CN112812227A - Water-soluble amphiphilic polymer oil-displacing agent with dual responses to temperature and salt and preparation and application thereof - Google Patents
Water-soluble amphiphilic polymer oil-displacing agent with dual responses to temperature and salt and preparation and application thereof Download PDFInfo
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- 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
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Abstract
The invention relates to a water-soluble amphiphilic polymer oil displacement agent with double responses to temperature and salt, and preparation and application thereof, belonging to the field of preparation of high-temperature and high-salt oil reservoir oil displacement agents. The mol percentages of all the polymerization monomers are respectively AM (80-90%), MABPS (2.5-5%), DAAM (5-17.5%), and the mass concentration of the monomers in solvent deionized water is 2030 percent, the initiator accounts for 0.05 to 0.1 percent of the total mass of the monomers, the initiation temperature is 40 to 50 ℃, the copolymerization reaction is carried out by adopting a soap-free radical polymerization method, and N is used in the polymerization reaction process2And (4) protecting. The synthetic product is characterized in that the higher the water mineralization degree of an oil reservoir stratum or the higher the oil reservoir temperature, the higher the viscosity of the oil reservoir stratum is, the better the tackifying effect is, and the stronger the capability of controlling the water-oil fluidity ratio is. The invention is used for the polymer flooding of the high-temperature and high-salinity oil reservoir, and is suitable for the oil reservoir conditions as follows: the mineralization degree of the stratum water is higher than 3 multiplied by 104mg/L, reservoir temperature below 120 ℃.
Description
Technical Field
The invention belongs to the field of preparation of oil displacement agents for high-temperature and high-salinity oil reservoirs, and particularly relates to a water-soluble amphiphilic polymer oil displacement agent with double responses to temperature and salt.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The amphiphilic polymer is a polymer which has a molecular structure containing hydrophilic groups so that the polymer has water solubility and a small amount of hydrophobic groups to generate hydrophobic association. In aqueous solution, the amphiphilic polymer can form a reversible spatial network structure. Thus, amphiphilic polymers have unique rheological properties that are different from those of typical water-soluble polymers (such as partially Hydrolyzed Polyacrylamide (HPAM)), and have excellent viscosifying, temperature, salt, and shear properties. With the maturity and industrial application of polymer flooding technology, at present, the amphiphilic polymer as a polymer oil displacement agent has been subjected to mine field tests in various large oil fields in China, and a good effect is achieved. However, the amphiphilic polymer oil-displacing agent suitable for high-temperature and high-salt oil reservoirs needs to be deeply researched, and particularly, the amphiphilic polymer oil-displacing agent with high-efficiency tackifying, high-temperature resistance and high-salt resistance is developed and developed.
The amphiphilic polymer for oil displacement which is widely researched and applied at present is mainly subjected to hydrophobic modification on the basis of HPAM (high Performance liquid chromatography), and due to the introduction of hydrophobic groups, the amphiphilic polymer has more excellent tackifying, temperature resisting, salt resisting and shear resisting performances compared with HPAM (high Performance liquid chromatography), and can meet the requirements that the temperature is lower than 85 ℃ and the mineralization degree is lower than 3 multiplied by 104mg/LThe performance requirements of reservoir polymer flooding. However, at high temperatures (reservoir temperature higher than 85 ℃) and with a high degree of mineralization (degree of mineralization higher than 3X 10 ℃)4mg/L) reservoir conditions, the fluidity control capability of the amphiphilic polymer cannot meet the requirements of polymer flooding. Although researchers have improved and enhanced the properties of such amphiphilic polymers, such as increased molecular weight, optimized molecular structure, enhanced association strength, etc., the inventors have discovered that: it is difficult to apply to high temperature and hypersalinity oil reservoirs within the economic cost control range.
Disclosure of Invention
In order to overcome the defects, the invention provides a high-temperature-resistant high-salt-water-solubility-resistant amphiphilic polymer oil-displacing agent for polymer flooding of a high-temperature high-salt reservoir, which is designed by a molecular structure, takes Acrylamide (AM) as a hydrophilic monomer, takes N-methyl-N-allyl-N-4-butylbenzoylpropanesulfonic acid inner salt (MABPS) as a salt tackifying functional monomer and a hydrophobic association functional monomer, takes diacetone acrylamide (DAAM) as a thermal tackifying functional monomer, and obtains the water-soluble amphiphilic polymer oil-displacing agent with double responses to temperature and salt by a soap-free radical polymerization method under the action of an initiator, so that the water-soluble amphiphilic polymer oil-displacing agent has excellent fluidity control capability in the high-temperature high-salt reservoir.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
in a first aspect of the invention, a water-soluble amphiphilic polymer oil displacement agent with dual responses to temperature and salt is provided, and the structural formula of the water-soluble amphiphilic polymer oil displacement agent is as follows:
wherein x, y and z are natural numbers larger than zero.
At present, in the compounding process of an amphiphilic polymer and a functional monomer, the self polydispersity of the amphiphilic polymer, the structural and performance characteristics of different functional monomers are different, the interaction rule between the functional monomer and a system is not clear, and the like, so that the conventional amphiphilic polymer for oil displacement is difficult to have high temperature resistance and high salt resistance. In order to overcome the problems, the invention carries out long-term technical research and practical exploration on the performance change rule and the synergistic mechanism after the combination of the amphiphilic polymer and the functional monomer, and discovers that: the water-soluble amphiphilic polymer oil displacement agent has dual responsiveness to temperature and salt, and realizes the synergy of thermal tackifying and salt tackifying functions in an amphiphilic polymer.
The water-soluble amphiphilic polymer oil displacement agent with double response and viscosity increasing effects on temperature and salt has excellent capacity of increasing water phase viscosity in a high-temperature high-salt oil reservoir, so that the mobility control capacity of the oil displacement agent under the high-temperature high-salt oil reservoir is enhanced, and the oil displacement agent has great application potential.
The invention provides a preparation method of a water-soluble amphiphilic polymer oil displacement agent with double responses to temperature and salt, which takes acrylamide AM, N-methyl-N-allyl-N-4-butylbenzoylpropanesulfonic acid inner salt MABPS and diacetone acrylamide DAAM as polymerization monomers to carry out copolymerization reaction in the presence of an initiator to obtain the water-soluble amphiphilic polymer oil displacement agent.
The preparation method is simple, the oil displacement efficiency of the high-temperature high-salinity reservoir is high, the practicability is high, and the popularization is easy.
In a third aspect of the invention, the application of any one of the water-soluble amphiphilic polymer oil displacement agents with double responses to temperature and salt in treating a high-temperature and high-salinity oil reservoir is provided.
The synthetic product has higher viscosity and better tackifying effect when the water mineralization of the oil reservoir stratum is higher or the oil reservoir temperature is higher, and has stronger capability of controlling the water-oil fluidity ratio, so the synthetic product is expected to be widely applied to treating high-temperature and high-mineralization oil reservoirs.
The invention has the beneficial effects that:
(1) the invention discloses an oil displacement agent suitable for high-temperature and high-salinity reservoir polymer flooding by effectively designing each polymerization monomer in the aspects of molecular structure, monomer proportion, polymerization process and the like, and the viscosity of a polymer solution of the oil displacement agent has dual-response tackifying effect on reservoir temperature and formation water mineralization.
(2) The preparation method is simple, the oil displacement efficiency of the high-temperature high-salinity reservoir is high, the practicability is high, and the popularization is easy.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a synthetic scheme of an oil displacing agent PAMD of example 1 of the present invention.
FIG. 2 is an infrared spectrum of the oil-displacing agent PAMD of example 1 of the present invention.
FIG. 3 is a scanning electron microscope image of the oil displacement agent PAMD of the invention example 1 under different salt concentrations; wherein (a) PAMD is at 3 × 104mg/L sodium chloride solution; (b) PAMD at 20X 104mg/L sodium chloride solution.
FIG. 4 is a graph of sodium chloride concentration versus apparent viscosity of PAMD in solution according to example 1 of the present invention.
FIG. 5 is a graph of temperature versus apparent viscosity of PAMD of example 1 of the present invention in solution.
FIG. 6 is a graph of apparent viscosity in solution for PAMD of example 2 versus example 1 of the present invention.
FIG. 7 is a graph of apparent viscosity in solution for example 3 and the PAMD of example 1 of the present invention.
FIG. 8 is a graph of the relationship of apparent viscosity at different initiator concentrations for the PAMD oil displacing agent of example 1 of the present invention.
FIG. 9 is a graph of the relationship of apparent viscosity at different polymerization temperatures for the PAMD oil displacement agent of example 1 of the present invention.
FIG. 10 is a graph showing the variation of pressure difference during the core flooding process in the experimental example of the present invention;
FIG. 11 is a diagram showing an oil-water distribution of a microscopic model in an experimental example of the present invention;
FIG. 12 is a graph showing the residual oil flow process after water flooding and polymer flooding in the experimental examples of the present invention.
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 stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
A water-soluble amphiphilic polymer oil displacement agent with dual responses to temperature and salt has the following structural formula:
wherein x, y and z are natural numbers larger than zero.
In some embodiments, the weight average molecular weight of the oil displacing agent is 3.24 × 106～3.61×106. The method is characterized in that: the viscosity of the polymer solution has dual response to the water mineralization degree of the oil reservoir stratum and the oil reservoir temperature, the higher the water mineralization degree of the oil reservoir stratum or the higher the oil reservoir temperature is, the higher the viscosity is, the better the tackifying effect is, and the stronger the capability of controlling the water-oil mobility ratio is.
In some embodiments, the oil displacing agent has an infrared spectrum as shown in fig. 2. The N-methyl-N-allyl-N-4-butyl benzoyl propanesulfonic acid inner salt and diacetone acrylamide are successfully introduced into polymer molecular chain segments.
The invention also provides a preparation method of the water-soluble amphiphilic polymer oil displacement agent with double responses to temperature and salt, which takes Acrylamide (AM), N-methyl-N-allyl-N-4-butyl benzoyl propanesulfonic acid inner salt (MABPS) and diacetone acrylamide (DAAM) as polymerization monomers to carry out copolymerization reaction in the presence of an initiator to obtain the water-soluble amphiphilic polymer oil displacement agent.
In some embodiments, the molar ratio of AM, MABPS, DAAM is 80-90: 2.5-5: 5-17.5, and results show that each monomer can well participate in copolymerization reaction.
In some embodiments, the initiator is used in an amount of 0.05% to 0.1% by weight of the total mass of the polymerized monomers; with the increase of the dosage of the initiator, the apparent viscosity of the prepared amphiphilic polymer oil-displacing agent PAMD has the characteristic of increasing firstly and then reducing secondly.
In some embodiments, the copolymerization reaction adopts a soap-free radical polymerization method, the synthesis method is simple, and the product performance is stable.
In some embodiments, the copolymerization reaction is initiated at a temperature of from 40 ℃ to 50 ℃; the temperature rise is beneficial to aggravating the thermal motion of each monomer molecule in the reaction system, so that the growth probability of the polymer molecular chain is greatly improved, and a polymer product with higher relative molecular mass can be obtained.
In some embodiments, the copolymerization is carried out under an inert gas blanket to exclude air.
The invention also provides application of the water-soluble amphiphilic polymer oil-displacing agent in treatment of high-temperature and high-salinity oil reservoirs, wherein the water salinity of the oil reservoir stratum is higher than 3 multiplied by 104mg/L, and the oil reservoir temperature is not higher than 120 ℃.
The aim of the invention is achieved by the following measures: the invention discloses a water-soluble amphiphilic polymer oil-displacing agent with double responses to temperature and salt. A water-soluble amphiphilic polymer oil displacement agent (PAMD) with dual responses to temperature and salt comprises Acrylamide (AM), N-methyl-N-allyl-N-4-butyl benzoyl propanesulfonic acid inner salt (MABPS) and diacetone acrylamide (DAAM), and an initiator is azobisisobutyramidine hydrochloride (AIBA). The water-soluble amphiphilic polymer oil-displacing agent with double responses to temperature and salt has the mol percentages of all the polymerization monomers of AM (80-90%), MABPS (2.5-5%) and DAAM (5%17.5 percent below zero), the mass concentration of the monomer in solvent deionized water is 20 to 30 percent, the dosage of the initiator accounts for 0.05 to 0.1 percent of the total mass of the monomer, the initiation temperature is 40 to 50 ℃, the copolymerization reaction is carried out by adopting a soap-free radical polymerization method, and N is required in the polymerization reaction process2And (4) protecting. The synthetic product is characterized in that the higher the water mineralization degree of an oil reservoir stratum or the higher the oil reservoir temperature, the higher the viscosity of the oil reservoir stratum is, the better the tackifying effect is, and the stronger the capability of controlling the water-oil fluidity ratio is.
The present invention is described in further detail below with reference to specific examples, which are intended to be illustrative of the invention and not limiting.
Example 1
The molar ratio of all polymerization monomers of the water-soluble amphiphilic Polymer (PAMD) oil displacement agent with double responses to temperature and salt is AM: MABPS: DAAM: 86:4:10, the mass concentration of the monomers in solvent deionized water is 25%, the dosage of an initiator accounts for 0.08% of the total mass of the monomers, the initiation temperature is 45 ℃, and the copolymerization reaction is carried out by adopting a free radical polymerization method. The specific synthesis method, related characterization and performance test are as follows.
Synthetic method of PAMD oil displacement agent
And (3) synthesizing the salt-viscosifying water-soluble amphiphilic polymer oil-displacing agent by adopting a free radical polymerization method. Accurately weighing a certain amount of acrylamide, N-methyl-N-allyl lauroyl propanesulfonic acid inner salt and diacetone acrylamide, dissolving in a certain amount of deionized water, wherein the molar ratio of each polymerization monomer is AM: MABPS: DAAM: 86:4:10, the total mass concentration of the monomers is 25%, then placing in a 250mL three-neck flask, and continuously stirring to dissolve. Placing the three-neck flask in a constant-temperature water bath, and introducing N2And stirred for 0.5 hour until the solution is clear. Injecting an initiator azodiisobutyramidine hydrochloride solution by using an injector, wherein the dosage of the initiator is 0.08 percent of the total mass of the monomers. Heating to 45 deg.C, and introducing N2Continuously stirring, sealing and placing the three-neck flask for 6 hours to obtain a transparent colloidal product, taking out and cutting the transparent colloidal product into small blocks, precipitating and purifying the transparent colloidal product by using ethanol for three times, and carrying out vacuum drying and granulation to obtain the amphiphilic polymer PAMD product, wherein the calculated yield is about 96 percent. The synthetic route is shown in figure 1:
characterization and performance of salt-viscosifying water-soluble amphiphilic polymer oil-displacing agent
1. And (3) characterizing the composition of the oil displacement agent:
the composition of the synthesized salt-tackifying water-soluble amphiphilic polymer oil-displacing agent is analyzed and characterized by adopting a Vario EL III (Elementar, Germany) elemental analyzer, the mass percentages of the C, H, O, N, S elements are 52.35%, 7.23%, 21.87%, 17.73% and 0.45%, and the actual molar ratio of the monomers participating in the polymerization reaction is AM: MALPS: DAAM: 84.74:4.96:9.92, and the result shows that the monomers can well participate in the copolymerization reaction.
2. Infrared characterization of the oil displacement agent:
the molecular structure of the synthesized salt-viscosifying water-soluble amphiphilic polymer oil-displacing agent is subjected to infrared characterization by an infrared spectrometer (NICOLET 6700, USA), as shown in FIG. 2. 3420cm-1is-NH2Stretching vibration peak of 1660cm-1The peak of stretching vibration of C ═ O indicates that the synthesized product contains an acrylamide segment. Furthermore, 1190cm-1Stretching vibration peak of 1040cm for S ═ O-1Is the stretching vibration peak of S-O, 602cm-1Is C-S stretching vibration peak, 727cm-1Is long-chain alkyl- (CH)2)nPeak of rocking vibration of-964 cm-1The characteristic absorption peak of the quaternary ammonium salt shows that the inner salt of the N-methyl-N-allyl-N-4-butyl benzoyl propanesulfonic acid is successfully introduced into the molecular chain segment of the polymer. 1450cm-1The peak of bending vibration of the mixed surface of C-N and N-H is 2930cm-1is-CH3The characteristic absorption peak of (A) indicates that diacetone acrylamide is also successfully introduced into the molecular chain of the polymer.
3. Microscopic morphology of oil displacement agent in solution:
the microcosmic appearance of the synthesized PAMD oil displacement agent in the solution is characterized by adopting a Phenom ProX desktop scanning electron microscope (Phenom, USA), as shown in FIG. 3. The result shows that the PAMD oil displacement agent can form a supermolecular net structure in salt solutions with different concentrations due to association.
4. Salt viscosifying properties of oil displacing agents in solution:
using DV-II (Brookfield, U)SA) viscometer tests the apparent viscosity of the PAMD oil displacement agent in salt solutions with different concentrations (test temperature is 45 ℃, and shear rate is 7.14s-1) And performance comparison was performed using another oil-displacing agent, HPAM (molecular weight 2000 ten thousand, degree of hydrolysis 20%), as shown in fig. 4. The results show that for both oil-displacing agents at the same addition of 2000mg/L, the sodium chloride concentration increased from 0 to 20X 104At mg/L, the apparent viscosity of the PAMD displacement agent increased from 26.8 mPas to 74.1 mPas, while the apparent viscosity of the HPAM displacement agent decreased from 215 mPas to 7.2 mPas. The PAMD oil displacement agent has obvious salt tackifying property.
5. Temperature viscosifying properties of oil displacing agents in solution:
the apparent viscosities of the PAMD oil-displacing agents at different temperatures were measured using a DV-II (Brookfield, USA) viscometer (sodium chloride concentration 10X 10)4mg/L, shear rate 7.14s-1) And performance comparison was performed using another oil-displacing agent, HPAM (molecular weight 2000 ten thousand, degree of hydrolysis 20%), as shown in fig. 5. The results show that for both of the oil-displacing agents at the same loading of 2000mg/L, the apparent viscosity of the PAMD oil-displacing agent increased from 34.6 mPas to 142 mPas and then decreased to 48.7 mPas, while the apparent viscosity of the HPAM oil-displacing agent decreased from 105 mPas to 9.4 mPas, when the temperature was increased from 25 ℃ to 120 ℃. The PAMD oil displacement agent has obvious temperature viscosity increasing property.
Example 2
The difference from example 1 is that the molar ratio of AM, MABPS and DAAM is 80: 2.5: 5.
the apparent viscosities of the PAMD oil-displacing agents at different monomer ratios were measured by DV-II (Brookfield, USA) viscometer (45 deg.C, 3 × 10 concentration of sodium chloride4mg/L, shear rate 7.14s-1) And the molar ratio to the preferred example 1(AM, MABPS, DAAM 86:4: 10) a comparison of the performance was made as shown in figure 6. The results show that the viscosity-concentration curves of example 2 are all located below example 1, indicating that the viscosifying performance of example 2 is less good than that of example 1.
Example 3
The difference from example 1 is that the molar ratio of AM, MABPS, DAAM is 90: 5: 17.5.
the apparent viscosities of the PAMD oil-displacing agents at different monomer ratios were measured by DV-II (Brookfield, USA) viscometer (45 deg.C, 3 × 10 concentration of sodium chloride4mg/L, shear rate 7.14s-1) And the molar ratio to the preferred example 1(AM, MABPS, DAAM 86:4: 10) a comparison of the performance was made as shown in figure 7. The result shows that the tackifying performance of example 3 is slightly stronger than that of example 1, but the water solubility of example 3 is poor due to the larger addition amount of the hydrophobic monomer MABPS, and the good water solubility is a precondition for the polymer to be used as an oil displacement agent, and the preferred example 1 better meets various performance indexes of the polymer oil displacement agent in comprehensive consideration.
Example 4
The difference from example 1 is that the amount of the initiator used was 0.05% by mass based on the total mass of the polymerized monomers.
The apparent viscosities of the PAMD oil-displacing agents at different initiator concentrations were measured using a DV-II (Brookfield, USA) viscometer (test temperature 45 ℃ C., sodium chloride concentration 3X 104mg/L, shear rate 7.14s-1) As shown in fig. 8. The result shows that when the AIBA concentration range of the initiator is 0.05-0.1%, the apparent viscosity of the prepared amphiphilic polymer oil-displacing agent PAMD shows the characteristic of increasing firstly and then reducing, and the optimal initiator concentration is preferably 0.08%.
Example 5
The difference from example 1 is that the initiation temperature of the copolymerization reaction is 50 ℃.
The apparent viscosities of the PAMD oil-displacing agents at different polymerization temperatures were measured using a DV-II (Brookfield, USA) viscometer (sodium chloride concentration 3X 10)4mg/L, shear rate 7.14s-1) As shown in fig. 9.
The result shows that the polymerization temperature has an influence on the apparent viscosity of the prepared amphiphilic polymer oil-displacing agent PAMD. It was found in the preparation that the polymerization reaction could not be initiated at polymerization temperatures below 40 ℃. When the polymerization temperature is higher than 50 ℃, the phenomenon of 'implosion' occurs in the polymerization process, and the product is water-insoluble colloid. When the polymerization temperature is 40-50 ℃, the growth of polymer molecular chains is slow due to the lower polymerization temperature, so that the relative molecular mass of the polymer is low, and the tackifying capability is not strong. The temperature rise is beneficial to aggravating the thermal motion of each monomer molecule in the reaction system, so that the growth probability of the polymer molecular chain is greatly improved, and a polymer product with higher relative molecular mass can be obtained. However, an increase in polymerization temperature also leads to a corresponding increase in the rate of chain termination. Taking into account, the polymerization temperature was determined to be 45 ℃.
Examples of the experiments
The oil displacement performance of examples 1-5 and HPAM (molecular weight 3000 ten thousand, hydrolysis degree 25%, solid content 92%) in a specific oil reservoir were evaluated by taking the conditions of Shengli type III oil reservoir (mineralization degree 32868mg/L, calcium and magnesium ion content 874mg/L, oil reservoir temperature 85 ℃) as the study object. The crude oil used in the displacement experiment is victory oil field crude oil, and the viscosity at 85 ℃ is 23.8mPa & s. The permeability of the cores used in the displacement experiments was similar. The results of the flooding experiments under the same polymer concentration and equal injection amount are shown in the following table.
Table 1 core flooding experimental results
The effect of the polymers of the different examples on the displacement effect under isocratic equal slug injection conditions is shown in figure 10 below. After the injection of the 0.5PV polymer slug, the injection pressure all increased significantly, and the corresponding pressure rise relationship for the polymers of the different examples is: example 1> example 3> example 2> example 4> example 5> HPAM, consistent with polymer flooding recovery results.
The oil displacement performance of the embodiment 1 is the best, and the embodiment 1 is taken as an example, a glass etching micro model with a similar pore structure and permeability is adopted for displacement, the migration state of oil drops in pores in the displacement process is recorded through a high-resolution camera, the effect of the embodiment 1 in the displacement process is analyzed, and the micro oil displacement mechanism is further disclosed.
The oil and water distribution after water flooding of the micro model and the polymer flooding of example 1 is shown in fig. 11. FIG. 11(a) shows the oil-water distribution after the crude oil is saturated. When water flooding is performed, the viscous fingering phenomenon is severe due to the large water-oil mobility ratio, so that the area sweep coefficient is small, and a large amount of residual oil is still not extracted in the micro model, as shown in fig. 11 (b). The residual oil is distributed at the intersection of pores in a strip shape, a bead shape, a block shape and the like, or the oil drops form an island shape in a large pore passage. FIG. 11(c) is the oil-water distribution after the polymer flood of example 1, and it can be seen that the oil saturation in the micro model after the polymer flood is significantly reduced, which shows that the polymer flood of example 1 can further improve the oil recovery after the water flood.
Fig. 12 shows the migration distribution of oil droplets in the pores after water flooding and polymer flooding of example 1 recorded by a high resolution camera. As can be seen from fig. 12(a), there is a distribution of residual oil at the intersection of pores after water flooding. When the polymer slug migrates thereto, as is apparent from fig. 12(b), the residual oil that would otherwise accumulate at the pore intersection is emulsified into oil droplets and begins to migrate with the flow path. In addition, as can be seen by comparing the residual oil utilization at the pore "dead end" after water flooding and polymer flooding (fig. 12c and 12d), the residual oil at the pore "dead end" can be utilized to a certain extent, and the microscopic oil washing efficiency is improved.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the present invention has been described with reference to the specific embodiments, it should be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A water-soluble amphiphilic polymer oil-displacing agent with double responses to temperature and salt is characterized by having the following structural formula:
wherein x, y and z are natural numbers larger than zero.
2. The water-soluble amphiphilic polymer oil-displacing agent having dual responses to temperature and salt according to claim 1, wherein the weight average molecular weight of the oil-displacing agent is 3.24 x 106～3.61×106。
3. A preparation method of a water-soluble amphiphilic polymer oil displacement agent with double responses to temperature and salt is characterized in that Acrylamide (AM), N-methyl-N-allyl-N-4-butyl benzoyl propanesulfonic acid inner salt MABPS and diacetone acrylamide (DAAM) are used as polymerization monomers to carry out copolymerization reaction in the presence of an initiator to obtain the water-soluble amphiphilic polymer oil displacement agent.
4. The method for preparing the water-soluble amphiphilic polymer oil-displacing agent with dual responses to temperature and salt according to claim 3, wherein the molar ratio of AM, MABPS and DAAM is 80-90: 2.5-5: 5-17.5.
5. The method for preparing the water-soluble amphiphilic polymer oil-displacing agent with dual responses to temperature and salt according to claim 3, wherein the amount of the initiator is 0.05-0.1% of the total mass of the polymerized monomers.
6. The method for preparing a water-soluble amphiphilic polymer oil-displacing agent having dual responses to temperature and salt according to claim 3, wherein the copolymerization reaction adopts a soap-free radical polymerization method.
7. The method for preparing the water-soluble amphiphilic polymer oil-displacing agent with dual responses to temperature and salt according to claim 3, wherein the initiation temperature of the copolymerization reaction is 40 ℃ to 50 ℃.
8. The method for preparing the water-soluble amphiphilic polymer oil-displacing agent with dual responses to temperature and salt according to claim 3, wherein the copolymerization reaction is carried out under the protection of inert gas.
9. A water-soluble amphiphilic polymer oil-displacing agent having dual responses to temperature and salt prepared by the method of any one of claims 3-8.
10. Use of the water-soluble amphiphilic polymer oil-displacing agent with dual responses to temperature and salt according to any one of claims 1, 2 and 9 in treatment of high-temperature and hypersalinity oil reservoirs.
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