CN114591468B - Oil-water interface activation drag reducer for thickened oil cold recovery and preparation method - Google Patents
Oil-water interface activation drag reducer for thickened oil cold recovery and preparation method Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 77
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 63
- 230000004913 activation Effects 0.000 title claims abstract description 38
- 238000011084 recovery Methods 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title abstract description 12
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 claims abstract description 32
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- 229960003638 dopamine Drugs 0.000 claims abstract description 16
- 229920000642 polymer Polymers 0.000 claims abstract description 16
- GUPMCMZMDAGSPF-UHFFFAOYSA-N 1-phenylbuta-1,3-dienylbenzene Chemical compound C=1C=CC=CC=1[C](C=C[CH2])C1=CC=CC=C1 GUPMCMZMDAGSPF-UHFFFAOYSA-N 0.000 claims abstract description 14
- 150000003839 salts Chemical class 0.000 claims abstract description 13
- 238000012688 inverse emulsion polymerization Methods 0.000 claims abstract description 4
- 239000003921 oil Substances 0.000 claims description 106
- 230000009467 reduction Effects 0.000 claims description 44
- 238000003756 stirring Methods 0.000 claims description 33
- 239000000243 solution Substances 0.000 claims description 32
- 239000000295 fuel oil Substances 0.000 claims description 21
- 239000000178 monomer Substances 0.000 claims description 19
- 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
- 239000002994 raw material Substances 0.000 claims description 10
- 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 8
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- 230000003213 activating effect Effects 0.000 abstract 1
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- 230000000052 comparative effect Effects 0.000 description 3
- 238000004945 emulsification Methods 0.000 description 3
- 239000000693 micelle Substances 0.000 description 3
- 239000000203 mixture Substances 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
- 238000005303 weighing Methods 0.000 description 3
- 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
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- 239000001257 hydrogen Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
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- 239000004576 sand Substances 0.000 description 2
- 239000007787 solid Substances 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
- 150000003863 ammonium salts 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
- 238000006664 bond formation reaction Methods 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 239000012295 chemical reaction liquid 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
- 230000001276 controlling effect Effects 0.000 description 1
- 150000004696 coordination complex Chemical class 0.000 description 1
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- 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
- 239000012530 fluid Substances 0.000 description 1
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- 238000006703 hydration reaction Methods 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 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
- 244000005700 microbiome Species 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 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
- 159000000001 potassium salts Chemical class 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 239000011275 tar sand Substances 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
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- 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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- 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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- 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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- 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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Abstract
The invention provides an oil-water interface activation drag reducer for thickened oil cold recovery and a preparation method thereof, belonging to the technical field of oilfield chemistry. The oil-water interface activation drag reducer is a low molecular weight polymer of 1, 1-diphenyl-1, 3-butadiene and dopamine methacrylate synthesized by an inverse emulsion polymerization method. The ability of activating the thick oil under the non-disturbance condition is strong, the viscosity of the thick oil with the viscosity of less than 100000 mPa.s can be reduced by more than 99.9 percent within 30 minutes when the activated drag reducer with the mineralization degree of 250000mg/L is prepared by using stratum water and the concentration of 0.1 weight percent under the static condition of 50 ℃; the viscosity of the thick oil with the viscosity of 100000-500000 mPa.s can be reduced by more than 98.7 percent; the viscosity of the thickened oil with the viscosity of 500000-1500000 mPa.s can be reduced by more than 97.9%, the temperature resistance and the salt resistance are strong, the problem that the viscosity is difficult to reduce due to no disturbance under different types of thickened oil stratum conditions is effectively solved, and the cold recovery efficiency of the stratum thickened oil is improved.
Description
Technical Field
The invention belongs to the technical field of oilfield chemistry, and relates to an oil-water interface activation drag reducer for thickened oil cold recovery and a preparation method thereof.
Background
The global heavy oil reserves account for about 50% of the total crude oil reserves, and the world heavy oil, super heavy oil and natural asphalt reserves are statistically about 1000 hundred million tons. The large countries with rich heavy oil resources include Canada, venezuela, america, china, indonesia and the like, and the heavy oil geological reserves and the tar sand resources of the large countries are about 4000-6000 hundred million tons, and the annual yield of the heavy oil is up to 1.27 hundred million tons, wherein most of the heavy oil is extracted by a thermal recovery method. The Canadian oil company first developed field tests for heavy oil sand-producing cold recovery, and then heavy oil sand-producing cold recovery became a hot spot. At present, the thickened oil production bases such as Liaohe, victory, tahe, xinjiang and Henan are established in China, and the accumulated and used thickened oil reserves reach 10 multiplied by 10 8 t, annual capacity up to 1300 x 10 4 t。
The solid components in the thick oil are mainly paraffin, asphaltene and colloid, and when the concentration of the solid substances in the crude oil is relatively large, the crude oil has obvious characteristics of non-Newtonian fluid. Certain physical properties of the thick oil, such as rheological properties, are not only related to its chemical composition and chemical structure, but are also closely related to the colloidal structure of the thick oil. Many scholars have shown through research that the dispersed phase in the thick oil is a gelatinous, asphaltic component with a supramolecular structure. The asphalt supermolecular structure can be divided into a plurality of structural layers such as a cell, a quasi-crystalline association body, a micelle, a supermicelle, a cluster, a floccule, a liquid crystal and the like. The kinetics of the different aggregation processes differ: the energy involved in the primary aggregation process, such as the accumulation of asphaltene molecules to form particles or micelles, is relatively high, so that the kinetics may change very slowly at low temperatures; advanced aggregation processes, such as micelle-forming floccules, have almost zero activation energy and are readily formed at lower temperatures.
The thick oil has the characteristics of high asphaltene content, high viscosity, high flow resistance and difficult exploitation. The current common viscosity reduction methods used in the thick oil exploitation process at home and abroad mainly comprise heating viscosity reduction, hydrothermal cracking viscosity reduction, microorganism viscosity reduction and chemical viscosity reduction. Wherein the chemical viscosity reducer is divided into an oil-soluble viscosity reducer and a water-soluble emulsifying viscosity reducer: the oil-soluble viscosity reduction enters between colloid and asphaltene lamellar molecules by means of stronger hydrogen bond formation capability and permeation and dispersion effects, and the aggregate formed by overlapping and piling up partial disassembly planes forms an aggregation structure with loose structure and lower order degree, so that the viscosity of thick oil is reduced; the main mechanisms of water-soluble emulsification viscosity reduction include two aspects of emulsification viscosity reduction and wetting viscosity reduction: under the action of a surfactant, the internal friction force between the oil is converted into the friction force between water and the water, so that the viscosity of the thick oil is greatly reduced; the surfactant can reversely transform the interface lipophilicity into hydrophilicity to form a continuous water film, so that the flow resistance of thickened oil is reduced.
In recent years, in the period of low oil price, the high energy consumption of the thermal recovery mode cannot meet the field requirement, 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 the current realization of cold recovery of thick oil. In recent years, research on reducing the flow resistance of thick oil in stratum during cold production is also gradually developed.
For example, the Chinese patent application CN110669489A provides a viscosity reducer used in the thick oil exploitation process, in particular relates to a low-power depolymerization emulsification viscosity reducer for thick oil cold exploitation and a preparation method thereof, and the viscosity reducer is formed by compounding 0.1-10wt% of polyethylene oxide grafted polyacrylamide, 40-60wt% of crown ether surfactant and the balance of water. The polymer molecule contains long-chain alkyl which is spontaneously inserted into a stacking structure of colloid and asphaltene to break pi-pi conjugation of the colloid asphaltene, weaken aggregation force of the colloid and asphaltene, and simultaneously the long-chain vinyl ether group of the polymer molecule protrudes out of the surface of oil drops, stretches to a water phase to form hydrogen bonds with water molecules, and can be easily stretched and unfolded along with light disturbance of the water to play a role in self-depolymerization; the small molecular crown ether belongs to a nonionic surfactant, has low surface tension, has higher wetting capability than the corresponding open-chain compound, has a certain increase in foaming capability due to the activity of crown ether rings, and simultaneously has the effect of complexing with metal ions, and can form stable complexes with sodium salts and potassium salts in reservoir mineralized water to enable the stable complexes to have certain anionic charges, so that the hydration of crown ether molecules is improved, and the O/W emulsion is further more stable. The viscosity reducer has strong capability of depolymerizing emulsified thick oil under the condition of low power, and can reduce the viscosity of thick oil with the viscosity of 1000-5000 mPa.s by more than 95% under the conditions that the rotating speed is lower than 50rpm, the use concentration is lower than 0.1wt%, the temperature is 50 ℃ and the stirring time is lower than 1 min; the viscosity of the thick oil with the viscosity of 5000-10000 mPa.s can be reduced by more than 98.0 percent; the viscosity of the thick oil with the viscosity of more than 10000 mPa.s can be reduced by more than 99.0%, and the problem that the thick oil is difficult to be emulsified by seepage force of a conventional emulsifier under the oil reservoir condition is effectively solved. However, the viscosity reducer has a limited application range, and is only used for conventional thick oil with viscosity within 100000 mPa.s.
As further disclosed in chinese patent application CN110835523a, the emulsifying viscosity reducer of the present invention is a biquaternary ammonium salt surfactant, which has a double hydrophilic group and a double hydrophobic group, and is higher than conventional surfactants with a single hydrophilic and lipophilic group, and has a lower critical micelle concentration, so that the required usage amount is lower; two ends of the surfactant are two phenyl groups, so that the surfactant is easier to combine with colloid asphaltene in the thick oil, and then the whole molecule is penetrated into colloid and asphaltene sheets, so that the interaction force between condensed rings in the thick oil is weakened; in addition, since the intermediate benzene ring has conjugated double bonds, the tendency of eliminating interfacial tension is enhanced according to the similar compatibility principle, and the stability of the formed oil-in-water emulsion is enhanced. 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 be suitable for high-temperature and high-salt oil reservoirs. The viscosity reducer has remarkable temperature resistance and salt resistance, the temperature resistance reaches more than 120 ℃, the calcium and magnesium ion concentration reaches 130000mg/L, and the total ion concentration reaches 220000mg/L; meanwhile, the thick oil cold-production emulsifying viscosity reducer has low dosage and high viscosity reduction rate, and when the dosage is 100ppm, the viscosity of the thick oil can be reduced by more than 98.0 percent, and the yield is high and is more than 95.0 percent, so that the thick oil cold-production emulsifying viscosity reducer can be widely applied to thick oil cold-production and transportation. However, the viscosity reducer has a good viscosity reducing effect only on crude oil with viscosity 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 thickened oil cold recovery mainly has the following problems:
(1) The ability to activate drag reduction is limited by the viscosity of the crude oil. Most of the oil-water interface activation drag reducers for cold recovery of the thickened oil have limited application range and are only effective on conventional thickened oil with lower viscosity;
(2) The activation drag reduction effect on high temperature or hypersalinity oil reservoirs is poor. Most activated drag reducers are difficult to accommodate in high temperature or hypersalinity reservoir environments;
(3) The preparation process is complex, the yield is low, and toxic intermediate products can be generated in the preparation process so as to pollute the environment.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides an oil-water interface activation drag reducer for thickened oil cold recovery and a preparation method thereof. The invention aims to effectively solve the problem that viscosity is difficult to reduce without disturbance under different thick oil stratum conditions, and improve the cold recovery efficiency of the thick oil stratum.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the invention provides an oil-water interface activation drag reducer for thickened oil cold recovery, which is a low molecular weight polymer obtained by adopting inverse emulsion polymerization of salt-resistant amphiphilic monomers and lipophilic monomers.
Further, the anti-salt amphiphilic monomer of the oil-water interface activation drag reducer for cold recovery of the thick oil is selected from dopamine methacrylate.
Further, the lipophilic monomer of the oil-water interface activation drag reducer for thickened oil cold recovery is selected from 1, 1-diphenyl-1, 3-butadiene.
Further, the oil-water interface activation drag reducer for cold recovery of thick 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 thickened oil cold recovery, which comprises the following steps:
(1) Dissolving lipophilic monomer in kerosene, and stirring uniformly;
(2) Dissolving the salt-resistant amphiphilic monomer in ultrapure water, and then adding the salt-resistant amphiphilic monomer into the solution in the step (1);
(3) Adding an initiator, and introducing inert gas to deoxidize;
(4) And reacting to obtain the oil-water interface activation drag reducer for thickened oil cold recovery.
Further, the step (1) specifically comprises: 1, 1-diphenyl-1, 3-butadiene is dissolved in kerosene and stirred evenly.
Further, the step (2) specifically comprises: dissolving dopamine methacrylate into ultrapure water, and adding the solution into the solution in the step (1) under the stirring conditions of normal pressure and stirring speed of 100-300 rpm; the molar ratio of the dopamine methacrylate to the 1, 1-diphenyl-1, 3-butadiene is controlled to be 1:1.05-1.08.
Further, the step (3) specifically comprises: adding initiator azodiisobutyronitrile accounting for 0.08-0.3wt% of the total amount of the raw materials, and introducing N 2 Deoxidizing for 30min.
Further, the step (4) specifically comprises: heating at 60-80 deg.c for 15-20 hr to obtain viscous light yellow transparent emulsion as the product.
The invention provides an application of the oil-water interface activation drag reducer for cold recovery of thick oil in the activation drag reduction recovery of a high-temperature high-salt oil reservoir thick oil stratum.
The oil-water interface activation drag reducer for heavy oil cold recovery is applied to heavy oil stratum activation drag reduction exploitation of high-temperature high-salt oil reservoirs, and is prepared into an aqueous solution with a certain mass fraction by using simulated formation water, and then the aqueous solution is injected into the heavy oil reservoirs to perform interface activation drag reduction on heavy oil.
The polymer molecule of the invention is a low molecular weight polymer of 1, 1-diphenyl-1, 3-butadiene and dopamine methacrylate 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 (with multiple charge properties), intermolecular interaction can be greatly increased, so that the solubility of a polymer is improved, the hydrophilic and lipophilic properties of the polymer are improved, in addition, the ortho-position dihydroxyl of the polymer can form a chelate coordination complex with high-valence metal ions, and the tolerance of the polymer to 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 much as possible on the premise of guaranteeing the viscosity reduction effect, the compatibility with asphaltene is improved, and meanwhile, the temperature resistance of the polymer is improved by a conjugated system formed by a multi-benzene ring structure. Therefore, the invention is a drag reduction system with a certain activation capability to the oil-water interface, and can meet the low-disturbance quasi-static drag reduction viscosity reducer requirement of the super-heavy oil of the high-temperature high-salt fracture-cavity type oil reservoir.
Compared with the prior art, the invention has the following beneficial effects:
(1) The ability to activate thick oil under non-disturbance condition is strong. The viscosity reduction effect of the oil-water interface activation drag reducer is greatly improved by controlling the mol ratio of the salt-resistant amphiphilic monomer to the lipophilic monomer to be 1:1.05-1.08. Under the condition of standing at 50 ℃, activated drag reducer prepared by using stratum water with the mineralization degree of 250000mg/L and the concentration of 0.1 weight percent can reduce the viscosity of thickened oil with the viscosity of less than 100000 mPas by more than 99.9 percent within 30min; the viscosity of the thick oil with the viscosity of 100000-500000 mPa.s can be reduced by more than 98.7 percent; the viscosity of the thick oil with the viscosity of 500000-1500000 mPa.s can be reduced by more than 97.9%, and the problem that the thick oil of different types is difficult to reduce viscosity under the standing condition is effectively solved;
(2) Has strong universality to oil reservoirs with different conditions. The heat resistance and the salt resistance are good, the highest heat resistance reaches 150 ℃, and the highest mineralization resistance reaches 250000mg/L;
(3) The preparation process is simple and the operability is strong. The preparation process is clean and pollution-free, safe and environment-friendly, and the product has high yield and is easy to obtain.
Detailed Description
The present invention will be further described in detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent. The following examples are merely preferred embodiments of the present invention and are not all examples. In the interest of clarity, not all features of an actual implementation are described. Based on the examples in the embodiments, those skilled in the art can obtain other examples without making any inventive effort, which fall within the scope of the invention.
The invention does not limit the sources of the adopted raw materials, and if no special description exists, the adopted raw materials are all common commercial products in the technical field. Wherein, 1-diphenyl-1, 3-butadiene is purchased from Guangdong Biotechnology Co., ltd. In Hubei, with the product number of 4165-81-5; the dopamine methacrylate is a self-made product, and the specific preparation steps are as follows: (1) Dissolving 51-63 parts by weight of dopamine hydrochloride in 50-90 parts by weight of solvent, then adding 28-35 parts by weight of methacryloyl chloride, and uniformly stirring to obtain a mixture; (2) Adding 3-6 parts by weight of an organoboron catalyst and 10-18 parts by weight of a catalytic regulator into the mixture obtained in the step (1), uniformly mixing, and reacting at the temperature of 10-30 ℃ for 20-25 hours to obtain a reaction solution; (3) And (3) performing 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 off-white dopamine methacrylate amphiphilic monomer. Wherein the solvent in the step (1) is at least one of methanol and ethanol; the organoboron catalyst in the step (2) is at least one of sodium borate and potassium borate; the catalyst regulator in the step (2) is at least one of N, N-diethyl ethylamine and diethyl aminopropyl ammonia.
Example 1
(1) 50g (0.24 mol) of 1, 1-diphenyl-1, 3-butadiene were dissolved in 50g (0.25 mol) of kerosene and stirred well;
(2) Dissolving 50g (0.23 mol) of dopamine methacrylate in 50g (2.78 mol) of ultrapure water, and adding the solution into the solution in the step (1) under stirring conditions of normal pressure and stirring speed of 100 rpm;
(3) Adding an initiator azodiisobutyronitrile according to the total weight of 0.1 percent of the raw materials, and introducing N 2 Deoxidizing for 30min;
(4) Heating at 60deg.C for reaction for 15 hr to obtain viscous light yellow transparent emulsion as the product, which is the oil-water interface activated drag reducer B 1 The molecular weight was determined to be 12800.
The method comprises the steps of preparing an oil-water interface activated drag reducer solution with the concentration of 0.1wt% by using stratum water with the mineralization degree of 250000mg/L, then keeping the constant temperature of the thick oil in a constant-temperature water bath at 50 ℃ for 2 hours, stirring to remove free water and bubbles in the thick oil, and rapidly measuring the viscosity of the thick oil to 198600 mPa.s by using a rotational viscometer. 120g of the prepared thick oil sample is weighed and placed in a beaker, 120g of an oil-water interface activation drag reducer solution with the concentration of 0.1wt% is added, the thick oil sample is placed in a constant-temperature water bath with the temperature of 50 ℃, the constant temperature is kept for 1h, a stirring paddle is placed at the center of the beaker and 2-3mm away from the bottom, the rotating speed is adjusted to 250r/min, the viscosity of the thick oil emulsion is measured to 1201 mPa.s by a rotary viscometer, and the viscosity reduction rate is calculated to be 99.4%.
Example 2
(1) 50g (0.24 mol) of 1, 1-diphenyl-1, 3-butadiene were dissolved in 50g (0.25 mol) of kerosene and stirred well;
(2) Dissolving 50g (0.23 mol) of dopamine methacrylate in 50g (2.78 mol) of ultrapure water, and adding the solution into the solution in the step (1) under stirring conditions of normal pressure and stirring speed of 200 rpm;
(3) Adding an initiator azodiisobutyronitrile according to the total weight of 0.15 percent of the raw materials, and introducing N 2 Deoxidizing for 30min;
(4) Heating at 70deg.C for reaction for 20 hr to obtain viscous light yellow transparent emulsion as the product 2 The molecular weight was determined to be 19200.
The method comprises the steps of preparing an oil-water interface activated drag reducer solution with the concentration of 0.1wt% by using stratum water with the mineralization degree of 250000mg/L, then keeping the constant temperature of the thick oil in a constant-temperature water bath at 50 ℃ for 2 hours, stirring to remove free water and bubbles in the thick oil, and rapidly measuring the viscosity of the thick oil to 198600 mPa.s by using a rotational viscometer. 120g of the prepared thick oil sample is weighed and placed in a beaker, 120g of an oil-water interface activation drag reducer solution with the concentration of 0.1wt% is added, the thick oil sample is placed in a constant-temperature water bath with the temperature of 50 ℃, the constant temperature is kept for 1h, a stirring paddle is placed at the center of the beaker and 2-3mm away from the bottom, the rotating speed is adjusted to 250r/min, the viscosity of the thick oil emulsion is measured to 805 mPa.s by a rotary viscometer, and the viscosity reduction rate is calculated to be 99.6%.
Example 3
(1) 50g (0.24 mol) of 1, 1-diphenyl-1, 3-butadiene were dissolved in 50g (0.25 mol) of kerosene and stirred well;
(2) Dissolving 50g (0.23 mol) of dopamine methacrylate in 50g (2.78 mol) of ultrapure water, and adding the solution into the solution in the step (1) under the stirring condition of normal pressure and stirring speed of 250 rpm;
(3) Adding an initiator azodiisobutyronitrile according to the total weight of 0.2 percent of the raw materials, and introducing N 2 Deoxidizing for 30min;
(4) Heating at 75deg.C for reaction for 16 hr to obtain viscous light yellow transparent emulsion as the product, which is the oil-water interface activated drag reducer B 3 The molecular weight was determined to be 22400.
The method comprises the steps of preparing an oil-water interface activated drag reducer solution with the concentration of 0.1wt% by using stratum water with the mineralization degree of 250000mg/L, then keeping the constant temperature of the thick oil in a constant-temperature water bath at 50 ℃ for 2 hours, stirring to remove free water and bubbles in the thick oil, and rapidly measuring the viscosity of the thick oil to 198600 mPa.s by using a rotational viscometer. 120g of the prepared thick oil sample is weighed and placed in a beaker, 120g of an oil-water interface activation drag reducer solution with the concentration of 0.1wt% is added, the thick oil sample is placed in a constant-temperature water bath with the temperature of 50 ℃, the constant temperature is kept for 1h, a stirring paddle is placed at the center of the beaker and 2-3mm away from the bottom, the rotating speed is adjusted to 250r/min, the viscosity of the thick oil emulsion is measured to be 210 mPa.s by a rotary viscometer, and the viscosity reduction rate is calculated to be 99.9%.
Example 4
(1) 50g (0.24 mol) of 1, 1-diphenyl-1, 3-butadiene were dissolved in 50g (0.25 mol) of kerosene and stirred well;
(2) Dissolving 50g (0.23 mol) of dopamine methacrylate in 50g (2.78 mol) of ultrapure water, and adding the solution into the solution in the step (1) under stirring conditions of normal pressure and stirring speed of 300 rpm;
(3) Adding an initiator azodiisobutyronitrile according to the total weight of 0.25 percent of the raw materials, and introducing N 2 Deoxidizing for 30min;
(4) Heating at 80deg.C for reaction for 18 hr to obtain viscous light yellow transparent emulsion as the product, which is the oil-water interface activated drag reducer B 4 The molecular weight was determined to be 25600.
The method comprises the steps of preparing an oil-water interface activated drag reducer solution with the concentration of 0.1wt% by using stratum water with the mineralization degree of 250000mg/L, then keeping the constant temperature of the thick oil in a constant-temperature water bath at 50 ℃ for 2 hours, stirring to remove free water and bubbles in the thick oil, and rapidly measuring the viscosity of the thick oil to 198600 mPa.s by using a rotational viscometer. 120g of the prepared thick oil sample is weighed and placed in a beaker, 120g of an oil-water interface activation drag reducer solution with the concentration of 0.1wt% is added, the thick oil sample is placed in a constant-temperature water bath with the temperature of 50 ℃, the constant temperature is kept for 1h, a stirring paddle is placed at the center of the beaker and 2-3mm away from the bottom, the rotating speed is regulated to 250r/min, the viscosity of the thick oil emulsion is measured to 1604 mPa.s by a rotational viscometer, and the viscosity reduction rate is calculated to be 99.2%.
Example 5
The viscosity reduction effect of different addition amounts on thick oil is explored: the concentration of the added oil-water interface activation drag reducer is 0.1wt%,0.2wt%,0.3wt%,0.4wt% and 0.5wt% respectively. An oil-water interface activated drag reducer solution was prepared as in example 3.
The thick oil was kept at a constant temperature for 2 hours in a constant temperature water bath at 50℃and free water and bubbles were removed by stirring, and the viscosity thereof was measured rapidly with a rotational viscometer as 198600 mPa.s. 120g of the prepared thick oil sample is weighed and placed in a beaker, 120g of an oil-water interface activation drag reducer solution with the concentration of 0.1-0.5% is added, the thick oil sample is placed in a constant-temperature water bath with the temperature of 50 ℃, the constant temperature is kept for 1h, a stirring paddle is placed at the center of the beaker and 2-3mm away from the bottom, the rotating speed is adjusted to 250r/min, the viscosity of the thick oil emulsion is rapidly measured by a rotational viscometer, and the viscosity reduction rate is calculated. Experimental results show that when the concentration of the viscosity reducer is 0.1-0.5 wt%, the viscosity reducing effect is not very different. The results are shown in Table 1.
TABLE 1 viscosity reduction effect on heavy oil with different addition amounts
| Oil-water interface activated drag reducer/wt% | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 |
| Viscosity of thick oil after action/mPa.s | 210 | 226 | 152 | 143 | 140 |
| Viscosity reduction rate/% | 99.89 | 99.88 | 99.91 | 99.93 | 99.93 |
Example 6
The viscosity reduction and drag reduction effects on thick oil with different viscosities are explored: the selected thick oils have a viscosity of 96350 mPas, 198600 mPas, 480000 mPas, 725000 mPas and 1580000 mPas, respectively, at 50 ℃. An oil-water interface activated drag reducer was prepared as in example 3.
Respectively weighing 20g of different thickened oil samples into a test tube, adding 20g of prepared 0.3wt% oil-water interface activation drag reducer solution, placing into a constant-temperature water bath at 50 ℃, standing and keeping the temperature for 1h. Pouring the test tube, keeping the included angle between the test tube and the tabletop at 50 degrees, pouring the oil water sample in the test tube, and calculating the static viscosity reduction rate by comparing the crude oil quality in the test tube before and after pouring. Experimental results show that the viscosity reducer has a viscosity reducing rate of 97% for thick oil with viscosity of 100000-1500000 mPa.s, good viscosity reducing effect and wide application range. The results are shown in Table 2.
TABLE 2 viscosity reduction effects of heavy oils of different viscosities
| Sequence number | Viscosity of thick oil before viscosity reduction/mPa.s | Viscosity reduction rate/% |
| 1 | 96350 | 99.93 |
| 2 | 198600 | 99.66 |
| 3 | 480000 | 98.70 |
| 4 | 725000 | 98.66 |
| 5 | 1580000 | 97.90 |
Note that: the calculation method of the static viscosity reduction rate comprises the following steps:
d, static viscosity reduction rate of the thickened oil;
m 0 mass of large test tube g;
m 1 -mass of thickened oil in large test tubes, g;
m 2 mass of large tube after viscosity reduction and pouring, g.
Comparative example 1
(1) The molar ratio is 1:1.2:3:15, weighing dopamine methacrylate, 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 into ultrapure water, and adding the solution into the solution in the step (1) under the stirring conditions of normal pressure and stirring speed of 200 rpm;
(4) Adding an initiator azodiisobutyronitrile according to the total weight of 0.08 percent of the raw materials, and introducing N 2 Deoxidizing for 30min;
(5) Heating at 60deg.C for reaction for 15 hr to obtain viscous light yellow transparent liquid as the product, which is the oil-water interface activated drag reducer DB 1 . The molecular weight was determined to be 7650.
Comparative example 2
(1) The molar ratio is 1:0.9:1.20:15, weighing dopamine methacrylate, 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 into ultrapure water, and adding the solution into the solution in the step (1) under the stirring conditions of normal pressure and stirring speed of 200 rpm;
(4) Adding an initiator azodiisobutyronitrile according to the total weight of 0.3 percent of the raw materials, and introducing N 2 Deoxidizing for 30min;
(5) Heating at 75deg.C for reacting for 20h to obtain viscous light brown transparent liquid as the product, which is the oil-water interface activated drag reducer DB 2 . The molecular weight was determined to be 36100.
DB was prepared at a concentration of 0.1wt% using formation water having a mineralization degree of 250000mg/L 1 、DB 2 The solution is then incubated for 2 hours in a constant temperature water bath at 50 ℃ and free water and bubbles are removed by stirring. 120g of the prepared thick oil sample was weighed into a beaker, and 120g of DB having a concentration of 0.1wt% was added, respectively 1 、DB 2 Placing the solution into a constant-temperature water bath at 50 ℃, standing for 1h at constant temperature, placing a stirring paddle at the center of a beaker and 2-3mm away from the bottom, regulating the rotating speed to 250r/min, rapidly measuring the viscosity of the thick oil emulsion by using a rotary viscometer, and calculating the viscosity reduction rate. Comparing the products obtained in comparative examples 1-2 with examples 1-4, it was found that the viscosity reduction rate of the viscosity reducer was as high as 99% with a polymer molecular weight of 10000-30000, and the viscosity reduction effect was best. The results are shown in Table 3.
TABLE 3 viscosity reducing Effect of viscosity reducing Agents of different molecular weights
| Sample number | Molecular weight | Viscosity of thick oil before viscosity reduction/mPa.s | Viscosity of thickened oil/mPa.s after viscosity reduction | Viscosity reduction rate/% |
| DB 1 | 7650 | 198600 | 32150 | 83.81 |
| B 1 | 12800 | 198600 | 1201 | 99.4 |
| B 2 | 19200 | 198600 | 805 | 99.6 |
| B 3 | 22400 | 198600 | 210 | 99.9 |
| B 4 | 25600 | 198600 | 1604 | 99.2 |
| DB 2 | 36100 | 198600 | 21366 | 89.24 |
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the disclosure, including the claims, is limited to these examples; combinations of features of the above embodiments or in different embodiments are also possible within the idea of the invention, 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 omitted modification, equivalent replacement, improvement, etc. should be included in the protection scope of the present invention, while remaining within the spirit and principle of the present invention.
Claims (8)
1. An oil-water interface activation drag reducer for thickened oil cold recovery is characterized in that: is a low molecular weight polymer obtained by inverse emulsion polymerization of salt-resistant amphiphilic monomer and lipophilic monomer with a molar ratio of 1:1.05-1.08; wherein the salt-resistant amphiphilic monomer is dopamine methacrylate, the lipophilic monomer is 1, 1-diphenyl-1, 3-butadiene, and the molecular weight of the polymer is 10000-30000.
2. The oil-water interface activation drag reducer for cold recovery of thickened oil according to claim 1, characterized in that
Thus, the structure is as follows:
。
3. the method for preparing the oil-water interface activation drag reducer for cold recovery of thickened oil according to any one of claims 1 to 2, which is characterized by comprising the following steps:
(1) Dissolving lipophilic monomer in kerosene, and stirring uniformly;
(2) Dissolving the salt-resistant amphiphilic monomer in ultrapure water, and then adding the salt-resistant amphiphilic monomer into the solution in the step (1);
(3) Adding an initiator, and introducing inert gas to deoxidize;
(4) And reacting to obtain the oil-water interface activation drag reducer for thickened oil cold recovery.
4. A method according to claim 3, wherein in step (2): the salt-resistant amphiphilic monomer dissolved in ultrapure water is required to be added to the solution of step (1) under normal pressure with a stirring rate of 100 to 300 rpm.
5. A method according to claim 3, wherein in step (3): the initiator is azodiisobutyronitrile; the initiator is used in an amount of 0.08-0.3wt% based on the total amount of the raw materials.
6. A method according to claim 3, wherein in step (4): the reaction temperature is 60-80 ℃ and the reaction time is 15-20h.
7. The use of the oil-water interface activation drag reducer for cold recovery of heavy oil according to any one of claims 1-2 in the activation drag reduction recovery of heavy oil formations of high temperature and high salt reservoirs.
8. The use according to claim 7, characterized in that: the oil-water interface activation drag reducer for cold recovery of the heavy oil is prepared into an aqueous solution with a certain mass fraction by using simulated formation water, and then the aqueous solution is injected into a heavy oil reservoir to perform interface activation drag reduction on the heavy oil.
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| CN102372817A (en) * | 2010-08-11 | 2012-03-14 | 郁锋 | Preparation method of amide derivative copolymer and application thereof |
| CN106832112A (en) * | 2017-02-21 | 2017-06-13 | 山东大学 | A kind of self-dispersion type water-soluble cationic heavy crude thinner and preparation method thereof |
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| CN102372817A (en) * | 2010-08-11 | 2012-03-14 | 郁锋 | Preparation method of amide derivative copolymer and application thereof |
| CN106832112A (en) * | 2017-02-21 | 2017-06-13 | 山东大学 | A kind of self-dispersion type water-soluble cationic heavy crude thinner and preparation method thereof |
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