CN114907519A - Quaternary copolymerization synthesis temperature-resistant salt-resistant polyacrylamide, and preparation method and application thereof - Google Patents
Quaternary copolymerization synthesis temperature-resistant salt-resistant polyacrylamide, and preparation method and application thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 5
- 238000007334 copolymerization reaction Methods 0.000 title claims description 28
- 150000003839 salts Chemical class 0.000 title claims description 22
- 229920002401 polyacrylamide Polymers 0.000 title description 22
- 230000015572 biosynthetic process Effects 0.000 title description 7
- 238000003786 synthesis reaction Methods 0.000 title description 7
- 239000000178 monomer Substances 0.000 claims abstract description 60
- 229920001577 copolymer Polymers 0.000 claims abstract description 48
- 238000006073 displacement reaction Methods 0.000 claims abstract description 12
- 239000011575 calcium Substances 0.000 claims abstract description 10
- 150000001875 compounds Chemical class 0.000 claims abstract description 10
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 4
- 239000011777 magnesium Substances 0.000 claims abstract description 4
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 4
- 229920000642 polymer Polymers 0.000 claims description 96
- 239000000243 solution Substances 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 33
- 238000006243 chemical reaction Methods 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 239000007787 solid Substances 0.000 claims description 22
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 18
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 15
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 15
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 13
- 239000003999 initiator Substances 0.000 claims description 11
- 239000011780 sodium chloride Substances 0.000 claims description 10
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 9
- 239000000654 additive Substances 0.000 claims description 9
- 230000033558 biomineral tissue development Effects 0.000 claims description 9
- 230000000996 additive effect Effects 0.000 claims description 8
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 claims description 7
- 239000007864 aqueous solution Substances 0.000 claims description 7
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 6
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 6
- 239000004202 carbamide Substances 0.000 claims description 6
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 6
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 6
- FWFUWXVFYKCSQA-UHFFFAOYSA-M sodium;2-methyl-2-(prop-2-enoylamino)propane-1-sulfonate Chemical compound [Na+].[O-]S(=O)(=O)CC(C)(C)NC(=O)C=C FWFUWXVFYKCSQA-UHFFFAOYSA-M 0.000 claims description 6
- 125000000217 alkyl group Chemical group 0.000 claims description 5
- 238000004090 dissolution Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910021389 graphene Inorganic materials 0.000 claims description 4
- ACWKAVFAONSRKJ-UHFFFAOYSA-M hexadecyl-dimethyl-prop-2-enylazanium;chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCC[N+](C)(C)CC=C ACWKAVFAONSRKJ-UHFFFAOYSA-M 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 229920002647 polyamide Polymers 0.000 claims description 4
- 125000000008 (C1-C10) alkyl group Chemical group 0.000 claims description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 claims description 3
- 239000002318 adhesion promoter Substances 0.000 claims description 3
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 claims description 3
- 229910052736 halogen Inorganic materials 0.000 claims description 2
- 150000002367 halogens Chemical group 0.000 claims description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N dimethylmethane Natural products CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims 1
- 239000001294 propane Substances 0.000 claims 1
- 239000003921 oil Substances 0.000 description 43
- 230000002209 hydrophobic effect Effects 0.000 description 23
- 238000011084 recovery Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 230000000694 effects Effects 0.000 description 6
- 230000015784 hyperosmotic salinity response Effects 0.000 description 6
- 238000006116 polymerization reaction Methods 0.000 description 6
- 238000011160 research Methods 0.000 description 6
- 239000011734 sodium Substances 0.000 description 6
- 239000004094 surface-active agent Substances 0.000 description 6
- 229920003169 water-soluble polymer Polymers 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000000693 micelle Substances 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 125000002091 cationic group Chemical group 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 125000001165 hydrophobic group Chemical group 0.000 description 4
- 238000012703 microemulsion polymerization Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000003208 petroleum Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- OZAIFHULBGXAKX-VAWYXSNFSA-N AIBN Substances N#CC(C)(C)\N=N\C(C)(C)C#N OZAIFHULBGXAKX-VAWYXSNFSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 229920001600 hydrophobic polymer Polymers 0.000 description 3
- 239000004530 micro-emulsion Substances 0.000 description 3
- 238000002390 rotary evaporation Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical group [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical group [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Chemical group BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 2
- 229910052794 bromium Inorganic materials 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000460 chlorine Chemical group 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 125000001153 fluoro group Chemical group F* 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 125000001453 quaternary ammonium group Chemical group 0.000 description 2
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 125000006527 (C1-C5) alkyl group Chemical group 0.000 description 1
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical group [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000002144 chemical decomposition reaction Methods 0.000 description 1
- 229920000891 common polymer Polymers 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- AVWKSSYTZYDQFG-UHFFFAOYSA-M dimethyl-octadecyl-prop-2-enylazanium;chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCC[N+](C)(C)CC=C AVWKSSYTZYDQFG-UHFFFAOYSA-M 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000009881 electrostatic interaction Effects 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- UYMKPFRHYYNDTL-UHFFFAOYSA-N ethenamine Chemical compound NC=C UYMKPFRHYYNDTL-UHFFFAOYSA-N 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011630 iodine Chemical group 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- -1 phosphonium salt ions Chemical class 0.000 description 1
- 238000011020 pilot scale process Methods 0.000 description 1
- 229920000867 polyelectrolyte Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Lubricants (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The application discloses a temperature-resistant salt-tolerant copolymer, wherein a monomer of the temperature-resistant salt-tolerant copolymer comprises compounds shown in a formula I, a formula II and a formula III. And a preparation method and application thereof in oil displacement, in particular to application in oil displacement in a high calcium and magnesium environment.
Description
Technical Field
The application relates to a quaternary copolymerization synthesis temperature-resistant salt-tolerant polyacrylamide and application thereof in oil displacement, belonging to the field of materials.
Background
Polyacrylamide (PAM) is a generic name for acrylamide homopolymers or polymers obtained by copolymerizing acrylamide with other monomers, and is one of the most widely used species of water-soluble polymers. Polyacrylamide is a kind of multifunctional oil field chemical treating agent, and is widely used in the drilling, cementing, well completion, well repair, fracturing, acidification, water injection, water shutoff and profile control of oil exploitation, and tertiary oil recovery operation processes, especially in the fields of drilling, water shutoff and profile control and tertiary oil recovery. The polyacrylamide aqueous solution has higher viscosity, has better thickening, flocculating and rheological control effects, and is used as an oil displacement agent and a drilling mud regulator in oil exploitation. In the middle and later stages of oil exploitation, in order to improve the recovery ratio of crude oil, polymer flooding and ternary complex flooding technologies are mainly popularized in China at present. By injecting the polyacrylamide aqueous solution, the oil-water flow rate ratio is improved, so that the crude oil content in the produced substance is increased. The polyacrylamide is added in the tertiary oil recovery, so that the oil displacement capability can be improved, the oil layer is prevented from being punctured, and the recovery rate of an oil bed is improved. The petroleum industry in China is the largest user of polyacrylamide, the development of the petroleum industry in China is promoted by the technological progress of polyacrylamide, and the development of the technological innovation pace and industry of polyacrylamide is accelerated by the demand of the petroleum industry.
In order to solve the problem that the traditional polyacrylamide has poor temperature resistance and salt tolerance, the polymer is suitable for oil reservoirs in a wider range, and the research on the temperature resistance and salt tolerance polyacrylamide is gradually valued by scholars at home and abroad, and corresponding progress is made. The temperature-resistant and salt-resistant polymers are classified into 5 types, namely amphoteric polymers, temperature-resistant and salt-resistant monomer copolymers, hydrophobically associating polymers, multicomponent combined copolymers and comb polymers.
(1) Amphoteric polymer: the amphoteric polymer refers to a polymer having both negative and positive groups on the molecular chain. The electrostatic interaction of the amphoteric polymers may be expressed as repulsive force or attractive force according to the deviation of the solution from the state of the isoelectric point. According to the studies of the amphoteric copolymer by the scenic peaks and the like, it was found that when the amphoteric polymer is not in the isoelectric point state, the molecular chain thereof has a large electrostatic charge, so that the amphoteric polymer solution is similar to the anionic or cationic polyelectrolyte and the molecular chain exhibits an expanded state. When the amphoteric polymer is near the isoelectric point, polymer molecular chains shrink under a solution with low mineralization degree due to inner salt formed by polymer chain links with opposite charges; in the solution with high mineralization degree, the internal salt bond is destroyed, the hydrodynamic volume of the polymer molecular chain is gradually increased along with the improvement of the mineralization degree, the viscosity is improved along with the increase of the mineralization degree, and the salt resistance is obvious. Compared with partially hydrolyzed polyacrylamide, the amphoteric polyacrylamide can effectively improve the recovery ratio during oil extraction, but the amphoteric polymer has poor solubility and the amphoteric polymer solution is easy to age, and the number of charges on molecular chains is unequal along with the extension of the storage time, so that the curling degree of the molecular chains is increased along with the increase of the mineralization degree of the solution, and the viscosity of the solution is greatly reduced. And the cationic group of the amphoteric polymer can cause a great amount of polymer solution to be adsorbed in the near-wellbore area of an oil field, so that the oil recovery efficiency is influenced by the increased oil recovery cost, and the amphoteric polymer is not considered to be suitable for tertiary oil recovery.
(2) Salt-tolerant monomeric polymer: the salt-tolerant monomer polymer is a temperature-resistant salt-tolerant polymer which is obtained by copolymerizing acrylamide and one or more temperature-resistant salt-tolerant monomers and does not react with calcium and magnesium ions to generate precipitation. The temperature-resistant and salt-tolerant monomer refers to a monomer which does not have a precipitation reaction with calcium and magnesium ions and is slowly hydrolyzed at high temperature, such as 2-acrylamido-2-methyl sodium propanesulfonate, N-vinylamide, N-vinylpyrrolidone and the like. The viscosity of the salt-tolerant monomer polymer in the salt water is reduced along with the increase of the hydrolysis degree of the polymer, so that the temperature-resistant salt-tolerant monomer accounts for 20 to 60 percent of the content of the polymer by changing according to different oil field environments (temperatures), and the polymer can resist temperature and salt for a long time. However, the method has high cost and is difficult to be applied to tertiary oil recovery in oil fields on a large scale.
(3) Hydrophobically associative polymer: hydrophobically associating polymers refer to water soluble polymers with a small number of hydrophobic groups on the polymer chain. Hydrophobic groups in hydrophobic polymers aggregate in aqueous solutions, causing intramolecular and intermolecular associations in the polymer. When the concentration of the polymer is low, intramolecular polymerization mainly occurs to curl the macromolecular chains of the polymer and reduce the viscosity, but when the concentration of the polymer reaches critical concentration, the intramolecular polymerization is converted into intermolecular polymerization to form a supermolecular structure, the hydrodynamic volume is increased, and the viscosity of the solution is greatly increased. The polarity of the solution can be increased after the salt is added or the temperature is increased, so that the hydrophobic association effect in the solution is enhanced, but under the action of high shear, a hydrophobic association network structure formed in the polymer is destroyed, the viscosity of the solution is reduced, the hydrophobic association effect of the polymer is regenerated when the shear effect disappears, and the viscosity is recovered again. The hydrophobic polymer has the characteristic of high economy, and can be synthesized into a temperature-resistant and salt-tolerant polymer by adopting a small amount of hydrophobic monomers, so that the research on the hydrophobic associated polymer becomes a hot topic in recent years.
(4) Multicomponent polymer:
the multicomponent combined polymer is a polymer obtained by respectively copolymerizing an anionic monomer, a cationic monomer, a temperature-resistant salt-tolerant monomer and a hydrophobic association monomer by comprehensively considering the characteristics of an amphoteric polymer, the temperature-resistant salt-tolerant polymer and the hydrophobic association polymer. Is a hot research direction at home and abroad.
(5) Comb-shaped compound: the comb-shaped compound is formed by copolymerizing an oleophilic group and a hydrophilic group on a macromolecular side chain, and the macromolecular chain is arranged into a comb shape in an aqueous solution due to mutual repulsion of the oleophilic and hydrophilic groups. The research history of the comb-shaped compound is short, the initial research aims to solve the problem that the high molecular surfactant is not easy to adsorb and arrange on the surface of the polymer, and people like Wangyupu, Luojiahui and the like firstly use the concept of the comb-shaped polymer in tertiary oil recovery. The comb-shaped polymer has similar temperature resistance and salt tolerance with the common hydrophobic polymer, and the viscosity value of the comb-shaped polymer is very low under the conditions of high temperature and high salt.
In combination with the conditions of practical application, among the five polymers, the hydrophobic association type polymer has the characteristics of temperature resistance and salt tolerance, and is low in economic cost, so that the hydrophobic association type polymer is a research hotspot in recent years.
The polyacrylamide copolymerization synthesis process is relatively complex, and mainly comprises the following methods:
the copolymerization method mainly comprises heterogeneous copolymerization, homogeneous copolymerization, micelle copolymerization and reversed-phase microemulsion polymerization.
(1) Heterogeneous copolymerization: the heterogeneous copolymerization method is a method in which an oil-soluble monomer and a water-soluble monomer are added to water so that the oil-soluble monomer exists in a dispersed state, and since the oil-soluble monomer and the water-soluble monomer are not mutually soluble, the copolymerization reaction is a heterogeneous process.
(2) Homogeneous copolymerization: the homogeneous copolymerization method is named because the oil-soluble monomer and the water-soluble monomer can be jointly dissolved in one solvent, and the copolymerization process is a homogeneous process. The hydrophobic monomer with the cation of quaternary ammonium salt type and containing sulfonic group can be polymerized with acrylamide by the method.
(3) Micelle copolymerization, namely a method for adding a surfactant into water to dissolve a hydrophobic monomer and then copolymerizing the monomer dissolved by the surfactant and a water-soluble monomer, and is a common method for preparing temperature-resistant and salt-resistant hydrophobically-associated polyacrylamide. Micellar copolymerization is inherently a heterogeneous process, and the process of such copolymerization is actually a micro heterogeneous process. Micelle copolymerization can effectively prepare temperature-resistant and salt-resistant polymers.
(4) Microemulsion polymerization: microemulsions are clear and thermodynamically stable oil-water dispersions formed from water, surfactant and co-surfactant. The microemulsion polymerization method is a method of adding a hydrophobic monomer and an acrylamide monomer to a microemulsion for polymerization. Compared with the traditional polyacrylamide, the copolymer has more excellent temperature resistance and salt tolerance. The inverse microemulsion polymerization is the polymerization initiated by oil soluble or water soluble initiator, in which oil soluble monomer and water soluble monomer are reacted with water-in-oil emulsifier and organic matter is used as continuous phase to form W/O microemulsion. Compared with micelle polymerization, the method can generate obvious tackifying effect when the content of the oil-soluble monomer is lower, and the hydrophobic monomers of the polymer chain are randomly distributed, so that the salt resistance and the heat resistance are stronger.
With the development of petroleum, the oil field environment is gradually complicated, and enhanced oil recovery (EOR technology) is beginning to develop, which is mainly divided into heat recovery, gas injection and chemical injection. Polymer flooding is one of the important technologies for enhanced oil recovery in current chemical injection processes. With the continuous development of chemical flooding technology, the application of the polymer in the field of crude oil extraction is more and more extensive. In general, polymers can increase oil recovery by increasing swept volume and improving the water-to-oil mobility ratio, and polymer flooding has been successful in many oil fields to date. However, in recent years, as exploration is developed towards the direction of low, deep and difficult (low permeability, deep well and complex high difficulty), oil exploitation is also developed towards the direction of two high and one difficult (high temperature, high salinity and low permeability), and the polymer solution is sensitive to the abnormality of temperature and salinity, so that the possibility of the polymer solution in the application of high-temperature and high-salinity oil reservoirs is limited, and higher economic and technical requirements are also provided for the oil displacement polymer.
Disclosure of Invention
According to one aspect of the application, the temperature-resistant salt-tolerant copolymer is provided, the influence of temperature-resistant salt-tolerant monomers and hydrophobic monomers on the copolymer is considered at the same time, acrylamide, the temperature-resistant salt-tolerant monomers and the quaternary ammonium salt hydrophobic monomers are subjected to homogeneous copolymerization in a water phase, a novel acrylamide water-soluble polymer is synthesized, and the influence of different reaction conditions on the solubility and viscosity of the polymer is mainly researched. The molecules of the water-soluble hydrophobic association polymer contain a large amount of hydrophilic groups and a small amount of hydrophobic groups, and the water-soluble hydrophobic association polymer has unique solution performances such as thickening property, shearing resistance, temperature resistance, salt resistance and the like. However, in the flooding process using polymers, it was found that the loss of solution viscosity from the formulation to the injection into the reservoir is significant and that biodegradation is a very important factor in addition to the viscosity reduction caused by mechanical shear and chemical degradation. The solution containing quaternary phosphonium salt ions has excellent bactericidal property, so that the quaternary ammonium type water-soluble hydrophobic association polymer obtained by copolymerizing the quaternary ammonium type cationic polymerizable surfactant, acrylamide and the temperature-resistant and salt-tolerant monomer may have more excellent performance.
The monomer of the temperature-resistant salt-tolerant copolymer comprises compounds shown in a formula I, a formula II and a formula III;
wherein R is 1 is-OH or-NH 2 ；
R 2 、R 3 Independently selected from H or C 1 -C 10 Alkyl groups of (a);
R 4 、R 5 、R 6 independently selected from H or C 5 -C 30 Alkyl groups of (a);
x is selected from halogen elements.
Alternatively, R 2 、R 3 Independently selected from C 1 -C 10 Alkyl group of (1).
Alternatively, R 2 、R 3 Independently selected from C 1 -C 5 Alkyl group of (1).
Alternatively, R 4 、R 5 、R 6 Independently selected from C 5 -C 30 Alkyl group of (1).
Alternatively, R 4 、R 5 、R 6 Independently selected from C 10 -C 30 Alkyl group of (1).
Alternatively, R 4 、R 5 、R 6 Is independently selected from C 10 -C 20 Alkyl group of (1).
Alternatively, X is selected from fluorine, chlorine, bromine, iodine.
Alternatively, X is selected from fluorine, chlorine, bromine.
Optionally, the temperature-resistant salt-tolerant copolymer has a basic viscosity of 11-28CP at 62 ℃ in an aqueous solution with a solid content of 18-25 wt%.
Optionally, the temperature-resistant salt-tolerant copolymer is prepared into 10000ppm solution by using 25000ppm of salinity saline water, and the dissolution time of the solution is less than 2 h.
Optionally, the temperature-resistant salt-tolerant copolymer is prepared into 10000ppm solution by using 25000ppm of saline water with mineralization degree, and the basic viscosity of the solution at 62 ℃ is 6-40 CP;
wherein the saline water with the degree of mineralization of 25000ppm comprises NaCl and CaCl 2 ，Ca 2+ Was 1200 ppm.
Optionally, the monomer of the temperature and salt resistant copolymer comprises acrylamide, acrylic acid, and compounds shown in formula II and formula III.
Optionally, the mass ratio of acrylamide, acrylic acid and the compounds shown in the formulas II and III in the monomers of the temperature-resistant salt-tolerant copolymer is 75-85:7-17:5-11: 0.5-1.6;
optionally, the monomers of the temperature-resistant salt-tolerant copolymer comprise acrylamide, acrylic acid, sodium 2-acrylamido-2-methylpropanesulfonate and hexadecyl dimethyl allyl ammonium chloride.
According to another aspect of the invention, there is provided a method for preparing the temperature and salt resistant copolymer, which comprises the following steps:
and (2) placing the reaction solution containing the monomer of the temperature-resistant salt-tolerant copolymer and the additive into a reaction vessel, and adding an initiator to carry out copolymerization reaction when the oxygen content in the reaction vessel is controlled to be not higher than 0.08mg/L to obtain the temperature-resistant salt-tolerant copolymer.
Optionally, the solid content of the monomers of the temperature and salt resistant copolymer in the reaction solution is 18-25%.
Optionally, the initiator is selected from at least one of potassium persulfate, sodium bisulfite, and azobisisobutyronitrile.
Optionally, the amount of the initiator is 0.01-0.5% of the mass of the copolymer monomer.
Optionally, the additive is selected from at least one of urea and disodium ethylene diamine tetraacetate.
Optionally, the additive is used in an amount of 1% to 1% of the total mass of the monomers of the copolymer.
Optionally, the reaction solution is an aqueous solution.
Optionally, the pH of the reaction solution containing the copolymer monomer and the additive is adjusted to 5 to 8.
Optionally, the temperature of the copolymerization reaction is 5-18 ℃, and the time of the copolymerization reaction is 2-4 hours.
Optionally, the monomers of the temperature-resistant salt-tolerant copolymer comprise acrylamide, acrylic acid, sodium 2-acrylamido-2-methylpropanesulfonate and hexadecyl dimethyl allyl ammonium chloride.
Alternatively, the solid content of sodium 2-acrylamido-2-methylpropanesulfonate in the reaction solution is 5 to 10%, the solid content of cetyldimethylallylammonium chloride in the reaction solution is 0.5 to 1.5%, and the solid content of acrylic acid in the reaction solution is 10 to 20%.
According to another aspect of the invention, the polymer for oil displacement contains at least one of the temperature-resistant salt-tolerant copolymer and the temperature-resistant salt-tolerant copolymer prepared by the preparation method. The hydrophobic association water-soluble polymer has a small amount of hydrophobic groups on a hydrophilic macromolecular chain, so that the polymer has rheological property completely different from that of a common polymer, and meanwhile, the temperature resistance and salt tolerance of the polymer are greatly improved, and the polymer has great application value in the field of oilfield exploitation.
According to another aspect of the invention, the application of the polymer for oil displacement and the tackifier in oil displacement is provided.
Optionally, the adhesion promoter comprises a graphene oxide-modified polyamide-based polymer. The hydrophobic association water-soluble polymer can still retain higher and stable viscosity under the action of the polymer and GO-Pam at high temperature and high salinity, and the application of the hydrophobic association water-soluble polymer in a high-temperature and high-salinity oil reservoir is expanded. The situation that the polymer has low viscosity and is unstable under high calcium and magnesium caused by the inconvenience of the main chain structure of the polymer molecule is improved. The polymer solves the technical problems that the viscosity of the polymer is seriously damaged under a high-calcium-magnesium oil reservoir and the thermal stability is poor in the prior art, and can improve the calcium-magnesium resistance of the polymer and improve the thermal stability of the polymer by utilizing the composite action of the polymer and GO-Pam.
Optionally, the polymer for oil displacement and the tackifier are applied to oil displacement with the calcium and magnesium concentration of more than 500 ppm;
preferably, the dosage of the tackifier is 0.1-1% of the total mass of the oil displacing polymer and the tackifier.
In the present application, "EDTA-2 Na" refers to disodium ethylenediaminetetraacetate.
"AIBN" refers to azobisisobutyronitrile.
"AMPS-Na" refers to sodium 2-acrylamido-2-methylpropanesulfonate.
"AM" refers to acrylamide.
"solid content" and "solid content" refer to the mass of the solid in the solution as a percentage of the total mass of the solution.
"base viscosity" refers to the initial viscosity of the polymer, i.e., the viscosity after viscosification without any additives.
The beneficial effect that this application can produce includes:
1) the synthesis method provided by the application improves the performance of the high-molecular polyacrylamide in a high-temperature and high-salt environment.
2) The method uses a homogeneous copolymerization method in a water phase, and is simpler and faster than a common heterogeneous copolymerization method and a micelle copolymerization method.
3) The reaction conditions are mild, and the method can be suitable for future possible pilot scale.
4) According to the temperature-resistant salt-tolerant copolymer provided by the application, the viscosity of the polymer in high-calcium magnesium salt water is increased by regulating the mixing ratio of the temperature-resistant salt-tolerant copolymer and Go-Pam (polyamide modified by graphene oxide).
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
Unless otherwise specified, the raw materials and catalysts in the examples of the present application were all purchased commercially.
Example 1 Synthesis procedure and evaluation method
The synthesis process comprises the following steps:
1) weighing the medicine: according to the experimental scheme, AM, acrylic acid, AMPS-Na, urea and EDTA-2Na are sequentially weighed in a clean 3L beaker, a certain amount of deionized water is added to fix the total mass of the system at 1200g, and the mixture is magnetically stirred until the mixture is dissolved;
2) hydrophobic monomer purification: weighing M16 in a rotary evaporation bottle, and performing rotary distillation on the rotary evaporation bottle to remove methanol in the rotary evaporation bottle;
3) adding the purified hydrophobic monomer into a batching beaker, and uniformly stirring;
4) adjusting the pH value of the system to a set value by using 2M sodium hydroxide solution, and testing by using a pH meter;
5) adjusting the temperature of the prepared raw materials to a set value in a water bath kettle;
6) transferring the raw material with the adjusted temperature into heat preservation equipment, and rinsing the raw material with deionized water for three times;
7) inserting the probe of the oxygen measuring instrument into the heat preservation equipment, inserting a nitrogen pipe, sealing, opening a nitrogen valve, and performing nitrogen blowing and oxygen removal;
8) when the oxygen content is below 0.4mg/L, cooling the system to a corresponding initial temperature, then adding an initiator, shaking up, and continuing to blow nitrogen;
9) when the oxygen content reaches 0.08mg/L, ending nitrogen blowing, inserting a thermometer, sealing and preserving heat, and monitoring the reading of the thermometer;
10) and when the temperature reaches the maximum value and is kept for a period of time, and when the temperature starts to obviously decrease, the reaction equipment is opened, the polymer (in the shape of a rubber block) after the reaction is taken out, and the synthesis experiment is finished.
11) Crushing the reacted polymer into small blocks by a crusher, drying by an oven, and then pulverizing by the crusher to obtain the powdery polymer solid.
The evaluation method comprises the following steps:
the polymer was mineralized using 25000ppm (composition NaCl and CaCl) 2 ，Ca 2+ 1200ppm) is prepared into 10000ppm solution to be dissolved for 2 hours, the solubility is checked, and no particles are obvious after 2 hours, which indicates complete dissolution. It was diluted to 1500ppm and tested for mineralization at 25000ppm (with Ca) using a rheometer 2+ 1200ppm) and a base viscosity at 62 ℃.
Example 2 varying the solids content
Table 1 change of solids content and base viscosity and solubility of the product
Other conditions were pH 7, reaction temperature 5 ℃, urea 2.4g, EDTA-2Na 0.08g, potassium persulfate 0.08g, sodium bisulfite 0.06g, AIBN0.06 g.
In the experiments we varied the solids content (18%, 20%, 22%), the AMPS-Na content (5%, 7.5%, 10% of solids), the M16 content (0.5%, 1%, 1.5% of solids), the acrylic acid content (10%, 15%, 20% of solids molar weight) respectively. Finally, the performance of the sample is optimal when the solid content is 22%, the AMPS-Na content is 7.5%, the M16 content is 1% and the acrylic acid content is 15%.
Example 3 changing the pH
Table 2 change of pH and base viscosity and solubility of the product
| pH | Reaction temperature/. degree.C | Base viscosity/cp | Solubility in water |
| 5 | 5 | / | / |
| 6 | 5 | 20 | >2h |
| 7 | 5 | 26 | <2h |
| 8 | 5 | 22 | <1.5h |
| 7 | 0 | / | / |
| 7 | 10 | 9.5 | <2h |
| 7 | 15 | 8 | <2h |
| 7 | 18 | 6 | <2h |
The other conditions were 22% of solid content, 201.96g of acrylamide, 30.36g of acrylic acid, 30.8 g of AMPS-Na19, M162.64g, 2.4g of urea, 0.08g of EDTA-2Na, 0.08g of potassium persulfate, 0.06g of sodium bisulfite, and 0.06g of AIBN0.
In the experiment, the pH value of the reaction (5, 6, 7 and 8) and the initial temperature of the reaction (0, 5, 10, 15 and 18) are respectively changed, and finally, the pH value of the reaction is 7, and the performance is optimal when the initial temperature of the reaction is 5 ℃.
Example 4 variation of initiator
TABLE 3 variation of the base viscosity and solubility of the initiator and product
The rest conditions are 22% of solid content, 201.96g of acrylamide, 30.36g of acrylic acid, 19.8g of AMPS-Na, 162.64g of M162.64g of urea, 0.08g of EDTA-2Na, pH 7 and reaction temperature 5 ℃.
In the experiment, the amounts of the initiators potassium persulfate, sodium bisulfite and AIBN are respectively changed, so that the reaction effect is optimal when 0.08g of potassium persulfate, 0.06g of sodium bisulfite and 0.06g of AIBN are added.
Example 5 Change of reactants
Table 4 change the base viscosity and solubility of the reactants and products
1) The M16 monomer was replaced with an equivalent amount of M18 (octadecyl dimethyl allyl ammonium chloride) monomer, and the remaining conditions were unchanged, resulting in a polymer dissolution time >3 h.
The M16 monomer was replaced with an equal amount of DTAP (cetyldimethylallylammonium chloride) and the remaining conditions were unchanged, resulting in a polymer dissolution time <2h and a base viscosity <20 cp.
Example 6 adhesion promoter
Dissolve 1500ppm polymer in 25000ppm high calcium magnesium saline condition, add 0.1% -1% Go-Pam (graphene oxide modified polyamide, see CN112111121B for details) to this solution, stir 15min-20min, test its viscosity at high temperature immediately. The test protocol is as follows:
watch four
| Numbering | Calcium magnesium concentration | Amount of Go-Pam | Time of stirring | Test temperature | Viscosity of the oil |
| 1 | 500ppm | 0.4％ | 20min | 60℃ | 82cp |
| 2 | 1500ppm | 0.4％ | 20min | 60℃ | 68cp |
| 3 | 2500ppm | 0.4％ | 20min | 60℃ | 55cp |
| 4 | 1500ppm | 0.2％ | 20min | 60℃ | 62cp |
| 5 | 1500ppm | 0.6％ | 20min | 60℃ | 63cp |
| 6 | 1500ppm | 0.8％ | 20min | 60℃ | 49cp |
| 7 | 1500ppm | 1％ | 20min | 60℃ | 26cp |
| 8 | 1500ppm | 0.4％ | 15min | 60℃ | 59cp |
| 9 | 1500ppm | 0.4％ | 20min | 70℃ | 49cp |
| 10 | 1500ppm | 0.4％ | 20min | 80℃ | 31cp |
Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.
Claims (10)
1. The temperature-resistant salt-tolerant copolymer is characterized in that a monomer of the temperature-resistant salt-tolerant copolymer comprises compounds shown in a formula I, a formula II and a formula III;
wherein R is 1 is-OH or-NH 2 ；
R 2 、R 3 Independently selected from H or C 1 -C 10 Alkyl groups of (a);
R 4 、R 5 、R 6 independently selected from H or C 5 -C 30 Alkyl groups of (a);
x is selected from halogen elements.
2. The temperature-resistant salt-tolerant copolymer of claim 1, wherein the temperature-resistant salt-tolerant copolymer is prepared by using 25000ppm of salinity saline water to prepare 10000ppm of solution, and the dissolution time of the solution is less than 2 hours;
preferably, 25000ppm of salinity saline water is used for preparing 10000ppm of solution from the temperature-resistant salt-tolerant copolymer, and the basic viscosity of the solution at 62 ℃ is 6-40 cp;
wherein the saline water with the degree of mineralization of 25000ppm comprises NaCl and CaCl 2 ，Ca 2+ Was 1200 ppm.
3. The temperature and salt resistant copolymer of claim 1, wherein the monomers of the temperature and salt resistant copolymer comprise acrylamide, acrylic acid, compounds of formula II and formula III;
preferably, the mass ratio of acrylamide to acrylic acid to the compounds shown in the formulas II and III in the monomers of the temperature-resistant salt-resistant copolymer is 75-85:7-17:5-11: 0.5-1.6;
preferably, the monomers of the temperature-resistant salt-tolerant copolymer comprise acrylamide, acrylic acid, sodium 2-acrylamido-2-methylpropanesulfonate and hexadecyl dimethyl allyl ammonium chloride.
4. The method for preparing the temperature and salt resistant copolymer according to any one of claims 1 to 3, which comprises the following steps:
and (2) placing the reaction solution containing the monomers of the temperature-resistant salt-tolerant copolymer and the additive into a reaction vessel, adding an initiator, and carrying out copolymerization reaction to obtain the temperature-resistant salt-tolerant copolymer.
5. The method for preparing the temperature-resistant and salt-tolerant copolymer according to claim 4, wherein the solid content of the monomer of the temperature-resistant and salt-tolerant copolymer in the reaction solution is 18-25%;
preferably, the initiator is selected from at least one of potassium persulfate, sodium bisulfite and azobisisobutyronitrile; preferably, the amount of the initiator is 0.01-0.5% of the mass of the copolymer monomer;
preferably, the additive is selected from at least one of urea and disodium ethylene diamine tetraacetate; preferably, the amount of the additive is 0.1 to 1 percent of the total mass of the monomers of the copolymer;
preferably, the reaction solution is an aqueous solution;
preferably, the pH of the reaction solution containing the copolymer monomer and the additive is adjusted to 5 to 8;
preferably, the temperature of the copolymerization reaction is 0 to 18 ℃, and the time of the copolymerization reaction is 2 to 4 hours.
6. The method for preparing the temperature and salt resistant copolymer according to claim 5,
the monomer of the temperature-resistant salt-tolerant copolymer comprises acrylamide, acrylic acid, 2-acrylamide-2-methyl sodium propane sulfonate and hexadecyl dimethyl allyl ammonium chloride;
preferably, the solid content of the sodium 2-acrylamido-2-methylpropanesulfonate in the reaction solution is 5 to 10%, the solid content of the cetyldimethylallylammonium chloride in the reaction solution is 0.5 to 1.5%, and the solid content of the acrylic acid in the reaction solution is 10 to 20%.
7. A polymer for oil displacement, which is characterized by comprising at least one of the temperature-resistant salt-tolerant copolymer of any one of claims 1 to 3 and the temperature-resistant salt-tolerant copolymer prepared by the preparation method of any one of claims 4 to 6.
8. The use of the flooding polymer of claim 7 with a viscosifier in flooding.
9. The use of claim 8, wherein the adhesion promoter comprises a graphene oxide-modified polyamide-based polymer.
10. The use of claim 8, wherein the use of the flooding polymer with a viscosifier is in flooding with calcium and magnesium concentrations greater than 500 ppm;
preferably, the dosage of the tackifier is 0.1-1% of the total mass of the oil displacing polymer and the tackifier.
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| CN104449637A (en) * | 2013-11-04 | 2015-03-25 | 郭保祥 | Semi-permeable membrane type profile-control and water-plugging oil-displacing agent and preparation method thereof |
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