CN104311755A - Salt-resistant polymer for oil displacement of oil field and preparation method thereof - Google Patents
Salt-resistant polymer for oil displacement of oil field and preparation method thereof Download PDFInfo
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- CN104311755A CN104311755A CN201410594266.3A CN201410594266A CN104311755A CN 104311755 A CN104311755 A CN 104311755A CN 201410594266 A CN201410594266 A CN 201410594266A CN 104311755 A CN104311755 A CN 104311755A
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Abstract
The invention discloses a salt-resistant polymer for oil displacement of an oil field and a preparation method thereof. The salt-resistant polymer comprises the following materials in parts by weight: 80-120 parts of acrylamide, 26-40 parts of acrylic acid, 1-5 parts of hydrophobic monomer, 1-5 parts of polyoxyethylene octadecanol ether methacrylate or polyoxyethylene hexadecanol ether methacrylate, 230-450 parts of deionized water and 0.1-0.3 part of chain transferring agent. The salt-resistant polymer and the preparation method disclosed by the invention have the advantages that in a formula of the polymer, since polyoxyethylene octadecanol ether methacrylate and the hydrophobic monomer are added for composite use, the salt resistance of the polymer is improved; in the formula of the polymer, polyoxyethylene octadecanol ether methacrylate is added, and a surface active agent does not need to be added in the synthesis process, so that the following treatment process is reduced; the viscosity retention rate of 1500ppm salt-resistant polymer solution is larger than 80% after the 1500ppm salt-resistant polymer solution is put in the solution with the degree of mineralization being 30000mg/L NaCl and 200mg/L Ca<2+> and Mg<2+>.
Description
Technical field
The present invention relates to technology of reservoir sweep field, oil field, particularly relate to a kind of salt-resistant polymer for the oil field displacement of reservoir oil and preparation method thereof.
Background technology
China starts the research of tertiary oil recovery technology the sixties, after the eighties, tertiary oil recovery technology obtains high speed development, China's oil reservoir major part is terrestrial lake basin deposition, formation condition is intricate, reservoir heterogeneity is serious, differs greatly between series of strata with layer intrinsic permeability, has the wide application prospect adapting to polymer flooding.
Conventional flooding polymers mainly partially hydrolyzed polyacrylamide and derivative thereof, the heat resistance of hydro-polyacrylamide is poor, under the high temperature conditions, obvious thermal-oxidative degradation and hydrolytic action can occur, soltion viscosity is reduced, and oil displacement efficiency is deteriorated; The salt resistant character of partially hydrolyzed polyacrylamide is poor, polyacrylamide has the quick effect of salt, and in high salinity particularly at the oil reservoir that high volence metal ion is high, its viscosity can significantly decline, even can produce precipitation, therefore partially hydrolyzed polyacrylamide is difficult to use sewage to be configured.
Polyacrylamide wetting ability is strong, and Yi Yushui forms hydrogen bond, soluble in water, there is after aquation larger ydrodynamics volume, but due to the flexible chain of molecular chain, show as random coil conformation in aqueous, in the salt solution of high temperature and high salinity, molecular chain occurs curling, viscosity significantly declines, and polymer viscosified effect is obviously deteriorated, and flexible chain is easy to mechano-degradation, make it apply and be subject to larger restriction, be not well positioned to meet the application of high temperature, high salinity.
Summary of the invention
The invention provides a kind of salt-resistant polymer for the oil field displacement of reservoir oil and preparation method thereof.
The present invention adopts following technical scheme:
Salt-resistant polymer for the oil field displacement of reservoir oil of the present invention is made up of the raw material of following weight part: acrylamide 80-120, vinylformic acid 26-40, hydrophobic monomer 1-5, polyoxyethylene octadecanol ether metacrylic acid ester or polyoxyethylene hexadecanol ether metacrylic acid ester 1-5, deionized water 230-450, chain-transfer agent 0.1-0.3.
Hydrophobic monomer is any one in methyl acrylate, ethyl propenoate, methyl methacrylate, β-dimethyl-aminoethylmethacrylate, Isooctyl acrylate monomer, Process Conditions of Cetane Acrylate or octadecyl acrylate.
Chain-transfer agent is sodium hypophosphite or Dodecyl Mercaptan.
The concrete steps of the preparation method of the salt-resistant polymer for the oil field displacement of reservoir oil of the present invention are as follows: be dissolved in 230-450 part deionized water by 80-120 part acrylamide and make the aqueous solution, add 26-40 part vinylformic acid, it is 8 that sodium hydroxide is neutralized to pH value, add 1-5 part hydrophobic monomer, 1-5 part polyoxyethylene octadecanol ether metacrylic acid ester or polyoxyethylene hexadecanol ether metacrylic acid ester, 0.1-0.3 part chain-transfer agent, proceed to after stirring in reactor, logical nitrogen 30min adds 1# initiator 0.015-0.035 part, continue logical nitrogen 10min and add 2# initiator 0.01-0.03 part, logical nitrogen 10min adds 3# initiator 0.01-0.03 part ppm, continue logical nitrogen until reaction system has 1-2 DEG C of intensification, stop logical nitrogen, question response system is warming up to peak temperature, temperature is between 80-95 DEG C, reactor is transferred to constant temperature in 90 DEG C of baking ovens and is hydrolyzed 4 hours, then 5 hours are incubated, cutting, granulation, dry, pulverizing obtains salt-resistant polymer of the present invention.
Described 1# initiator is any one in Diisopropyl azodicarboxylate, 2,2'-Azobis(2,4-dimethylvaleronitrile) or azo diisobutyl amidine hydrochloride.
Described 2# initiator is any one in ammonium persulphate, Potassium Persulphate or Sodium Persulfate.
Described 3# initiator is any one in sodium bisulfite, Sulfothiorine or trolamine.
Positively effect of the present invention is as follows:
Of the present invention for adding polyoxyethylene octadecanol ether metacrylic acid ester in the salt-resistant polymer formula of the oil field displacement of reservoir oil, improve the salt resistance of polymkeric substance with hydrophobic monomer compound use;
Of the present invention for adding polyoxyethylene octadecanol ether metacrylic acid ester in the salt-resistant polymer formula of the oil field displacement of reservoir oil, do not need in building-up process to add tensio-active agent, decrease subsequent processes;
The 1500ppm salt-resistant polymer solution for the oil field displacement of reservoir oil of the present invention is 30000mg/LNaCl, 200mg/LCa in salinity
2+, Mg
2+in solution, 90d viscosity retention ratio is greater than 80%.
Embodiment
The following examples describe in further detail of the present invention.
Embodiment 1
Raw material composition (weight part) of 1.1 salt-resistant polymers for the oil field displacement of reservoir oil of the present invention:
The preparation method of 1.2 salt-resistant polymers for the oil field displacement of reservoir oil of the present invention:
Acrylamide is dissolved in deionized water and makes the aqueous solution, add vinylformic acid, it is 8 that sodium hydroxide is neutralized to pH value, add hydrophobic monomer, polyoxyethylene octadecanol ether metacrylic acid ester or polyoxyethylene hexadecanol ether metacrylic acid ester, chain-transfer agent, proceed to after stirring in reactor, logical nitrogen 30min adds 1# initiator, continue logical nitrogen 10min and add 2# initiator, logical nitrogen 10min adds 3# initiator, continue logical nitrogen until reaction system has 1-2 DEG C of intensification, stop logical nitrogen, question response system is warming up to peak temperature, temperature is between 80-95 DEG C, reactor is transferred to constant temperature in 90 DEG C of baking ovens and is hydrolyzed 4 hours, rear insulation 5 hours, cutting, granulation, dry, pulverizing obtains salt-resistant polymer of the present invention.
Embodiment 2
Raw material composition (weight part) of 2.1 salt-resistant polymers for the oil field displacement of reservoir oil of the present invention:
The preparation method of 2.2 salt-resistant polymers for the oil field displacement of reservoir oil of the present invention:
With 1.2 of embodiment 1.
Embodiment 3
Raw material composition (weight part) of 3.1 salt-resistant polymers for the oil field displacement of reservoir oil of the present invention:
The preparation method of 3.2 salt-resistant polymers for the oil field displacement of reservoir oil of the present invention:
With 1.2 of embodiment 1.
The polymer mother liquor simulated sewage prepared by 5000mg/L embodiment 1-3 is diluted to 1000mg/L solution (simulated sewage: 10000mg/LNaCl, 200mg/L (Ca
2+, Mg
2+)).Result is as shown in table 1.
Table 1
| ? | Blank | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Just sticky, mpa.s | 17.8 | 50.2 | 51.8 | 49.6 |
| 90d viscosity, mpa.s | 4.6 | 45.6 | 45.8 | 44.8 |
| Viscosity retention ratio, % | 25.84 | 90.83 | 88.42 | 90.32 |
The 1500ppm salt-resistant polymer solution for the oil field displacement of reservoir oil of the present invention is 30000mg/LNaCl, 200mg/LCa in salinity as can be seen from Table 1
2+, Mg
2+in solution, 90d viscosity retention ratio is greater than 80%.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalents thereof.
Claims (8)
1. for a salt-resistant polymer for the oil field displacement of reservoir oil, it is characterized in that: described salt-resistant polymer is made up of the raw material of following weight part: acrylamide 80-120, vinylformic acid 26-40, hydrophobic monomer 1-5, polyoxyethylene octadecanol ether metacrylic acid ester or polyoxyethylene hexadecanol ether metacrylic acid ester 1-5, deionized water 230-450, chain-transfer agent 0.1-0.3.
2., as claimed in claim 1 for the salt-resistant polymer of the oil field displacement of reservoir oil, it is characterized in that: hydrophobic monomer is any one in methyl acrylate, ethyl propenoate, methyl methacrylate, β-dimethyl-aminoethylmethacrylate, Isooctyl acrylate monomer, Process Conditions of Cetane Acrylate or octadecyl acrylate.
3., as claimed in claim 1 for the salt-resistant polymer of the oil field displacement of reservoir oil, it is characterized in that: chain-transfer agent is sodium hypophosphite or Dodecyl Mercaptan.
4. prepare the method for the salt-resistant polymer for the oil field displacement of reservoir oil as described in any one of claim 1-3 for one kind, it is characterized in that: the concrete steps of described method are as follows: 80-120 part acrylamide is dissolved in 230-450 part deionized water and makes the aqueous solution, add 26-40 part vinylformic acid, it is 8 that sodium hydroxide is neutralized to pH value, add 1-5 part hydrophobic monomer, 1-5 part polyoxyethylene octadecanol ether metacrylic acid ester or polyoxyethylene hexadecanol ether metacrylic acid ester, 0.1-0.3 part chain-transfer agent, proceed to after stirring in reactor, logical nitrogen 30min adds 1# initiator 0.015-0.035 part, continue logical nitrogen 10min and add 2# initiator 0.01-0.03 part, logical nitrogen 10min adds 3# initiator 0.01-0.03 part ppm, continue logical nitrogen until reaction system has 1-2 DEG C of intensification, stop logical nitrogen, question response system is warming up to peak temperature, reactor is transferred to constant temperature in 90 DEG C of baking ovens and is hydrolyzed 4 hours, then 5 hours are incubated, cutting, granulation, dry, pulverizing obtains salt-resistant polymer of the present invention.
5. method as claimed in claim 4, is characterized in that: described 1# initiator is any one in Diisopropyl azodicarboxylate, 2,2'-Azobis(2,4-dimethylvaleronitrile) or azo diisobutyl amidine hydrochloride.
6. method as claimed in claim 4, is characterized in that: described 2# initiator is any one in ammonium persulphate, Potassium Persulphate or Sodium Persulfate.
7. method as claimed in claim 4, is characterized in that: described 3# initiator is any one in sodium bisulfite, Sulfothiorine or trolamine.
8. method as claimed in claim 4, is characterized in that: described peak temperature is 80-95 DEG C.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104610083A (en) * | 2015-02-06 | 2015-05-13 | 西南石油大学 | Resin framework monomer taking 2,4-diacetyl-3-(4-bromophenyl)ethyl glutarate as core as well as preparation method and application of resin framework monomer |
| CN106084144A (en) * | 2016-05-31 | 2016-11-09 | 四川大学 | Based on polyether graft modified hot adhesion-promoting polymer and preparation method thereof |
| CN113667072A (en) * | 2021-08-31 | 2021-11-19 | 西南石油大学 | Preparation method and application of salt-tolerant hydrophobic polymer |
| US11220624B2 (en) | 2018-07-30 | 2022-01-11 | Championx Usa Inc. | Salt-tolerant, fast-dissolving, water-soluble rheology modifiers |
| US11332563B2 (en) | 2018-07-30 | 2022-05-17 | Ecolab Usa Inc. | Fast dissolving, water soluble, hydrophobically-modified polyelectrolytes |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104610083A (en) * | 2015-02-06 | 2015-05-13 | 西南石油大学 | Resin framework monomer taking 2,4-diacetyl-3-(4-bromophenyl)ethyl glutarate as core as well as preparation method and application of resin framework monomer |
| CN104610083B (en) * | 2015-02-06 | 2016-05-04 | 西南石油大学 | Branch skeleton monomer that one is core with 2,4-diacetyl-3-(4-bromophenyl) ethyl glutarate and preparation method thereof and application |
| CN106084144A (en) * | 2016-05-31 | 2016-11-09 | 四川大学 | Based on polyether graft modified hot adhesion-promoting polymer and preparation method thereof |
| US11220624B2 (en) | 2018-07-30 | 2022-01-11 | Championx Usa Inc. | Salt-tolerant, fast-dissolving, water-soluble rheology modifiers |
| US11332563B2 (en) | 2018-07-30 | 2022-05-17 | Ecolab Usa Inc. | Fast dissolving, water soluble, hydrophobically-modified polyelectrolytes |
| CN113667072A (en) * | 2021-08-31 | 2021-11-19 | 西南石油大学 | Preparation method and application of salt-tolerant hydrophobic polymer |
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Application publication date: 20150128 |