Active nano viscosity reducer as well as preparation method and application thereof

Abstract

The invention discloses an active nano viscosity reducer as well as a preparation method and application thereof, the preparation method comprises the following steps: A1, preparing an amphiphilic nano material which comprises the following raw materials: hydrophilic silane and hydrophobic silane; a2, preparing an active nano viscosity reducer, wherein the raw materials comprise the amphiphilic nano material in the A1 and a viscosity reduction active group. The active nano viscosity reducer for reducing the viscosity of the thickened oil, provided by the invention, has the characteristic of ultra-small size, the particle size is 5-20 nm, the stability is good, and the zeta potential absolute value is greater than or equal to 20 mV. The viscosity reduction capacity can reach 85% or above, and the viscosity reducer is environment-friendly, can be self-dispersed and is easy to prepare, and the synthesis yield can reach 60% or above.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of viscosity reducer, in particular to an active nano viscosity reducer, a preparation method and application thereof. BACKGROUND

[0002] With the global demand for crude oil, conventional oil production has entered the twilight stage, and heavy oil production has become our focus. At present, the reserves of heavy oil are large and the content is high, and China is rich in heavy oil resources. However, compared with crude oil, heavy oil has the characteristics of high viscosity, high density and poor flowability.

[0003] The high content of colloid asphaltene is the main reason for the high viscosity of heavy oil. Asphaltene is formed under complex and variable geographical conditions, and it is a combination of high molecular weight hydrocarbons and some polar heteroatoms. Its molecular structure and relative molecular mass are uncertain. The colloid contains a large amount of ether, amine and phenolic compounds with aromatic carboxylic acid structure, so it has strong polarity. Because it contains complex chemical components with a large number of heteroatoms, and the aromaticity is smaller than that of asphaltene, so the colloid can be used as a gelling agent to prevent the aggregation of asphaltene self-association, and the colloid molecules themselves will also polymerize, thereby increasing the viscosity of heavy oil. Asphaltene is prone to sedimentation. Due to the presence of a large number of polar functional groups, it exhibits strong polarity. Under the action of hydrogen bonds, the polycyclic aromatic core of asphaltene molecules forms a complex aggregate structure through face-to-face and edge-to-face stacking, and the colloid molecules are stacked on the surface of the asphaltene particles, forming aggregated particles. These particles are also connected to each other under the action of hydrogen bonds, forming a complex aggregation structure, which makes the crude oil have high viscosity.

[0004] Common heavy oil viscosity reduction technologies include heavy oil thermal recovery, emulsification viscosity reduction, microbial viscosity reduction, heavy oil modification viscosity reduction and dilution viscosity reduction. At present, the process of heavy oil cold production viscosity reduction is simple, easy to operate and low in energy consumption, which is an urgently needed development technology. The chemical agent required for heavy oil cold production is the main research target. Active nano particles of nano materials can prevent asphaltene from forming a large viscoelastic network and reduce the viscosity of heavy oil. At present, nano viscosity reducer has not been widely used, which is the main target for current research.

[0005] Publication (announcement) No. CN116948619A discloses a heavy oil viscosity reducer and a viscosity reduction method. The chitosan solid, distilled water and acid dissolving agent are added into the mixing chamber in proportion, stirred and impurities are removed, and then the pH value is adjusted to obtain a chitosan aqueous solution. Then, the pH alkalinity regulator is added dropwise into the chitosan aqueous solution, and the pH is adjusted to 6.5-6.7. The formed chitosan flocculent precipitate can be adsorbed on the oil-water interface to form an emulsion with water as the external phase, thereby reducing the viscosity and improving the heavy oil production efficiency.

[0006] The patent (publication) No. CN116425903A discloses a preparation method of a chitosan derivative type oil-soluble viscosity reducer for thick oil, and the provided chitosan derivative type oil-soluble viscosity reducer uses natural polysaccharide material chitosan as raw material, and prepares a thick oil viscosity reducer through chemical modification and ion exchange; the provided chitosan derivative type oil-soluble viscosity reducer uses hydrophobic modification to prepare a lipophilic polymer, can reduce the amount of toxic solvent in the preparation process of the lipophilic polymer, and has the advantages of convenient product purification and high yield; the viscosity reducer can reduce the viscosity of thick oil by more than 50% at 50 DEG C.

[0007] The patent (publication) No. CN106190084B discloses a nano-composite thick oil viscosity reducer and a preparation method thereof, and the surface and pores of the synthesized MSN are modified by grafting polymerization to prepare a nano-composite material with excellent hydrophobicity, and the MSN composite material is first applied to the viscosity reduction field of high-wax thick oil. The prepared MSN composite material viscosity reducer has good viscosity reduction effect, and the viscosity reduction rate of the MSN composite material viscosity reducer for Daqing Linyuan high-wax thick oil at 40 DEG C is 70.30%, and the viscosity reduction rate of the MSN composite material viscosity reducer for Daqing Dandong station high-wax thick oil at 40 DEG C is 79.37%.

[0008] The viscosity reduction rate of the present application for thick oil at 50 DEG C is more than 85%, which is better than the above-mentioned invention.

[0009] In summary, the technical solutions, the technical problems to be solved and the beneficial effects of the above disclosed technologies are different from those of the present application. The above disclosed technology documents do not have technical inspiration for more technical features, technical problems to be solved and beneficial effects of the present application. SUMMARY

[0010] In view of the above-mentioned defects in the prior art, the purpose of the present application is to provide an active nano viscosity reducer, a preparation method and application thereof. From the perspective of chemical agent synthesis, an active nano viscosity reducer is obtained by preparing and modifying a nano viscosity reducer material, so as to reduce the viscosity of thick oil and improve the production rate of thick oil reservoir.

[0011] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0012] On the one hand, the present application provides an active nano viscosity reducer, and the main molecular structure formula is as follows:

[0013]

[0014] In the formula, m is a positive integer of 3-9, and n is a positive integer of 3-9.

[0015] Preferably, m is 6, and n is 4.

[0016] Preferably, the active nano viscosity reducer has a particle size of 5-20 nm.

[0017] In a second aspect, the application provides a method for preparing the active nano viscosity reducer.

[0018] A1, preparing amphiphilic nanomaterials, raw materials including hydrophilic silane and hydrophobic silane;

[0019] A2, preparing active nano viscosity reducer, raw materials including the amphiphilic nanomaterials in A1 and viscosity-reducing active groups.

[0020] Further, in A1, the method specifically includes the following steps:

[0021] S1, preparing hydrophobic nanomaterials, i.e. hydrophobic silane, raw materials including dodecyl triethoxysilane and trisodium citrate;

[0022] S2, preparing amphiphilic nanomaterials, raw materials including triaminopropyl triethoxysilane, i.e. hydrophilic silane, and the hydrophobic nanomaterials in S1;

[0023] Further, in A2, the method specifically includes the following steps:

[0024] S3, preparing viscosity-reducing active group particles, raw materials including acrylamide and styrene;

[0025] S4, preparing active nano viscosity reducer, raw materials including the viscosity-reducing active group particles in S3 and the amphiphilic nanomaterials in S2.

[0026] Further, in S1, the weight ratio of dodecyl triethoxysilane to trisodium citrate is 1:1-2:3;

[0027] Further, in S2, the weight ratio of triaminopropyl triethoxysilane to the hydrophobic nanomaterials obtained in S1 is 1:2-2:1;

[0028] Further, in S3, the weight ratio of acrylamide to styrene is 1:3-3:1;

[0029] Further, in S4, the weight ratio of the viscosity-reducing active groups obtained in S3 to the amphiphilic nanomaterials obtained in S2 is 1:2-2:1;

[0030] Preferably, in S1, the weight ratio of dodecyl triethoxysilane to trisodium citrate is 2:3;

[0031] Preferably, in S2, the weight ratio of triaminopropyl triethoxysilane to the hydrophobic nanomaterials obtained in S1 is 1:1;

[0032] Preferably, in S3, the weight ratio of acrylamide and styrene is 3:2.

[0033] Preferably, in S4, the weight ratio of the viscosity-reducing active group obtained in S3 and the amphiphilic nanomaterial obtained in S2 is 1:1.

[0034] Further, in S1, dodecyl triethoxysilane and trisodium citrate are mixed into the first solvent, stirred, and then protected by a protective gas. After high-temperature hydrothermal reaction, the mixture is cooled and taken out for standby;

[0035] Further, in S2, triaminopropyl triethoxysilane is added to the second solvent and stirred at room temperature. Then, the hydrophobic nanomaterial obtained in S1 is added and stirred. After drying, the amphiphilic nanomaterial is obtained.

[0036] Further, in S3, acrylamide and styrene are mixed and then added to the third solvent. The mixture is heated in a water bath and stirred. After drying, the viscosity-reducing active group particles are obtained.

[0037] Further, in S4, the viscosity-reducing active group obtained in S3 and the amphiphilic nanomaterial obtained in S2 are added to the fourth solvent. A catalyst is added and heated for reaction. After drying, the active nanometer viscosity reducer is obtained.

[0038] Preferably, the first solvent is ultrapure water, and the weight ratio of the sum of dodecyl triethoxysilane and trisodium citrate to the first solvent is 1:3-1:5.

[0039] Preferably, the second solvent is ultrapure water, and the weight ratio of triaminopropyl triethoxysilane to the second solvent is 1:3-1:5.

[0040] Preferably, the third solvent is an ethanol solution, and the weight ratio of the sum of acrylamide and styrene to the third solvent is 1:4-1:6.

[0041] Preferably, the fourth solvent is an ethanol solution, and the weight ratio of the sum of the viscosity-reducing active group and the amphiphilic nanomaterial to the fourth solvent is 1:4-1:6.

[0042] Preferably, the catalyst is sodium hydroxide, and the weight ratio of the sum of the viscosity-reducing active group obtained in S3 and the amphiphilic nanomaterial obtained in S2 to sodium hydroxide is 1:0.001-1:0.01.

[0043] Most preferably, the weight ratio of the sum of dodecyl triethoxysilane and trisodium citrate to the first solvent is 1:3.

[0044] Most preferably, the weight ratio of triaminopropyl triethoxysilane to the second solvent is 1:4.

[0045] Most preferably, the ratio of the sum of the weight of acrylamide and styrene to the weight of the third solvent is 1:5;

[0046] Most preferably, the ratio of the sum of the weight of the viscosity-reducing active group and the amphiphilic nanomaterial to the weight of the fourth solvent is 1:5;

[0047] Most preferably, the ratio of the sum of the viscosity-reducing active group obtained in S3 to the amphiphilic nanomaterial obtained in S2 to the weight of sodium hydroxide is 1:0.001.

[0048] Preferably, in S1, the stirring speed is 500-1000 rpm, the stirring time is 10±2 min; the protective gas is nitrogen, the gas inlet time is 25±3 min; the high-temperature hydrothermal is oven preheating, the temperature is 150-250℃, the high-temperature hydrothermal reaction time is 1-4 h; the cooling uses cold water rapid cooling, the cooling time is 30±4 min;

[0049] Preferably, in S2, the normal temperature stirring speed is 500-1000 rpm, the normal temperature stirring time is 1-3 h; the continuous stirring time is 1-3 h; the drying is freeze-drying, the time is 36±3 h;

[0050] Preferably, in S3, the heating temperature in the water bath is 60-90℃; the stirring speed is 500-1000 rpm, the stirring time is 0.5-3 h; the drying is vacuum drying, the drying time is 24±2 h;

[0051] Preferably, in S4, a water bath is used for heating, the water bath temperature is 60-90℃, the heating reaction time is 6-10 h; the drying is vacuum drying, the drying time is 36±3 h.

[0052] Most preferably, in S1, the stirring speed is 750 rpm, the stirring time is 10 min; the protective gas is nitrogen, the gas inlet time is 25 min; the high-temperature hydrothermal is oven preheating, the temperature is 200℃, the high-temperature hydrothermal reaction time is 2 h; the cooling uses cold water rapid cooling, the cooling time is 30 min;

[0053] Most preferably, in S2, the normal temperature stirring speed is 800 rpm, the normal temperature stirring time is 2 h; the continuous stirring time is 2 h; the drying is freeze-drying, the time is 36 h;

[0054] Most preferably, in S3, the heating temperature in the water bath is 60℃; the stirring speed is 700 rpm, the stirring time is 2 h; the drying is vacuum drying, the drying time is 24 h;

[0055] Most preferably, in S4, a water bath is used for heating, the water bath temperature is 60℃, the heating reaction time is 6 h; the drying is vacuum drying, the drying time is 36 h.

[0056] In one aspect, the application provides an application of the active nanometer viscosity reducer.

[0057] Compared with the prior art, the application has the following beneficial effects:

[0058] 1. The active nanometer viscosity reducer for reducing the viscosity of heavy oil has the characteristics of ultra-small size, a particle size of 5-20 nm, good stability and a zeta potential absolute value of greater than or equal to 20 mV.

[0059] 2. The active nanometer viscosity reducer for reducing the viscosity of heavy oil has a viscosity reduction capacity of more than 85%, and is environment-friendly, self-dispersible and easy to prepare.

[0060] 3. The active nanometer viscosity reducer for reducing the viscosity of heavy oil has a synthesis yield of more than 60%. BRIEF DESCRIPTION OF DRAWINGS

[0061] Figure 1 is a transmission electron microscope image of the active nanometer viscosity reducer;

[0062] Figure 2 is an infrared spectrum of the active nanometer viscosity reducer;

[0063] Figure 3 is an XPS photoelectron spectrum of the active nanometer viscosity reducer. DETAILED DESCRIPTION

[0064] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the application.

[0065] Unless otherwise specified, the reagents in the embodiments of the application can be purchased through commercial channels.

[0066] The application provides a preparation method of the active nanometer viscosity reducer, comprising the following steps:

[0067] S1, preparation of a hydrophobic nanometer material;

[0068] The dodecyl triethoxysilane and trisodium citrate are mixed and added into ultrapure water according to a weight ratio of 1:1-2:3, and the weight ratio of the sum of the dodecyl triethoxysilane and trisodium citrate to the ultrapure water is 1:3-1:5.

[0069] Stir at 500-1000 rpm for 10±2 min, then pass nitrogen gas for 25±3 min, then put into the oven preheated at 150-200℃, high-temperature hydrothermal reaction for 1-4 h, then take out and cool down quickly in cold water for 30±4 min, and then take out for standby.

[0070] S2, preparation of amphiphilic nanomaterials;

[0071] Put triaminopropyl triethoxysilane and ultrapure water in a beaker at a weight ratio of 1:3-1:5, stir at 500-1000 rpm at room temperature for 1-3 h, then add the hydrophobic nanomaterial obtained in S1, and the weight ratio of triaminopropyl triethoxysilane to the hydrophobic nanomaterial obtained in S1 is 1:2-2:1;

[0072] Continue stirring for 1-3 h, then freeze-dry for 36±3 h to obtain amphiphilic nanomaterials;

[0073] S3, synthesis of viscosity-reducing active groups;

[0074] Add acrylamide and styrene to an ethanol solution at a weight ratio of 1:3-3:1, and the weight ratio of the sum of acrylamide and styrene to the ethanol solution is 1:4-1:6;

[0075] Put into a water bath and heat at a temperature of 60-90℃, stir at a speed of 500-1000 rpm for 0.5-3 h, and vacuum dry for 24±2 h to obtain viscosity-reducing active group particles;

[0076] S4, synthesis of active nanometer viscosity reducer;

[0077] Add the viscosity-reducing active groups obtained in S3 and the amphiphilic nanomaterials obtained in S2 to an ethanol solvent at a weight ratio of 1:2-2:1, and the weight ratio of the sum of the viscosity-reducing active groups and the amphiphilic nanomaterials to the ethanol solvent is 1:4-1:6;

[0078] Transfer to a water bath at 60-90℃ and add sodium hydroxide as a catalyst, and the weight ratio of the sum of the viscosity-reducing active groups obtained in S3 and the amphiphilic nanomaterials obtained in S2 to sodium hydroxide is 1:0.001-1:0.01;

[0079] After heating for 6-10 h, vacuum dry for 36±3 h to obtain an active nanometer viscosity reducer.

[0080] The main molecular structure of the active nanometer viscosity reducer prepared by this method is as follows:

[0081]

[0082] Wherein n is a positive integer of 3-9, and m is a positive integer of 3-9.

[0083] The active nano viscosity reducer has a particle size of 5-20 nm.

[0084] Example 1

[0085] The embodiment provides a preparation method of the active nano viscosity reducer, and comprises the following steps:

[0086] S1, preparation of a hydrophobic nano material;

[0087] In a beaker, 30 g of ultrapure water is added, 4 g of dodecyl triethoxysilane and 6 g of trisodium citrate are added into the beaker, and stirring is carried out at a rotating speed of 750 rpm for 10 min, then nitrogen gas is introduced for 25 min, and then the beaker is placed into a preheated oven at 200 DEG C, and high-temperature hydrothermal reaction is carried out for 2 h, then the beaker is taken out, and rapid cooling is carried out with cold water for 30 min, and then the beaker is taken out;

[0088] S2, preparation of an amphiphilic nano material;

[0089] In a beaker, 5 g of triaminopropyl triethoxysilane and 20 g of ultrapure water are placed, stirring is carried out at a rotating speed of 800 rpm at room temperature for 2 h, then 5 g of the hydrophobic nano material obtained in S1 is added, and stirring is continued for 2 h, and then the amphiphilic nano material is obtained by freeze-drying for 36 h;

[0090] S3, synthesis of a viscosity-reducing active group;

[0091] In a beaker, 6 g of acrylamide and 4 g of styrene are mixed, and then the mixture is placed into a water bath, heating is carried out at a temperature of 60 DEG C, and stirring is carried out at a rotating speed of 700 rpm for 2 h, and then the viscosity-reducing active group particles are obtained by vacuum drying for 24 h;

[0092] S4, synthesis of an active nano viscosity reducer;

[0093] In a beaker, 5 g of the viscosity-reducing active group obtained in S3 and 5 g of the amphiphilic nano material obtained in S2 are added into 50 g of an ethanol solvent, and then the beaker is placed into a water bath at 60 DEG C, 0.01 g of sodium hydroxide is added as a catalyst, and then heating reaction is carried out for 6 h, and then the active nano viscosity reducer is obtained by vacuum drying for 36 h.

[0094] Example 2

[0095] On the basis of example 1, the embodiment modifies step S1:

[0096] S1, preparation of a hydrophobic nano material;

[0097] In a beaker, 40 g of ultrapure water was added, 4 g of dodecyl triethoxysilane and 6 g of trisodium citrate were added into the beaker, stirred at a speed of 1000 rpm for 8 min, then nitrogen gas was introduced for 28 min, then put into a preheated oven at 150°C, high temperature hydrothermal reaction for 4 h, then take out and quickly cool with cold water for 26 min, then take out.

[0098] Example 3:

[0099] Based on example 1, this example modifies step S1:

[0100] S1, preparation of hydrophobic nanomaterials;

[0101] In a beaker, 50 g of ultrapure water was added, 4 g of dodecyl triethoxysilane and 6 g of trisodium citrate were added into the beaker, stirred at a speed of 500 rpm for 8 min, then nitrogen gas was introduced for 22 min, then put into a preheated oven at 175°C, high temperature hydrothermal reaction for 3 h, then take out and quickly cool with cold water for 30 min, then take out.

[0102] Example 4:

[0103] Based on example 1, this example modifies steps S1 and S2:

[0104] S1, preparation of hydrophobic nanomaterials;

[0105] In a beaker, 30 g of ultrapure water was added, 5 g of dodecyl triethoxysilane and 5 g of trisodium citrate were added into the beaker, stirred at a speed of 750 rpm for 12 min, then nitrogen gas was introduced for 25 min, then put into a preheated oven at 200°C, high temperature hydrothermal reaction for 1 h, then take out and quickly cool with cold water for 33 min, then take out.

[0106] S2, preparation of amphiphilic nanomaterials;

[0107] 8 g of triaminopropyl triethoxysilane and 24 g of ultrapure water were placed in a beaker and stirred at a speed of 1000 rpm at room temperature for 1 h, then 4 g of hydrophobic nanomaterials obtained in S1 were added and stirred for another 1 h, then freeze-dried for 39 h to obtain amphiphilic nanomaterials.

[0108] Example 5:

[0109] Based on example 1, this example modifies step S2:

[0110] S2, preparation of amphiphilic nanomaterials;

[0111] Put 4g triaminopropyl triethoxysilane and 20g ultrapure water into a beaker, stir at a speed of 500 rpm at room temperature for 3h, then add 8g hydrophobic nanomaterial obtained in S1, continue to stir for 3h, then freeze-dry for 33h to obtain amphiphilic nanomaterial.

[0112] Example 6:

[0113] On the basis of Example 1, this embodiment modifies step S3:

[0114] S3, synthesis of viscosity-reducing active groups;

[0115] Mix 6g acrylamide, 4g styrene, and 40g ethanol solution in a beaker, then heat in a water bath, the heating temperature is 80℃, stir at a speed of 1000 rpm for 0.5h, vacuum dry for 22h to obtain viscosity-reducing active group particles.

[0116] Example 7:

[0117] On the basis of Example 1, this embodiment modifies step S3:

[0118] S3, synthesis of viscosity-reducing active groups;

[0119] Mix 6g acrylamide, 4g styrene, and 60g ethanol solution in a beaker, then heat in a water bath, the heating temperature is 90℃, stir at a speed of 500 rpm for 3h, vacuum dry for 26h to obtain viscosity-reducing active group particles.

[0120] Example 8:

[0121] On the basis of Example 1, this embodiment modifies step S4:

[0122] S4, synthesis of active nanometer viscosity reducer;

[0123] Add 6g viscosity-reducing active groups obtained in S3 and 3g amphiphilic nanomaterial obtained in S2 to 36g ethanol solvent, then transfer to a 90℃ water bath, add 0.03g sodium hydroxide as catalyst, heat for 8h, vacuum dry for 33h to obtain active nanometer viscosity reducer.

[0124] Example 9:

[0125] On the basis of Example 1, this embodiment modifies step S4:

[0126] S4, synthesis of active nanometer viscosity reducer;

[0127] The 4g of the viscosity-reducing active group obtained in S3 and 8g of the amphiphilic nanomaterial obtained in S2 were added to 60g of ethanol solvent, and then transferred to a water bath at 80°C. After adding 0.12g of sodium hydroxide as a catalyst, the reaction was heated for 10h. After vacuum drying for 39h, the active nano viscosity reducer was obtained.

[0128] Example 10:

[0129] Based on Example 1, this example modifies step S3:

[0130] S3, synthesis of viscosity-reducing active group;

[0131] After mixing 5g of acrylamide, 5g of styrene, and 60g of ethanol solution in a beaker, it was placed in a water bath for heating. The heating temperature was 90°C, and the stirring speed was 500rpm. After stirring for 3h, the viscosity-reducing active group particles were obtained after vacuum drying for 26h.

[0132] Example 11:

[0133] Based on Example 1, this example modifies step S3:

[0134] S3, synthesis of viscosity-reducing active group;

[0135] After mixing 3g of acrylamide, 9g of styrene, and 60g of ethanol solution in a beaker, it was placed in a water bath for heating. The heating temperature was 70°C, and the stirring speed was 750rpm. After stirring for 3h, the viscosity-reducing active group particles were obtained after vacuum drying for 26h.

[0136] Example 12:

[0137] Based on Example 1, this example modifies step S3:

[0138] S3, synthesis of viscosity-reducing active group;

[0139] After mixing 9g of acrylamide, 3g of styrene, and 60g of ethanol solution in a beaker, it was placed in a water bath for heating. The heating temperature was 70°C, and the stirring speed was 750rpm. After stirring for 3h, the viscosity-reducing active group particles were obtained after vacuum drying for 26h.

[0140] Comparative Example 1:

[0141] Based on Example 1, this example modifies step S1:

[0142] S1, preparation of hydrophobic nanomaterial;

[0143] In a beaker, 50 g of ultrapure water was added, 4 g of dodecyl triethoxysilane and 6 g of trisodium citrate were added into the beaker, stirred at a speed of 500 rpm for 8 min, then nitrogen gas was introduced for 30 min, then put into a preheated oven at 250℃, high temperature hydrothermal reaction for 4 h, then take out and quickly cool with cold water for 30 min.

[0144] Comparative Example 2:

[0145] Based on Example 1, this example modifies steps S1 and S2:

[0146] S1, preparation of hydrophobic nanomaterials;

[0147] In a beaker, 30 g of ultrapure water was added, 5 g of dodecyl triethoxysilane and 5 g of trisodium citrate were added into the beaker, stirred at a speed of 750 rpm for 10 min, then nitrogen gas was introduced for 30 min, then put into a preheated oven at 250℃, high temperature hydrothermal reaction for 4 h, then take out and quickly cool with cold water for 33 min.

[0148] S2, preparation of amphiphilic nanomaterials;

[0149] 8 g of triaminopropyl triethoxysilane and 24 g of ultrapure water were placed in a beaker and stirred at a speed of 1000 rpm at room temperature for 1 h, then 4 g of hydrophobic nanomaterials obtained in S1 were added and stirred for another 1 h, then freeze-dried for 39 h to obtain amphiphilic nanomaterials.

[0150] Comparative Example 3:

[0151] Based on Example 1, this example modifies step S3:

[0152] S3, synthesis of viscosity-reducing active groups;

[0153] A mixture of 10 g of acrylamide, 5 g of styrene, and 60 g of ethanol solution was placed in a beaker and heated in a water bath at a temperature of 70℃, stirred at a speed of 750 rpm for 3 h, and vacuum dried for 26 h to obtain viscosity-reducing active group particles.

[0154] Test Example 1:

[0155] The particle size and zeta potential of the above 11 active nanoviscosity reducers were tested, and the experimental results are shown in Table 1.

[0156] Table 1

[0157]

[0158]

[0159] Experimental results show that the particle size of the active nano-thickness reducer prepared by the method is between 5nm and 20nm.

[0160] Test Example 2:

[0161] The viscosity of the above 11 active nano viscosity reducers was tested, and the results are shown in Table 2. The viscosity reduction rate f1 was calculated according to the following formula:

[0162]

[0163] In the formula, f1 is the viscosity reduction rate, %;

[0164] In the formula μ A The initial viscosity of the heavy oil at 50℃ is given in mPa·s.

[0165] In the formula, μ1 is the viscosity at 50℃ with the viscosity reducer added, in mPa·s.

[0166] Table 2

[0167]

[0168]

[0169] The results show that the active nano viscosity reducer prepared by the method can significantly reduce the viscosity of heavy oil. It can be seen that the viscosity reduction rate is above 90% when m=6 and n=4, and m=6 and n=4 are the optimal values. Among them, Example 1 is the optimal example, and Examples 10, 11 and 12 are examples with a viscosity reduction rate of more than 85%.

[0170] The viscosity reduction rates of the comparative samples synthesized without following the preparation method were all below 80%.

[0171] The active nano-thickness reducer synthesized in Example 1 was characterized by XPS, TEM, and infrared spectroscopy. The surface group composition and morphological particle size distribution of the active nano-thickness reducer were analyzed. Figure 1 , 2 As shown in Figure 3.

[0172] The reagents used in this application are all well-known technologies in this field. They can be purchased and applied directly, and will not be described further.

[0173] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0174] The above descriptions are only the preferred embodiments of the present application, not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall fall within the scope of the present application.

Claims

1. An active nano-viscosity reducer, characterized in that, Its main molecular structure is as follows: In the formula, m is a positive integer from 3 to 9, and n is a positive integer from 3 to 9.

2. The active nano-viscosity reducer according to claim 1, characterized in that, m is 6 and n is 4.

3. The active nano-viscosity reducer according to claim 1, characterized in that, The active nano viscosity reducer has a particle size of 5nm-20nm.

4. A method for preparing an active nano-viscosity reducer, characterized in that, The preparation of the active nano-thickness reducer according to claim 1 comprises the following steps: A1. Preparation of amphiphilic nanomaterials, using raw materials including hydrophilic silanes and hydrophobic silanes; A2. Preparation of active nano-viscosity reducers, the raw materials include the amphiphilic nanomaterials and viscosity-reducing active groups in A1.

5. The method for preparing an active nano-viscosity reducer according to claim 4, characterized in that, In A1, the specific steps include: S1. Preparation of hydrophobic nanomaterials, namely hydrophobic silanes, with raw materials including dodecyltriethoxysilane and trisodium citrate; S2. Preparation of amphiphilic nanomaterials, the raw materials include triaminopropyltriethoxysilane, i.e. hydrophilic silane, and the hydrophobic nanomaterials in S1; In A2, the specific steps include: S3. Prepare viscosity-reducing active group particles, the raw materials of which include acrylamide and styrene; S4. Prepare active nano-viscosity reducers, using raw materials including the viscosity-reducing active group particles in S3 and the amphiphilic nanomaterials in S2.

6. The method for preparing an active nano-viscosity reducer according to claim 5, characterized in that, In S1, the weight ratio of dodecyltriethoxysilane and trisodium citrate is 1:1-2:3; In S2, the weight ratio of triaminopropyltriethoxysilane to the hydrophobic nanomaterials obtained in S1 is 1:2-2:1; In S3, the weight ratio of acrylamide to styrene is 1:3-3:1; In S4, the weight ratio of the viscosity-reducing active group obtained in S3 to the amphiphilic nanomaterial obtained in S2 is 1:2-2:

1.

7. The method for preparing an active nano-viscosity reducer according to claim 6, characterized in that, In S1, the weight ratio of dodecyltriethoxysilane to trisodium citrate is 2:3; In S2, the weight ratio of triaminopropyltriethoxysilane to the hydrophobic nanomaterials obtained in S1 is 1:1; In S3, the weight ratio of acrylamide to styrene is 3:2; In S4, the weight ratio of the viscosity-reducing active group obtained in S3 to the amphiphilic nanomaterial obtained in S2 is 1:

1.

8. The method for preparing an active nano-viscosity reducer according to claim 5, characterized in that, In S1, dodecyltriethoxysilane and trisodium citrate are mixed and added to the first solvent, stirred, and a protective gas is introduced. After high-temperature hydrothermal reaction, the mixture is cooled and taken out for later use. In S2, triaminopropyltriethoxysilane was added to the second solvent and stirred at room temperature. Then, the hydrophobic nanomaterials obtained in S1 were added, and stirring was continued. The mixture was then dried to obtain the amphiphilic nanomaterials. In S3, acrylamide and styrene are mixed and added to the third solvent, then heated in a water bath, stirred, and dried to obtain particles with viscosity-reducing active groups. In S4, the viscosity-reducing active groups obtained in S3 and the amphiphilic nanomaterials obtained in S2 are added to the fourth solvent, a catalyst is added, the reaction is heated, and then dried to obtain the active nano viscosity reducer.

9. The method for preparing an active nano-viscosity reducer according to claim 8, characterized in that, The first solvent is ultrapure water, and the weight ratio of the sum of dodecyltriethoxysilane and trisodium citrate to the weight of the first solvent is 1:3-1:

5. The second solvent is ultrapure water, and the weight ratio of triaminopropyltriethoxysilane to the second solvent is 1:3-1:

5. The third solvent is an ethanol solution, and the weight ratio of the sum of the acrylamide and styrene to the weight of the third solvent is 1:4 to 1:

6. The fourth solvent is an ethanol solution, and the weight ratio of the sum of the viscosity-reducing active groups and the amphiphilic nanomaterials to the weight of the fourth solvent is 1:4-1:

6. The catalyst is sodium hydroxide. The weight ratio of the viscosity-reducing active group obtained in S3 and the amphiphilic nanomaterial obtained in S2 to sodium hydroxide is 1:0.001-1:0.

01.

10. The method for preparing an active nano-viscosity reducer according to claim 9, characterized in that, The weight ratio of the sum of dodecyltriethoxysilane and trisodium citrate to the weight of the first solvent is 1:3; The weight ratio of triaminopropyltriethoxysilane to the second solvent is 1:4; The weight ratio of the sum of acrylamide and styrene to the weight of the third solvent is 1:5; The weight ratio of the sum of the viscosity-reducing active groups and the amphiphilic nanomaterials to the weight of the fourth solvent is 1:5; The catalyst is sodium hydroxide. The weight ratio of the viscosity-reducing active group obtained in S3 and the amphiphilic nanomaterial obtained in S2 to sodium hydroxide is 1:0.

001.

11. The method for preparing an active nano-viscosity reducer according to claim 8, characterized in that, In S1, the stirring speed is 500 rpm-1000 rpm, and the stirring time is 10 ± 2 min; the protective gas is nitrogen, and the gas introduction time is 25 ± 3 min; the high-temperature hydrothermal treatment is done by preheating the oven at a temperature of 150℃-250℃, and the high-temperature hydrothermal reaction time is 1 h-4 h; the cooling is done by rapidly cooling with cold water, and the cooling time is 30 ± 4 min. In S2, the stirring speed at room temperature is 500 rpm-1000 rpm, and the stirring time at room temperature is 1 h-3 h; the stirring time is continued for 1 h-3 h; the drying is freeze drying, and the time is 36 ± 3 h; In S3, the heating temperature in the water bath is 60-90℃; the stirring speed is 500rpm-1000rpm, and the stirring time is 0.5-3h; the drying is vacuum drying, and the drying time is 24±2h. In S4, a water bath is used for heating at a temperature of 60℃-90℃ for a reaction time of 6h-10h; drying is performed under vacuum for 36±3h.

12. The method for preparing an active nano-viscosity reducer according to claim 11, characterized in that, In S1, the stirring speed is 750 rpm and the stirring time is 10 min; the protective gas is nitrogen and the gas introduction time is 25 min; the high-temperature hydrothermal treatment is done by preheating the oven at 200℃ and the high-temperature hydrothermal reaction time is 2 h; the cooling is done by rapid cooling with cold water for 30 min. In S2, the stirring speed at room temperature is 800 rpm, and the stirring time at room temperature is 2 hours; the stirring time is continued for 2 hours; the drying is freeze drying for 36 hours. In S3, the heating temperature in the water bath is 60℃; the stirring speed is 700 rpm; the stirring time is 2 hours; and the drying is vacuum drying for 24 hours. In S4, a water bath was used for heating at 60°C for 6 hours; drying was performed under vacuum for 36 hours.

13. An application of an active nano-viscosity reducer, characterized in that, An active nano viscosity reducer according to any one of claims 1-3 or an active nano viscosity reducer prepared by any one of claims 2-12 is used to reduce viscosity in heavy oil wells.

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