CN114591468A - Oil-water interface activation drag reducer for cold production of thickened oil and preparation method thereof - Google Patents
Oil-water interface activation drag reducer for cold production of thickened oil and preparation method thereof Download PDFInfo
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- CN114591468A CN114591468A CN202011408949.7A CN202011408949A CN114591468A CN 114591468 A CN114591468 A CN 114591468A CN 202011408949 A CN202011408949 A CN 202011408949A CN 114591468 A CN114591468 A CN 114591468A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 67
- 230000004913 activation Effects 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229960003638 dopamine Drugs 0.000 claims abstract description 19
- GUPMCMZMDAGSPF-UHFFFAOYSA-N 1-phenylbuta-1,3-dienylbenzene Chemical group C=1C=CC=CC=1[C](C=C[CH2])C1=CC=CC=C1 GUPMCMZMDAGSPF-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229920000642 polymer Polymers 0.000 claims abstract description 15
- 238000011084 recovery Methods 0.000 claims abstract description 13
- 239000008398 formation water Substances 0.000 claims abstract description 8
- 238000012688 inverse emulsion polymerization Methods 0.000 claims abstract description 4
- 239000003921 oil Substances 0.000 claims description 102
- 230000009467 reduction Effects 0.000 claims description 45
- 238000003756 stirring Methods 0.000 claims description 33
- 239000000295 fuel oil Substances 0.000 claims description 21
- 239000000178 monomer Substances 0.000 claims description 19
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical group N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 16
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 12
- 229910021642 ultra pure water Inorganic materials 0.000 claims description 12
- 239000012498 ultrapure water Substances 0.000 claims description 12
- 239000003999 initiator Substances 0.000 claims description 11
- 239000003350 kerosene Substances 0.000 claims description 11
- 150000003839 salts Chemical class 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims 2
- 230000035484 reaction time Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 9
- 230000033558 biomineral tissue development Effects 0.000 abstract description 8
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 abstract description 3
- 230000003213 activating effect Effects 0.000 abstract description 3
- 230000015784 hyperosmotic salinity response Effects 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 26
- 230000000694 effects Effects 0.000 description 13
- 239000000839 emulsion Substances 0.000 description 12
- 239000000047 product Substances 0.000 description 10
- 239000004094 surface-active agent Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 8
- 238000005303 weighing Methods 0.000 description 8
- 239000000084 colloidal system Substances 0.000 description 7
- 239000010779 crude oil Substances 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- 230000002776 aggregation Effects 0.000 description 5
- 238000004220 aggregation Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000001603 reducing effect Effects 0.000 description 5
- 150000003983 crown ethers Chemical class 0.000 description 4
- 238000004945 emulsification Methods 0.000 description 4
- 230000001804 emulsifying effect Effects 0.000 description 4
- 239000000693 micelle Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000012295 chemical reaction liquid Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- CTENFNNZBMHDDG-UHFFFAOYSA-N Dopamine hydrochloride Chemical compound Cl.NCCC1=CC=C(O)C(O)=C1 CTENFNNZBMHDDG-UHFFFAOYSA-N 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 1
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical group C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000021615 conjugation Effects 0.000 description 1
- 150000004696 coordination complex Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 229960001149 dopamine hydrochloride Drugs 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 230000009878 intermolecular interaction Effects 0.000 description 1
- 229920000831 ionic polymer Polymers 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- VHRYZQNGTZXDNX-UHFFFAOYSA-N methacryloyl chloride Chemical compound CC(=C)C(Cl)=O VHRYZQNGTZXDNX-UHFFFAOYSA-N 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- QOHMWDJIBGVPIF-UHFFFAOYSA-N n',n'-diethylpropane-1,3-diamine Chemical compound CCN(CC)CCCN QOHMWDJIBGVPIF-UHFFFAOYSA-N 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000007764 o/w emulsion Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- -1 polyoxyethylene Polymers 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- WUUHFRRPHJEEKV-UHFFFAOYSA-N tripotassium borate Chemical compound [K+].[K+].[K+].[O-]B([O-])[O-] WUUHFRRPHJEEKV-UHFFFAOYSA-N 0.000 description 1
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F236/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F236/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
- C08F236/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
- C08F236/045—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated conjugated hydrocarbons other than butadiene or isoprene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/32—Polymerisation in water-in-oil emulsions
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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
- 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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- 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
- C09K8/60—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
- C09K8/882—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/204—Keeping clear the surface of open water from oil spills
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- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention provides an oil-water interface activation drag reducer for cold production of thickened oil and a preparation method thereof, belonging to the technical field of oilfield chemistry. The oil-water interface activation drag reducer is a 1, 1-diphenyl-1, 3-butadiene and methacrylic acid dopamine low molecular weight polymer synthesized by an inverse emulsion polymerization method. The thick oil activating agent has strong ability to activate thick oil under the non-disturbance condition, and the viscosity of the thick oil with the viscosity of less than 100000mPa & s can be reduced by more than 99.9 percent within 30min by using the activating drag reducer with the mineralization degree of 250000mg/L formation water and the concentration of 0.1wt percent under the standing condition at 50 ℃; the viscosity of the thick oil with the viscosity of 100000-500000 mPas can be reduced by more than 98.7 percent; the viscosity of the thick oil with the viscosity of 500000-plus 1500000mPa & s can be reduced by more than 97.9 percent, and the thick oil has strong temperature resistance and salt tolerance, thereby effectively solving the problem that the viscosity is difficult to reduce without disturbance under the conditions of different types of thick oil stratums and improving the cold recovery efficiency of the thick oil stratums.
Description
Technical Field
The invention belongs to the technical field of oilfield chemistry, and relates to an oil-water interface activation drag reducer for cold production of thickened oil and a preparation method thereof.
Background
The global heavy oil reserves account for about 50% of the reserves of all crude oil, and according to statistics, the reserves of the world heavy oil, super heavy oil and natural asphalt are about 1000 hundred million tons. The great nation with abundant thickened oil resources hasIn Canada, Venezuela, USA, China, Indonesia and the like, the geological reserves of heavy oil and the resources of tar sands are about 4000-. The oil companies in canada have taken first a site test for heavy oil sand production cold recovery, and then heavy oil sand production cold recovery becomes a hot spot. At present, China already establishes bases for producing thickened oil such as Liaohe, victory, Tahe, Xinjiang and Henan, etc., and the accumulated used thickened oil reserve reaches 10 multiplied by 108t, annual production capacity reaches 1300 multiplied by 104t。
The solid components in the thickened oil are mainly paraffin, asphaltene and colloid, and when the concentration of the solid components in the crude oil is relatively large, the crude oil has obvious non-Newtonian fluid characteristics. Some physical properties of the thick oil, such as rheological characteristics, are not only related to its chemical composition and chemical structure, but also closely related to the colloidal structure of the thick oil. Many researchers have shown through research that the dispersed phase in thick oils is a colloidal asphaltenic component with a supramolecular structure. The supermolecular structure of asphalt can be divided into several structural levels of unit chips, crystal-like associations, micelles, supermolecules, clusters, floccules, liquid crystals and the like. Differences in the kinetics of different aggregation processes: primary aggregation processes, such as the accumulation of asphaltene molecules into particles or micelles, involve relatively high energies and therefore may initiate very slow changes in kinetics at low temperatures; advanced aggregation processes, such as micelle formation into flocs, have almost zero activation energy and are easily formed at relatively low temperatures.
The heavy oil features high asphaltene content, high viscosity, large flow resistance and difficult exploitation. At present, the viscosity reduction methods commonly used in the thick oil exploitation process at home and abroad mainly comprise heating viscosity reduction, hydrothermal cracking viscosity reduction, microbial viscosity reduction and chemical viscosity reduction. Wherein the chemical viscosity reducer is divided into an oil-soluble viscosity reducer and a water-soluble emulsification viscosity reducer: the oil-soluble viscosity reduction enters between colloid and asphaltene flaky molecules by virtue of strong hydrogen bond forming capability and permeation and dispersion effects, and partially breaks up aggregates formed by plane overlapping and stacking to form an aggregation structure with loose structure and low order degree, so that the viscosity of the thickened oil is reduced; the main mechanisms of water-soluble emulsification and viscosity reduction comprise two aspects of emulsification and viscosity reduction and wetting resistance reduction: under the action of the surfactant, the internal friction force between oil is converted into the friction force between water and water, so that the viscosity of the thickened oil is greatly reduced; the surfactant can change the lipophilicity of the interface into hydrophilicity, form a continuous water film and reduce the flow resistance of the thickened oil.
In the period of low oil price and laboriousness in recent years, the high energy consumption of a thermal recovery mode cannot meet the requirement of a site, so that the problem that crude oil cannot flow into a shaft in a stratum is solved, and the problem is one of the key problems in realizing cold recovery of thick oil at present. In recent years, research on reducing the flow resistance of the heavy oil in the stratum during cold production is also gradually developed.
For example, the Chinese patent application CN110669489A provides a viscosity reducer used in the process of thick oil recovery, in particular to a low-power depolymerization and emulsification viscosity reducer for thick oil cold recovery and a preparation method thereof, wherein the viscosity reducer is prepared by compounding 0.1-10 wt% of polyoxyethylene grafted polyacrylamide, 40-60 wt% of crown ether surfactant and the balance of water. The polymer molecule contains long-chain alkyl which is spontaneously inserted into the stacking structure of colloid and asphaltene, the pi-pi conjugation of the colloid and the asphaltene is damaged, the aggregation force of the colloid and the asphaltene is weakened, meanwhile, the long-chain vinyl ether group of the polymer molecule protrudes out of the surface of oil drops, extends to a water phase, forms a hydrogen bond with water molecules, and can easily stretch and unfold the oil drops along with the slight disturbance of water, thereby playing the role of self-depolymerization; the small molecular crown ether belongs to a non-ionic surfactant, has low surface tension and higher wetting capacity than a corresponding open-chain compound, increases foaming capacity to a certain extent due to the activity of a crown ether ring, has complexing effect with metal ions, and can form a stable complex with sodium salt and potassium salt in mineralized water of an oil reservoir to ensure that the stable complex has certain anionic charge, so that the hydration of crown ether molecules is improved, and further the O/W emulsion is more stable. The viscosity reducer has strong capacity of depolymerizing and emulsifying the thick oil under the low-power condition, and can reduce the viscosity of the thick oil with the viscosity of 1000-5000mPa & s by more than 95 percent under the conditions that the rotating speed is lower than 50rpm, the using concentration is lower than 0.1wt percent, the temperature is 50 ℃ and the stirring time is lower than 1 min; the viscosity of the thick oil with the viscosity of 5000-10000mPa & s can be reduced by more than 98.0 percent; the viscosity of the thickened oil with the viscosity of more than 10000mPa & s can be reduced by more than 99.0 percent, and the problem that the conventional emulsifier is difficult to emulsify the thickened oil under the oil reservoir condition through seepage flow force is effectively solved. However, the viscosity reducer has a limited application range and only aims at conventional thickened oil with the viscosity of 100000 mPas or less.
Further, as disclosed in chinese patent application CN110835523A, the emulsifying viscosity reducer of the present invention is a bis-quaternary ammonium salt surfactant, which has an amphiphilic group and a bis-hydrophobic group, and has higher surface activity and lower critical micelle concentration than conventional surfactants having a single hydrophilic lipophilic group, so that the required dosage is lower; the two ends of the surfactant are provided with two phenyl groups, so that the surfactant can be easily combined with colloid asphaltene in the thick oil, and further, the whole molecule is inserted into colloid and asphaltene sheets, so that the interaction force between condensed rings in the thick oil is weakened; in addition, because the middle benzene ring has conjugated double bonds, the tendency of eliminating interfacial tension is enhanced and the stability of the formed oil-in-water emulsion is enhanced according to the similar compatibility principle. Meanwhile, the surfactant molecule has a plurality of phenyl groups and amide groups, and the groups enable the molecule to be in a large conjugated system, so that the surfactant molecule can adapt to high-temperature and high-salinity oil reservoirs. The viscosity reducer has remarkable temperature resistance and salt tolerance, the temperature resistance reaches more than 120 ℃, the calcium and magnesium ion resistance concentration reaches 130000mg/L, and the total ion resistance concentration reaches 220000 mg/L; meanwhile, the thick oil cold production emulsifying viscosity reducer disclosed by the invention is low in dosage and high in viscosity reduction rate, when the dosage is 100ppm, the viscosity of thick oil can be reduced by more than 98.0%, and the yield is high and is more than 95.0%, so that the thick oil cold production emulsifying viscosity reducer can be widely applied to thick oil cold production and transportation. But the viscosity reducer only has a good viscosity reducing effect on crude oil with the viscosity of less than 30000mPa.s, and the viscosity reducing effect is reduced after the viscosity is further increased.
At present, the oil-water interface activation drag reducer for cold production of thickened oil mainly has the following problems:
(1) the ability to activate drag reduction is limited by the viscosity of the crude oil. Most of oil-water interface activation drag reducers for cold production of thickened oil have limited application range and are only effective for conventional thickened oil with lower viscosity;
(2) the activation drag reduction effect on high-temperature or high-salinity oil reservoirs is poor. Most activated drag reducers are difficult to adapt to high temperature or highly mineralized reservoir environments;
(3) the preparation process is complex, the yield is low, and toxic intermediate products are possibly generated in the preparation process to pollute the environment.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an oil-water interface activation drag reducer for cold production of thickened oil and a preparation method thereof. The invention aims to effectively solve the problem that viscosity is difficult to reduce without disturbance under different types of thick oil stratum conditions and improve the cold production efficiency of thick oil in the stratum.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides an oil-water interface activation drag reducer for cold production of thickened oil, which is a low molecular weight polymer obtained by inverse emulsion polymerization of a salt-resistant amphiphilic monomer and a lipophilic monomer.
Further, the salt-resistant amphiphilic monomer of the oil-water interface activation drag reducer for heavy oil cold recovery is selected from dopamine methacrylate.
Further, the oleophylic monomer of the oil-water interface activation drag reducer for the heavy oil cold recovery is selected from 1, 1-diphenyl-1, 3-butadiene.
Further, the oil-water interface activation drag reducer for cold production of thickened oil has the following structure:
wherein the molecular weight of the polymer is 10000-30000.
The invention provides a preparation method of an oil-water interface activation drag reducer for cold production of thickened oil, which comprises the following steps:
(1) dissolving lipophilic monomer in kerosene, and stirring;
(2) dissolving an anti-salt amphiphilic monomer in ultrapure water, and then adding the solution in the step (1);
(3) adding an initiator, and introducing inert gas to remove oxygen;
(4) and reacting to obtain the oil-water interface activation drag reducer for cold production of thickened oil.
Further, the step (1) is specifically as follows: 1, 1-diphenyl-1, 3-butadiene is dissolved in kerosene and stirred uniformly.
Further, the step (2) is specifically as follows: dissolving dopamine methacrylate in ultrapure water, and adding the dissolved dopamine methacrylate into the solution in the step (1) under the stirring conditions of normal pressure and the stirring speed of 100-300 rpm; controlling the molar ratio of the dopamine methacrylate to the 1, 1-diphenyl-1, 3-butadiene to be 1: 1.05-1.08.
Further, the step (3) is specifically: adding an initiator azobisisobutyronitrile with the dosage of 0.08-0.3 wt% of the total amount of the raw materials, and introducing N2And (4) deoxidizing for 30 min.
Further, the step (4) is specifically as follows: heating and reacting for 15-20h at 60-80 ℃, and obtaining the oil-water interface activated drag reducer, wherein the product is viscous light yellow transparent emulsion.
The invention provides application of the oil-water interface activation drag reducer for cold production of thickened oil in activation drag reduction production of a high-temperature high-salinity oil reservoir thickened oil stratum.
Furthermore, the oil-water interface activation drag reducer for cold recovery of heavy oil is applied to activation drag reduction recovery of a heavy oil stratum of a high-temperature high-salinity reservoir, and is prepared into an aqueous solution with a certain mass fraction by using simulated stratum water, and then the aqueous solution is injected into the heavy oil reservoir to perform interface activation drag reduction on the heavy oil.
The polymer molecule of the invention is a 1, 1-diphenyl-1, 3-butadiene and dopamine methacrylate low molecular weight polymer synthesized by an inverse emulsion polymerization method. On a macromolecular chain taking polyacrylamide as a framework, by introducing an amphiphilic functional monomer similar to Gemini type or polyion (having multiple charge property), the intermolecular interaction can be greatly increased, the improvement of the solubility of the polymer is facilitated, the hydrophilic and oleophilic properties of the polymer can be improved, and in addition, the ortho-position dihydroxyl can form a chelate coordination complex with high-valence metal ions, so that the bearing capacity of the polymer on calcium and magnesium ions can be improved; through polymerization with 1, 1-diphenyl-1, 3-butadiene, the aromatic ring content in the polymer is improved, the molecular weight is reduced as far as possible on the premise of ensuring the viscosity reduction effect, the compatibility with asphaltene is improved, and meanwhile, the temperature resistance of the polymer is improved through a conjugated system formed by a multi-benzene ring structure. Therefore, the invention is a drag reduction system with certain activation capacity on an oil-water interface, and can meet the requirement of the low-disturbance quasi-static drag reduction viscosity reducer for the high-temperature high-salinity fracture-cavity type oil reservoir super heavy oil.
Compared with the prior art, the invention has the following beneficial effects:
(1) the thick oil activating capacity is strong under the non-disturbance condition. The viscosity reduction effect of the oil-water interface activated drag reducer is greatly improved by controlling the molar ratio of the salt-resistant amphiphilic monomer to the lipophilic monomer to be 1: 1.05-1.08. Under the standing condition of 50 ℃, the viscosity of the thick oil with the viscosity of less than 100000mPa & s can be reduced by more than 99.9 percent within 30min by using the activated drag reducer with the mineralization degree of 250000mg/L of formation water and the concentration of 0.1wt percent; the viscosity of the thick oil with the viscosity of 100000-500000 mPas can be reduced by more than 98.7 percent; the viscosity of the thickened oil with the viscosity of 500000-1500000mPa & s can be reduced by more than 97.9 percent, and the problem that the viscosity is difficult to reduce under the standing condition of different types of thickened oil is effectively solved;
(2) the universality for oil reservoirs under different conditions is strong. The temperature resistance and salt tolerance are good, the highest temperature resistance reaches 150 ℃, and the highest mineralization resistance reaches 250000 mg/L;
(3) the preparation process is simple and has strong operability. The preparation process is clean, pollution-free, safe and environment-friendly, and the product has high yield and is easy to obtain.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to specific embodiments below. However, the following examples are only preferred embodiments of the present invention, and not all of them. In the interest of clarity, not all features of an actual implementation are described. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention.
The sources of the raw materials used in the present invention are not limited, and the raw materials used in the present invention are all those commonly available in the art unless otherwise specified. Wherein, the 1, 1-diphenyl-1, 3-butadiene is purchased from Guanao bioscience and technology Limited in Hubei, and the product number is 4165-81-5; the preparation method of the self-prepared dopamine methacrylate comprises the following specific steps: (1) dissolving 51-63 parts by weight of dopamine hydrochloride in 50-90 parts by weight of solvent, adding 28-35 parts by weight of methacryloyl chloride, and uniformly stirring to obtain a mixture; (2) adding 3-6 parts by weight of organic boron catalyst and 10-18 parts by weight of catalytic regulator into the mixture obtained in the step (1), uniformly mixing, and reacting at the temperature of 10-30 ℃ for 20-25h to obtain reaction liquid; (3) and (3) carrying out reduced pressure distillation and oil pump drying by using a rotary evaporator, and removing the solvent and the catalyst in the reaction liquid obtained in the step (2) to obtain the offwhite dopamine methacrylate amphiphilic monomer. Wherein, the solvent in the step (1) is at least one of methanol and ethanol; in the step (2), the organic boron catalyst is at least one of sodium borate and potassium borate; in the step (2), the catalytic regulator is at least one of N, N-diethyl ethylamine and diethyl aminopropyl ammonia.
Example 1
(1) Dissolving 50g (0.24mol) of 1, 1-diphenyl-1, 3-butadiene in 50g (0.25mol) of kerosene, and uniformly stirring;
(2) dissolving 50g (0.23mol) of dopamine methacrylate in 50g (2.78mol) of ultrapure water, and adding the solution into the solution in the step (1) under the conditions of normal pressure and stirring speed of 100 rpm;
(3) adding an initiator azobisisobutyronitrile according to 0.1 wt% of the total weight of the raw materials, and introducing N2Deoxidizing for 30 min;
(4) heating and reacting for 15h at 60 ℃, and obtaining the oil-water interface activated drag reducer B, wherein the product is viscous light yellow transparent emulsion1The molecular weight was determined to be 12800.
An oil-water interface activated drag reducer solution with the concentration of 0.1 wt% is prepared by using formation water with the mineralization degree of 250000mg/L, then the thickened oil is kept in a constant temperature water bath at the temperature of 50 ℃ for 2 hours, free water and bubbles in the thickened oil are removed by stirring, and the viscosity of the thickened oil is 198600mPa & s by quickly measuring the rotational viscosity. Weighing 120g of prepared thick oil sample into a beaker, adding 120g of oil-water interface activation drag reducer solution with the concentration of 0.1 wt%, putting the mixture into a thermostatic water bath at 50 ℃, standing and keeping the temperature for 1h, placing a stirring paddle at the center of the beaker and 2-3mm away from the bottom, adjusting the rotating speed to 250r/min, rapidly measuring the viscosity of the thick oil emulsion to 1201mPa & s by using a rotational viscometer, and calculating the viscosity reduction rate to be 99.4%.
Example 2
(1) Dissolving 50g (0.24mol) of 1, 1-diphenyl-1, 3-butadiene in 50g (0.25mol) of kerosene, and uniformly stirring;
(2) dissolving 50g (0.23mol) of dopamine methacrylate in 50g (2.78mol) of ultrapure water, and adding the solution into the solution in the step (1) under the conditions of normal pressure and stirring speed of 200 rpm;
(3) adding an initiator azobisisobutyronitrile according to 0.15 wt% of the total weight of the raw materials, and introducing N2Deoxidizing for 30 min;
(4) heating and reacting for 20h at 70 ℃, and obtaining the oil-water interface activated drag reducer B, wherein the product is viscous light yellow transparent emulsion2The molecular weight was determined to be 19200.
An oil-water interface activation drag reducer solution with the concentration of 0.1 wt% is prepared by using formation water with the mineralization degree of 250000mg/L, then the thick oil is kept at the constant temperature for 2 hours in a constant-temperature water bath with the temperature of 50 ℃, free water and air bubbles in the thick oil are removed by stirring, and the viscosity of the thick oil is 198600mPa & s by rapidly measuring the rotational viscosity. Weighing 120g of prepared thick oil sample into a beaker, adding 120g of oil-water interface activation drag reducer solution with the concentration of 0.1 wt%, putting the mixture into a thermostatic water bath at 50 ℃, standing and keeping the temperature for 1h, placing a stirring paddle at the center of the beaker and 2-3mm away from the bottom, adjusting the rotating speed to 250r/min, rapidly measuring the viscosity of the thick oil emulsion to 805mPa & s by using a rotational viscometer, and calculating the viscosity reduction rate to be 99.6%.
Example 3
(1) Dissolving 50g (0.24mol) of 1, 1-diphenyl-1, 3-butadiene in 50g (0.25mol) of kerosene, and uniformly stirring;
(2) dissolving 50g (0.23mol) of dopamine methacrylate in 50g (2.78mol) of ultrapure water, and adding the solution into the solution in the step (1) under the conditions of normal pressure and stirring speed of 250 rpm;
(3) adding an initiator azobisisobutyronitrile according to 0.2 wt% of the total weight of the raw materials, and introducing N2Deoxidizing for 30 min;
(4)7heating and reacting for 16h at 5 ℃, and obtaining the oil-water interface activated drag reducer B, wherein the product is viscous light yellow transparent emulsion3The molecular weight was determined to be 22400.
An oil-water interface activation drag reducer solution with the concentration of 0.1 wt% is prepared by using formation water with the mineralization degree of 250000mg/L, then the thick oil is kept at the constant temperature for 2 hours in a constant-temperature water bath with the temperature of 50 ℃, free water and air bubbles in the thick oil are removed by stirring, and the viscosity of the thick oil is 198600mPa & s by rapidly measuring the rotational viscosity. Weighing 120g of prepared thick oil sample into a beaker, adding 120g of oil-water interface activation drag reducer solution with the concentration of 0.1 wt%, putting the mixture into a thermostatic water bath at 50 ℃, standing and keeping the temperature for 1h, placing a stirring paddle at the center of the beaker and 2-3mm away from the bottom, adjusting the rotating speed to 250r/min, rapidly measuring the viscosity of the thick oil emulsion to 210mPa & s by using a rotational viscometer, and calculating the viscosity reduction rate to be 99.9%.
Example 4
(1) Dissolving 50g (0.24mol) of 1, 1-diphenyl-1, 3-butadiene in 50g (0.25mol) of kerosene, and uniformly stirring;
(2) dissolving 50g (0.23mol) of dopamine methacrylate in 50g (2.78mol) of ultrapure water, and adding the solution into the solution in the step (1) under the conditions of normal pressure and stirring speed of 300 rpm;
(3) adding an initiator azobisisobutyronitrile according to 0.25 wt% of the total weight of the raw materials, and introducing N2Deoxidizing for 30 min;
(4) heating and reacting for 18h at the temperature of 80 ℃, and obtaining the oil-water interface activated drag reducer B, wherein the product is viscous light yellow transparent emulsion4The molecular weight was determined to be 25600.
An oil-water interface activation drag reducer solution with the concentration of 0.1 wt% is prepared by using formation water with the mineralization degree of 250000mg/L, then the thick oil is kept at the constant temperature for 2 hours in a constant-temperature water bath with the temperature of 50 ℃, free water and air bubbles in the thick oil are removed by stirring, and the viscosity of the thick oil is 198600mPa & s by rapidly measuring the rotational viscosity. Weighing 120g of prepared thick oil sample into a beaker, adding 120g of oil-water interface activation drag reducer solution with the concentration of 0.1 wt%, putting the mixture into a thermostatic water bath at 50 ℃, standing and keeping the temperature for 1h, placing a stirring paddle at the center of the beaker and 2-3mm away from the bottom, adjusting the rotating speed to 250r/min, rapidly measuring the viscosity of the thick oil emulsion to 1604mPa & s by using a rotational viscometer, and calculating the viscosity reduction rate to be 99.2%.
Example 5
The viscosity reduction effect of different addition amounts on the thickened oil is explored: the concentrations of the oil-water interface activation drag reducer added were 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, respectively. An oil-water interface activated drag reducer solution was prepared as in example 3.
The thick oil was kept at a constant temperature in a constant-temperature water bath of 50 ℃ for 2 hours, free water and air bubbles were removed by stirring, and the viscosity was 198600 mPas as measured by rotational viscosity immediately. Weighing 120g of prepared thickened oil sample into a beaker, adding 120g of oil-water interface activation drag reducer solution with the concentration of 0.1-0.5%, placing the mixture into a constant-temperature water bath at 50 ℃, standing and keeping the temperature for 1h, placing a stirring paddle in the center of the beaker and 2-3mm away from the bottom, adjusting the rotating speed to 250r/min, rapidly measuring the viscosity of the thickened oil emulsion by using a rotational viscometer, and calculating the viscosity reduction rate. The experiment result shows that when the viscosity reducer is added at the concentration of 0.1-0.5 wt%, the viscosity reduction effect is not very different. The results are shown in Table 1.
TABLE 1 viscosity reduction Effect of different addition amounts on thickened oils
| Oil-water interface activation drag reducer/wt% | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 |
| viscosity/mPas of thick oil after action | 210 | 226 | 152 | 143 | 140 |
| Viscosity reduction ratio/%) | 99.89 | 99.88 | 99.91 | 99.93 | 99.93 |
Example 6
The viscosity reduction and drag reduction effects on the thickened oil with different viscosities are explored: the viscosity of the selected thick oil at 50 ℃ is 96350 mPas, 198600 mPas, 480000 mPas, 725000 mPas and 1580000 mPas respectively. An oil-water interface activated drag reducer was prepared as in example 3.
Respectively weighing 20g of different thickened oil samples into test tubes, adding 20g of the prepared 0.3 wt% oil-water interface activation drag reducer solution, placing into a constant-temperature water bath at 50 ℃, standing and keeping the temperature for 1 h. Empty the test tube, keep test tube and desktop contained angle 50, empty the in-tube oil water sample, through comparing the crude oil quality in the test tube before empting, calculate static viscosity reduction rate. The experiment result shows that the viscosity reducing rate of the viscosity reducer for the thickened oil with the viscosity of 100000-1500000mPa & s is up to 97%, the viscosity reducing effect is good, and the application range is wide. The results are shown in Table 2.
TABLE 2 viscosity reduction Effect of thickened oils of different viscosities
| Serial number | viscosity/mPa.s of thick oil before viscosity reduction | Viscosity reduction ratio/%) |
| 1 | 96350 | 99.93 |
| 2 | 198600 | 99.66 |
| 3 | 480000 | 98.70 |
| 4 | 725000 | 98.66 |
| 5 | 1580000 | 97.90 |
Note: the method for calculating the static viscosity reduction rate comprises the following steps:
d-static viscosity reduction rate of the thickened oil;
m0-mass of large test tube, g;
m1-mass of thick oil in large test tube, g;
m2mass of the large tube at the end of the viscosity-reducing pour, g.
Comparative example 1
(1) Respectively mixing the raw materials in a molar ratio of 1: 1.2: 3: 15, weighing methacrylic acid dopamine, 1-diphenyl-1, 3-butadiene, kerosene and ultrapure water;
(2) dissolving 1, 1-diphenyl-1, 3-butadiene in kerosene, and uniformly stirring;
(3) dissolving dopamine methacrylate in ultrapure water, and adding the dissolved dopamine methacrylate into the solution in the step (1) under the stirring conditions of normal pressure and a stirring speed of 200 rpm;
(4) adding an initiator azobisisobutyronitrile according to 0.08 wt% of the total weight of the raw materials, and introducing N2Deoxidizing for 30 min;
(5) heating and reacting for 15h at 60 ℃, and obtaining the oil-water interface activated drag reducer DB, wherein the product is viscous light yellow transparent liquid1. The molecular weight was 7650.
Comparative example 2
(1) Respectively mixing the raw materials in a molar ratio of 1: 0.9: 1.20: 15, weighing methacrylic acid dopamine, 1-diphenyl-1, 3-butadiene, kerosene and ultrapure water;
(2) dissolving 1, 1-diphenyl-1, 3-butadiene in kerosene, and uniformly stirring;
(3) dissolving dopamine methacrylate in ultrapure water, and adding the dissolved dopamine methacrylate into the solution in the step (1) under the stirring conditions of normal pressure and a stirring speed of 200 rpm;
(4) adding an initiator azobisisobutyronitrile according to 0.3 wt% of the total weight of the raw materials, and introducing N2Deoxidizing for 30 min;
(5) heating and reacting for 20h at 75 ℃ to obtain a product which is a viscous light brown transparent liquid, thus obtaining the oil-water interface activation drag reducer DB2. The molecular weight was determined to be 36100.
DB with a concentration of 0.1 wt% was formulated using formation water with a degree of mineralization of 250000mg/L1、DB2The solution is then kept constant in a constant temperature water bath at 50 ℃ for 2h, and free water and air bubbles are removed by stirring. 120g of the prepared thick oil sample was weighed in a beaker, and 120g of 0.1 wt% DB was added1、DB2And putting the solution into a constant-temperature water bath at 50 ℃, standing for 1h, placing a stirring paddle in the center of a beaker at a position 2-3mm away from the bottom, adjusting the rotating speed to 250r/min, rapidly measuring the viscosity of the thick oil emulsion by using a rotational viscometer, and calculating the viscosity reduction rate. When the products obtained in comparative examples 1 to 2 were compared with examples 1 to 4, it was found that the molecular weight of the polymer was 1The viscosity reduction rate of the viscosity reducer reaches 99% when 0000-30000 is adopted, and the viscosity reduction effect is the best. The results are shown in Table 3.
TABLE 3 viscosity reduction Effect of viscosity reducers of different molecular weights
| Sample number | Molecular weight | viscosity/mPa.s of thick oil before viscosity reduction | viscosity/mPa.s of thickened oil after viscosity reduction | Viscosity reduction ratio/%) |
| DB1 | 7650 | 198600 | 32150 | 83.81 |
| B1 | 12800 | 198600 | 1201 | 99.4 |
| B2 | 19200 | 198600 | 805 | 99.6 |
| B3 | 22400 | 198600 | 210 | 99.9 |
| B4 | 25600 | 198600 | 1604 | 99.2 |
| DB2 | 36100 | 198600 | 21366 | 89.24 |
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omission, equivalent replacement, or improvement made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims (10)
1. An oil-water interface activation drag reducer for cold production of thickened oil is characterized in that: is a low molecular weight polymer obtained by inverse emulsion polymerization of salt-resistant amphiphilic monomer and lipophilic monomer.
2. The oil-water interface activation drag reducer for cold production of heavy oil according to claim 1, characterized in that: the salt-resistant amphiphilic monomer is selected from dopamine methacrylate.
3. The oil-water interface activation drag reducer for cold production of heavy oil according to claim 1, characterized in that: the oleophilic monomer is selected from 1, 1-diphenyl-1, 3-butadiene.
4. The oil-water interface activated drag reducer for cold recovery of heavy oil of claim 1, having the structure:
wherein the molecular weight of the polymer is 10000-30000.
5. The preparation method of the oil-water interface activated drag reducer for cold production of heavy oil according to any one of claims 1 to 4, characterized by comprising the steps of:
(1) dissolving lipophilic monomer in kerosene, and stirring;
(2) dissolving an anti-salt amphiphilic monomer in ultrapure water, and then adding the solution in the step (1);
(3) adding an initiator, and introducing inert gas to remove oxygen;
(4) the oil-water interface activation drag reducer for the cold recovery of the thickened oil is obtained after the reaction.
6. The production method according to claim 5, wherein in the step (2): adding the salt-resistant amphiphilic monomer dissolved in ultrapure water into the solution in the step (1) under the conditions of normal pressure and stirring speed of 100-300 rpm; the molar ratio of the salt-resistant amphiphilic monomer to the lipophilic monomer is controlled to be 1: 1.05-1.08.
7. The production method according to claim 5, wherein in the step (3): the initiator is azobisisobutyronitrile; the amount of the initiator is 0.08-0.3 wt% of the total amount of the raw materials.
8. The production method according to claim 5, wherein in the step (4): the reaction temperature is 60-80 ℃, and the reaction time is 15-20 h.
9. Use of the oil-water interface activated drag reducer for cold production of heavy oil according to any one of claims 1 to 4 in activated drag reduction production of high temperature high salinity reservoir heavy oil formation.
10. The use of claim 9, wherein: the oil-water interface activation drag reducer for cold production of thickened oil is prepared into a water solution with a certain mass fraction by using simulated formation water, and then the water solution is injected into a thickened oil reservoir to perform interface activation drag reduction on the thickened oil.
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