Compound, preparation method and application thereof, and thickened oil recovery method

Abstract

The invention relates to the technical field of oilfield exploitation, and discloses a compound, a preparation method and application thereof, and a thickened oil exploitation method. Wherein the compound has a structure as shown in a formula I, in the formula I, R1 is selected from H, substituted or unsubstituted C1-C6 alkyl, R2 and R3 are independently selected from H, substituted or unsubstituted C1-C6 alkyl and substituted or unsubstituted C6-C12 aryl, M is selected from alkali metal, and the compound can be used as a viscosity reducer to be applied to thickened oil recovery and has the effects of high temperature resistance and good viscosity reduction effect.

Description

Technical Field

[0001] This invention relates to the field of oilfield extraction technology, specifically to a compound, its preparation method and application, and a method for heavy oil extraction. Background Technology

[0002] Existing heavy oil extraction methods include thermal and cold extraction. Thermal extraction consumes a large amount of energy and is costly, while cold extraction does not require heating and achieves viscosity reduction through chemical viscosity reducers, CO2 injection, the use of microorganisms, and external physical fields, and is becoming increasingly widely used. Heavy oil is characterized by high viscosity, high density, poor fluidity, temperature sensitivity, low content of light components, and high content of gums and asphaltenes. Studies have shown that crude oil viscosity must be below 400 mPa·s for extraction and transportation. Therefore, the core issue in heavy oil extraction is how to effectively reduce the viscosity of crude oil and improve its fluidity.

[0003] Industrially used heavy oil viscosity reduction technologies include viscosity reduction by emulsifying with surfactant aqueous solutions, viscosity reduction by adding dilute crude oil, viscosity reduction by adding organic solvents (gasoline, diesel, light hydrocarbons, mixed benzene, etc.), viscosity reduction by adding oil-soluble viscosity reducers, and viscosity reduction by composite viscosity reducers. Among these, the most technically and economically valuable are viscosity reduction by water-soluble emulsifiers and viscosity reduction by oil-soluble viscosity reducers.

[0004] Heavy oil viscosity reducers must be thoroughly mixed with crude oil during use. Due to the limited permeability of the reservoir and the poor fluidity of the crude oil, mixing inside the reservoir is difficult. It is necessary to improve the fluidity of the crude oil within the reservoir. Heating is the main means of improving fluidity. However, due to the synthesis process and the characteristics of the reagents, ordinary viscosity reducers have poor high-temperature performance. Therefore, increasing the operating temperature of the viscosity reducer is crucial.

[0005] Water-soluble emulsification viscosity reduction technology, as the chemical viscosity reduction technology with the largest viscosity reduction range and the most economical use, has been widely used in various heavy oil fields in my country. Among them, the viscosity reduction effect is more obvious when used as an auxiliary viscosity reduction method in combination with thermal oil recovery such as steam huff and puff and steam drive.

[0006] In summary, in view of the shortcomings of existing viscosity reducers and market demand, there is an urgent need for a viscosity reducer, its preparation method and application. This viscosity reducer can not only solve the deficiencies of existing viscosity reducers at home and abroad, but also solve the problem of poor viscosity reduction effect of heavy oil under high temperature reservoir conditions. Summary of the Invention

[0007] The purpose of this invention is to overcome the problems of poor temperature resistance, weak emulsification and viscosity reduction ability, and the need for heating to reduce viscosity in existing viscosity reducers. This invention provides a compound, its preparation method and application, and a method for heavy oil extraction. This heavy oil agent not only has the advantages of good temperature resistance, good viscosity reduction effect, good natural sedimentation and dehydration performance, and resistance to viscosity rebound, but also has good water solubility, is green and low-carbon, and has a simple supporting injection process, making it suitable for practical applications in oil fields.

[0008] To achieve the above objectives, a first aspect of the present invention provides a compound having the structure shown in Formula I.

[0009]

[0010] In Formula I, R1 is selected from H, substituted or unsubstituted C1-C6 alkyl groups, and R2 and R3 are each independently selected from H, substituted or unsubstituted C1-C6 alkyl groups, substituted or unsubstituted C6-C6 alkyl groups. 12 Aromatic group, M is selected from alkali metal.

[0011] A second aspect of the present invention provides a method for preparing a compound, the method comprising: reacting an aqueous solution containing compound A and a methanol solution containing compound B in the presence of a catalyst in a non-oxidizing atmosphere, and obtaining the product as the compound;

[0012] Wherein, compound A and compound B have the structures shown in Formula II and Formula III, respectively;

[0013] R'2-C≡C-R'3(III)

[0014] In Formula II, R'1 is selected from H, substituted or unsubstituted C1-C6 alkyl groups, and M' is selected from alkali metals; in Formula III, R'2 and R'3 are each independently selected from H, substituted or unsubstituted C1-C6 alkyl groups, substituted or unsubstituted C6-C6 alkyl groups. 12 Aromatic group.

[0015] The third aspect of the present invention provides the application of the compound provided in the first aspect, or the compound obtained by the method provided in the second aspect, in the extraction, unblocking and transportation of heavy oil, preferably in the application of chemical viscosity reduction huff and puff and steam injection in high-temperature reservoirs.

[0016] A fourth aspect of the present invention provides a method for heavy oil extraction, the method comprising: contacting and mixing an aqueous solution of a compound with heavy oil to obtain a mixture containing heavy oil;

[0017] The compound in the aqueous solution is selected from the compound provided in the first aspect, or the compound prepared by the method provided in the second aspect.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] (1) The compound with the structure of Formula I provided by the present invention has strong temperature resistance, especially high temperature resistance up to 350℃; at the same time, the diene has strong lipophilic ability and can be stably embedded in the heavy components of heavy oil. The exposed sulfonate group binds the water phase around the oil phase through its strong hydrophilic properties, forming an oil-in-water emulsion, thereby improving the fluidity of heavy oil and achieving the effect of reducing viscosity.

[0020] (2) The compound provided by the present invention not only has the advantages of good viscosity reduction effect, good natural sedimentation and dehydration performance, and anti-viscosity rebound, but also has good water solubility, is green and low carbon, and has a simple supporting injection process, making it suitable for actual oilfield applications.

[0021] (3) The compound provided by the present invention is used in heavy oil extraction, which solves the problem of poor viscosity reduction effect of heavy oil under high temperature reservoir conditions, so that the viscosity reduction rate is ≥95%, and it can be used for both high temperature reservoir chemical viscosity reduction huff and puff and steam injection huff and puff. Attached Figure Description

[0022] Figure 1 This is the hydrogen NMR spectrum of product S1 obtained in Example 10 of this invention. Detailed Implementation

[0023] 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.

[0024] A first aspect of the present invention provides a compound having the structure shown in Formula I.

[0025]

[0026] In Formula I, R1 is selected from H, substituted or unsubstituted C1-C6 alkyl groups, and R2 and R3 are each independently selected from H, substituted or unsubstituted C1-C6 alkyl groups, substituted or unsubstituted C6-C6 alkyl groups. 12 Aromatic group, M is selected from alkali metal.

[0027] In this invention, unless otherwise specified, the viscosity reducer having the structure of Formula I is a 1,3-butadiene compound with strong temperature resistance; at the same time, the diene has strong lipophilic ability and can be stably embedded in the heavy components of heavy oil, while the exposed sulfonate group binds the aqueous phase around the oil phase through its strong hydrophilic properties, forming an oil-in-water emulsion, thereby improving the fluidity of heavy oil and achieving the effect of viscosity reduction.

[0028] In this invention, unless otherwise specified, substituted or unsubstituted C1-C6 alkyl groups include substituted C1-C6 alkyl groups and unsubstituted C1-C6 alkyl groups. In the substituted C1-C6 alkyl groups, the substituent groups are selected from methyl groups, heteroatoms (e.g., O, S, and N), halogens (e.g., F, Cl, Br, I), etc. Similarly, substituted or unsubstituted C6-C6 alkyl groups... 12 Aromatic groups include: substituted C6-C 12 Aromatic group, unsubstituted C6-C 12 Aromatic groups, wherein the substituted C6-C 12 The substituents in the aromatic group are selected from methyl, ethyl, heteroatoms (e.g., O, S and N), halogens (e.g., F, Cl, Br, I), etc.

[0029] In some embodiments of the present invention, preferably, in Formula I, R1 is selected from H, substituted or unsubstituted C1-C3 alkyl groups, and R2 and R3 are each independently selected from H, substituted or unsubstituted C1-C3 alkyl groups, substituted or unsubstituted C6-C3 alkyl groups. 10 Aromatic group, M is selected from Na or K.

[0030] In this invention, R2 and R3 in Formula I can be the same or different.

[0031] In some embodiments of the present invention, more preferably, in Formula I, R1 is selected from H, unsubstituted C1-C3 alkyl groups, and R2 and R3 are each independently selected from H, unsubstituted C1-C3 alkyl groups, substituted or unsubstituted C6-C3 alkyl groups. 10 Aromatic group.

[0032] In some embodiments of the present invention, more preferably, in Formula I, R1 is selected from H, methyl, ethyl, and R2 and R3 are each independently selected from H, methyl, ethyl, propyl, phenyl, benzyl, p-tolyl, o-tolyl, and m-tolyl.

[0033] In some embodiments of the present invention, most preferably, in Formula I, R1 is selected from H, methyl, ethyl, R2 is selected from H, methyl, ethyl, phenyl, and R3 is selected from H, methyl, ethyl, propyl, phenyl, benzyl, p-tolyl, o-tolyl, and m-tolyl.

[0034] In this invention, Formula I that satisfies the above-mentioned range is more conducive to improving the high temperature resistance and viscosity reduction of the compound.

[0035] According to the most preferred embodiment of the present invention, in Formula I, R1 is H, M is Na, and R2 and R3 are both phenyl.

[0036] In some embodiments of the present invention, the compound is resistant to high temperatures of 280-380°C, preferably 300-350°C.

[0037] In this invention, the compound can be obtained by reacting compound A and compound B in the presence of a catalyst. However, to further improve the yield of the compound, a second aspect of this invention provides a method for preparing the compound, the method comprising: reacting an aqueous solution containing compound A and a methanol solution containing compound B in the presence of a catalyst in a non-oxidizing atmosphere, and obtaining the product as the compound;

[0038] Wherein, compound A and compound B have the structures shown in Formula II and Formula III, respectively;

[0039] R'2-C≡C-R'3(III)

[0040] In Formula II, R'1 is selected from H, substituted or unsubstituted C1-C6 alkyl groups, and M' is selected from alkali metals; in Formula III, R'2 and R'3 are each independently selected from H, substituted or unsubstituted C1-C6 alkyl groups, substituted or unsubstituted C6-C6 alkyl groups. 12 Aromatic group.

[0041] In one specific embodiment of the present invention, compound A having the structure of formula II (i.e., 2-olefinamide-2-methyl-propanesulfonate) and compound B having the structure of formula III (i.e., alkyne compound) undergo a hydrocarbon-activated addition reaction in the presence of a catalyst to obtain a compound having the structure of formula I, as shown in the following reaction equation:

[0042]

[0043] In this invention, the non-oxidizing atmosphere is selected from nitrogen atmosphere, helium atmosphere, argon atmosphere and neon atmosphere, preferably argon atmosphere.

[0044] In some embodiments of the present invention, preferably, in Formula II, R'1 is selected from substituted or unsubstituted C1-C3 alkyl groups, and M' is selected from Na or K; more preferably, R'1 is selected from H or unsubstituted C1-C3 alkyl groups.

[0045] In some embodiments of the present invention, preferably, in Formula III, R'2 and R'3 are each independently selected from H, substituted or unsubstituted C1-C3 alkyl groups, substituted or unsubstituted C6-C4 alkyl groups. 10 Aromatic group; more preferably, R'2 and R'3 are each independently selected from unsubstituted C1-C3 alkyl groups, substituted or unsubstituted C6-C alkyl groups. 10Aromatic group; more preferably, R'2 and R'3 are each independently selected from H, methyl, ethyl, propyl, phenyl, benzyl, p-tolyl, o-tolyl, and m-tolyl.

[0046] In this invention, R'2 and R'3 in Formula III can be the same or different.

[0047] In some preferred embodiments of the present invention, preferably, in Formula III, R'2 is selected from H, methyl, ethyl, phenyl; R'3 is selected from H, methyl, ethyl, propyl, phenyl, benzyl, p-tolyl, o-tolyl, m-tolyl.

[0048] According to the most preferred embodiment of the present invention, in formulas II and III, R'1 is H, M is Na, and R'2 and R'3 are both phenyl.

[0049] In some embodiments of the present invention, the amount of compound A is 20-30 parts by weight, and the amount of compound B is 2.2-24 parts by weight.

[0050] In some embodiments of the present invention, preferably, the molar ratio of the aqueous solution containing compound A (calculated as compound A) to the methanol solution containing compound B (calculated as compound B) is 1:0.8-1.2.

[0051] In this invention, the aqueous solution containing compound A is composed of compound A and water; the methanol solution containing compound B is composed of compound B and methanol.

[0052] In some embodiments of the present invention, the weight ratio of compound A to water in the aqueous solution containing compound A is 20-30:80-100. That is, the amount of water used is 80-100 parts by weight relative to 20-30 parts by weight of compound A.

[0053] In some embodiments of the present invention, the weight ratio of compound B to methanol in the methanol solution containing compound B is 2.2-24:10-50. That is, the amount of methanol used is 10-50 parts by weight relative to 2.2-24 parts by weight of compound B.

[0054] In some embodiments of the present invention, the catalyst is selected from at least one of bis(1,5-cyclooctadiene) nickel, nickel acetylacetonate and ferric bromide, preferably bis(1,5-cyclooctadiene) nickel.

[0055] In some embodiments of the present invention, the mass ratio of the catalyst to compound A is 1-5:20-30.

[0056] In some embodiments of the present invention, preferably, the reaction conditions include: a temperature of 60-90°C, more preferably 65-75°C, and more preferably 70°C; and a time of 0.1-48h, more preferably 1-36h, and more preferably 24h.

[0057] The third aspect of the present invention provides the application of the compound provided in the first aspect, or the compound obtained by the method provided in the second aspect, in the extraction, unblocking and transportation of heavy oil, preferably in the application of chemical viscosity reduction huff and puff and steam injection in high-temperature reservoirs.

[0058] The compound provided by this invention has high temperature resistance and can be injected into the formation with steam, simplifying the injection and production process. It has a good viscosity reduction effect on ultra-deep heavy oil and extra-heavy oil. The product has good water solubility, is green and low-carbon, and has a simple supporting process, making it suitable for practical applications in oil fields.

[0059] A fourth aspect of the present invention provides a method for heavy oil extraction, the method comprising: contacting and mixing an aqueous solution of a compound with heavy oil to obtain a mixture containing heavy oil;

[0060] The compound in the aqueous solution is selected from the compound provided in the first aspect, or the compound prepared by the method provided in the second aspect.

[0061] In some embodiments of the present invention, preferably, the content of the compound in the aqueous solution is 0.1-3 wt%, for example, 0.1 wt%, 1 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, 3 wt%, and any value within the range of any two values, preferably 1-3 wt%.

[0062] In some embodiments of the present invention, preferably, the weight ratio of the aqueous solution of the compound to the heavy oil, calculated as a compound, is 0.4-2.5:1.

[0063] In a preferred embodiment of the present invention, the viscosity of the heavy oil at 50°C is 100-5000 mPa·s.

[0064] In this invention, viscosity is measured using a Brookfield DVIII rotational viscometer.

[0065] In this invention, the "viscosity" refers to the "deaerated viscosity", which is the viscosity measured after stirring the heavy oil to remove free water and air bubbles.

[0066] The present invention will be described in detail below through embodiments.

[0067] Example 1

[0068] (1) Dissolve 20g of compound A (in formula II, R'1 is selected from H and M' is selected from Na) in 80g of deionized water to obtain an aqueous solution containing compound A; dissolve 2.2g of compound B (in formula III, R'2 is selected from H and R'3 is selected from H) in 10g of methanol to obtain a methanol solution containing compound B;

[0069] (2) The aqueous solution containing compound A and the methanol solution containing compound B were added to a 250 mL round-bottom flask, a magnetic stirrer was added, and argon gas was passed through to remove oxygen for 1 h. Then, 1 g of bis(1,5-cyclooctadiene) nickel catalyst was added, and the reaction was carried out at 70 °C for 24 h. The reaction solution was cooled to 25 °C, concentrated, and then separated by silica gel column chromatography to obtain product S1 with the structure of formula I. In formula I, R1 is selected from H, M is selected from Na, and R2 and R3 are both selected from H.

[0070] The yield of the aforementioned product S1 was 97.8%.

[0071] Examples 2-4

[0072] Following the method of Example 1, except that in Examples 2-4, the amount of catalyst was changed according to the reaction parameters in Table 1, while the other conditions remained the same, to obtain products S2-S4.

[0073] Examples 5-6

[0074] The method of Example 1 was followed, except that in Examples 5-6, the concentrations of the aqueous solution containing compound A and / or the methanol solution containing compound B were changed according to the reaction parameters in Table 1, while the other conditions remained the same, to obtain products S5-S6.

[0075] Examples 7-8

[0076] Following the method of Example 1, except that in Examples 7-8, the amount and type of catalyst were changed according to the reaction parameters in Table 1, while the other conditions remained the same, to obtain products S7-S8.

[0077] Examples 9-14

[0078] Following the method of Example 1, except that Examples 9-14 were performed according to the reaction parameters in Table 1, with the other conditions remaining the same, to obtain products S9-S14.

[0079] Example 15

[0080] Following the method of Example 1, except that R'2 in compound B of Formula III was replaced with n-heptyl (n-C7), and the other conditions were the same, product D1 was obtained.

[0081] Example 16

[0082] Following the method of Example 1, except that R'1 in compound A of Formula II was replaced with tert-butyl (t-Bu), and the other conditions were the same, product D2 was obtained.

[0083] Table 1

[0084]

[0085]

[0086] Continued from Table 1

[0087]

[0088] As shown in Table 1, comparing Examples 1-4, using the same amounts of Compound A and Compound B, increasing the catalyst dosage from 1g to 5g only increases the yield from 97.8% to 98.3%, a mere 0.5% increase. Therefore, the present invention, using a catalyst dosage of 1-5 parts by weight, can further improve the product yield, i.e., increase the yield of the viscosity reducer.

[0089] Comparative examples 4-6 show that, using the same amount of catalyst, the yield slightly decreases when the concentrations of the aqueous solutions containing compound A and / or compound B decrease. Therefore, by controlling the concentrations of the aqueous solutions containing compound A and / or compound B within the preferred range of this invention, the product yield can be further improved.

[0090] Comparing Examples 1 and 7-8, it can be seen that Examples 7-8, using 5g of nickel acetylacetone and ferric bromide as catalysts, achieved yields of 97.3% and 97.6%, respectively, while Example 1, using 1g of bis(1,5-cyclooctadiene) nickel as a catalyst, achieved a yield as high as 97.8%. Therefore, using bis(1,5-cyclooctadiene) nickel as a catalyst can further improve the product yield.

[0091] Test Example 1

[0092] The chemical structures of the products obtained in the above examples were verified by characterization using proton nuclear magnetic resonance (NMR) spectroscopy. Specifically, the proton NMR spectrum of product S10 from Example 10 is shown below. Figure 1 As shown, 1 H NMR (500MHz, CDCl3): 1 H NMR (500MHz, CDCl3): δ = 2.23 (s, 3H), 6.32 (s, 1H), 6.66 (d, J = 1.0Hz, 1H), 6.79 (d, J = 7.5Hz, 1H), 7.05(t,J=8.0Hz,2H),7.21-7.15(m,5H),7.29-7.26(m,5H),7.69(d,J=8.5Hz,2H),8.72(s,1H).

[0093] According to Sinopec's enterprise standard "Q / SHCG 65-2013 Technical Requirements for Heavy Oil Viscosity Reducers", the products obtained in Examples 1, 9-14 and Comparative Examples 1-2 were used as viscosity reducers. A 1 wt% aqueous solution of the viscosity reducer was prepared. The viscosity reduction test was conducted on heavy oils a, b, c, d and e with degassing viscosities of 243 mPa·s, 1510 mPa·s, 2700 mPa·s, 3651 mPa·s and 4889 mPa·s respectively at a weight ratio of 3:7. The viscosity reduction results are shown in Table 2.

[0094] Table 2

[0095]

[0096]

[0097] Continued from Table 2

[0098]

[0099] As shown in Table 2, when the viscosity of heavy oil is below 1000 mPa·s, the potassium salt exhibits stronger polarity and a better emulsification and viscosity reduction effect. With increasing heavy oil viscosity, the viscosity reduction effect is significantly higher when R2 and R3 are phenyl groups, achieving effective viscosity reduction for heavy oil. The product S10 obtained in Example 10 shows the best overall viscosity reduction performance. The viscosity reduction effects of the products in Comparative Examples 1 and 2 are significantly lower than those in Examples 1-14, and their viscosity reduction performance decreases with increasing crude oil viscosity.

[0100] Test Example 2

[0101] The product S10 obtained in Example 10 was prepared into aqueous solutions with concentrations of 1 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, and 3 wt%, respectively. The viscosity reduction test was conducted on heavy oils a, b, c, d, and e, which had degassed viscosities of 243 mPa·s, 1510 mPa·s, 2700 mPa·s, 3651 mPa·s, and 4889 mPa·s, respectively, at 25°C, according to a drug-oil weight ratio of 3:7. The viscosity reduction results are shown in Table 3.

[0102] Table 3

[0103]

[0104] As shown in Table 3, the viscosity reduction rate increases with the increase of viscosity reducer concentration. Taking product S10 as an example, the viscosity reduction rate remained basically stable when the viscosity reducer concentration increased from 1 wt% to 3 wt%. Therefore, at the highest concentration of 3 wt%, the viscosity reduction rate remained above 98%.

[0105] Test Example 3

[0106] The product S10 obtained in Example 10 was prepared into an aqueous solution with a concentration of 3 wt%, and aged under sealed heating at 350°C for 5, 7, 15, 30, and 45 days. According to the agent-oil weight ratio of 3:7, viscosity reduction tests were conducted on heavy oils a, b, c, d, and e with degassing viscosities of 243 mPa·s, 1510 mPa·s, 2700 mPa·s, 3651 mPa·s, and 4889 mPa·s, respectively, at 25°C. The viscosity reduction results are shown in Table 4.

[0107] Table 4

[0108]

[0109]

[0110] As shown in Table 4, after heating and aging product S10 at 350℃ for 7 days, its viscosity-reducing performance remained basically unchanged. After heating for 45 days, the viscosity reduction rate for heavy oil a decreased by a maximum of 2%, but still remained above 96.5%, demonstrating good viscosity-reducing performance.

[0111] Test Example 4

[0112] The product S10 obtained in Example 10 was prepared into an aqueous solution with a concentration of 3 wt%, and aged in a sealed environment at 280°C, 300°C, 330°C and 380°C for 45 days. The viscosity reduction test was carried out on heavy oil a with a degassing viscosity of 243 mPa·s at 25°C according to the agent-oil weight ratio of 3:7. The viscosity reduction results are shown in Table 5.

[0113] Table 5

[0114] Aging temperature, °C Viscosity reduction rate, % 280 98.5 300 98.3 330 97.5 350 96.5 380 92.5

[0115] As shown in Table 5, after heating and aging product S10 at below 300℃ for 45 days, its viscosity-reducing performance remained essentially unchanged. After heating at 300-350℃ for 45 days, the viscosity reduction rate decreased by a maximum of 2%, but still remained above 96.5%. At 380℃, the viscosity reduction rate decreased by 6%, but still maintained 92.5%. Therefore, the viscosity reducer provided by this invention has good high-temperature resistance and is feasible for chemical viscosity reduction huff and puff and steam injection huff and puff in high-temperature reservoirs.

[0116] Application examples

[0117] A horizontal well in an oilfield, buried at a depth of 480m, has an underground crude oil viscosity of 4810 mPa·s, a core permeability of 1558 md, a porosity of 30.3%, and an effective oil layer thickness of 5.6m. It underwent 23 steam injection cycles, with each cycle injecting 1800 m³ of steam. 3The recovery rate was 21.9%, the water cut was 61.6%, and the average single-round steam throughput was 512 tons.

[0118] The product S10 obtained in Example 10 was prepared into a 3 wt% aqueous solution in 200 ml. 3 Combined with steam injection to 1800m 3 With a steam injection temperature of 350℃, the cycle output is 721 tons, which is 40.8% higher than the output of steam injection alone, showing a significant increase in production.

[0119] 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 compound, characterized in that, The compound has the structure shown in Formula I: In Formula I, R1 is selected from H, substituted or unsubstituted C1-C6 alkyl groups, and R2 and R3 are each independently selected from H, substituted or unsubstituted C1-C6 alkyl groups, substituted or unsubstituted C6-C6 alkyl groups. 12 Aromatic group, M is selected from alkali metal.

2. The compound according to claim 1, wherein, R1 is selected from H, substituted or unsubstituted C1-C3 alkyl groups, preferably selected from H, methyl or ethyl.

3. The compound according to claim 1 or 2, wherein, R2 is selected from H, substituted or unsubstituted C1-C3 alkyl groups, and substituted or unsubstituted C6-C4 alkyl groups. 10 The aromatic group is preferably selected from H, methyl, ethyl, propyl, phenyl, benzyl, p-tolyl, o-tolyl or m-tolyl, and more preferably from H, methyl, ethyl or phenyl.

4. The compound according to any one of claims 1-3, wherein, R3 is selected from H, substituted or unsubstituted C1-C3 alkyl groups, and substituted or unsubstituted C6-C4 alkyl groups. 10 The aromatic group is preferably selected from H, methyl, ethyl, propyl, phenyl, benzyl, p-tolyl, o-tolyl or m-tolyl.

5. The compound according to any one of claims 1-4, wherein, M is selected from Na or K.

6. A method for preparing a compound, characterized in that, The preparation method includes: reacting an aqueous solution containing compound A and a methanol solution containing compound B in the presence of a catalyst in a non-oxidizing atmosphere to obtain a reaction product containing the compound; Wherein, compound A and compound B have the structures shown in Formula II and Formula III, respectively; In Formula II, R'1 is selected from H, substituted or unsubstituted C1-C6 alkyl groups, and M' is selected from alkali metals; in Formula III, R'2 and R'3 are each independently selected from H, substituted or unsubstituted C1-C6 alkyl groups, substituted or unsubstituted C6-C6 alkyl groups. 12 Aromatic group.

7. The preparation method according to claim 6, wherein, R'1 is selected from H, substituted or unsubstituted C1-C3 alkyl groups, preferably from H, methyl or ethyl.

8. The preparation method according to claim 6 or 7, wherein, R'2 is selected from H, substituted or unsubstituted C1-C3 alkyl groups, substituted or unsubstituted C6-C2 groups. 10 The aromatic group is preferably selected from H, methyl, ethyl, propyl, phenyl, benzyl, p-tolyl, o-tolyl or m-tolyl, and more preferably from H, methyl, ethyl or phenyl.

9. The preparation method according to any one of claims 6-8, wherein, R'3 is selected from H, substituted or unsubstituted C1-C3 alkyl groups, substituted or unsubstituted C6-C3 alkyl groups. 10 The aromatic group is preferably selected from H, methyl, ethyl, propyl, phenyl, benzyl, p-tolyl, o-tolyl or m-tolyl.

10. The preparation method according to any one of claims 6-9, wherein, M' is selected from Na or K.

11. The method according to any one of claims 6-10, wherein, The amount of compound A is 20-30 parts by weight, and the amount of compound B is 2.2-24 parts.

12. The method according to any one of claims 6-11, wherein, In the aqueous solution containing compound A, the weight ratio of compound A to water is 20-30:80-100.

13. The method according to any one of claims 6-12, wherein, In the methanol solution containing compound B, the weight ratio of compound B to methanol is 2.2-24:10-50.

14. The method according to any one of claims 6-13, wherein, The catalyst is selected from at least one of bis(1,5-cyclooctadiene)nickel, nickel acetylacetonate, and ferric bromide.

15. The method according to any one of claims 6-14, wherein, The mass ratio of the catalyst to compound A is 1-5:20-30.

16. The method according to any one of claims 6-15, wherein, The reaction conditions include: a temperature of 60-90℃, preferably 65-75℃; and a time of 0.1-48h, preferably 1-36h.

17. The application of the compound according to any one of claims 1-5, or the compound prepared by the method according to any one of claims 6-16, in heavy oil extraction, unblocking and transportation, preferably in high-temperature reservoir chemical viscosity reduction huff and puff and steam injection for oil recovery.

18. A method for heavy oil extraction, characterized in that, The method includes: contacting and mixing an aqueous solution of the compound and heavy oil to obtain a mixture containing heavy oil; The viscosity reducer contained in the aqueous solution of the compound is selected from the compound described in any one of claims 1-5, or the compound prepared by the method described in any one of claims 6-16.

19. The method according to claim 18, wherein, The content of the compound in the aqueous solution is 0.1-3 wt%, preferably 1-3 wt%.

20. The method according to claim 18 or 19, wherein, The weight ratio of the aqueous solution of the compound to the heavy oil, calculated as a compound, is 0.4-2.

5. The viscosity of the heavy oil at 50°C is 100-5000 mPa·s.

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