Thickened oil emulsification viscosity reducer composition and application

Abstract

The application discloses a thickened oil emulsification viscosity reducer composition, which comprises alkyl amide propyl hydroxyl sulfonic betaine, a quaternary ammonium salt compound containing a tertiary amine and a hydroxyl group, and water, wherein the content of the alkyl amide propyl hydroxyl sulfonic betaine is 10-40% and preferably 25-30% based on the total mass of the composition; the content of the quaternary ammonium salt compound containing the tertiary amine and the hydroxyl group is 3-15% and preferably 8-10%. The thickened oil emulsification viscosity reducer with strong foaming performance provided by the application can emulsify thickened oil to form an oil-in-water emulsion, so that the viscosity of the thickened oil is obviously reduced and the flowability of the thickened oil is improved; and the thickened oil emulsification viscosity reducer has good foaming performance and foam stability, can effectively plug high-permeability channels, reduce the degree of water channeling, improve the sweeping coefficient of the viscosity reducer, and thus improve the recovery rate of thickened oil.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of oil and gas field exploitation, and particularly relates to a heavy oil emulsification viscosity reducer composition with strong foaming performance and application. BACKGROUND

[0002] The heavy oil reservoirs in China are seriously heterogeneous, have various types, and most of the buried depths are greater than 800 m, which is much higher than that of foreign oil reservoirs. The heavy oil has high viscosity and poor flowability due to the stacking of molecules and the interaction of hydrogen bonds, which leads to a too high oil-water mobility ratio between the water phase and the heavy oil, and water channeling is prone to occur in the process of water injection development. The high viscosity and low mobility of the heavy oil make it more difficult to be displaced, and the low recovery efficiency of the oil reservoir leads to a rapid decline in production capacity. In order to reduce the difficulty of heavy oil exploitation, it is necessary to reduce the viscosity of the heavy oil, improve the mobility of the heavy oil, and improve the oil-water mobility ratio.

[0003] With the development of oil and gas fields into the middle and late stages, foam flooding, as one of the tertiary oil recovery technologies, has gradually become one of the effective methods for improving recovery efficiency. The foam has the characteristics of high viscosity, which can effectively improve the sweep efficiency and the recovery efficiency of the oil reservoir by plugging high-permeability layers and opening low-permeability layers. The addition of viscosity reducer molecules in the foaming agent can effectively reduce the viscosity of the heavy oil, improve the flowability of the heavy oil, adjust the water-oil mobility ratio, and improve the oil displacement efficiency, which can further improve the recovery efficiency of the oil reservoir on the basis of the original, and control the economic cost at the same time. Therefore, the foam flooding is applied to the heavy oil reservoir, so as to realize the dual effects of improving the sweep efficiency and improving the oil displacement efficiency, which is of great significance to the efficient development of the heavy oil reservoir.

[0004] For the heavy oil reservoir, reducing the viscosity of the heavy oil, improving the oil-water mobility ratio, and improving the sweep efficiency are the key technologies and approaches to greatly improving the development effect of the heavy oil. Under the premise of ensuring that the chemical agent has good emulsification viscosity reduction performance, the heavy oil emulsification viscosity reducer with strong foaming performance is developed from the foaming performance, and the application of the heavy oil plugging, adjusting, viscosity reducing and oil displacement integrated technology in the heavy oil reservoir is researched. SUMMARY

[0005] To solve the above problems, the present application provides a heavy oil emulsification viscosity reducer composition and application thereof.

[0006] The present application provides a heavy oil emulsification viscosity reducer composition, which comprises alkyl amide propyl hydroxyl sulfonic betaine, a quaternary ammonium salt compound containing a tertiary amine and a hydroxyl group, and water. The content of the alkyl amide propyl hydroxyl sulfonic betaine is 10%-40%, preferably 25%-30%, based on 100% of the total mass of the composition; the content of the quaternary ammonium salt compound containing a tertiary amine and a hydroxyl group is 3%-15%, preferably 8%-10%.

[0007] According to an embodiment of the present application, the structure of the alkyl amide propyl hydroxyl sulfonic betaine is as follows:

[0008] Formula 1:

[0009]

[0010] wherein R is any one of C6-C 24 alkyl, alkenyl, preferably C8-C 20 alkyl, most preferably n-C 10 -C 16 alkyl.

[0011] According to another embodiment of the present application, the quaternary ammonium salt compound containing tertiary amine and hydroxyl group has a structure as shown in Formula 2:

[0012]

[0013] wherein group R1 is any one of C 4-28 alkyl, alkenyl, preferably C 12-18 alkyl; R2 and R3 are each independently selected from CH3, C2H5, 1C3H7 or C4H9, preferably C2H5; X is Cl or Br.

[0014] According to another embodiment of the present application, the composition further comprises a foam stabilizer and / or a co-surfactant, wherein the content of the foam stabilizer is 0-10%, preferably 4%-6% of the total mass of the heavy oil emulsification viscosity reducer; the content of the co-surfactant is 0%-6%, preferably 3%-5% of the total mass of the heavy oil emulsification viscosity reducer.

[0015] According to another embodiment of the present application, the foam stabilizer is a fatty acid diethanolamide as shown in Formula 3:

[0016]

[0017] wherein R4 is provided by a C8-C 20 saturated fatty acid, a C8-C 20 vegetable oil fatty acid or a C8-C 20 petroleum naphthenic acid; preferably, the C8-C 20 vegetable oil fatty acid is provided by at least one of coconut oil acid, cotton oil acid, tall oil acid. Preferably, it is provided by a C 12 -C 18 normal saturated fatty acid or a C 12 -C 18 normal vegetable oil fatty acid.

[0018] According to another embodiment of the present application, the co-surfactant is an alcohol with a carbon number of 2-14, preferably one or more of n-heptanol, n-octanol, dodecanol.

[0019] The application further provides application of the thickened oil emulsification viscosity reducer composition in single-well huff and puff development of thickened oil reservoirs.

[0020] According to an embodiment of the application, the thickened oil emulsification viscosity reducer composition is combined with N2 or / and CO2 huff and puff.

[0021] According to another embodiment of the application, a certain mass fraction of the thickened oil emulsification viscosity reducer composition is injected into the oil well, preferably the mass fraction is 0.3%-5%, more preferably the mass fraction is 1%-3%, then a high-pressure N2 or / and CO2 slug is injected into the oil well, and then the well is soaked.

[0022] The application further provides application of the thickened oil emulsification viscosity reducer composition in chemical flooding of thickened oil reservoirs.

[0023] According to an embodiment of the application, a certain mass fraction of the thickened oil emulsification viscosity reducer composition is injected into the injection well in a pulse mode, preferably the mass fraction is 0.1%-3%, more preferably the mass fraction is 0.3%-1.5%, then a N2 or / and CO2 slug is injected into the injection well, and then water displacement is performed.

[0024] According to another embodiment of the application, the thickened oil emulsification viscosity reducer composition and N2 or CO2 are injected alternately in several slugs.

[0025] According to another embodiment of the application, the thickened oil emulsification viscosity reducer composition and a N2 or / and CO2 slug are injected into the injection well simultaneously, preferably the mass fraction of the viscosity reducer is 0.1%-3%, more preferably the mass fraction is 0.3%-1.5%.

[0026] According to another embodiment of the application, after the foam blocks the channeling channel, the injection of the N2 or / and CO2 slug is stopped, and the injection of the viscosity reducer solution is continued.

[0027] Compared with the prior art, the thickened oil emulsification viscosity reducer composition has the following advantages:

[0028] (1) The viscosity reducer composition of the application can quickly form a stable foam system with gas, adjust the water-oil mobility ratio, prevent water channeling, expand the swept area, and improve the development effect. The generation of a large amount of foam in the formation can increase the elastic capacity and improve the oil recovery efficiency.

[0029] (2) The viscosity reducer composition of the application can quickly form an oil-in-water emulsion under low shear, greatly reduce the viscosity of thickened oil, and improve the flowability of thickened oil.

[0030] (3) The viscosity reducer composition of the application can reduce the oil-water interfacial tension, improve the wettability of the pore wall, reduce the adhesion work of thickened oil on the pore wall, and improve the oil washing efficiency.

[0031] (4) The co-surfactant in the viscosity reducer composition of the present application can not only be adsorbed on the gas-liquid surface to stabilize the foam, but also can penetrate into the internal part of the heavy oil to weaken the hydrogen bond between the asphaltene colloidal aggregates, partially destroy the aggregate structure, reduce the viscosity of the heavy oil, and improve the flowability of the heavy oil.

[0032] (5) The viscosity reducer composition has the advantages of high temperature resistance and high salt resistance, and can be used in deep heavy oil, edge-bottom water heavy oil, heterogeneous low-permeability heavy oil, and heavy oil reservoirs under complex formation conditions. DETAILED DESCRIPTION

[0033] The endpoints of the ranges and any values disclosed herein are not limited to the precise values recited as the exact dimensions are not critical to the present application. Any numerical value, however, can be expressed as a range to include any and all expressed values between the end points, whether or not modifying language is used. For example, if the frame height is from 1 to 10, then explicit half-point values of 1.5, 2.5, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5, and 9.5 are not to be excluded from the range or the disclosed endpoints, even though only the integer values 1 through 10 can be expressly recited.

[0034] The heavy oil emulsification viscosity reducer composition of the present application comprises alkyl amide propyl hydroxyl sulfonic betaine, quaternary ammonium salt compound containing tertiary amine and hydroxyl, and water, wherein the content of alkyl amide propyl hydroxyl sulfonic betaine is 10% to 40%, preferably 25% to 30%, based on the total mass of the composition; the content of quaternary ammonium salt compound containing tertiary amine and hydroxyl is 3% to 15%, preferably 8% to 10%.

[0035] In an optional embodiment, the structure of the alkyl amide propyl hydroxyl sulfonic betaine is shown in formula 1:

[0036]

[0037] wherein R is any one of C6-C 24 alkyl, alkenyl, preferably C8-C 20 alkyl, and most preferably n-C 10 -C 16 alkyl.

[0038] The structure of the quaternary ammonium salt compound containing tertiary amine and hydroxyl is shown in formula 2:

[0039]

[0040] wherein the group R1 is any one of C 4-28 alkyl, alkenyl, preferably C 12-18 n-alkyl; R2 and R3 are each independently selected from CH3, C2H5, 1C3H7, or C4H9, preferably C2H5; and X is Cl or Br.

[0041] In an alternative embodiment, the composition further comprises a foam stabilizer and / or a co-surfactant. The content of the foam stabilizer is 0-10%, preferably 4%-6%, of the total mass of the heavy oil emulsification viscosity reducer. The content of the co-surfactant is 0%-6%, preferably 3%-5%, of the total mass of the heavy oil emulsification viscosity reducer.

[0042] The foam stabilizer is a fatty acid diethanolamide as shown in Formula 3:

[0043]

[0044] wherein R4 is provided by a C8-C 20 saturated fatty acid, a C8-C 20 vegetable oil fatty acid, or a C8-C 20 petroleum naphthenic acid; preferably, the C8-C 20 vegetable oil fatty acid is provided by at least one of coconut oil acid, cotton oil acid, or tall oil acid. Preferably, the C8-C 12 -C 18 normal saturated fatty acid or a C 12 -C 18 normal vegetable oil fatty acid.

[0045] The co-surfactant is an alcohol with a carbon number of 2-14, preferably one or more of n-heptanol, n-octanol, or dodecanol.

[0046] The heavy oil emulsification viscosity reducer composition of the present application can be prepared by any suitable method. For example, but not limited to: a certain amount of alkyl amido propyl hydroxyl sulfonate betaine, a quaternary ammonium salt compound containing a tertiary amine and a hydroxyl group, a foam stabilizer, a co-surfactant, and water are added into a reaction kettle respectively, and stirred uniformly to obtain a heavy oil emulsification viscosity reducer composition with strong foaming performance. Preferably, the mixing conditions at least meet: a temperature of 5-50°C, and a stirring time of 20-60 min.

[0047] The heavy oil emulsification viscosity reducer composition of the present application can be applied in single-well huff and puff production of heavy oil reservoirs. The heavy oil emulsification viscosity reducer composition is combined with N2 or / and CO2 huff and puff. First, a certain mass fraction of the viscosity reducer composition, preferably the mass fraction of the heavy oil emulsification viscosity reducer composition is 0.3%-5%, more preferably the mass fraction is 1%-3%, is injected into the oil well, then a high-pressure N2 or CO2 slug is injected into the oil well, and then the well is hatched. The mass fraction of the heavy oil emulsification viscosity reducer composition referred to in application refers to the mass percentage of the heavy oil emulsification viscosity reducer composition as a kind of substance in water, which has the same meaning hereinafter. The strong foaming performance of the viscosity reducer forms a foam system when it contacts with N2 or CO2 gas, which blocks high-permeability channels and improves the sweep efficiency of the viscosity reducer. The injected viscosity reducer forms an oil-in-water emulsion with heavy oil, which greatly reduces the viscosity of heavy oil and reduces the flow resistance of crude oil, thereby improving the recovery efficiency of the reservoir.

[0048] Two application methods of the heavy oil emulsification viscosity reducer composition of the present application in heavy oil reservoir chemical flooding.

[0049] The first application method is to inject a certain mass fraction of the viscosity reducer solution into the injection well, preferably with a viscosity reducer mass fraction of 0.1% to 3%, more preferably with a mass fraction of 0.3% to 1.5%, then inject a N2 or CO2 slug into the injection well, the viscosity reducer solution and N2 or CO2 can be injected alternately for several slugs, and then water flooding is carried out.

[0050] The second application method is to inject the viscosity reducer solution and N2 or CO2 into the injection well at the same time, preferably with a viscosity reducer mass fraction of 0.1% to 3%, more preferably with a mass fraction of 0.3% to 1.5%. Preferably, the second application method further comprises the following steps: after the foam plugs the channeling channel, stop injecting N2 or CO2, and continue to inject the viscosity reducer solution, so that after plugging the channeling channel, the viscosity reducer solution can enter the non-channeling channel and improve the flowability by its emulsification viscosity reduction function. The above steps are repeated until the development is completed. The purpose is to fully foam the viscosity reducer solution and N2 or CO2 in the formation, and to improve the development effect of the heavy oil reservoir by recycling the plugging and adjusting effect of the foam and the viscosity reduction effect of the viscosity reducer on the heavy oil.

[0051] The inventive concept of the present application will be explained in detail in combination with the following examples. In the following examples, the reagents used are commercially available chemical reagents, which are not particularly limited.

[0052] Some of the raw materials used in the preparation examples, examples and comparative examples are shown in Table 1:

[0053] Table 1

[0054] Product name Factory Purity Dodecyl amido propyl hydroxy sultaine Guangdong Wengjiang Chemical Reagent Co., Ltd. >95％ Cocamido propyl hydroxy sultaine Guangdong Wengjiang Chemical Reagent Co., Ltd. >95％ Lauryl diethanolamide Inokai >99％ Cocamide diethanolamide Hubei Xirunde Chemical Co., Ltd. >95％ Octanol Inokai >99％ Dodecanol Inokai >99％ Diethylamine Inokai >99％ Dodecyl dimethyl tertiary amine Inokai >95％ Hexadecyl dimethyl tertiary amine Inokai >95％ Epichlorohydrin Inokai >99％

[0055] Preparation Example 1

[0056] The quaternary ammonium salt containing a tertiary amine and a hydroxyl group described in Formula 2 is referred to as J-1 when R1 is n-dodecyl and R2 and R3 are both ethyl. The synthesis reaction process of J-1 is as follows:

[0057]

[0058] The specific synthesis steps are as follows: 0.2 ml of diethylamine is placed in a 500 mL three-necked flask, stirred and slowly added with 100 ml of 2 mol / L hydrochloric acid solution. Then 0.2 mol of epichlorohydrin is added, and the dropping speed is 3-5 seconds / drop. Then 80 mL of distilled water is added. The reaction is continued at 60°C for 6 hours to obtain a light yellow mixture. The pH value of the mixture is adjusted to 6.1 with hydrochloric acid. 0.2 mol of dodecyl dimethyl tertiary amine is continuously added. The reaction is continued at 85°C for 5 hours. The solvent in the product is removed by a rotary evaporator. The solid is washed with n-hexane three times, and recrystallized with acetone three to five times to obtain a white solid. Compound J-1 is obtained.

[0059] Preparation Example 2

[0060] The quaternary ammonium salt containing tertiary amine and hydroxyl group described by formula 2 is simply referred to as J-2 when R1 is n-hexadecyl, and R2 and R3 are both propyl. The specific synthesis steps are as follows: 0.2 ml of dipropylamine is placed in a 500 mL three-necked flask, stirred and slowly added with 100 ml of 2 mol / L hydrochloric acid solution. Then 0.2 mol of epichlorohydrin is added, and the dropping speed is 3-5 seconds / drop. Then 90 mL of distilled water is added. The reaction is continued at 65°C for 5 hours to obtain a light yellow mixture. The pH value of the mixture is adjusted to 6.0 with hydrochloric acid. 0.2 mol of hexadecyl dimethyl tertiary amine is continuously added. The reaction is continued at 90°C for 4 hours. The solvent in the product is removed by a rotary evaporator. The solid is washed with n-hexane three times, and recrystallized with acetone three to five times to obtain a white solid. Compound J-2 is obtained.

[0061] The compound J-1, J-2 prepared by Preparation 1-2 is used to prepare a thick oil emulsification viscosity reducer composition. "Per weight part" in the following examples means 0.5 g.

[0062] Example 1

[0063] At 40°C, 30 parts by weight of dodecyl amido propyl hydroxyl sultaine, 10 parts by weight of J-1, 6 parts by weight of lauric acid diethanol amide, 4 parts by weight of dodecanol, and 50 parts by weight of water are added to a reaction kettle, stirred for 40 min, to prepare a thick oil emulsification viscosity reducer composition with strong foaming performance, numbered PRJ-1.

[0064] Example 2

[0065] At 20°C, 30 parts by weight of cocamide propyl hydroxyl sultaine, 10 parts by weight of J-2, 6 parts by weight of lauric acid diethanol amide, 4 parts by weight of octanol, and 50 parts by weight of water are added to a reaction kettle, stirred for 30 min, to prepare a thick oil emulsification viscosity reducer composition with strong foaming performance, numbered PRJ-2.

[0066] Example 3

[0067] At 30°C, 25 parts by weight of cocamidopropyl hydroxysultaine, 8 parts by weight of J-2, 6 parts by weight of cocoyl diethanolamide, 5 parts by weight of dodecanol, and 56 parts by weight of water were added to a reaction kettle, stirred for 40 min, to produce a thick oil emulsion viscosity reducer composition with strong foaming performance, numbered PRJ-3.

[0068] Example 4

[0069] At 30°C, 25 parts by weight of cocamidopropyl hydroxysultaine, 8 parts by weight of J-2, 6 parts by weight of cocoyl diethanolamide, 5 parts by weight of dodecanol, and 56 parts by weight of water were added to a reaction kettle, stirred for 40 min, to produce a thick oil emulsion viscosity reducer composition with strong foaming performance, numbered PRJ-3.

[0070] Example 5

[0071] At 15°C, 30 parts by weight of cocamidopropyl hydroxysultaine, 10 parts by weight of J-1, 6 parts by weight of cocoyl diethanolamide, and 54 parts by weight of water were added to a reaction kettle, stirred for 20 min, to produce a thick oil emulsion viscosity reducer composition with strong foaming performance, numbered PRJ-5.

[0072] Example 6

[0073] At 45°C, 30 parts by weight of cocamidopropyl hydroxysultaine, 10 parts by weight of J-2, 5 parts by weight of dodecanol, and 55 parts by weight of water were added to a reaction kettle, stirred for 20 min, to produce a thick oil emulsion viscosity reducer composition with strong foaming performance, numbered PRJ-6.

[0074] Example 7

[0075] At 20°C, 10 parts by weight of cocamidopropyl hydroxysultaine, 3 parts by weight of J-1, 4 parts by weight of cocoyl diethanolamide, 3 parts by weight of octanol, and 80 parts by weight of water were added to a reaction kettle, stirred for 20 min, to produce a thick oil emulsion viscosity reducer composition with strong foaming performance, numbered PRJ-7.

[0076] Example 8

[0077] At 40°C, 40 parts by weight of cocamidopropyl hydroxysultaine, 15 parts by weight of J-1, 10 parts by weight of cocoyl diethanolamide, 6 parts by weight of octanol, and 29 parts by weight of water were added to a reaction kettle, stirred for 60 min, to produce a thick oil emulsion viscosity reducer composition with strong foaming performance, numbered PRJ-8.

[0078] Example 9

[0079] At 40°C, 40 parts by weight of dodecyl amidopropyl hydroxysultaine, 3 parts by weight of J-1, 4 parts by weight of lauric acid diethanolamide, 3 parts by weight of octanol, and 50 parts by weight of water were added to a reaction kettle, stirred for 60 min, to produce a thick oil emulsification viscosity reducer composition with strong foaming performance, numbered PRJ-9.

[0080] Comparative Example 1

[0081] At 20°C, 50 parts by weight of dodecyl amidopropyl hydroxysultaine and 50 parts by weight of water were added to a reaction kettle, stirred for 30 min, to produce a viscosity reducer, numbered DB-1.

[0082] Comparative Example 2

[0083] At 20°C, 50 parts by weight of J-1 and 50 parts by weight of water were added to a reaction kettle, stirred for 30 min, to produce a viscosity reducer, numbered DB-2.

[0084] Comparative Example 3

[0085] At 20°C, 50 parts by weight of J-2 and 50 parts by weight of water were added to a reaction kettle, stirred for 30 min, to produce a viscosity reducer, numbered DB-3.

[0086] Comparative Example 4

[0087] A thick oil viscosity reducer industrial product used in a certain oilfield site, numbered DB-4.

[0088] Test Example 1

[0089] Viscosity reduction rate evaluation: A viscosity reducer solution with a mass fraction of 1% was prepared using formation water from a certain formation in the Shengli oilfield, and the formation water had a salinity of 8635 mg / L. A certain thick oil from the Shengli oilfield was used, and the viscosity of the thick oil was 2521 mPa·s at 50°C. A 20-gram sample of the thick oil was placed in a distillation flask; 10 grams of the viscosity reducer solution with a mass fraction of 1% from the example was added to the distillation flask; the mixture was stirred and mixed at 50°C; the viscosity of the mixture was measured at 50°C using a rheometer; and the viscosity reduction rate was calculated.

[0090] Test Example 2

[0091] Foaming performance and foam stability evaluation: the foaming height and half-life of the viscosity reducer composition are determined by Ross-mils method. The specific steps are as follows: a viscosity reducer solution with a mass fraction of 1% is prepared by using formation water in Shengli oilfield, and the formation water has a salinity of 8635 mg / L. At 50℃, 200 mL of the viscosity reducer solution is allowed to flow freely in a dropping tube to impact 50 mL of the viscosity reducer solution in a graduated cylinder, and the foaming height and the time for 50% of the foam to disappear are recorded.

[0092] The test results of the viscosity reduction rate, foaming height and half-life are shown in Table 2.

[0093] Table 2: Performance test results of different viscosity reducer compositions

[0094]

[0095] It can be seen that the thickened oil emulsification viscosity reducer composition provided by the present application can significantly improve the viscosity reduction rate, foaming height and half-life of a single compound, can significantly reduce the viscosity of thickened oil, and has strong foaming performance and foam stability.

[0096] The preferred embodiments of the present application are described in detail above, but the present application is not limited thereto. Within the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be considered as disclosed by the present application and fall within the protection scope of the present application.

Claims

1. A heavy oil emulsifying viscosity reducer composition characterized by, The composition comprises alkyl amide propyl hydroxyl sulfonate betaine, quaternary ammonium salt compound containing tertiary amine and hydroxyl, water, foam stabilizer and co-surfactant, the content of the alkyl amide propyl hydroxyl sulfonate betaine is 10%-40%, the content of the quaternary ammonium salt compound containing tertiary amine and hydroxyl is 3%-15%, the content of the foam stabilizer is greater than 0-10%, and the content of the co-surfactant is greater than 0%-6%, based on the total mass of the composition; The structure of the alkyl amide propyl hydroxyl sulfonate betaine is shown in formula 1: Formula 1 wherein R is any one of a C6to Cis alkyl group, an alkenyl group, 24 group, an alkenyl group, The structure of the quaternary ammonium salt compound containing tertiary amine and hydroxyl is shown in formula 2: Formula 2 wherein the group R1is C 4-28 Any one of alkyl, alkenyl; R2and R3are each independently selected from CH3, C2H5, C3H7or C4H9; X is Cl or Br; the foam stabilizer is a fatty acid diethanolamide of formula 3: Formula 3 Among them, R4 is composed of C8-C 20 Saturated fatty acids, C8-C 20 Vegetable oil fatty acids or C8-C 20 Petroleum naphthenic acids are provided; The co-surfactant is an alcohol with carbon number of 2-14.

2. The heavy oil emulsifying viscosity reducer composition of claim 1, wherein The content of the alkyl amide propyl hydroxyl sulfonate betaine is 25%-30%, and the content of the quaternary ammonium salt compound containing tertiary amine and hydroxyl is 8%-10%, based on the total mass of the composition.

3. The heavy oil emulsifying viscosity reducer composition of claim 1, wherein The content of the foam stabilizer is 4%-6%, and the content of the co-surfactant is 3%-5%, based on the total mass of the composition.

4. The heavy oil emulsifying viscosity reducer composition of claim 1, wherein R in said formula 1 is a C8-C 20 alkyl group.

5. The heavy oil emulsifying viscosity reducer composition of claim 4, wherein R in said formula 1 is C 10 ~ C 16 normal alkyl.

6. The heavy oil emulsifying viscosity reducer composition of claim 1, wherein The group R1in said formula 2 is C 12-18 n-alkyl.

7. The heavy oil emulsifying viscosity reducer composition of claim 1, wherein R4in said formula 3 is provided by coconut oil acid, cotton oil acid, tall oil acid, C 12 - C 18 normal saturated fatty acids or C 12 - C 18 normal vegetable oil fatty acids.

8. The heavy oil emulsifying viscosity reducer composition of claim 1, wherein The co-surfactant is one or more of n-heptanol, n-octanol and dodecanol.

9. Application of the heavy oil emulsification viscosity reducer composition in any one of claims 1-8 in single-well huff and puff development of heavy oil reservoirs.

10. Use according to claim 9, wherein the compound is ###0002### The heavy oil emulsification viscosity reducer composition is combined with N2 or CO2 huff and puff.

11. Use according to claim 9, wherein the compound is ###00009### A certain mass fraction of the heavy oil emulsification viscosity reducer composition is injected into an oil well, then a high-pressure N2 or / and CO2 slug is injected into the oil well, and then the well is soaked.

12. The use according to claim 9, wherein the compound is ###00006### A mass fraction of 0.3%-5% of the heavy oil emulsification viscosity reducer composition is injected into an oil well, then a high-pressure N2 or / and CO2 slug is injected into the oil well, and then the well is soaked.

13. The use according to claim 9, wherein the compound is ###0006### A mass fraction of 1%-3% of the heavy oil emulsification viscosity reducer composition is injected into an oil well, then a high-pressure N2 or / and CO2 slug is injected into the oil well, and then the well is soaked.

14. Application of the heavy oil emulsification viscosity reducer composition in any one of claims 1-8 in chemical flooding of heavy oil reservoirs.

15. The use according to claim 14, wherein the compound is ###00006### 15 A certain mass fraction of the heavy oil emulsification viscosity reducer composition is injected into an injection well in a pulse mode, then an N2 or / and CO2 slug is injected into the injection well, and then water is injected for displacement.

16. The use of claim 14, wherein, A mass fraction of 0.1%-3% of the heavy oil emulsification viscosity reducer composition is injected into an injection well in a pulse mode, then an N2 or / and CO2 slug is injected into the injection well, and then water is injected for displacement.

17. The use of claim 14, wherein the compound is ###00010### 14 A mass fraction of 0.3%-1.5% of the heavy oil emulsification viscosity reducer composition is injected into an injection well in a pulse mode, then an N2 or / and CO2 slug is injected into the injection well, and then water is injected for displacement.

18. The use of claim 15, wherein, The heavy oil emulsification viscosity reducer composition and N2 or CO2 are injected into the injection well in an alternating mode.

19. The use of claim 14, wherein, The heavy oil emulsification viscosity reducer composition and N2 or / and CO2 slug are injected into the injection well at the same time.

20. The use of claim 19, wherein, The mass fraction of the viscosity reducer is 0.1%-3%.

21. The use of claim 20, wherein, The mass fraction of the viscosity reducer is 0.3%-1.5%.

22. The use of claim 19, wherein the compound is ###00017### When the foam blocks the channeling channel, the injection of the N2 or / and CO2 slug is stopped, and the injection of the viscosity reducer solution is continued.

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