provides an oil-soluble viscosity reducer for heavy oils, comprising a fatty acid, a fatty acid ester, and a solvent, wherein the number of carbon atoms in the fatty acid and the number of carbon atoms in the fatty acid portion of the fatty acid ester are independently ranging from 12 to 24. This viscosity reducer has a viscosity reduction rate of only 42%, indicating a poor viscosity-reducing effect.

[0007] Currently, most oil-soluble viscosity reducers for heavy oil are flow improvers mainly composed of pour point depressants. Their synthesis process is complex and costly, making large-scale promotion difficult and restricting their application in oil fields. Summary of the Invention

[0008] The purpose of this invention is to overcome the problems of complex synthesis process, high raw material cost, and low viscosity reduction rate of existing oil-soluble viscosity-reducing agent compositions. This invention provides an oil-soluble viscosity-reducing agent composition, its preparation method, and its application, as well as a method for reducing the viscosity of heavy oil. The viscosity-reducing agent composition contains cyclohexenone compounds and light oil. The cyclohexenone compounds can penetrate and disperse into the spaces between the molecules of gum and asphaltenes, making their structure looser. The light oil solvent enhances the dispersibility, solubility, and permeability of heavy oil. Using the above-mentioned viscosity-reducing agent composition can reduce the viscosity of heavy oil, improve its fluidity, and achieve cost-effective and efficient exploitation of heavy oil reservoirs.

[0009] To achieve the above objectives, a first aspect of the present invention provides a viscosity-reducing composition, wherein, based on the total amount of the viscosity-reducing composition, the composition comprises a cyclohexenone compound and a thin oil;

[0010] The mass ratio of the cyclohexenone compound to the dilute oil is 0.01-1:1.

[0011] Preferably, the mass ratio of the cyclohexenone compound to the light oil is 0.05-0.5:1.

[0012] The cyclohexenone compounds have structures as shown in formula (I) and / or formula (II):

[0013]

[0014] Wherein, R1 is H or a C1-C25 alkyl group; R2 is H or a C1-C25 alkyl group; R3 and R4 are each independently H or a C1-C25 alkyl group;

[0015] Preferably, R1 is an H or C1-C7 alkyl group.

[0016] Preferably, R2 is H or a C1-C10 alkyl group.

[0017] Preferably, R3 and R4 are each independently an H or C1-C7 alkyl group.

[0018] Preferably, the cyclohexenone compound is selected from at least one of methylcyclohexenone, 3,5,5-trimethyl-2-cyclohexen-1-one, ethylcyclohexenone, and 3-methyl-5-propyl-2-cyclohexen-1-one.

[0019] A second aspect of the present invention provides a method for preparing the viscosity-reducing composition of the first aspect, wherein the preparation method includes the following steps:

[0020] The viscosity reducer composition is obtained by mixing a cyclohexenone compound, a thin oil, and an optional penetrant.

[0021] The third aspect of the present invention provides the application of the viscosity-reducing composition described in the first aspect in the exploitation and / or gathering and transportation of heavy oil reservoirs.

[0022] A fourth aspect of the present invention provides a method for reducing the viscosity of heavy oil, the method comprising: contacting and reacting the viscosity-reducing composition described in the first aspect with heavy oil;

[0023] The mass ratio of the viscosity-reducing composition to the heavy oil is 1:10-200.

[0024] The beneficial effects achieved through the above technical solution are as follows:

[0025] (1) In the viscosity reducing agent composition of the present invention, the cyclohexenone compounds can penetrate and disperse into the spaces between the molecules of the gum and asphaltenes, making their structure loose. The thin oil solvent enhances the dispersibility, solubility and permeability of the heavy oil, thereby enabling the cyclohexenone compounds to dissolve and disperse better in the heavy oil. With the addition of 3-10 wt% of the viscosity reducing agent composition, the viscosity reduction rate can reach more than 60%, and the viscosity reduction effect is good.

[0026] (2) Preferably, in this invention, the preparation process of the viscosity-reducing composition is simple and suitable for industrial production. The required substances do not require further purification, and it has broad application prospects in the field of crude oil extraction, making it easy to promote and use. The viscosity-reducing composition efficiently utilizes byproducts from catalytic cracking units, increasing product added value and providing a new opportunity for cost reduction and efficiency improvement in crude oil extraction. Detailed Implementation

[0027] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0028] A first aspect of the present invention provides a viscosity-reducing composition, wherein, based on the total amount of the viscosity-reducing composition, the composition comprises a cyclohexenone compound and a thin oil;

[0029] The mass ratio of the cyclohexenone compound to the dilute oil is 0.01-1:1.

[0030] In this invention, the viscosity-reducing composition comprises cyclohexenone compounds and light oil. Adding 3-10 wt% of the viscosity-reducing composition can reduce the viscosity of heavy oil by over 60%. The polar groups in cyclohexenone can form hydrogen bonds with the polar groups in gums and asphaltenes, allowing cyclohexenone to penetrate and disperse between the molecules of the gum and asphaltenes lamellars, making their structure looser. The oil-soluble viscosity-reducing composition can improve the aggregate structure of gums and asphaltenes, forming new small aggregates with the participation of viscosity-reducing molecules, thereby reducing the viscosity of heavy oil. Furthermore, cyclohexenone compounds are mature industrial products with wide availability. Due to the π-π conjugation effect formed by their carbon-carbon and carbon-oxygen double bonds, their flash point is above 80°C, solving the transportation safety problem during long-distance transport.

[0031] In this invention, the term "heavy oil" has the conventional meaning in the art, referring to oil with a surface density greater than 0.943 g / cm³. 3 Crude oil with a viscosity greater than 50 mPa·s underground is called heavy oil. There are no particular limitations on the types and composition of heavy oil.

[0032] According to the present invention, preferably, the cyclohexenone compound has the structure shown in formula (I) and / or formula (II):

[0033]

[0034] Wherein, R1 is H or a C1-C25 alkyl group; R2 is H or a C1-C25 alkyl group; R3 and R4 are each independently H or a C1-C25 alkyl group.

[0035] According to the present invention, R1 is preferably H or a C1-C7 alkyl group. The C1-C7 alkyl group can be a straight-chain alkyl group or a branched-chain alkyl group, preferably a straight-chain alkyl group. Specifically, examples include: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, isopentyl, neopentyl, tert-pentyl, n-hexyl, isohexyl, neohexyl, n-heptyl, isoheptyl, neoheptyl, etc.

[0036] According to the present invention, R2 is preferably H, a C1-C10 alkyl group. The C1-C10 alkyl group can be a straight-chain alkyl group or a branched-chain alkyl group, preferably a straight-chain alkyl group. Specifically, examples include: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, isopentyl, neopentyl, tert-pentyl, n-hexyl, isohexyl, neohexyl, n-heptyl, isoheptyl, n-octyl, isooctyl, n-nonyl, and n-decyl, etc.

[0037] According to the present invention, preferably, R3 and R4 are each independently H, a C1-C7 alkyl group. Preferably, the alkyl group can be a straight-chain alkyl group or a branched alkyl group. As a C1-C7 alkyl group, it can be a straight-chain alkyl group or a branched alkyl group, preferably a straight-chain alkyl group. Specifically, examples include: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, isopentyl, neopentyl, tert-pentyl, n-hexyl, isohexyl, neohexyl, n-heptyl, isoheptyl, neoheptyl, etc.

[0038] In this invention, the type and source of the cyclohexenone compounds are not particularly limited, as long as they meet the above structural formula requirements. They can be commercially available or prepared by existing methods.

[0039] According to a preferred embodiment of the present invention, the cyclohexenone compound is selected from at least one of methylcyclohexenone, 3,5,5-trimethyl-2-cyclohexen-1-one, ethylcyclohexenone, and 3-methyl-5-propyl-2-cyclohexen-1-one. In this invention, the selection of the above-mentioned cyclohexenone compounds allows for better penetration and dispersion between the molecules of the resinous and asphaltenes, achieving a viscosity-reducing effect when combined with thinner oils.

[0040] In this invention, the preferred cyclohexenone compounds are used to formulate viscosity-reducing compositions. The synthesis process is simple, and there are mature process products available. The cost is low, but the composition has a good viscosity-reducing effect and a high flash point, making it relatively safe during transportation and use.

[0041] According to the present invention, preferably, the mass ratio of the cyclohexenone compound to the thin oil is 0.01-1:1, for example, 0.01:1, 0.02:1, 0.05:1, 0.1:1, 0.15:1, 0.2:1, 0.25:1, 0.3:1, 0.35:1, 0.4:1, 0.45:1, 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1:1, or any range between the two, preferably 0.05-0.5:1, more preferably 0.2-0.5:1. In the present invention, by combining the cyclohexenone compound and the thin oil according to the above ratio, the thin oil, as a solvent, enhances the dispersibility, solubility, and permeability of the heavy oil, thereby allowing the oil-soluble viscosity reducer molecules to dissolve and disperse better in the heavy oil.

[0042] According to the present invention, preferably, the viscosity-reducing composition further includes a penetrant. Preferably, the long-chain alkanes in the penetrant are adsorbed onto the surface of heavy oil to form a solvation layer. When macromolecules in the heavy oil approach each other, the solvation layer generates repulsive forces due to its superposition, allowing asphaltenes and gums to disperse better, thus reducing the viscosity of the heavy oil.

[0043] According to the present invention, preferably, the penetrant has a structure as shown in formula (III) and / or formula (IV):

[0044]

[0045] Wherein, R5 is H or a C1-C17 alkyl group, preferably a C8-C12 alkyl group;

[0046] R6 is H or a C1-C17 alkyl group, preferably a C8-C12 alkyl group.

[0047] The penetrant contained in this invention can reduce the viscosity of the mixture formed by heavy oil and viscosity-reducing composition, while making the mixture very stable so that no solid substances precipitate out when stored at low temperature for a long time.

[0048] According to the present invention, preferably, the mass ratio of the penetrant to the cyclohexenone compound is 0-10:1, for example 0:1, 0.5:1, 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, or any range between the two, preferably 0.5-5:1.

[0049] According to the present invention, preferably, the penetrant is selected from at least one of 1-dodecylazacycloheptane-2-one, 1-geranylazacycloheptane-2-one, 5-propylazacycloheptane-2-one, 5,5-dimethylazacycloheptane-2-one, 1-benzylazacycloheptane-2-one, and 5-ethylazacycloheptane-2-one, and more preferably from at least one of 1-dodecylazacycloheptane-2-one, 1-geranylazacycloheptane-2-one, and 5-propylazacycloheptane-2-one.

[0050] According to the present invention, the thin oil has the conventional meaning in the art, referring to an oil product with low viscosity and good fluidity. Preferably, the thin oil is selected from at least one of catalytic cracking slurry oil, catalytic diesel oil, and thin diesel oil, and more preferably catalytic cracking slurry oil and / or catalytic diesel oil.

[0051] In this invention, light oil is used as a solvent, achieving efficient utilization of byproducts from catalytic cracking units and increasing product added value. The oil-soluble viscosity reducer provided in this invention has a good viscosity-reducing effect, effectively improving the fluidity of heavy oil. It has the advantages of low energy consumption, saving light oil resources, and easy contact with heavy oil, and there are no post-processing problems, making it easy to promote and use.

[0052] According to the present invention, preferably, the API gravity of the light oil is >32, more preferably 55-75. In the present invention, the API gravity has the conventional interpretation in the art, used to measure the density of crude oil, API gravity = (141.5 / relative density) - 131.5, where the relative density is the density of crude oil measured at a standard temperature (15.6°C).

[0053] According to the present invention, preferably, the solid particulate matter content of the thin oil is less than 10,000 μg / g, more preferably 1,000-8,000 μg / g. In the present invention, the solid particulate matter refers to impurity particles in the thin oil.

[0054] According to the present invention, preferably, the dynamic viscosity of the thin oil at a temperature of 50°C is ≤70 mPa·s, and more preferably 5-50 mPa·s.

[0055] In this invention, the dynamic viscosity of the thin oil at 50°C is measured using a rheometer.

[0056] In this invention, preferably, a mixture of light oil meeting the above conditions and cyclohexenone compounds is used to obtain an oil-soluble viscosity reducer composition, which can more effectively reduce the viscosity of heavy oil and enhance the dispersibility of heavy oil. No further post-processing of the viscosity reducer composition is required, making it easy to promote and use, while also increasing the added value of light oil.

[0057] A second aspect of the present invention provides a method for preparing the viscosity-reducing composition of the first aspect, wherein the preparation method includes the following steps:

[0058] The viscosity reducer composition is obtained by mixing a cyclohexenone compound, a thin oil, and an optional penetrant.

[0059] In this invention, unless otherwise specified, "optional" means containing or not containing, adding or not adding, or using or not using. Specifically, this invention may or may not contain a penetrant.

[0060] According to the present invention, preferably, the mixing conditions are not particularly limited, and it is sufficient to uniformly mix the cyclohexenone compound, the thin oil, and optionally the penetrant. According to a preferred embodiment of the present invention, the mixing conditions include: a mixing temperature of 10-80°C, preferably 35-55°C; and a mixing time of 10-360 min, preferably 30-60 min.

[0061] According to the present invention, preferably, the mixing is carried out under stirring conditions, and the stirring rate is 80-500 rpm, preferably 100-200 rpm.

[0062] In this invention, the mixing equipment is not particularly limited, as long as it can achieve uniform mixing. According to a preferred embodiment of the invention, a cyclohexenone compound, a thin oil, and optionally a penetrant are mixed in a reaction vessel to obtain the viscosity reducer composition.

[0063] The third aspect of the present invention provides the application of the viscosity-reducing composition described in the first aspect in the exploitation and / or gathering and transportation of heavy oil reservoirs.

[0064] The viscosity-reducing composition provided by this invention has a simple preparation process and is suitable for industrial production. The substances required for preparing the viscosity-reducing composition do not require further purification, and it has broad application prospects in the crude oil extraction field. The viscosity-reducing composition efficiently utilizes byproducts from catalytic cracking units, increasing product added value and contributing to cost reduction and efficiency improvement in crude oil extraction.

[0065] A fourth aspect of the present invention provides a method for reducing the viscosity of heavy oil, the method comprising: contacting and reacting the viscosity-reducing composition described in the first aspect with heavy oil;

[0066] The mass ratio of the viscosity-reducing composition to the heavy oil is 1:10-200, preferably 1:10-50.

[0067] In this invention, the method for reducing the viscosity of heavy oil involves contacting a small amount of the viscosity-reducing composition described in the first aspect with the heavy oil, which can effectively reduce the viscosity of the heavy oil. Adding 3-10 wt% of the viscosity-reducing composition can achieve a viscosity reduction rate of over 60% for the heavy oil. The viscosity reduction method is simple to operate, can effectively improve the fluidity of heavy oil, ensure the exploitation and transportation of heavy oil reservoirs, and achieve cost reduction and efficiency improvement in the exploitation of heavy oil reservoirs.

[0068] According to the present invention, preferably, the dynamic viscosity of the heavy oil at 50°C is ≥100 mPa·s, and more preferably, the dynamic viscosity at 50°C is 10000-100000 mPa·s.

[0069] According to the present invention, the conditions for the contact reaction are not particularly limited, as long as the effect of reducing the viscosity of heavy oil is achieved. Preferably, the conditions for the contact reaction include: a contact reaction temperature of 20-100°C, more preferably 50-70°C; and a contact reaction time of 0.5-6 hours, more preferably 1-4 hours. Under the above conditions, the viscosity-reducing composition is contacted with heavy oil, and the viscosity-reducing composition and heavy oil are uniformly mixed and fully contacted. The cyclohexenone compounds in the viscosity-reducing composition are better dissolved and dispersed in the heavy oil, resulting in a good viscosity-reducing effect.

[0070] According to a particularly preferred embodiment of the present invention, a viscosity-reducing composition comprises, based on the total amount of the viscosity-reducing composition, a cyclohexenone compound and a thin oil;

[0071] The mass ratio of the cyclohexenone compound to the dilute oil is 0.2-0.5:1.

[0072] The cyclohexenone compounds are selected from at least one of methylcyclohexenone, 3,5,5-trimethyl-2-cyclohexen-1-one, ethylcyclohexenone, and 3-methyl-5-propyl-2-cyclohexen-1-one;

[0073] The viscosity-reducing composition further includes a penetrant, wherein the mass ratio of the penetrant to the cyclohexenone compound is 0.5-5:1;

[0074] The penetrant is selected from at least one of 1-dodecylazacycloheptane-2-one, 1-geranylazacycloheptane-2-one, and 5-propylazacycloheptane-2-one.

[0075] The present invention will be described in detail below through examples and comparative examples. Unless otherwise specified, all reagents used in the following examples and comparative examples are commercially available.

[0076] In the following examples and comparative examples, the dynamic viscosity of the tower-type catalytic cracking slurry at 50°C was 10.6 mPa·s, the API gravity was 60, and the solid particulate matter content was 4000 μg / g.

[0077] The catalytic diesel oil produced by Zhenhai Refining & Chemical has a dynamic viscosity of 10.4 mPa·s at 50℃, an API strength of 55, and a particulate matter content of 2000 μg / g.

[0078] The light diesel oil has a dynamic viscosity of 8.2 mPa·s at 50℃, an API gravity of 65, and a particulate matter content of 1000 μg / g.

[0079] Example 1

[0080] Preparation of viscosity reducing agent composition: 15g of 3,5,5-trimethyl-2-cyclohexen-1-one (Sigma-Aldrich) and 10g of 1-dodecylazacycloheptan-2-one (Innochem, AR, >99%) were added to 50g of catalytic cracking slurry (a fraction obtained from the catalytic cracking unit of the tower chemical refinery), and dissolved by stirring at 50°C for 30 minutes at a stirring rate of 200 rpm to obtain viscosity reducing agent composition A1.

[0081] Example 2

[0082] Preparation of viscosity reducing agent composition: 10g of methylcyclohexenone (purchased from Innochem) and 10g of 1-dodecylazacycloheptan-2-one (Innochem, AR, >99%) were added to 50g of tower catalytic cracking slurry and dissolved by stirring at 50°C for 30 minutes at a stirring rate of 200 rpm to obtain viscosity reducing agent composition A2.

[0083] Example 3

[0084] Preparation of viscosity reducing agent composition: 10g of 3-methyl-5-propyl-2-cyclohexen-1-one (purchased from Innochem, AR) and 10g of 1-dodecylazacycloheptan-2-one (Innochem, AR, >99%) were added to 50g of tower catalytic cracking slurry and dissolved by stirring at 50°C for 30 minutes at a stirring rate of 200 rpm to obtain viscosity reducing agent composition A3.

[0085] Example 4

[0086] Preparation of viscosity reducing agent composition: 20g of 3,5,5-trimethyl-2-cyclohexen-1-one (Beijing Guoyao Reagent Group, chemically pure) and 10g of 1-dodecylazacycloheptan-2-one (Innochem, AR, >99%) were added to 50g of Zhenhai Refining & Chemical catalytic diesel (fraction with initial boiling point >200℃ of Zhenhai Refining & Chemical catalytic unit). The mixture was stirred at 25℃ for 40 minutes at a stirring rate of 200 rpm to dissolve, thus obtaining viscosity reducing agent composition A4.

[0087] Example 5

[0088] Preparation of viscosity reducing agent composition: 15g of methylcyclohexenone (purchased from Exxon Paraflow brand) and 10g of 1-dodecylazacycloheptan-2-one (Innochem, AR, >99%) were added to 50g of Zhenhai Refining & Chemical catalytic diesel oil and dissolved by stirring at 25°C for 40 minutes at a stirring rate of 200rpm to obtain viscosity reducing agent composition A5.

[0089] Example 6

[0090] Preparation of viscosity reducing agent composition: 10g of 3,5,5-trimethyl-2-cyclohexen-1-one and 10g of 1-geranylazacycloheptan-2-one (TCI, 98%) were added to 50g of light diesel oil and stirred at 50°C for 60 minutes to dissolve, with a stirring speed of 200 rpm, to obtain viscosity reducing agent composition A6.

[0091] Example 7

[0092] Preparation of viscosity reducing agent composition: 3g of 3,5,5-trimethyl-2-cyclohexen-1-one and 10g of 1-geranylazacycloheptan-2-one (TCI, 98%) were added to 50g of light diesel oil and stirred at 50°C for 60 minutes to dissolve, with a stirring speed of 200 rpm, to obtain viscosity reducing agent composition A7.

[0093] Example 8

[0094] Preparation of viscosity reducer composition: 15g of 3,5,5-trimethyl-2-cyclohexen-1-one (Sigma-Aldrich) was added to 50g of catalytic cracking slurry (a fraction obtained from the catalytic cracking unit of the tower chemical refinery), and stirred at 50°C for 30 minutes to dissolve it, with a stirring rate of 200rpm, to obtain viscosity reducer composition A8.

[0095] Example 9

[0096] Preparation of viscosity reducing agent composition: 15g of dodecyl-2-cyclohexene-1-one and 10g of 1-dodecylazacycloheptan-2-one (Innochem, AR, >99%) were added to 50g of tower catalytic cracking slurry and dissolved by stirring at 50°C for 30 minutes at a stirring rate of 200 rpm to obtain viscosity reducing agent composition A9.

[0097] Example 10

[0098] Preparation of viscosity reducer composition: 15g of 3,5,5-trimethyl-2-cyclohexen-1-one (Sigma-Aldrich) and 10g of 1-ethylazacycloheptan-2-one (Innochem, AR, >99%) were added to 50g of tower catalytic cracking slurry and dissolved by stirring at 50°C for 30 minutes at a stirring rate of 200 rpm to obtain viscosity reducer composition A10.

[0099] Example 11

[0100] Preparation of viscosity reducing agent composition: 15g of 3,5,5-trimethyl-2-cyclohexen-1-one (Sigma-Aldrich) and 10g of 1-dodecylazacycloheptan-2-one (Innochem, AR, >99%) were added to 50g of light crude oil (crude oil viscosity was 100mPa·s) to obtain viscosity reducing agent composition A11.

[0101] Comparative Example 1

[0102] Preparation of viscosity reducing agent composition: 20g of 3,5,5-trimethyl-2-cyclohexen-1-one (Sigma-Aldrich) was dissolved by stirring at 50°C for 30 minutes at a stirring rate of 200rpm to obtain viscosity reducing agent composition B1.

[0103] Comparative Example 2

[0104] Preparation of viscosity-reducing composition: 1-Dodecylazacycloheptan-2-one (Innochem, AR, >99%)

[0105] 20g of the solution was dissolved by stirring at 50°C for 30 minutes at a stirring rate of 200 rpm to obtain viscosity reducer composition B2.

[0106] Comparative Example 3

[0107] Preparation of viscosity reducer composition: 20g of tower catalytic cracking oil slurry was dissolved by stirring at 50℃ for 30 minutes at a stirring rate of 200rpm to obtain viscosity reducer composition B3.

[0108] Test case

[0109] (1) The viscosity reduction rate of the viscosity reducing agent composition on heavy oil A in Zhongyuan Oilfield was tested. The viscosity of heavy oil A in Zhongyuan Oilfield was 18040 mPa·s at 50℃.

[0110] The experimental procedure is as follows: Take 20g of heavy oil A from the oilfield, add 3wt% of the viscosity-reducing composition from the examples or comparative examples, stir evenly, and react at 50℃ for 1h. Use a rheometer to test the viscosity Q of the heavy oil at 50℃ after adding the viscosity-reducing composition, in mPa·s.

[0111] The viscosity reduction rate is calculated using the following formula: Viscosity reduction rate = (18040-Q) / 18040×100%, and the results are shown in Table 1.

[0112] (2) At the same time, the viscosity-reduced mixed oil was aged at 90°C for 15 days, and the stability of the mixed oil phase was observed using a UV-550 microscope particle size analyzer. The results are shown in Table 1.

[0113] Table 1

[0114]

[0115] As can be seen from the results in Table 1, the viscosity-reducing composition provided in the embodiments of the present invention has a good viscosity-reducing effect. Adding a small amount of viscosity-reducing composition can improve the fluidity of heavy oil and significantly reduce the viscosity of heavy oil.

[0116] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A viscosity-reducing composition, characterized in that, Based on the total amount of the viscosity-reducing composition, the composition comprises cyclohexenone compounds and thin oil; The mass ratio of the cyclohexenone compound to the dilute oil is 0.01-1:

1.

2. The viscosity-reducing composition according to claim 1, wherein, The cyclohexenone compounds have structures as shown in formula (I) and / or formula (II): Wherein, R1 is H or a C1-C25 alkyl group; R2 is H or a C1-C25 alkyl group; R3 and R4 are each independently H or a C1-C25 alkyl group; Preferably, R1 is an H or a C1-C7 alkyl group; Preferably, R2 is H or a C1-C10 alkyl group; Preferably, R3 and R4 are each independently an H or C1-C7 alkyl group; Preferably, the cyclohexenone compound is selected from at least one of methylcyclohexenone, 3,5,5-trimethyl-2-cyclohexen-1-one, ethylcyclohexenone, and 3-methyl-5-propyl-2-cyclohexen-1-one.

3. The viscosity-reducing composition according to claim 1 or 2, wherein, The mass ratio of the cyclohexenone compound to the light oil is 0.05-0.5:

1.

4. The viscosity-reducing composition according to any one of claims 1-3, wherein, The viscosity-reducing composition further includes a penetrant; Preferably, the penetrant has a structure as shown in formula (III) and / or formula (IV): Wherein, R5 is H or a C1-C17 alkyl group, preferably a C8-C12 alkyl group; R6 is H or a C1-C17 alkyl group, preferably a C8-C12 alkyl group; Preferably, the mass ratio of the penetrant to the cyclohexenone compound is 0-10:1, more preferably 0.5-5:

1.

5. The viscosity-reducing composition according to claim 4, wherein, The penetrant is selected from at least one of 1-dodecylazacycloheptane-2-one, 1-geranylazacycloheptane-2-one, 5-propylazacycloheptane-2-one, 5,5-dimethylazacycloheptane-2-one, 1-benzylazacycloheptane-2-one, and 5-ethylazacycloheptane-2-one.

6. The viscosity-reducing composition according to any one of claims 1-5, wherein, The light oil is selected from at least one of catalytic cracking slurry oil, catalytic diesel oil, and light diesel oil, preferably catalytic cracking slurry oil and / or catalytic diesel oil; Preferably, the API gravity of the thin oil is >32, and more preferably 55-75; Preferably, the particulate matter content of the thin oil is less than 10,000 μg / g, and more preferably 1,000-8,000 μg / g; Preferably, the dynamic viscosity of the thin oil at 50°C is ≤70 mPa·s, and more preferably 5-50 mPa·s.

7. A method for preparing the viscosity-reducing composition according to any one of claims 1-6, characterized in that, The preparation method includes the following steps: The viscosity reducer composition is obtained by mixing a cyclohexenone compound, a thin oil, and an optional penetrant.

8. The preparation method according to claim 7, wherein, The mixing conditions include: a mixing temperature of 10-80℃, preferably 35-55℃; and a mixing time of 10-360 min, preferably 30-60 min. Preferably, the mixing is carried out under stirring conditions, and the stirring rate is 80-500 rpm, preferably 100-200 rpm.

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

10. A method for reducing the viscosity of heavy oil, the method comprising: The viscosity-reducing composition according to any one of claims 1-6 is reacted with heavy oil; The mass ratio of the viscosity-reducing composition to the heavy oil is 1:10-200, preferably 1:10-50; Preferably, the dynamic viscosity of the heavy oil at 50°C is ≥100 mPa·s, and more preferably, the dynamic viscosity at 50°C is 10000-100000 mPa·s; Preferably, the conditions for the contact reaction include: a contact reaction temperature of 20-100℃, more preferably 50-70℃; and a contact reaction time of 0.5-6h, more preferably 1-4h.

Images