CN114805677B - Polymer oil-displacing agent and preparation method thereof - Google Patents
Polymer oil-displacing agent and preparation method thereof Download PDFInfo
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- 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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Abstract
The invention provides a polymer oil-displacing agent and a preparation method thereof, which relate to the field of oilfield chemical additives and high polymer polymerization, and the method comprises the following steps: reacting nitrile compounds, fuming sulfuric acid and long-chain olefin to obtain a dendritic branched monomer; uniformly mixing the dendritic branched monomer, acrylamide, acrylic acid, deionized water and a pH regulator to obtain a mixed solution; and introducing nitrogen into the mixed solution, and then adding an initiator to initiate polymerization reaction to obtain the polymer oil-displacing agent, so as to obtain the polymer oil-displacing agent. The polymer oil-displacing agent prepared by the invention has strong chelating effect on calcium and magnesium ions, is suitable for operation in high-salinity areas, has salt resistance, high temperature resistance and higher thermal stability, and still has higher retention rate of solution viscosity after 3 months at 120 ℃ under the anaerobic condition.
Description
Technical Field
The invention relates to the technical field of oilfield chemical additives and high polymer polymerization, in particular to a polymer oil-displacing agent and a preparation method thereof.
Background
The polymer oil displacement technology is one of important technologies for improving the crude oil recovery rate of an oil field, and the viscosity of an aqueous solution is improved by adding a polymer oil displacement agent into the aqueous solution, so that the fluidity is regulated and controlled to improve the crude oil recovery rate. Polyacrylamide and partially hydrolyzed polyacrylamide are the most used polymer oil displacement agents in oil fields at present.
At present, in view of the characteristics of high oil reservoir temperature and high mineralization degree in tertiary oil recovery, in order to enable a polymer oil displacement agent to achieve an ideal effect, a polymer must have good tackifying capability and strong temperature resistance and salt resistance. Although the partially hydrolyzed polyacrylamide has excellent tackifying performance in fresh water, the viscosity of a polymer solution is sharply reduced along with the increase of the mineralization and the temperature, the higher the molecular weight, the more easily the degradation at high temperature, and the failure of effective oil displacement, the polymer concentration has to be increased in practical application, which undoubtedly increases the difficulty in dissolution and transportation, and also sharply increases the production cost, thus causing great limitation on popularization and application.
Disclosure of Invention
The embodiment of the invention provides a polymer oil-displacing agent and a preparation method thereof, the polymer oil-displacing agent has excellent salt resistance and high temperature resistance, is suitable for operation in high-salinity areas, and has high retention rate of solution viscosity at 120 ℃.
In a first aspect, the present invention provides a method for preparing a polymer oil-displacing agent, the method comprising:
reacting nitrile compounds, fuming sulfuric acid and long-chain olefin to obtain a dendritic branched monomer;
uniformly mixing the dendritic branched monomer, acrylamide, acrylic acid, deionized water and a pH regulator to obtain a mixed solution;
and introducing nitrogen into the mixed solution, and then adding an initiator to initiate polymerization reaction to obtain the polymer oil-displacing agent.
Preferably, the nitrile compound is isopropylidene malononitrile or 2-methylene glutaronitrile.
Preferably, the long-chain olefin is at least one of 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene and 1-heptadecene.
More preferably, the long chain olefin is 1-tridecene or 1-tetradecene.
Preferably, the mass ratio of the nitrile compound to the fuming sulfuric acid to the long-chain olefin is 1 (3.5-3.7) to (3.8-4).
Preferably, the obtaining of the dendritic branching monomer comprises:
adding the fuming sulfuric acid into the nitrile compound at the temperature of between 5 ℃ below zero and 3 ℃ below zero, and introducing the gasified long-chain olefin for reaction after the fuming sulfuric acid is added to obtain a dendritic branched monomer; wherein the temperature of the reaction is controlled to be not higher than 45 ℃.
Preferably, the polymer oil displacement agent is prepared from the following raw materials in parts by weight: 8-15 parts of tree-like branched monomer, 230-260 parts of acrylamide, 60-90 parts of acrylic acid, 584-669 parts of deionized water, 33-51 parts of pH regulator and 0.07-0.5 part of initiator.
Preferably, the pH regulator is at least one of sodium hydroxide, potassium hydroxide, sodium carbonate, and potassium carbonate.
More preferably, the pH adjusting agent is sodium hydroxide.
Preferably, the pH value of the mixed solution is 7-7.5.
Preferably, the initiator includes azo-type initiators and redox initiators;
the azo initiator is azobisisobutyronitrile or azobisisoheptonitrile;
the redox initiator comprises an oxidizing agent and a reducing agent, wherein the oxidizing agent is ammonium persulfate or potassium persulfate; the reducing agent is ferrous sulfate or sodium bisulfite.
More preferably, the azo initiator is azobisisobutyronitrile; the redox initiator is ammonium persulfate and ferrous sulfate.
Preferably, the time for introducing the nitrogen is 40-50 min.
More preferably, the time for introducing nitrogen is 50 min.
Preferably, the initiation temperature for initiating the polymerization reaction is 4-6 ℃.
Preferably, after the initiator is added to initiate the polymerization reaction, the polymerization reaction is subjected to heat release and temperature rise until the temperature of the polymerization reaction reaches 70-80 ℃ and is not heated any more, and then the temperature is kept for 1-2 hours to obtain the polymer oil-displacing agent; wherein the temperature of the heat preservation is 70-80 ℃.
In a second aspect, the invention provides a polymer oil displacement agent prepared by the preparation method of any one of the first aspect.
Compared with the prior art, the invention at least has the following beneficial effects:
the invention firstly prepares a novel dendritic branched monomer containing a sulfonic acid group and a hydrophobic group, and the dendritic branched monomer is copolymerized with acrylamide and acrylic acid to prepare the polymer oil displacement agent containing the dendritic branched structure, which has a stronger spatial structure, can increase the viscosity of a solution, and has excellent salt resistance and high temperature resistance. Meanwhile, the dendritic branched monomer contains sulfonic acid group and long-chain hydrophobic alkyl, so that the dendritic branched monomer has strong chelation on calcium and magnesium ions, is suitable for operation in high-salinity areas, is high-temperature resistant, and still has high retention rate of viscosity in a solution at 120 ℃.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions of the present invention will be described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the protection scope of the present invention.
The invention provides a preparation method of a polymer oil-displacing agent, which comprises the following steps:
step (1): reacting nitrile compounds, fuming sulfuric acid and long-chain olefin to obtain a dendritic branched monomer;
step (2): uniformly mixing a dendritic branching monomer, acrylamide, acrylic acid, deionized water and a pH regulator to obtain a mixed solution;
and (3): and introducing nitrogen into the mixed solution, and then adding an initiator to initiate polymerization reaction to obtain the polymer oil-displacing agent.
It should be noted that the polymer oil-displacing agent prepared by the method is anionic polyacrylamide in a colloidal state, and the polymer oil-displacing agent is granulated, dried and milled to obtain an oil-displacing agent product and is packaged, so that the polymer oil-displacing agent is more convenient to store and transport, and the transportation cost can be further reduced. Wherein the drying temperature is 70-80 deg.C (for example, 70 deg.C, 72 deg.C, 74 deg.C, 75 deg.C, 76 deg.C, 78 deg.C or 80 deg.C), and the drying time is 1-1.5 h (for example, 1h, 1.2h or 1.5 h).
According to some preferred embodiments, the nitrile compound is isopropylidene malononitrile or 2-methylene glutaronitrile.
According to some preferred embodiments, the long chain olefin is at least one of 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene.
At least one of them is a mixture of any one or any several of them mixed in any ratio.
According to some more preferred embodiments, the long chain olefin is 1-tridecene or 1-tetradecene.
In the invention, if the carbon number of the long-chain olefin is less than 11, the carbon chain is too short, so that a hydrophobic micro-region formed by the polymer oil-displacing agent is shorter, and the temperature resistance and the thermal stability of the polymer oil-displacing agent are insufficient; if the carbon number of the long-chain olefin is higher than 17, the carbon chain is too long, so that the polymer oil-displacing agent has poor solubility and even insolubility.
According to some preferred embodiments, the mass ratio of nitrile compound, oleum and long chain olefin is 1 (3.5-3.7) to (3.8-4) (e.g., may be 1:3.5:3.8, 1:3.5:3.9, 1:3.5:4, 1:3.6:3.8, 1:3.6:3.9, 1:3.6:4, 1:3.7:3.8, 1:3.7:3.9 or 1:3.7: 4).
According to some preferred embodiments, dendritic branching monomers are obtained comprising:
adding fuming sulfuric acid into a nitrile compound under the temperature of-5 to-3 ℃ (for example, -5 ℃, -4.5 ℃, -4 ℃, -3.5 ℃ or-3 ℃), and after the fuming sulfuric acid is added, introducing gasified long-chain olefin for carrying out a Riter reaction to obtain a dendritic branched monomer; wherein the reaction temperature is controlled to be not higher than 45 ℃ (for example, 45 ℃, 44 ℃, 42 ℃, 41 ℃, 40 ℃, 38 ℃, 35 ℃ and the like can be used).
Specifically, fuming sulfuric acid is dripped into a nitrile compound under the conditions of-5 to-3 ℃ (for example, -5 ℃, -4.5 ℃, -4 ℃, -3.5 ℃ or-3 ℃), the temperature of the system is controlled to be not higher than-2 ℃, after the fuming sulfuric acid is dripped, gasified long-chain olefin is introduced, the temperature is naturally raised to 30 ℃ depending on the reaction heat, the reaction temperature is controlled to be not higher than 45 ℃, and the temperature is kept for 30min at 35-45 ℃ so as to enable the reaction to be more sufficient; slowly cooling to about 10 ℃ after the heat preservation is finished so as to separate out reactants after cooling; then obtaining the tree-shaped branched monomer after centrifugal separation and drying.
Experiments prove that the gasified long-chain olefin is introduced selectively, so that the raw materials are contacted more fully, the reaction is more complete, and the temperature is controlled while the branching degree of the dendritic branching monomer is controlled. If liquid long-chain olefin is directly introduced, the reaction temperature is difficult to control, and the branching degree is incomplete, so that the required dendritic branching monomer cannot be obtained.
In the invention, the chemical structural formula of the tree-like branched monomer is shown as
Or
(ii) a Wherein R is- (CH) 2 ) n And n is the number of carbon atoms in the long-chain olefin.
According to some preferred embodiments, the weight parts of the raw materials used to prepare the polymer oil-displacing agent are as follows: 8 to 15 parts (for example, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts or 15 parts) of a tree-like branched monomer, 230 to 260 parts (for example, 230 parts, 235 parts, 240 parts, 245 parts, 250 parts, 255 parts or 260 parts) of acrylamide, 60 to 90 parts (for example, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts or 90 parts) of acrylic acid, 584 to 669 parts (for example, 584 parts, 585 parts, 590 parts, 595 parts, 600 parts, 610 parts, 620 parts, 625 parts, 630 parts, 640 parts, 650 parts, 655 parts, 660 parts or 669 parts) of deionized water, 33 to 51 parts (for example, 33 parts, 35 parts, 38 parts, 40 parts, 42 parts, 45 parts, 46 parts, 48 parts, 50 parts or 51 parts) of a pH adjuster, 0.07 to 0.5 parts (for example, 0.07 parts, 0.09 parts, 0.1 part, 0.35 parts, 0.5 parts, 0.9 parts or 260 parts of an initiator, 0.9 parts of a.9 parts of a, 0.4 parts, 0.45 parts, or 0.5 parts).
In the invention, the viscosity and the performance of the polymer oil displacement agent are controlled by adjusting the dosage of the dendritic branched monomer, the acrylamide and the acrylic acid, so as to ensure that the polymer oil displacement agent still has stable performance under the conditions of high temperature and high mineralization degree.
According to some preferred embodiments, the pH adjusting agent is at least one of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate.
According to some more preferred embodiments, the pH adjusting agent is sodium hydroxide.
According to some preferred embodiments, the pH of the mixed solution is 7 to 7.5 (e.g., may be 7, 7.1, 7.2, 7.3, 7.4, or 7.5).
Experiments prove that the pH value of the mixed solution is adjusted to 7-7.5 (so that the influence of the pH value of a reaction medium on the decomposition rate of an initiator can be avoided, the polymerization degree of the polymer oil displacement agent is ensured, the environment of the reaction medium is neutral, and the preparation process is environment-friendly.
In the invention, water is used as a reaction medium of the polymerization reaction, so that the cost is low, the influence of an organic solvent on environmental pollution can be eliminated, the preparation process is simple, and heating is not required. And the environment of the reaction medium is neutral, the preparation process is environment-friendly, pollution-free, low in energy consumption, nontoxic and noncorrosive in the product, and free of secondary pollution, and the method conforms to the development direction of green and environment-friendly chemical additives.
According to some preferred embodiments, the initiator comprises an azo-type initiator and a redox initiator;
the azo initiator is azobisisobutyronitrile or azobisisoheptonitrile;
the redox initiator comprises an oxidant and a reducing agent, wherein the oxidant is ammonium persulfate or potassium persulfate; the reducing agent is ferrous sulfate or sodium bisulfite.
According to some more preferred embodiments, the azo-type initiator is azobisisobutyronitrile; the redox initiator is ammonium persulfate and ferrous sulfate.
In the invention, the composite initiator can promote the temperature of a reaction system to rise by virtue of heat released by initiating polymerization reaction at low temperature by using the redox initiator, so that the azo initiator is decomposed to generate free radicals to continuously initiate polymerization reaction, and the conversion rate of polymerization reaction and the molecular weight of a polymer are improved while the energy consumption is reduced.
According to some preferred embodiments, the nitrogen is introduced for a period of 40 to 50min, for example, 40min, 42min, 45min, 46min, 48min or 50 min).
According to some more preferred embodiments, the nitrogen is passed over a period of 50 min.
In the present invention, since oxygen is used as a polymerization inhibitor and affects the polymerization reaction of polyacrylamide, nitrogen is introduced to remove oxygen to ensure the normal progress of the polymerization reaction.
According to some preferred embodiments, the initiation temperature for initiating the polymerization reaction is 4 to 6 ℃ (e.g., 4 ℃, 4.5 ℃, 5 ℃, 5.5 ℃ or 6 ℃).
According to some preferred embodiments, after the initiator is added to initiate the polymerization reaction, the polymerization reaction is subjected to heat release and temperature rise until the temperature of the polymerization reaction reaches 70-80 ℃ (for example, 70 ℃, 72 ℃, 75 ℃, 77 ℃ or 80 ℃) and after the temperature rise is stopped, the temperature is kept for 1-2 h (for example, 1h, 1.5h or 2 h) to obtain the polymer oil displacement agent; wherein the temperature for heat preservation is 70-80 ℃.
In the invention, because the reaction is exothermic, if the polymerization reaction is initiated at a higher temperature, the higher temperature increases the collision chance of free radicals, so that the reaction rate is accelerated, the heat release is too fast, the control is not easy, and the danger of overflow, even scald and the like can be generated; however, initiation of the copolymerization reaction at a lower temperature reduces the chance of radical collisions, slows down chain growth, and affects the molecular weight of the polyacrylamide. Therefore, the initiation temperature is 4-6 ℃ by limitation. Therefore, the copolymerization reaction can be completed by means of the heat release of the self reaction after initiation, and the temperature of the system is about 70-80 ℃ after the reaction is finished.
The invention also provides a polymer oil-displacing agent prepared by the preparation method.
In order to more clearly illustrate the technical scheme and advantages of the present invention, a polymer oil displacement agent and a preparation method thereof are described in detail by several examples.
In the following examples, the mass of the nitrile compound, fuming sulfuric acid, long-chain olefin, dendritic branching monomer, acrylamide, acrylic acid, deionized water, pH adjuster, and initiator are all expressed in parts by weight.
Example 1
Preparation of dendritic branched monomer:
adding 30 parts of isopropylidene malononitrile into a reactor, cooling the reactor to-3 ℃, then dropwise adding 111 parts of fuming sulfuric acid, controlling the temperature of the reactor to be lower than-2 ℃, starting to introduce 120 parts of gasified 1-tetradecene for reaction after finishing adding the fuming sulfuric acid after 5min, naturally heating to 30 ℃ depending on reaction heat, starting to control the reaction temperature to be not higher than 45 ℃, and preserving the heat at 35-45 ℃ for 30 min; then slowly cooling the reactor to about 10 ℃, and carrying out centrifugal separation and drying to obtain the tree-like branched monomer.
Preparation of polymer oil displacement agent:
(1) sequentially adding 8 parts of dendritic branched monomer, 230 parts of acrylamide, 60 parts of acrylic acid and 669 parts of deionized water into a mixing kettle, and uniformly mixing to obtain a mixed solution; then, 34 parts of sodium hydroxide was added to adjust the pH of the mixed solution to 7.3;
(2) and introducing nitrogen into the mixed solution for 50min, adding 0.33 part of initiator (comprising 0.3 part of azodiisobutyronitrile, 0.02 part of ammonium persulfate and 0.01 part of ferrous sulfate) at 4-6 ℃ to initiate polymerization reaction, heating the polymerization reaction until the temperature is not increased, and keeping the temperature at 70-80 ℃ for 2h to obtain the polymer oil displacement agent.
Example 2
Example 2 is essentially the same as example 1, except that:
preparation of polymer oil displacement agent:
(1) sequentially adding 10 parts of tree-like branched monomer, 230 parts of acrylamide, 60 parts of acrylic acid and 666 parts of deionized water into a mixing kettle, and uniformly mixing to obtain a mixed solution; then, 34 parts of sodium hydroxide was added to adjust the pH of the mixed solution to 7.3;
(2) and introducing nitrogen into the mixed solution for 50min, adding 0.4 part of initiator (comprising 0.3 part of azodiisobutyronitrile, 0.05 part of ammonium persulfate and 0.05 part of ferrous sulfate) at 4-6 ℃ to initiate polymerization reaction, heating the polymerization reaction until the temperature is not increased, and keeping the temperature at 70-80 ℃ for 2h to obtain the polymer oil displacement agent.
Example 3
Preparation of dendritic branched monomer:
adding 40 parts of isopropylidene malononitrile into a reactor, cooling the reactor to-3 ℃, then dropwise adding 146 parts of oleum, controlling the temperature of the reactor to be lower than-2 ℃, starting to introduce 145 parts of gasified 1-tetradecene for reaction after the oleum is added after 5min, naturally raising the temperature to 30 ℃ by virtue of the reaction heat, starting to control the reaction temperature to be not higher than 45 ℃, and preserving the temperature for 30min at 35-45 ℃; then slowly cooling the reactor to about 10 ℃, and carrying out centrifugal separation and drying to obtain the tree-like branched monomer.
Preparation of polymer oil displacement agent:
(1) sequentially adding 15 parts of dendritic branched monomer, 260 parts of acrylamide, 90 parts of acrylic acid and 585 parts of deionized water into a mixing kettle, and uniformly mixing to obtain a mixed solution; then 50 parts of sodium hydroxide is added to adjust the pH of the mixed solution to 7.3;
(2) and introducing nitrogen into the mixed solution for 50min, adding 0.1 part of initiator (comprising 0.08 part of azodiisobutyronitrile, 0.01 part of ammonium persulfate and 0.01 part of ferrous sulfate) at 4-6 ℃ to initiate polymerization reaction, heating the polymerization reaction until the temperature is not increased, and keeping the temperature at 70-80 ℃ for 2h to obtain the polymer oil displacement agent.
Example 4
Example 4 is essentially the same as example 3, except that:
preparation of dendritic branched monomer:
adding 35 parts of 2-methylene glutaronitrile into a reactor, cooling the reactor to-3 ℃, then dropwise adding 125 parts of fuming sulfuric acid, controlling the temperature of the reactor to be lower than-2 ℃, starting to introduce 130 parts of gasified 1-tridecene for reaction after 5min of adding the fuming sulfuric acid, naturally heating to 30 ℃ depending on reaction heat, starting to control the reaction temperature to be not higher than 45 ℃, and preserving the heat at 35-45 ℃ for 30 min; then slowly cooling the reactor to about 10 ℃, and carrying out centrifugal separation and drying to obtain the tree-like branched monomer.
Example 5
Example 5 is essentially the same as example 1, except that: in the preparation of the polymer oil-displacing agent, the pH of the mixed solution was adjusted to 7.
Example 6
Example 6 is essentially the same as example 1, except that: in the preparation of the polymer oil-displacing agent, the pH of the mixed solution was adjusted to 7.5.
Comparative example 1
Comparative example 1 is substantially the same as example 1 except that: in the preparation of the polymer oil displacement agent, the dendritic branched monomer is not prepared, and 17 parts of deionized water is added instead, namely 686 parts of deionized water in total.
Comparative example 2
Comparative example 2 is substantially the same as example 2 except that: in the preparation of the polymer oil-displacing agent, 30 parts of dendritic branched monomer is added instead of less than 20 parts of deionized water, namely 646 parts of deionized water in total.
The polymer oil displacement agents in the colloidal state obtained in examples 1 to 6 and comparative examples 1 to 2 were subjected to granulation, drying, grinding, and sieving in this order to obtain samples with a mesh number of 20 to 100, the samples were dissolved to prepare solutions to be tested, and the solutions to be tested were subjected to viscosity testing at different temperatures (the temperatures were 45 ℃, 55 ℃, 80 ℃, and 120 ℃, respectively) using a viscometer, to obtain the test data shown in table 1. And the test data shown in table 2 were obtained by testing the viscosity of the solution to be tested at 45 deg.C, 55 deg.C, 80 deg.C, 120 deg.C, respectively, after 3 months in the absence of oxygen.
Specifically, the sample is added into a solution with a mineralization degree of 85000mg/L (wherein the total amount of calcium ions and magnesium ions is 3100 mg/L), and a solution to be tested with a concentration of 1500mg/L is prepared. During the test, an NDJ-1C high-temperature Brookfield viscometer is used for viscosity test.
It should be noted that, since the amount of the dendritic branching monomer added in comparative example 2 was large, the polymer solution obtained was poor in solubility when the dissolution was carried out, and the next test could not be carried out.
As can be seen from the data in Table 1, the polymer oil displacement agent prepared by the embodiment of the invention has excellent salt resistance, high temperature resistance and higher thermal stability. The viscosity of the polymer oil displacement agent solution is not lower than 69mPa & s at 45 ℃; the viscosity of the high-temperature-resistant polyurethane resin is not lower than 60mPa & s at 120 ℃, and the high-temperature-resistant polyurethane resin shows good temperature resistance. As can be seen from Table 2, the viscosity retention rates after 3 months at 45 deg.C, 55 deg.C, 80 deg.C and 120 deg.C under oxygen-free conditions were 95%, 93%, 91% and 89% or more, respectively, and the heat stability was high.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A preparation method of a polymer oil-displacing agent is characterized by comprising the following steps:
reacting nitrile compounds, fuming sulfuric acid and long-chain olefin to obtain a dendritic branched monomer; the nitrile compound is isopropylidene malononitrile or 2-methylene glutaronitrile; the long-chain olefin is at least one of 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene and 1-heptadecene;
uniformly mixing the dendritic branched monomer, acrylamide, acrylic acid, deionized water and a pH regulator to obtain a mixed solution;
introducing nitrogen into the mixed solution, and then adding an initiator to initiate polymerization reaction to obtain the polymer oil-displacing agent;
the polymer oil displacement agent is prepared from the following raw materials in parts by weight: 8-15 parts of dendritic branching monomer, 230-260 parts of acrylamide, 60-90 parts of acrylic acid, 584-669 parts of deionized water, 33-51 parts of pH regulator and 0.07-0.5 part of initiator.
2. The method of claim 1, wherein:
the mass ratio of the nitrile compound to the fuming sulfuric acid to the long-chain olefin is 1 (3.5-3.7) to 3.8-4.
3. The method of claim 1, wherein:
the obtained tree-like branched monomer comprises:
adding the fuming sulfuric acid into the nitrile compound at the temperature of between 5 ℃ below zero and 3 ℃ below zero, and introducing the gasified long-chain olefin for reaction after the fuming sulfuric acid is added to obtain a dendritic branched monomer; wherein the temperature of the reaction is controlled to be not higher than 45 ℃.
4. The method of claim 1, wherein:
the pH regulator is at least one of sodium hydroxide, potassium hydroxide, sodium carbonate and potassium carbonate.
5. The production method according to claim 1, characterized in that:
the pH value of the mixed solution is 7-7.5.
6. The method of claim 1, wherein:
the initiator comprises an azo initiator and a redox initiator;
the azo initiator is azobisisobutyronitrile or azobisisoheptonitrile;
the redox initiator comprises an oxidant and a reducing agent, wherein the oxidant is ammonium persulfate or potassium persulfate; the reducing agent is ferrous sulfate or sodium bisulfite.
7. The method of claim 1, wherein:
and the time for introducing the nitrogen is 40-50 min.
8. The method of claim 1, wherein:
the initiation temperature for initiating the polymerization reaction is 4-6 ℃.
9. The production method according to any one of claims 1 to 8, characterized in that:
after the initiator is added to initiate polymerization reaction, enabling the polymerization reaction to release heat and raise the temperature until the temperature of the polymerization reaction reaches 70-80 ℃ and no temperature is raised, and then preserving heat for 1-2 hours to obtain the polymer oil-displacing agent; wherein the temperature of the heat preservation is 70-80 ℃.
10. A polymer oil-displacing agent characterized by being produced by the production method according to any one of claims 1 to 9.
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| US20090069522A1 (en) * | 2007-09-11 | 2009-03-12 | Hessefort Yin Z | Hydrophobically modified polymers |
| CN101205281A (en) * | 2007-12-12 | 2008-06-25 | 中国科学院长春应用化学研究所 | Water-soluble hydrophobic associated copolymer and preparation thereof |
| CN101225144B (en) * | 2008-02-04 | 2011-03-30 | 中国科学院长春应用化学研究所 | Water-soluble hydrophobic associated copolymer and preparation thereof |
| US9475894B2 (en) * | 2013-06-25 | 2016-10-25 | China Petroleum & Chemical Corporation | Dendritic polymer, dendritic polymer monomer, and hyperbranched copolymer |
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Denomination of invention: A polymer oil displacement agent and its preparation method Effective date of registration: 20230904 Granted publication date: 20220902 Pledgee: Dongying Bank Co.,Ltd. Xianhe sub branch Pledgor: SHANDONG NUOER BIOLOGICAL TECHNOLOGY Co.,Ltd. Registration number: Y2023980055138 |