CN114015428A - Composite pour point and viscosity reducing dehydrating agent for oil extraction and preparation method thereof - Google Patents
Composite pour point and viscosity reducing dehydrating agent for oil extraction and preparation method thereof Download PDFInfo
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- 239000012024 dehydrating agents Substances 0.000 title claims abstract description 57
- 230000001603 reducing effect Effects 0.000 title claims abstract description 56
- 239000002131 composite material Substances 0.000 title claims abstract description 55
- 238000000605 extraction Methods 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title abstract description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 87
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims abstract description 57
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000002283 diesel fuel Substances 0.000 claims abstract description 33
- 229940051841 polyoxyethylene ether Drugs 0.000 claims abstract description 30
- 229920000056 polyoxyethylene ether Polymers 0.000 claims abstract description 30
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 28
- WBIQQQGBSDOWNP-UHFFFAOYSA-N 2-dodecylbenzenesulfonic acid Chemical compound CCCCCCCCCCCCC1=CC=CC=C1S(O)(=O)=O WBIQQQGBSDOWNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229940060296 dodecylbenzenesulfonic acid Drugs 0.000 claims abstract description 27
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 27
- 239000007864 aqueous solution Substances 0.000 claims abstract description 25
- 229960000583 acetic acid Drugs 0.000 claims abstract description 21
- 239000012362 glacial acetic acid Substances 0.000 claims abstract description 21
- 235000006408 oxalic acid Nutrition 0.000 claims abstract description 19
- 239000011259 mixed solution Substances 0.000 claims description 125
- 238000002156 mixing Methods 0.000 claims description 47
- 238000011084 recovery Methods 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 16
- 229940116315 oxalic acid Drugs 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 7
- 239000003921 oil Substances 0.000 abstract description 61
- 239000010779 crude oil Substances 0.000 abstract description 56
- 239000013078 crystal Substances 0.000 abstract description 21
- 230000009467 reduction Effects 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 19
- 230000018044 dehydration Effects 0.000 abstract description 17
- 238000006297 dehydration reaction Methods 0.000 abstract description 17
- 230000000881 depressing effect Effects 0.000 abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 14
- 239000002994 raw material Substances 0.000 abstract description 7
- 239000001993 wax Substances 0.000 description 22
- 230000008859 change Effects 0.000 description 9
- 238000003756 stirring Methods 0.000 description 8
- 239000003638 chemical reducing agent Substances 0.000 description 7
- 230000000994 depressogenic effect Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000000084 colloidal system Substances 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000000151 deposition Methods 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
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- 239000002245 particle Substances 0.000 description 3
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- 239000013543 active substance Substances 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000004931 aggregating effect Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical group C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012208 gear oil Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/602—Compositions for stimulating production by acting on the underground formation containing surfactants
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
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Abstract
The invention relates to the technical field of oil extraction, pour point depression and viscosity reduction, in particular to a composite pour point depression and viscosity reduction dehydrating agent for oil extraction and a preparation method thereof; the former raw materials comprise, by weight, 200 parts of dodecylbenzene sulfonic acid, 100 to 110 parts of glacial acetic acid or oxalic acid, 425 to 440 parts of diesel oil, 80 to 85 parts of ethylene-vinyl acetate copolymer, 110 to 130 parts of sodium hydroxide aqueous solution with the mass percent of 50%, 50 parts of polyoxyethylene ether and 100 parts of sulfurized isobutylene. The composite pour point depressing and viscosity reducing dehydrating agent for oil extraction has no strict requirement on the water content of crude oil, has better pour point depressing and viscosity reducing effects compared with the existing pour point depressants, and can prevent wax crystals from growing and increase the fluidity of the crude oil by virtue of polyoxyethylene ether and sulfurized isobutylene in the raw materials. Meanwhile, when the composite pour point depressing and viscosity reducing dehydrating agent for oil extraction is used in combination with the demulsifier in the prior art, the dehydration rate of crude oil can reach more than 92 percent, and the dehydration effect is good.
Description
Technical Field
The invention relates to the technical field of oil extraction pour point depression and viscosity reduction, in particular to a composite pour point depression and viscosity reduction dehydrating agent for oil extraction and a preparation method thereof.
Background
The high-condensation and high-viscosity crude oil in China has abundant reserves, the crude oil has high viscosity and high solidification point and is difficult to recover and convey, especially the crude oil has high difficulty in conveying and treating at low temperature, the phenomena of over-high back pressure and pipe condensation are easily caused in production, the crude oil enters a treatment station to influence one-stage sedimentation and dehydration and directly influence the treatment and oil exchange of the later-stage flow, mainly because the crude oil contains a mixture of various complex hydrocarbons such as paraffin, colloid and asphaltene, and the like, and the characteristics of high crude oil density, high solidification point, high viscosity, difficult flowing and the like caused by the existence of the paraffin, the colloid and the asphaltene in the crude oil seriously restrict the recovery and conveying of the thick oil and the crude oil and influence the later-stage crude oil dehydration.
Wax crystals precipitate at low temperatures due to the presence of wax in crude oil, and bond with each other to form a three-dimensional network structure, and colloids, asphaltenes, and the like adsorb around and reduce or lose fluidity of crude oil, thereby causing difficulty in transportation, and generally, when the viscosity of crude oil is 1000 mpa · s or less, the crude oil is advantageous in fluidity. The flow of crude oil is related to the solidification point and viscosity of crude oil, different single wells of the produced crude oil have different water contents and different crude oil activities in different blocks, so that the crude oil can form an emulsion with external phase and water in the oil, wax crystals are precipitated and bonded with each other along with the change of production temperature and pressure in the production process, the viscosity of the crude oil is increased, the mobility is reduced, the transportation difficulty is caused, a plurality of transportation methods (heat treatment, drag reducer addition, dilution and the like) are adopted for improving the mobility of the waxy crude oil, but the methods have the problems of high energy consumption, high management cost and difficulty in starting after transportation is stopped. Currently used agents that increase the flow of crude oil are: 1. a crude oil flow modifier; 2. a viscosity reducer for thickened oil; 3. and (4) a pour point depressant. However, at present, the three medicaments have limitations when used in the field.
Pour point depressants mainly used at present are: ethylene-vinyl acetate copolymers; acrylic acid high-carbon alcohol ester-maleic anhydride-vinyl acetate terpolymer; acrylate-methacrylate copolymer and the like, but most of the existing pour point depressants are oil-soluble, have strict requirements on the water content of crude oil, have poor water solubility of the pour point depressing viscosity reducer, have poor solubility and have broken medicament effects under the condition that produced liquid contains water, are mainly used for pipeline transportation of dehydrated crude oil and finished oil, are influenced by various aspects such as water content, temperature change and pressure change in the oil well production process and the like when the produced liquid (water-containing crude oil) is used, have the effect which cannot meet the field use requirements, and have obvious pour point depressing and viscosity reducing effects. CN106281289A discloses a pour point depressing, viscosity reducing and dehydrating agent for oil extraction, which has no strict requirement on the water content of crude oil, but has a good effect on the treatment of wax crystallization, aggregation and deposition of crude oil. In the existing pour point and viscosity reducing agent, an active agent is added to mainly prevent wax crystals from growing up, the material can be attached to the surface of wax crystal particles to form a layer of film to prevent wax crystals from gathering and growing up, so that the wax crystals in a particle state can be dispersed in oil to prevent wax crystals from being bonded with each other to form a net structure, the film can be attached to the surface of a pipe to form a layer of film to play a role in inhibiting the deposition of the wax crystals, and a certain pour point and viscosity reducing effect is achieved. Although a certain effect is obtained in practical application, in the process of pour point and viscosity reduction of the existing pour point and viscosity reduction viscosity reducer, the effect is poor due to dilution of an added active agent by oil water, and meanwhile, because the property or state of the surfactant at a phase interface can change along with the change of temperature, a layer of film formed by the surfactant attached to the surface of an oil pipe can also change along with the change of temperature, so that the adaptability of the pour point and viscosity reduction viscosity reducer to the temperature is not wide. Therefore, it is important to produce a high-performance composite pour point and viscosity reducing dehydrating agent to solve the problems.
Disclosure of Invention
The invention provides a composite pour point and viscosity reduction dehydrating agent for oil extraction and a preparation method thereof, overcomes the defects of the prior art, and can effectively solve the problems of poor flowability and high difficulty in pour point and viscosity reduction of crude oil caused by wax crystals in the prior crude oil.
One of the technical schemes of the invention is realized by the following measures: the composite pour point and viscosity reducing dehydrating agent for oil production is prepared with dodecyl benzene sulfonic acid 200 weight portions, glacial acetic acid or oxalic acid 100-110 weight portions, diesel oil 425-440 weight portions, ethylene-vinyl acetate copolymer 80-85 weight portions, sodium hydroxide aqua in 50 wt% 110-130 weight portions, polyoxyethylene ether 50 weight portions and sulfurized isobutylene 100 weight portions.
The following is a further optimization or/and improvement of one of the above-mentioned technical solutions of the invention:
the composite pour point and viscosity reducing dehydrating agent for oil extraction is obtained by the following method: step one, uniformly mixing dodecyl benzene sulfonic acid and glacial acetic acid or oxalic acid to obtain a first mixed solution; secondly, dropwise adding a 50% sodium hydroxide aqueous solution in the first mixed solution and uniformly mixing to obtain a second mixed solution; step three, uniformly mixing the ethylene-vinyl acetate copolymer and diesel oil to obtain a third mixed solution; step four, uniformly mixing the second mixed solution and the third mixed solution to obtain a fourth mixed solution; and fifthly, sequentially adding polyoxyethylene ether and sulfurized isobutylene into the fourth mixed solution at the temperature of 40-50 ℃ to obtain the composite pour point and viscosity reducing dehydrating agent for oil recovery.
The composite pour point and viscosity reducing dehydrating agent for oil extraction is obtained by the following method: step one, uniformly mixing dodecylbenzene sulfonic acid, glacial acetic acid or oxalic acid and diesel oil with the mass of 0.5 time that of the dodecylbenzene sulfonic acid to obtain a first mixed solution; secondly, dropwise adding a 50% sodium hydroxide aqueous solution in the first mixed solution and uniformly mixing to obtain a second mixed solution; step three, uniformly mixing the ethylene-vinyl acetate copolymer with the rest diesel oil to obtain a third mixed solution; step four, uniformly mixing the second mixed solution and the third mixed solution to obtain a fourth mixed solution; and fifthly, sequentially adding polyoxyethylene ether and sulfurized isobutylene into the fourth mixed solution at the temperature of 40-50 ℃ to obtain the composite pour point and viscosity reducing dehydrating agent for oil recovery.
In the second step, the temperature of the first mixed solution is controlled between 80 ℃ and 90 ℃ in the process of adding 50% by mass of sodium hydroxide aqueous solution.
In the second step, a 50% by mass aqueous solution of sodium hydroxide is divided into 5 to 10 parts and added dropwise to the first mixed solution in portions.
In the third step, the mixing process of the ethylene-vinyl acetate copolymer and the diesel oil is carried out at the temperature of 58 ℃ to 62 ℃.
The second technical scheme of the invention is realized by the following measures: a preparation method of a composite pour point and viscosity reduction dehydrating agent for oil extraction comprises the following steps: step one, uniformly mixing dodecyl benzene sulfonic acid and glacial acetic acid or oxalic acid to obtain a first mixed solution; secondly, dropwise adding a 50% sodium hydroxide aqueous solution in the first mixed solution and uniformly mixing to obtain a second mixed solution; step three, uniformly mixing the ethylene-vinyl acetate copolymer and diesel oil to obtain a third mixed solution; step four, uniformly mixing the second mixed solution and the third mixed solution to obtain a fourth mixed solution; and fifthly, sequentially adding polyoxyethylene ether and sulfurized isobutylene into the fourth mixed solution at the temperature of 40-50 ℃ to obtain the composite pour point and viscosity reducing dehydrating agent for oil recovery.
The third technical scheme of the invention is realized by the following measures: a preparation method of a composite pour point and viscosity reduction dehydrating agent for oil extraction comprises the following steps: step one, uniformly mixing dodecylbenzene sulfonic acid, glacial acetic acid or oxalic acid and diesel oil with the mass of 0.5 time that of the dodecylbenzene sulfonic acid to obtain a first mixed solution; secondly, dropwise adding a 50% sodium hydroxide aqueous solution in the first mixed solution and uniformly mixing to obtain a second mixed solution; step three, uniformly mixing the ethylene-vinyl acetate copolymer with the rest diesel oil to obtain a third mixed solution; step four, uniformly mixing the second mixed solution and the third mixed solution to obtain a fourth mixed solution; and fifthly, sequentially adding polyoxyethylene ether and sulfurized isobutylene into the fourth mixed solution at the temperature of 40-50 ℃ to obtain the composite pour point and viscosity reducing dehydrating agent for oil recovery.
In conclusion, the composite pour point and viscosity reducing dehydrating agent for oil extraction has no strict requirement on the water content of crude oil, has better pour point and viscosity reducing effects than the conventional pour point depressant, and can prevent wax crystals from growing and increase the fluidity of the crude oil by virtue of the polyoxyethylene ether and the sulfurized isobutylene in the raw materials. Meanwhile, when the composite pour point depressing and viscosity reducing dehydrating agent for oil extraction is used in combination with the demulsifier in the prior art, the dehydration rate of crude oil can reach more than 92 percent, and the dehydration effect is good.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
Example 1: the composite pour point and viscosity reducing dehydrating agent for oil extraction comprises, by weight, 200 parts of dodecylbenzene sulfonic acid, 100 to 110 parts of glacial acetic acid or oxalic acid, 425 to 440 parts of diesel oil, 80 to 85 parts of ethylene-vinyl acetate copolymer, 110 to 130 parts of sodium hydroxide aqueous solution with the mass percent of 50%, 50 parts of polyoxyethylene ether and 100 parts of sulfurized isobutylene.
In the invention, the polyoxyethylene ether and the sulfurized isobutylene added in the raw materials have good effect of preventing wax crystal growth, and the raw materials have good solubility in the water-containing crude oil. The polyoxyethylene ether can extract liquid oil outward emulsion and convert the liquid oil outward emulsion into water outward emulsion so as to reduce the viscosity of crude oil and achieve a certain dehydration effect, and meanwhile, the polyoxyethylene ether can be attached to the surface of wax crystal particles to form a layer of film so as to prevent wax crystals from aggregating and growing up, and the polyoxyethylene ether can also be attached to the surface of an oil pipe to form a layer of film so as to play a role in hindering the deposition of wax crystals. The sulfurized isobutylene can generate good antiwear effect under the synergistic action of the prepared gear oil, the antiwear hydraulic oil and the lubricating ester. Wax crystals in the crude oil are gradually separated out along with the reduction of temperature in the process of crude oil exploitation, a stable film can be formed on the surface of the wax crystals by adding the sulfurized isobutylene, the wax crystals are reduced from being bonded with each other to grow up, a reticular structure is damaged, the pour point depression effect is achieved, a film is formed on the pipe wall, the frictional resistance is reduced, and the conveying performance is improved. In addition, the film formed by the sulfurized isobutylene is insensitive to temperature change, and can still keep higher effect with the film formed between the pipe wall or the oil rod, the wax crystal and the wax crystal even under the condition of larger temperature difference change, thereby ensuring the high-efficiency and normal production.
The composite pour point depressing and viscosity reducing dehydrating agent for oil extraction is added into the extracted crude oil, so that the freezing point of the extracted crude oil can be lowered by 19-23 ℃, the viscosity reducing rate near the freezing point of the crude oil can reach more than 98 percent, and the later-stage dehydration of the crude oil is not influenced.
Example 2:
the composite pour point and viscosity reducing dehydrating agent for oil extraction comprises, by weight, 200 parts of dodecylbenzene sulfonic acid, 100 parts or 110 parts of glacial acetic acid or oxalic acid, 425 parts or 440 parts of diesel oil, 80 parts or 85 parts of ethylene-vinyl acetate copolymer, 110 parts or 130 parts of sodium hydroxide aqueous solution with the mass percentage of 50%, 50 parts of polyoxyethylene ether and 100 parts of sulfurized isobutylene.
Example 3:
the composite pour point and viscosity reducing dehydrating agent for oil extraction is prepared by the following preparation method: step one, uniformly mixing dodecyl benzene sulfonic acid and glacial acetic acid or oxalic acid to obtain a first mixed solution; secondly, dropwise adding a 50% sodium hydroxide aqueous solution in the first mixed solution and uniformly mixing to obtain a second mixed solution; step three, uniformly mixing the ethylene-vinyl acetate copolymer and diesel oil to obtain a third mixed solution; step four, uniformly mixing the second mixed solution and the third mixed solution to obtain a fourth mixed solution; and fifthly, sequentially adding polyoxyethylene ether and sulfurized isobutylene into the fourth mixed solution at the temperature of 40-50 ℃ to obtain the composite pour point and viscosity reducing dehydrating agent for oil recovery.
Example 4: the composite pour point and viscosity reducing dehydrating agent for oil extraction is prepared by the following preparation method: step one, uniformly mixing dodecylbenzene sulfonic acid, glacial acetic acid or oxalic acid and diesel oil with the mass of 0.5 time that of the dodecylbenzene sulfonic acid to obtain a first mixed solution; secondly, dropwise adding a 50% sodium hydroxide aqueous solution in the first mixed solution and uniformly mixing to obtain a second mixed solution; step three, uniformly mixing the ethylene-vinyl acetate copolymer with the rest diesel oil to obtain a third mixed solution; step four, uniformly mixing the second mixed solution and the third mixed solution to obtain a fourth mixed solution; and fifthly, sequentially adding polyoxyethylene ether and sulfurized isobutylene into the fourth mixed solution at the temperature of 40-50 ℃ to obtain the composite pour point and viscosity reducing dehydrating agent for oil recovery.
Example 5:
as an optimization of the above embodiment, in the second step, the temperature of the first mixed solution is controlled to be 80 to 90 ℃ during the addition of the 50% by mass aqueous sodium hydroxide solution.
Example 6:
as an optimization of the above embodiment, in the second step, a 50% by mass aqueous solution of sodium hydroxide is divided into 5 to 10 parts and added dropwise to the first mixed solution in portions.
Example 7:
as the third step of the optimization of the above embodiment, the mixing process of the ethylene-vinyl acetate copolymer and the diesel oil is carried out at a temperature of 58 ℃ to 62 ℃.
In the method, dodecylbenzene sulfonic acid, glacial acetic acid (or oxalic acid) and sodium hydroxide aqueous solution react to mainly form a mixed sodium salt and ester mixture. The proportion of dodecyl benzene sulfonic acid and glacial acetic acid or oxalic acid has strict requirements, the condensation and viscosity reduction effects of reaction products are different in the subsequent reaction process according to different proportions, different influences are caused on the later-stage crude oil dehydration, the final condensation reduction effect of products formed by excessively large amount of dodecyl benzene sulfonic acid is reduced, and the later-stage crude oil dehydration is influenced after the products are used; the final pour point depressing effect of the product formed by excessive glacial acetic acid (or oxalic acid) is reduced. Particularly, when the sodium hydroxide aqueous solution is dropwise added into the first mixed solution, the dropping speed and the dropping amount must be controlled, the reaction is too rapid when the dropping speed is too fast, the temperature rises too fast, the final reaction product cannot be well controlled to meet the final pour point depression requirement, and the reaction is too violent and is easy to cause danger. Therefore, the dropping speed of the sodium hydroxide solution should be controlled according to the temperature of the first mixed solution, and the sodium hydroxide solution is added into the first mixed solution a plurality of times in small amount. In addition, during specific operation, the adding amount of the diesel oil dissolved ethylene-vinyl acetate copolymer can be adjusted according to the activity of crude oil of an oil well and the content of colloid asphaltene.
Example 8:
the composite pour point and viscosity reducing dehydrating agent for oil extraction is prepared by the following preparation method: step one, 200g of dodecylbenzene sulfonic acid is added into a 500mL four-mouth bottle with a thermometer and a stirrer, 100g of glacial acetic acid is added, and the stirrer is started to stir uniformly to obtain a first mixed solution; secondly, controlling the temperature of the first mixed solution at 83 ℃, and dropwise adding 110g of 50% sodium hydroxide aqueous solution in percentage by mass into the first mixed solution to obtain a second mixed solution; step three, adding 425g of diesel oil into a four-mouth bottle, adding 80g of ethylene-vinyl acetate copolymer, and stirring at the temperature of 60 ℃ until the mixture is completely dissolved to obtain a third mixed solution; step four, uniformly mixing the second mixed solution and the third mixed solution to obtain a fourth mixed solution; and fifthly, sequentially adding 50g of polyoxyethylene ether and 100g of sulfurized isobutylene into the fourth mixed solution at the temperature of 40-50 ℃ to obtain the composite pour point and viscosity reducing dehydrating agent for oil recovery.
Example 9:
the composite pour point and viscosity reducing dehydrating agent for oil extraction is prepared by the following preparation method: step one, 200g of dodecylbenzene sulfonic acid is added into a 500mL four-mouth bottle with a thermometer and a stirrer, 100g of oxalic acid is added, and the stirrer is started to stir uniformly to obtain a first mixed solution; secondly, controlling the temperature of the first mixed solution at 85 ℃, and dropwise adding 130g of 50% sodium hydroxide aqueous solution by mass into the first mixed solution to obtain a second mixed solution; step three, adding 430g of diesel oil and 80g of ethylene-vinyl acetate copolymer into a four-mouth bottle, and stirring at the temperature of 60 ℃ until the diesel oil and the ethylene-vinyl acetate copolymer are completely dissolved to obtain a third mixed solution; step four, uniformly mixing the second mixed solution and the third mixed solution to obtain a fourth mixed solution; and fifthly, sequentially adding 50g of polyoxyethylene ether and 100g of sulfurized isobutylene into the fourth mixed solution at the temperature of 40-50 ℃ to obtain the composite pour point and viscosity reducing dehydrating agent for oil recovery.
Example 10:
the composite pour point and viscosity reducing dehydrating agent for oil extraction is prepared by the following preparation method: step one, 200g of dodecylbenzene sulfonic acid is added into a 500mL four-mouth bottle with a thermometer and a stirrer, 100g of glacial acetic acid and 100g of diesel oil are added, and the stirrer is started to stir uniformly to obtain a first mixed solution; secondly, controlling the temperature of the first mixed solution at 88 ℃, and dropwise adding 120g of 50% sodium hydroxide aqueous solution by mass into the first mixed solution to obtain a second mixed solution; step three, adding 330g of diesel oil and 83g of ethylene-vinyl acetate copolymer into a four-mouth bottle, and stirring at the temperature of 60 ℃ until the diesel oil and the ethylene-vinyl acetate copolymer are completely dissolved to obtain a third mixed solution; step four, uniformly mixing the second mixed solution and the third mixed solution to obtain a fourth mixed solution; and fifthly, sequentially adding 50g of polyoxyethylene ether and 100g of sulfurized isobutylene into the fourth mixed solution at the temperature of 40-50 ℃ to obtain the composite pour point and viscosity reducing dehydrating agent for oil recovery.
Example 11:
the composite pour point and viscosity reducing dehydrating agent for oil extraction is prepared by the following preparation method: step one, 200g of dodecylbenzene sulfonic acid is added into a 500mL four-mouth bottle with a thermometer and a stirrer, 105g of glacial acetic acid and 100g of diesel oil are added, and the stirrer is started to stir uniformly to obtain a first mixed solution; secondly, controlling the temperature of the first mixed solution to be 87 ℃, and dropwise adding 125g of 50% sodium hydroxide aqueous solution by mass into the first mixed solution to obtain a second mixed solution; step three, adding 330g of diesel oil and 83g of ethylene-vinyl acetate copolymer into a four-mouth bottle, and stirring at the temperature of 60 ℃ until the diesel oil and the ethylene-vinyl acetate copolymer are completely dissolved to obtain a third mixed solution; step four, uniformly mixing the second mixed solution and the third mixed solution to obtain a fourth mixed solution; and fifthly, sequentially adding 50g of polyoxyethylene ether and 100g of sulfurized isobutylene into the fourth mixed solution at the temperature of 40-50 ℃ to obtain the composite pour point and viscosity reducing dehydrating agent for oil recovery.
Example 12: the difference from the embodiment 9 is that the composite pour point and viscosity reducing dehydrating agent for oil recovery does not add sulfurized isobutylene.
The experiments of the composite pour point and viscosity reduction dehydrating agent for oil extraction and the existing pour point depressant obtained in the embodiments 8 to 12 of the invention on the pour point and viscosity reduction of the high-pour-point high-viscosity crude oil of the Clarity oil field are shown in Table 1, wherein the existing pour point depressant is an ethylene vinyl acetate pour point depressant. As can be seen from Table 1, when the compound pour point and viscosity reduction dehydrating agent for oil recovery in the embodiments 8 to 11 of the invention is added with the concentration of drug at 100mg/L, the solidification point of the crude oil is reduced by 19 ℃ to 23 ℃, and the viscosity reduction rate of the solidification point of the crude oil is 98.3 percent to 98.9 percent. The results of the experiments of performing pour point depression and viscosity reduction on the high-viscosity and high-viscosity crude oil of the Clarity oil field in example 12 show that the viscosity reduction rate can be improved by more than 4 percent after the sulfurized isobutylene is added into the raw material.
The results of experiments on the dehydration of high-viscosity and high-viscosity crude oil in a kramayi oil field by using the composite pour point depressing and viscosity reducing dehydrating agent for oil extraction of examples 8 to 11 of the invention and the conventional polyoxyethylene ether demulsifier are shown in table 2, and the comparative example in table 2 is the experiment results of dehydration of high-viscosity and high-viscosity crude oil in a kramayi oil field by using the conventional polyoxyethylene ether demulsifier without adding the composite pour point depressing and viscosity reducing dehydrating agent for oil extraction of the invention according to normal dehydration. As can be seen from Table 2, when the composite pour point depressing and viscosity reducing dehydrating agent for oil extraction is used in combination with the existing polyoxyethylene ether demulsifier, the composite pour point depressing and viscosity reducing dehydrating agent for oil extraction is placed at a constant temperature of 45-60 ℃ for 2 hours, and the dehydration rate of crude oil can reach more than 92 percent, which shows that the composite pour point depressing and viscosity reducing dehydrating agent for oil extraction is better in dehydration effect than the single existing polyoxyethylene ether demulsifier.
In conclusion, the composite pour point and viscosity reducing dehydrating agent for oil extraction has no strict requirement on the water content of crude oil, has better pour point and viscosity reducing effects than the conventional pour point depressant, and can prevent wax crystals from growing and increase the fluidity of the crude oil by virtue of the polyoxyethylene ether and the sulfurized isobutylene in the raw materials. Meanwhile, when the composite pour point depressing and viscosity reducing dehydrating agent for oil extraction is used in combination with the demulsifier in the prior art, the dehydration rate of crude oil can reach more than 92 percent, and the dehydration effect is good.
The technical characteristics form an embodiment of the invention, which has strong adaptability and implementation effect, and unnecessary technical characteristics can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (8)
1. The composite pour point and viscosity reducing dehydrating agent for oil extraction is characterized by comprising 200 parts by weight of dodecyl benzene sulfonic acid, 100 to 110 parts by weight of glacial acetic acid or oxalic acid, 425 to 440 parts by weight of diesel oil, 80 to 85 parts by weight of ethylene-vinyl acetate copolymer, 110 to 130 parts by weight of 50% sodium hydroxide aqueous solution, 50 parts by weight of polyoxyethylene ether and 100 parts by weight of sulfurized isobutylene.
2. The composite pour point and viscosity reducing dehydrating agent for oil recovery according to claim 1, which is obtained by the following method: step one, uniformly mixing dodecyl benzene sulfonic acid and glacial acetic acid or oxalic acid to obtain a first mixed solution; secondly, dropwise adding a 50% sodium hydroxide aqueous solution in the first mixed solution and uniformly mixing to obtain a second mixed solution; step three, uniformly mixing the ethylene-vinyl acetate copolymer and diesel oil to obtain a third mixed solution; step four, uniformly mixing the second mixed solution and the third mixed solution to obtain a fourth mixed solution; and fifthly, sequentially adding polyoxyethylene ether and sulfurized isobutylene into the fourth mixed solution at the temperature of 40-50 ℃ to obtain the composite pour point and viscosity reducing dehydrating agent for oil recovery.
3. The composite pour point and viscosity reducing dehydrating agent for oil recovery according to claim 1, which is obtained by the following method: step one, uniformly mixing dodecylbenzene sulfonic acid, glacial acetic acid or oxalic acid and diesel oil with the mass of 0.5 time that of the dodecylbenzene sulfonic acid to obtain a first mixed solution; secondly, dropwise adding a 50% sodium hydroxide aqueous solution in the first mixed solution and uniformly mixing to obtain a second mixed solution; step three, uniformly mixing the ethylene-vinyl acetate copolymer with the rest diesel oil to obtain a third mixed solution; step four, uniformly mixing the second mixed solution and the third mixed solution to obtain a fourth mixed solution; and fifthly, sequentially adding polyoxyethylene ether and sulfurized isobutylene into the fourth mixed solution at the temperature of 40-50 ℃ to obtain the composite pour point and viscosity reducing dehydrating agent for oil recovery.
4. The composite pour point and viscosity reducing dehydrating agent for oil recovery according to claim 2 or 3, wherein in the second step, the temperature of the first mixed solution is controlled to be 80 ℃ to 90 ℃ in the process of adding 50% by mass of sodium hydroxide aqueous solution.
5. The composite pour point and viscosity reducing dehydrating agent for oil recovery according to claim 2, 3 or 4, wherein in the second step, a 50% sodium hydroxide aqueous solution is divided into 5 to 10 parts by mass, and added dropwise to the first mixed solution in batches.
6. The composite pour point and viscosity reducing dehydrating agent for oil recovery according to any one of claims 2 to 5, wherein the mixing process of the ethylene-vinyl acetate copolymer and the diesel oil is performed at a temperature of 58 ℃ to 62 ℃ in the third step.
7. A method for preparing the composite pour point and viscosity reducing dehydrating agent for oil recovery according to claim 1, 4, 5 or 6, which is characterized by comprising the following steps: step one, uniformly mixing dodecyl benzene sulfonic acid and glacial acetic acid or oxalic acid to obtain a first mixed solution; secondly, dropwise adding a 50% sodium hydroxide aqueous solution in the first mixed solution and uniformly mixing to obtain a second mixed solution; step three, uniformly mixing the ethylene-vinyl acetate copolymer and diesel oil to obtain a third mixed solution; step four, uniformly mixing the second mixed solution and the third mixed solution to obtain a fourth mixed solution; and fifthly, sequentially adding polyoxyethylene ether and sulfurized isobutylene into the fourth mixed solution at the temperature of 40-50 ℃ to obtain the composite pour point and viscosity reducing dehydrating agent for oil recovery.
8. A method for preparing the composite pour point and viscosity reducing dehydrating agent for oil recovery according to claim 1, 4, 5 or 6, which is characterized by comprising the following steps: step one, uniformly mixing dodecylbenzene sulfonic acid, glacial acetic acid or oxalic acid and diesel oil with the mass of 0.5 time that of the dodecylbenzene sulfonic acid to obtain a first mixed solution; secondly, dropwise adding a 50% sodium hydroxide aqueous solution in the first mixed solution and uniformly mixing to obtain a second mixed solution; step three, uniformly mixing the ethylene-vinyl acetate copolymer with the rest diesel oil to obtain a third mixed solution; step four, uniformly mixing the second mixed solution and the third mixed solution to obtain a fourth mixed solution; and fifthly, sequentially adding polyoxyethylene ether and sulfurized isobutylene into the fourth mixed solution at the temperature of 40-50 ℃ to obtain the composite pour point and viscosity reducing dehydrating agent for oil recovery.
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| CN111410947A (en) * | 2020-03-20 | 2020-07-14 | 克拉玛依新科澳实验检测有限公司 | Composite wax-proofing agent and preparation method thereof |
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| CN106281289A (en) * | 2016-08-18 | 2017-01-04 | 克拉玛依新科澳石油天然气技术股份有限公司 | Recover the oil with pour-viscosity reduction dehydrant and preparation method thereof |
| CN111410947A (en) * | 2020-03-20 | 2020-07-14 | 克拉玛依新科澳实验检测有限公司 | Composite wax-proofing agent and preparation method thereof |
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| CN106281289A (en) * | 2016-08-18 | 2017-01-04 | 克拉玛依新科澳石油天然气技术股份有限公司 | Recover the oil with pour-viscosity reduction dehydrant and preparation method thereof |
| CN111410947A (en) * | 2020-03-20 | 2020-07-14 | 克拉玛依新科澳实验检测有限公司 | Composite wax-proofing agent and preparation method thereof |
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| CN111410947A (en) * | 2020-03-20 | 2020-07-14 | 克拉玛依新科澳实验检测有限公司 | Composite wax-proofing agent and preparation method thereof |
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Application publication date: 20220208 |