CN114075310A - Two-phase viscosity regulator and preparation method thereof - Google Patents
Two-phase viscosity regulator and preparation method thereof Download PDFInfo
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- CN114075310A CN114075310A CN202010809784.8A CN202010809784A CN114075310A CN 114075310 A CN114075310 A CN 114075310A CN 202010809784 A CN202010809784 A CN 202010809784A CN 114075310 A CN114075310 A CN 114075310A
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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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
- C08F220/281—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing only one oxygen, e.g. furfuryl (meth)acrylate or 2-methoxyethyl (meth)acrylate
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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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
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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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- 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
- C09K8/60—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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Abstract
The invention relates to the technical field of oilfield exploitation, in particular to a two-phase viscosity regulator and a preparation method thereof. The two-phase viscosity regulator is prepared by the copolymerization reaction of acrylamide, methoxyethyl acrylate and sodium styrene sulfonate. The two-phase viscosity regulator provided by the invention acts on oil-water two phases, can obviously increase the viscosity of an aqueous solution, and can reduce the viscosity of thick oil by emulsifying the aqueous solution with the thick oil. The two-phase viscosity regulator can greatly change the oil-water viscosity ratio in oil reservoir exploitation, improve the oil field development effect and solve the problem of high difficulty in existing heavy oil exploitation.
Description
Technical Field
The invention relates to the technical field of oilfield exploitation, in particular to a two-phase viscosity regulator and a preparation method thereof.
Background
At present, the thermal recovery technology is generally adopted at home and abroad, the thermal recovery of the heavy oil has obvious economic and social benefits, but the thermal recovery of the heavy oil is limited by conditions such as oil deposit burial depth, thickness, net total ratio, permeability and the like, a great part of reserves can not be developed by thermal recovery, and the heavy oil is still in a low-efficiency water-drive state at present. Aiming at low-efficiency water-flooding common thickened oil, some practices of chemical agent flooding of polymers or viscosity reducers are carried out at home and abroad. If the victory oil field is also subjected to the practice of viscosity reducer flooding in the Shang II area, the daily oil yield of the SDB294-7 well after the viscosity reducer is injected into the adjacent well is improved from 3.6t/d to 5.3t/d, but after 2 months, the daily oil yield is reduced to 0.6t/d under the influence of the oil well extract, and the pure viscosity reducer flooding effect is limited. A HTLP6 horizontal well polymer flooding pilot test comprises the steps that polymer flooding starts in 5 months in 2005, the viscosity of a polymer is 13cp, the concentration is 600ppm, the initial injection speed is 140t/d, the yield of an oil well is greatly increased after onset of effect, the yield is 9 times that before polymer injection, and the oil well maintains the production of medium-low water content and high oil yield for 7 years by 2013.
The viscosity reducer for reducing the viscosity of the oil phase only is influenced by low sweep efficiency, and the recovery ratio is improved by less than 4%; the polymer flooding which is only thickened for the water phase has limited range of improving the recovery ratio of common thickened oil with larger viscosity, and is below 5 percent, and the risk of fracturing stratum exists near an injection well; by adopting a displacement mode of a polymer and viscosity reducer compound system, in the actual oil reservoir porous seepage, due to the difference of the viscosity and other properties of the polymer and the viscosity reducer, the migration speed difference exists in migration, the separation phenomenon is formed, and certain negative effects are generated on the development effect. Therefore, a more efficient development method needs to be found to solve the problems of large oil-water viscosity ratio and poor development effect.
Disclosure of Invention
The invention mainly aims to provide a two-phase viscosity regulator and a preparation method thereof. The two-phase viscosity regulator can greatly change the oil-water viscosity ratio in oil reservoir exploitation, improve the oil field development effect and solve the problem of high difficulty in existing heavy oil exploitation.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a two-phase viscosity modifier, which comprises a polymer shown in a formula I:
wherein X, Y, Z represents the degree of polymerization.
Preferably, the two-phase viscosity regulator is formed by mixing the polymer shown in the formula I and water.
Further preferably, the polymer mass concentration is 0.1 wt% to 1.0 wt%.
Further preferably, the water used may be simulated formation water.
The invention also provides a preparation method of the two-phase viscosity regulator, which comprises the steps of carrying out copolymerization reaction on acrylamide, methoxyethyl acrylate and sodium p-styrenesulfonate according to the mass ratio of (3-7) to (3-6) to (1-5), and preparing the separated and purified polymer and water into an aqueous solution with the mass concentration of the polymer of 0.1-1.0 wt% to obtain the two-phase viscosity regulator;
the main components of the substance obtained after separation and purification are polymers shown in a formula I:
wherein X, Y, Z is the polymerization degree, which is X value of 300-800, Y value of 400-800, and X value of 200-500, respectively.
The copolymerization reaction comprises the following specific steps: dissolving sodium p-styrene sulfonate in ethanol; respectively transferring the ethanol solutions of acrylamide and methoxyethyl acrylate into a dropping pump, and adjusting the speed of the dropping pump for later use; preparing azodiisobutyronitrile into an ethanol solution, mixing the ethanol solution with a sodium p-styrenesulfonate ethanol solution, heating the mixture by a magnetic stirrer to 30 ℃, simultaneously dropwise adding an acrylamide ethanol solution and a methoxyethyl acrylate ethanol solution, and continuously reacting for 120min at the temperature of 60 ℃ after dropwise adding is finished for 50-60 min. Cooling, precipitating and washing in poor solvent of the obtained product for multiple times, filtering, and vacuum drying at 60-80 deg.C. The synthesis equation is as follows:
preferably, the adverse agent is toluene or n-hexane.
The invention also provides the application of the two-phase viscosity regulator in reducing the viscosity of the thickened oil in tertiary oil recovery of the oil field.
The invention has the following beneficial effects:
(1) the two-phase viscosity regulator provided by the invention is a water-soluble viscosity reducer, can reduce the oil-water interfacial tension, can be dissolved in water and then mixed with thick oil according to a certain mass ratio to form an oil-in-water type emulsion, effectively reduces the viscosity of the thick oil and increases the fluidity of the thick oil.
(2) The two-phase viscosity regulator provided by the invention has the advantages of small dosage, obvious effect of reducing the oil-water interfacial tension and high viscosity reduction rate, and is suitable for the exploitation application of thick oil.
(3) The two-phase viscosity regulator provided by the invention has the advantages of easily available raw materials, simple preparation steps and low production cost.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
Example 1
5g of sodium p-styrene sulfonate is dissolved in 20mL of ethanol and then poured into a four-neck flask; respectively dissolving 3.3023g of acrylamide and 6.6977g of methoxyethyl acrylate in 20mL of ethanol, respectively transferring the obtained ethanol solutions to a dropping pump, and adjusting the speed of the dropping pump for later use; dissolving 0.0750g of azobisisobutyronitrile into 10mL of ethanol solution, adding the solution into sodium p-styrenesulfonate, heating the solution by a magnetic stirrer to 30 ℃, simultaneously opening a dropping pump switch of acrylamide and methoxyethyl acrylate, dropwise adding the solution into a four-neck flask, continuously reacting for 120min at the temperature of 60 ℃ after the dropwise adding is finished for 60min, cooling, precipitating and washing in poor solvent n-hexane of the obtained product for multiple times, filtering, and drying in vacuum at the temperature of 70 ℃ to obtain the polymer.
The polymer obtained above is prepared into 0.5 wt% aqueous solution by using simulated formation water, namely the two-phase viscosity regulator.
The ionic composition of the simulated formation water is shown in table 1 below.
TABLE 1 simulation of ionic composition of formation water
Example 2
The difference from example 1 is that: the amount of acrylamide used was 4.9650g, and the amount of methoxyethyl acrylate used was 5.035g, all other things being equal to example 1.
Example 3
The difference from example 1 is that: the amount of acrylamide used was 5.9664g, and the amount of methoxyethyl acrylate used was 4.0336g, all other things being equal to example 1.
Example 4
The difference from example 1 is that: the amount of acrylamide used was 6.6355g, and the amount of methoxyethyl acrylate used was 3.3645g, all other things being equal to example 1.
Example 5
The difference from example 1 is that: the polymer obtained above was formulated with simulated formation water into a 0.1 wt% aqueous solution, otherwise the same as in example 1.
Example 6
The difference from example 1 is that: the polymer obtained above was formulated with simulated formation water into a 1.0 wt% aqueous solution, otherwise the same as in example 1.
The two-phase viscosity modifiers described in examples 1 to 6 were tested for viscosity at 70 ℃ and interfacial tension with thick oil, respectively, and the results are shown in Table 2.
TABLE 2 evaluation results of Properties
The two-phase viscosity modifiers described in examples 1 to 4 were mixed with the heavy oil at a mass ratio of 2:8, and the viscosity was measured at 70 ℃ after sufficient stirring, and the viscosity reduction rate was calculated therefrom, and the results are shown in table 3;
TABLE 3 test results of viscosity reduction ratio
The test results of the above embodiments show that the two-phase viscosity modifier obtained by the implementation of the invention has higher viscosity, lower interfacial tension and better viscosity reduction rate, the two-phase viscosity modifier prepared by the invention has small dosage and excellent viscosity reduction effect, and can be used for tertiary oil recovery.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (8)
1. A two-phase viscosity modifier comprising a polymer of formula I:
wherein X, Y, Z represents the degree of polymerization.
2. The two-phase viscosity modifier of claim 1, formed by mixing the polymer of formula I with water.
3. The two-phase viscosity modifier of claim 2, wherein the polymer mass concentration is from 0.1 wt% to 1.0 wt%.
4. The two-phase viscosity modifier of claim 2, wherein the water used is simulated formation water.
5. A preparation method of a two-phase viscosity regulator is characterized in that acrylamide, methoxyethyl acrylate and sodium p-styrenesulfonate are subjected to copolymerization reaction according to the mass ratio of (3-7) to (3-6) to (1-5), and a polymer obtained after separation and purification and water are prepared into an aqueous solution with the mass concentration of the polymer of 0.1-1.0 wt% to obtain the two-phase viscosity regulator;
the main components of the substance obtained after separation and purification are polymers shown in a formula I:
wherein X, Y, Z is the polymerization degree, which is X value of 300-800, Y value of 400-800, and X value of 200-500, respectively.
6. The preparation method according to claim 5, wherein the copolymerization reaction comprises the following specific steps: dissolving sodium p-styrene sulfonate in ethanol; respectively transferring the ethanol solutions of acrylamide and methoxyethyl acrylate into a dropping pump, and adjusting the speed of the dropping pump for later use; preparing azodiisobutyronitrile into an ethanol solution, mixing the ethanol solution with a sodium p-styrenesulfonate ethanol solution, heating the mixture by a magnetic stirrer to 30 ℃, simultaneously dropwise adding an acrylamide ethanol solution and a methoxyethyl acrylate ethanol solution, and continuously reacting for 120min at the temperature of 60 ℃ after dropwise adding is finished for 50-60 min. Cooling, precipitating and washing in poor solvent of the obtained product for multiple times, filtering, and vacuum drying at 60-80 deg.C.
7. The method according to claim 6, wherein the undesirable agent is toluene or n-hexane.
8. Use of the two-phase viscosity modifier according to any one of claims 1 to 4 and the two-phase viscosity modifier prepared by the method according to any one of claims 5 to 7 for reducing the viscosity of heavy oil in tertiary oil recovery in oil fields.
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| CN202010809784.8A CN114075310B (en) | 2020-08-13 | 2020-08-13 | Two-phase viscosity regulator and preparation method thereof |
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| CN202010809784.8A CN114075310B (en) | 2020-08-13 | 2020-08-13 | Two-phase viscosity regulator and preparation method thereof |
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| CN114075310B CN114075310B (en) | 2023-01-17 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107955592A (en) * | 2017-11-24 | 2018-04-24 | 山东大学 | A kind of heavy crude thinner of demulsification certainly and preparation method and application |
| CN108659807A (en) * | 2018-07-12 | 2018-10-16 | 西安交通大学 | A kind of preparation method of intelligent nano foam flooding finish |
| US20200199442A1 (en) * | 2017-08-04 | 2020-06-25 | China National Offshore Oil Corporation | Heavy oil activator and preparation method and use thereof |
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- 2020-08-13 CN CN202010809784.8A patent/CN114075310B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20200199442A1 (en) * | 2017-08-04 | 2020-06-25 | China National Offshore Oil Corporation | Heavy oil activator and preparation method and use thereof |
| CN107955592A (en) * | 2017-11-24 | 2018-04-24 | 山东大学 | A kind of heavy crude thinner of demulsification certainly and preparation method and application |
| CN108659807A (en) * | 2018-07-12 | 2018-10-16 | 西安交通大学 | A kind of preparation method of intelligent nano foam flooding finish |
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