Pour-point-depressing paraffin inhibitor and preparation method thereof

Abstract

The invention relates to a pour point depressing paraffin inhibitor and a preparation method thereof. The pour point depressing paraffin inhibitor is prepared from the following raw material components: graphene oxide, acrylic acid, a dispersing agent, a catalyst and a solvent, wherein the content of the graphene oxide is 4%-14.5% by mass, the content of the acrylic acid is 38%-76% by mass, the content of the dispersing agent is 4%-6% by mass, and the content of the catalyst is 1%-2% by mass. The graphene oxide is introduced into the pour-point depressing paraffin inhibitor provided by the invention, the size nanocrystallization is easy to prevent the formation of wax crystals in crude oil, the pour-point depressing effect is good, and the crude oil is conveniently exploited from a shaft and transported by a crude oil pipeline.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of crude oil pour point depressant and wax prevention, and particularly relates to a pour point depressant and wax prevention agent and a preparation method thereof. BACKGROUND

[0002] Gum and asphaltene are mainly contained in heavy oil, so that the pour point of the heavy oil is relatively high. The heavy oil in Liaohe oilfield is mainly heavy oil, which is different from the light oil. The influencing factor of the pour point is not only related to the wax content, but more importantly, is affected by the gum and asphaltene. At present, the conventional pour point depressant and wax prevention agent is mainly used for studying the pour point depression and wax prevention of the light oil. The light oil in Liaohe oilfield is mainly produced in Xinglongtai oil production plant and Shenyang oil production plant. No matter the light oil or the heavy oil, the high pour point will cause poor flowability of the oil, especially below the pour point, the oil will lose the flowability, thereby causing great negative effects on the oil exploitation and pipeline oil transportation.

[0003] At present, the pour point depressant and wax prevention agent has good effects on the pour point depression and wax prevention of the light oil. However, for the problem of the high pour point of the oil caused by the gum and asphaltene, the conventional pour point depressant and wax prevention agent has poor effects on the pour point depression and wax prevention of the heavy oil, and the oil and water are quickly separated with the decrease of the pour point depression range. SUMMARY

[0004] The present application provides a pour point depressant and wax prevention agent and a preparation method thereof, so as to solve the following technical problem: how to reduce the pour point of the heavy oil.

[0005] In a first aspect, the present application provides a pour point depressant and wax prevention agent, and the raw material components of the pour point depressant and wax prevention agent include:

[0006] Oxidized graphene, acrylic acid and an additive; wherein the content of the oxidized graphene is 4% to 14.5%, and the content of the acrylic acid is 38% to 76% by mass fraction.

[0007] The content of the oxidized graphene is 4% to 14.5%, and the content of the acrylic acid is 38% to 76%.

[0008] Optionally, the content of the oxidized graphene is 6% to 10%, and the content of the acrylic acid is 60% to 65%.

[0009] Optionally, the additive further includes a dispersant, a catalyst and a solvent.

[0010] Optionally, the dispersant includes one of the following: sodium dodecyl benzene sulfonate and sodium dodecyl sulfate.

[0011] Optionally, the catalyst includes one of the following: sulfuric acid, hydrochloric acid and nitric acid.

[0012] Optionally, the solvent includes one of the following: ethylene glycol, water and ethanol.

[0013] Optionally, the content of the dispersant is 4% to 6%, and the content of the catalyst is 1% to 2%.

[0014] Optionally, the content of the dispersant is 4% to 5%, and the content of the catalyst is 1.5% to 2%.

[0015] In a second aspect, the application provides a preparation method of the pour point depressant and wax inhibitor, and the method comprises the following steps:

[0016] The graphene oxide, the dispersant and the solvent are mixed and stirred, and then ultrasonic treatment is performed to obtain the graphene oxide nanofluid.

[0017] The graphene oxide nanofluid, the acrylic acid and the catalyst are subjected to chemical reaction to obtain the pour point depressant and wax inhibitor.

[0018] Optionally, the process parameters of the chemical reaction include: temperature 70℃ to 80℃, and time 3h to 4h.

[0019] Compared with the prior art, the above technical solution provided by the embodiments of the application has the following advantages:

[0020] The graphene oxide has the characteristics of nanometer size and high oxygen-containing functional groups, can have a good pour point depression effect on the heavy oil, can destroy the continuous state of the heavy oil, can emulsify the crude oil to form an O / W emulsion to some extent, and thus has a good pour point depression and wax inhibition effect on the heavy oil containing gum and asphaltene with a high pour point; the graphene oxide and the acrylic acid are subjected to esterification under the action of the additive, the oxygen atom in the hydroxyl group of the graphene oxide is converted into a carbon-oxygen free radical in the esterification reaction, the carbon-oxygen free radical is subjected to an addition reaction with the double bond in the acrylic acid, the length of the carbon chain is increased, and meanwhile the hydroxyl group in the graphene oxide is subjected to an esterification reaction with the carboxyl group in the acrylic acid, so that the graphene oxide-based acrylic ester high molecular polymer is generated, the graphene oxide-based acrylic ester high molecular polymer can co-crystallize or adsorb the wax crystals in the heavy oil, the paraffin crystalline morphology in the heavy oil is changed, the crystal is small and the structural strength is reduced, the wax crystals are not easy to form a network structure with each other, the aggregation and growth of the wax crystals on the oil pipe wall and the sucker rod are effectively prevented, and thus the low-temperature fluidity of the heavy oil is improved, the yield value of the heavy oil is reduced, and the pour point of the heavy oil is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which are incorporated herein and constitute part of this specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0023] Figure 1 A structural schematic diagram of graphene oxide according to some embodiments of the present application is shown in FIG. 1.

[0024] Figure 2 A flowchart of a preparation method of a pour point depressant according to some embodiments of the present application is shown in FIG. 2. DETAILED DESCRIPTION

[0025] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort fall within the scope of protection of the present application.

[0026] Various embodiments of the present application can exist in the form of a range; it should be understood that the description in the form of a range is merely for the convenience and brevity, and should not be understood as a hard limitation on the scope of the present application; therefore, it should be considered that the described range has specifically disclosed all possible sub-ranges and single values within the range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the described range, such as 1, 2, 3, 4, 5 and 6, regardless of the range. In addition, whenever a numerical range is indicated in the present application, it refers to any cited number (fraction or integer) within the indicated range.

[0027] In the present application, the terms "include", "contain" and the like mean "include but not limited to".

[0028] Unless otherwise specifically stated, the various raw materials, reagents, instruments and equipment, etc. used in the present application can be purchased from the market or can be prepared by existing methods.

[0029] In a first aspect, the present application provides a pour point depressant, the raw material components of the pour point depressant comprising:

[0030] Graphene oxide, acrylic acid and adjuvant; wherein, in terms of mass fraction,

[0031] The content of the graphene oxide is 4% to 14.5%, and the content of the acrylic acid is 38% to 76%.

[0032] In some embodiments, the content of the graphene oxide is 6% to 10%, and the content of the acrylic acid is 60% to 65%.

[0033] In some embodiments, the auxiliary agent further comprises a dispersant, a catalyst, and a solvent.

[0034] In some embodiments, the dispersant comprises one of the following: sodium dodecyl benzene sulfonate, sodium dodecyl sulfate.

[0035] In some embodiments, the catalyst comprises one of the following: sulfuric acid, hydrochloric acid, nitric acid.

[0036] In some embodiments, the solvent comprises one of the following: ethylene glycol, water, ethanol.

[0037] In some embodiments, the content of the dispersant is 4% to 6%, and the content of the catalyst is 1.5% to 2%.

[0038] In some embodiments, the content of the dispersant is 4% to 5%, and the content of the catalyst is 1% to 2%.

[0039] In the embodiments of the present application, the acrylic acid and the graphene oxide are synthesized into esters with a target number of carbon atoms through esterification, which can play a role in wax prevention and pour point depression. By adjusting the amount of acrylic acid, acrylic esters with different carbon numbers can be obtained. According to the principle of similarity and compatibility, the amount of acrylic acid and the number of carbon atoms in the esters synthesized from graphene oxide should be as close as possible to the target number of carbon atoms to achieve good wax prevention and pour point depression effect. Through the study of the performance of the reaction product, the amount of added acrylic acid is determined to obtain the target product within the range. The acrylic acid molecule itself has a carbon-carbon double bond function. In the presence of a catalyst, if the content of the acrylic acid is too high, the possibility of polymerization between acrylic acid molecules will increase, which will increase the length of the carbon chain. If the carbon number is too high, the target product will not be obtained. If the content of the acrylic acid is too low, the target product cannot be obtained. Because the amount of the reactant is too small, the reaction will stop, and the effect of wax prevention and pour point depression cannot be achieved. Exemplarily, the content of the acrylic acid can be 38%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 76%, and the like. Further, the content of the acrylic acid can be 60%, 61%, 62%, 63%, 64%, 65%, and the like.

[0040] The content of the graphene oxide is limited, so that the two reactants of acrylic acid and graphene oxide are less likely to separate during the whole synthesis process, and the acrylic acid and graphene oxide have good compatibility. If the content of the graphene oxide is too high, by-products may be generated; if the content of the graphene oxide is too low, the target product cannot be obtained. The graphene oxide can be plate-shaped graphene oxide, Figure 1 The graphene oxide is provided according to an embodiment of the present application. Please refer to Figure 1 If the content of the plate-shaped graphene oxide is too high, the graphene oxide may precipitate during the synthesis process. In addition, the graphene oxide molecule has two functional groups of carboxyl and hydroxyl, and the molecular steric hindrance is large, which affects the esterification reaction. For example, the content of the graphene oxide can be 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 14.5%, etc. Further, the content of the graphene oxide can be 6%, 7%, 8%, 9%, 10%, etc.

[0041] The dispersant can prevent the dispersion and agglomeration of the graphene oxide during the whole synthesis process. The dispersant can be sodium dodecyl benzene sulfonate or sodium dodecyl sulfate. For example, the content of the dispersant can be 4%, 4.5%, 5%, 5.5%, 6%, etc. Further, the content of the dispersant can be 4%, 4.5%, 5%, etc.

[0042] The appropriate amount of catalyst can accelerate the reaction rate, and the pH can be 5-7. The catalyst can be sulfuric acid, hydrochloric acid, or nitric acid. For example, the content of the catalyst can be 1%, 1.3%, 1.5%, 1.8%, 2%, etc. Further, the content of the catalyst can be 1.5%, 1.8%, 2%, etc. Specifically, when the catalyst is concentrated sulfuric acid, the carboxyl group in the graphene oxide and the hydroxyl group in the acrylic acid will undergo esterification under the action of the concentrated sulfuric acid. The concentrated sulfuric acid is a catalyst and a water absorber. The concentrated sulfuric acid can protonate the carbonyl group in the carboxyl group, enhance the electrophilicity of the carbonyl carbon, and accelerate the reaction rate. In addition, the concentrated sulfuric acid has strong water absorption, and the water generated in the esterification reaction can be absorbed by the concentrated sulfuric acid. Therefore, the introduction of the concentrated sulfuric acid increases the limit of the esterification reaction, and reduces the maximum possibility of the reaction to the reverse reaction.

[0043] In addition, the solvent can be ethylene glycol, water, or ethanol.

[0044] In summary, graphene oxide has the characteristics of nanometer size and high oxygen-containing functional groups, can play a good effect on the pour point depression of heavy oil, and can destroy the continuous state of heavy oil, to a certain extent, can emulsify crude oil to form O / W emulsion, thereby having a good effect on the pour point depression and wax prevention of heavy oil containing resin and asphaltene with high pour point; graphene oxide and acrylic acid undergo esterification reaction under the action of dispersant, catalyst and solvent, there are hydroxyl and carboxyl groups in the chemical structure of graphene oxide, in the esterification reaction, the oxygen atom in the hydroxyl group of graphene oxide will be converted into carbon-oxygen free radical, the carbon-oxygen free radical will add to the double bond in acrylic acid, increase the length of carbon chain, and the hydroxyl group in graphene oxide will esterify with the carboxyl group in acrylic acid at the same time, thereby generating graphene oxide-based acrylic ester high polymer, the graphene oxide-based acrylic ester high polymer can co-crystallize or adsorb wax crystals in heavy oil, so that the crystalline form of paraffin in heavy oil changes, the crystal size becomes smaller, and the structure strength decreases, the wax crystals are not easy to form network structure with each other, effectively preventing the wax crystals from aggregating and growing on the oil pipe wall and the sucker rod, thereby improving the low-temperature fluidity of heavy oil, reducing the yield value of heavy oil, and greatly reducing the pour point of heavy oil.

[0045] The present application is directed to the wax prevention and pour point depression agent synthesized by the conventional pour point depression and wax prevention measures for thin oil, which is not only suitable for the pour point depression and wax prevention of thin oil, but also can be used for the pour point depression and wax prevention of high pour point crude oil caused by resin and asphaltene. The pour point depression and wax prevention agent is especially suitable for crude oil containing 20% to 40% resin and asphaltene.

[0046] Figure 2 A flowchart of a preparation method of a pour point depression and wax prevention agent according to some embodiments of the present application is shown in Figure 2 The present application provides a preparation method of the pour point depression and wax prevention agent according to the first aspect, which comprises:

[0047] S1, mixing and stirring graphene oxide, dispersant and solvent, and then performing ultrasonic treatment to obtain graphene oxide nanofluid;

[0048] S2, chemically reacting the graphene oxide nanofluid, acrylic acid and catalyst to obtain the pour point depression and wax prevention agent.

[0049] In some embodiments, the process parameters of the chemical reaction include: temperature 70-80℃, time 3-4h.

[0050] In the embodiments of the present application, under the conditions of the process parameters of the above chemical reaction, a higher yield of the target product can be obtained. For example, the above temperature can be 70℃, 72, 74, 76, 80℃, and the time can be 3h, 3.2h, 3.4h, 3.6h, 3.8h, 4h, etc. The power of the ultrasonic can be 30Hz-35Hz, and the ultrasonic time can be 3h-3.5h.

[0051] The S2 step further includes: cooling the pour point depressant and wax inhibitor, washing to weak alkaline with saturated sodium carbonate solution, and finally repeatedly washing the agent by centrifugal separation, using saturated brine as the washing liquid, and washing until the whole system is neutral, discarding the upper liquid, and then evaporating the solvent to obtain the finished pour point depressant and wax inhibitor (graphene oxide-based acrylate).

[0052] The finished pour point depressant and wax inhibitor meets the following indexes, please refer to Table 1.

[0053] Table 1: Indexes of the finished pour point depressant and wax inhibitor

[0054]

[0055]

[0056] The preparation method of the pour point depressant and wax inhibitor is based on the above pour point depressant and wax inhibitor, and the specific raw material components of the pour point depressant and wax inhibitor can refer to the above embodiments. Since the preparation method of the pour point depressant and wax inhibitor adopts part or all of the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be described here.

[0057] The present application will be further described below in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present application and not to limit the scope of the present application. The experimental methods in the following examples are not specified, and generally according to the national standard. If there is no corresponding national standard, it is carried out according to the general international standard, the conventional condition, or the condition suggested by the manufacturer.

[0058] Example 1

[0059] A pour point depressant and wax inhibitor, in mass fraction, plate-shaped graphene oxide is 5%, acrylic acid is 40%, sodium dodecyl benzene sulfonate is 4%, sulfuric acid is 1%, and the balance is ethylene glycol.

[0060] A preparation method of a pour point depressant and wax inhibitor, comprising:

[0061] The plate-shaped graphene oxide and sodium dodecyl benzene sulfonate are added into ethylene glycol, stirred for 1 h, then converted into ultrasonic, ultrasonic power 32 Hz, ultrasonic 3 h, to prepare plate-shaped graphene oxide nanofluid, then the whole fluid is introduced into a three-necked flask, then acrylic acid and catalyst are added, heated to 70℃, and reacted for 3.5 h. After the reaction is completed, cooling, washing with saturated sodium carbonate solution to weak alkaline, finally repeatedly washing with centrifugal separation method, washing liquid is saturated brine, washing until the whole system is neutral, the upper liquid is discarded, and the solvent is evaporated to obtain the pour point depressant.

[0062] Example 2

[0063] A pour point depressant, plate-shaped graphene oxide is 10% by mass fraction, acrylic acid is 75%, sodium dodecyl benzene sulfonate is 4%, sulfuric acid is 1%, and the balance is ethylene glycol.

[0064] A preparation method of a pour point depressant, comprising:

[0065] The plate-shaped graphene oxide and sodium dodecyl benzene sulfonate are added into ethylene glycol, stirred for 1 h, then converted into ultrasonic, ultrasonic power 35 Hz, ultrasonic 3.2 h, to prepare plate-shaped graphene oxide nanofluid, then the whole fluid is introduced into a three-necked flask, then acrylic acid and catalyst are added, heated to 72℃, and reacted for 3.5 h. After the reaction is completed, cooling, washing with saturated sodium carbonate solution to weak alkaline, finally repeatedly washing with centrifugal separation method, washing liquid is saturated brine, washing until the whole system is neutral, the upper liquid is discarded, and the solvent is evaporated to obtain the pour point depressant.

[0066] Example 3

[0067] A pour point depressant, plate-shaped graphene oxide is 6% by mass fraction, acrylic acid is 60%, sodium dodecyl benzene sulfonate is 4%, sulfuric acid is 1%, and the balance is ethylene glycol.

[0068] A preparation method of a pour point depressant, comprising:

[0069] The plate-shaped graphene oxide and sodium dodecyl benzene sulfonate are added into ethylene glycol, stirred for 1 h, then converted into ultrasonic, ultrasonic power 30 Hz, ultrasonic 3.5 h, to prepare plate-shaped graphene oxide nanofluid, then the whole fluid is introduced into a three-necked flask, then acrylic acid and catalyst are added, heated to 75℃, and reacted for 3.5 h. After the reaction is completed, cooling, washing with saturated sodium carbonate solution to weak alkaline, finally repeatedly washing with centrifugal separation method, washing liquid is saturated brine, washing until the whole system is neutral, the upper liquid is discarded, and the solvent is evaporated to obtain the pour point depressant.

[0070] Example 4

[0071] A pour point depressant and wax inhibitor, 8% of platelet-shaped graphene oxide, 65% of acrylic acid, 5% of sodium dodecyl benzene sulfonate, 1.5% of sulfuric acid, and the rest of ethylene glycol.

[0072] A preparation method of a pour point depressant and wax inhibitor, comprising:

[0073] Platelet-shaped graphene oxide and sodium dodecyl benzene sulfonate are added into ethylene glycol, stirred for 1h, then converted into ultrasonic, ultrasonic power is 35Hz, ultrasonic for 3h, thereby preparing platelet-shaped graphene oxide nanofluid, the whole fluid is introduced into a three-necked flask, acrylic acid and catalyst are added, heated to 70℃, and reacted for 3.5h. After the reaction is completed, the system is cooled, washed with saturated sodium carbonate solution to weak alkaline, finally repeatedly washed with centrifugal separation method, the washing liquid is saturated brine, and the washing is stopped until the whole system is neutral, the upper liquid is discarded, the solvent is evaporated, and the pour point depressant and wax inhibitor is obtained.

[0074] Example 5

[0075] A pour point depressant and wax inhibitor, 8% of platelet-shaped graphene oxide, 65% of acrylic acid, 5% of sodium dodecyl benzene sulfonate, 1.5% of sulfuric acid, and the rest of ethylene glycol.

[0076] A preparation method of a pour point depressant and wax inhibitor, comprising:

[0077] Platelet-shaped graphene oxide and sodium dodecyl benzene sulfonate are added into ethylene glycol, stirred for 1h, then converted into ultrasonic, ultrasonic power is 33Hz, ultrasonic for 3.5h, thereby preparing platelet-shaped graphene oxide nanofluid, the whole fluid is introduced into a three-necked flask, acrylic acid and catalyst are added, heated to 80℃, and reacted for 3h. After the reaction is completed, the system is cooled, washed with saturated sodium carbonate solution to weak alkaline, finally repeatedly washed with centrifugal separation method, the washing liquid is saturated brine, and the washing is stopped until the whole system is neutral, the upper liquid is discarded, the solvent is evaporated, and the pour point depressant and wax inhibitor is obtained.

[0078] Example 6

[0079] A pour point depressant and wax inhibitor, 8% of platelet-shaped graphene oxide, 65% of acrylic acid, 5% of sodium dodecyl benzene sulfonate, 1.5% of sulfuric acid, and the rest of ethylene glycol.

[0080] A preparation method of a pour point depressant and wax inhibitor, comprising:

[0081] Plate-shaped graphene oxide and sodium dodecylbenzenesulfonate were added to ethylene glycol and stirred for 1 hour. The mixture was then sonicated at 32 Hz for 3.5 hours to prepare plate-shaped graphene oxide nanofluids. The entire fluid was then introduced into a three-necked flask, and acrylic acid and a catalyst were added. The mixture was heated to 80°C and reacted for 3 hours. After the reaction was complete, the mixture was cooled and washed with a saturated sodium carbonate solution until it became weakly alkaline. Finally, the mixture was repeatedly washed by centrifugation with saturated brine until the entire system was neutral. The supernatant was discarded, and the solvent was evaporated to obtain a decondensing and anti-waxing agent.

[0082] Comparative Example 1

[0083] An anti-wax depressant, by mass fraction, comprises 73% acrylic acid, 1.5% sulfuric acid, and the balance being ethylene glycol.

[0084] A method for preparing a pour point depressant and wax inhibitor, comprising:

[0085] Acrylic acid and catalyst were added to a three-necked flask and heated to 70°C, then refluxed for 3.5 hours. After the reaction was complete, the mixture was cooled and washed with a saturated sodium carbonate solution until it became weakly alkaline. Finally, the mixture was repeatedly washed using a separation method, with the washing solution being washed with saturated brine until the system was neutral. The supernatant was discarded, and the solvent was evaporated to obtain the decondensing and anti-waxing agent.

[0086] Comparative Example 2

[0087] A dewaxing and anti-waxing agent, by mass fraction, comprises 25% plate-shaped graphene oxide, 45% acrylic acid, 6% sodium dodecylbenzenesulfonate, 1.5% sulfuric acid, and the balance being ethylene glycol.

[0088] A method for preparing a pour point depressant and wax inhibitor, comprising:

[0089] Plate-like graphene oxide and sodium dodecylbenzenesulfonate were added to ethylene glycol and stirred for 1 hour. The mixture was then subjected to ultrasonication at 30 Hz for 3.5 hours to prepare plate-like graphene oxide nanofluids. The entire fluid was then introduced into a three-necked flask, and acrylic acid and a catalyst were added. The mixture was heated to 70°C and reacted for 3.5 hours. After the reaction, the mixture was cooled and washed with a saturated sodium carbonate solution until it became weakly alkaline. Finally, the mixture was repeatedly washed by centrifugation, and the washing solution was washed with saturated brine until the entire system was nearly neutral. The supernatant was discarded, and the solvent was evaporated to obtain a decondensing and anti-waxing agent.

[0090] The pour point depressants and wax inhibitors prepared in Examples 1-6 and Comparative Examples 1-2 were evaluated for their effect on crude oil with a resin and asphaltene content of 39.2% and a pour point of 38°C. The evaluation results are shown in Table 2.

[0091] Table 2 Evaluation results of pour point depressants and wax inhibitors on crude oil pour point depressing and wax inhibition.

[0092] Serial number Pour point depression, °C Paraffin control rate, % Example 1 13 54 Example 2 14 53 Example 3 16 70 Example 4 17 71 Example 5 17 67 Example 6 12 55 Comparative Example 1 4 38 Comparative Example 2 6 45

[0093] In summary, the pour point depressant and the anti-waxing agent provided by the embodiments of the present application have good pour point depressing and anti-waxing effects on heavy oil with high pour point caused by more gum and asphaltene. The raw materials of the pour point depressing and anti-waxing agent in Comparative Example 1 do not use plate-shaped graphene oxide, and the content of plate-shaped graphene oxide in the raw materials of the pour point depressing and anti-waxing agent in Comparative Example 2 is too high, which to some extent makes the pour point depressing and anti-waxing effect of the pour point depressing and anti-waxing agent in the comparative examples worse than that of the embodiments.

[0094] The above description is merely that of the specific embodiments of the present application, to enable a person skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features requested in the present application.

Claims

1. A deplacing agent and anti-waxing agent, characterized in that, The raw material components of the deplacing and wax-inhibiting agent include: Graphene oxide, acrylic acid, and additives; wherein, by mass fraction, The content of graphene oxide is 4% to 14.5%, and the content of acrylic acid is 38% to 76%.

2. The depressant and anti-waxing agent according to claim 1, characterized in that, The content of graphene oxide is 6% to 10%, and the content of acrylic acid is 60% to 65%.

3. The depressant and anti-waxing agent according to claim 1, characterized in that, The additives also include dispersants, catalysts, and solvents.

4. The depressant and anti-waxing agent according to claim 3, characterized in that, The dispersant includes one of the following: sodium dodecylbenzenesulfonate or sodium dodecyl sulfate.

5. The deplacing and wax-inhibiting agent according to claim 3, characterized in that, The catalyst includes one of the following: sulfuric acid, hydrochloric acid, or nitric acid.

6. The deplacing and wax-inhibiting agent according to claim 3, characterized in that, The solvent includes one of the following: ethylene glycol, water, or ethanol.

7. The deplacing agent and anti-waxing agent according to claim 3, characterized in that, The content of the dispersant is 4% to 6%, and the content of the catalyst is 1% to 2%.

8. The deplacing and wax-inhibiting agent according to claim 7, characterized in that, The content of the dispersant is 4% to 5%, and the content of the catalyst is 1.5% to 2%.

9. A method for preparing the depressant and anti-waxing agent according to any one of claims 1 to 8, characterized in that, The method includes: Graphene oxide, dispersant, and solvent are mixed and stirred, and then ultrasonicated to obtain graphene oxide nanofluid. The graphene oxide nanofluid, acrylic acid, and catalyst are chemically reacted to obtain a decondensing and wax-inhibiting agent.

10. The depressant and anti-waxing agent according to claim 9, characterized in that, The process parameters for the chemical reaction include: temperature 70℃~80℃, time 3h~4h.

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