CN1405266A - Method for preparing oil-displacing agent of high-tack-producing hydrophobic association polymer - Google Patents
Method for preparing oil-displacing agent of high-tack-producing hydrophobic association polymer Download PDFInfo
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Abstract
There is a method of high stickly thick water association polymer degreaser, its character is that the propylene acyl (AM)-natrium acrylate (NaAA)-N-p-butyl benzene propylene acyl (BPAM) thick water association water soluble polymer is confected into 0.1-0.3 wt% thickness, the thickness of surface active agent is 0.01-1 mmol/liter and the thickness of NaCL is 0.5-1.5 wt5, they are added into blending pot which has blender and thermometer, they are blended under 25-40 degree C equably, the degreaser is got.
Description
One, technical field
The present invention relates to a kind of preparation method of high tackify hydrophobic associated polymer oil-displacing agent, belong to the Polymer Synthesizing field.
Two, background technology
Hydrophobic associated water-soluble polymer is meant a class water-soluble polymers that has a small amount of hydrophobic grouping on polymkeric substance wetting ability macromolecular chain.Because its unique tackify, anti-salt, SOLUTION PROPERTIES such as anti-shearing, as novel polymeric oil-displacing agent be applied to high salt, the high-shear oil reservoir development has a good application prospect.Chinese scholars is to structure, character, the tackify mechanism of hydrophobic associated water-soluble polymer and should be used as big quantity research, exploration work.
The Industrial products that are usually used in strengthening the polymer flooding of oil production (EOR) at present only have partially hydrolyzed polyacrylamide (PAM), and it depends on the repulsive interaction of ion on high molecular and the polymer molecular chain and strong polarity side group and reaches the tackify effect.But high-molecular weight polymer is easy to take place mechano-degradation and loses viscosity when being subjected to bigger stretching and shear-stress, and is particularly evident during injection of polymer in the low permeability rock stratum.Positively charged ion in the aqueous solution, especially divalent ion, the ionic group in the meeting shielded polymer curls polymer molecular chain, and hydrodynamic volume reduces even precipitates, thereby tackifying is reduced greatly.When depth of stratum reaches 20000 feet, reservoir temperature higher (about 100 ℃), the facile hydrolysis in high-temperature water solution of the amide group in the polyacrylamide (PAM) sharply descends the salt resistance of polymers soln.U.S.Pat.5,071,934 has described and has contained different carbon alkyl chain length cation-type hydrophobic association water-soluble polymerss, and the method for their available routines is synthetic, but shows and the remarkable different rheological property of traditional polyelectrolyte.Guo Yongjun etc., applied chemistry, 16 (6), 56-58 has synthesized acrylamide (AM)-sodium acrylate (NaAA)-octadecyl dimethyl-allyl ammonia chloride (C
18DMAAC) hydrophobic associating water-soluble copolymer has been studied the influence of Sodium dodecylbenzene sulfonate (SDBS) to copolymer solution character, and gained copolymer solution critical association concentration is 0.5wt%.Because hydrophobic associated water-soluble polymer critical association concentration is higher, not high than viscosity under the low copolymer concentration, thereby limited application.
Three, summary of the invention
The objective of the invention is to provide a kind of preparation method of high tackify hydrophobic associated polymer oil-displacing agent at the deficiencies in the prior art, be characterized in the hydrophobic associated water-soluble polymer macromole, introducing negatively charged ion the 3rd modular construction, and, obtain high tackify hydrophobic associated water-soluble polymer oil-displacing agent by interacting strongly with the surfactant molecule functional group.
The present inventor finds, adopt free radical micella copolymerization method synthesis of acrylamide (AM)-sodium acrylate (NaAA)-N-that butyl phenyl acrylamide (BPAM) hydrophobic associated water-soluble polymer (is called for short: AM-NaAA-BPAM), anionic monomer and surfactant concentration have considerable influence to resulting polymers structure and solution behavior in the polyreaction, and adding an amount of negatively charged ion the 3rd monomer can increase polymer water dissolubility, surfactivity and performance and the collaborative thickening property of functional monomer; Suitable surfactant concentration can obtain to have suitable hydrophobic group block length, have the strong hydrophobic association effect and the hydrophobic associated polymer of good aqueous solubility concurrently.The adding of tensio-active agent increases substantially AM-NaAA-BPAM hydrophobic associating water-soluble copolymer soltion viscosity.Near tensio-active agent micelle-forming concentration (CMC), polymkeric substance/surfactant system viscosity reaches maximum.This is to have formed mixed micelle because tensio-active agent hydrophobic group and polymer hydrophobic side chain twine mutually, different main polymer chains produce crosslinked by forming mixed micelle between the hydrophobic group on its side chain, thereby form denser, fairly large spacial framework, cause system viscosity sharply to rise.When surfactant concentration was too high, the surfactant micelle that forms in the solution was too much, can not be effectively that polymer molecule and hydrophobic group entanglement is crosslinked, thus associate between the saboteur, cause system viscosity to reduce.For anion surfactant, it has like charges with polymer chain, repels mutually and weakens association.Cats product and copolymer molecule have the xenogenesis electric charge and attract each other, and help tangling crosslinked with polymer molecule.But when surfactant concentration was too high, strong association took place and produces gel in cats product and electronegative copolymer molecule, thus with moisture mutually.Nonionogenic tenside is with only there being hydrophobic group to interact between polymer molecule.
Purpose of the present invention is realized that by following technical measures wherein said raw material mark is parts by weight except that specified otherwise.
The preparation method of high tackify hydrophobic associated polymer oil-displacing agent
1. the preparation of hydrophobic associated polymer
With acrylamide 35-94.5 part, sodium acrylate 5-60 part, N-is to butyl phenyl acrylamide 0.3-3 part, and tensio-active agent 5-300 part, deionized water 500-3333 part add in the three-necked bottle, regulator solution PH=9-10, in temperature 30-60 ℃, logical N
2Gas adds persulfate initiator 0.01-1 part after 30 minutes, reacted 12 hours, the copolymerization product dilute with water is used acetone precipitation, washing again, vacuum-drying obtains white powdered acrylic amide-acrylic sodium-N-to butyl phenyl acrylamide (AM-NaAA-BPAM) polymkeric substance.
Wherein persulfate initiator is a Potassium Persulphate, a kind of in Sodium Persulfate and/or the ammonium persulphate etc.
2. the preparation of hydrophobic associated polymer oil-displacing agent
It is 0.1-0.3wt% that acrylamide (AM)-sodium acrylate (NaAA) N-is made into polymer concentration to butyl phenyl acrylamide (BPAM) hydrophobic associated water-soluble polymer, surfactant concentration be 0.01-1 rub in the least/liter, NaCl concentration is the solution of 0.5-1.5wt%, add and have in the mixing tank of agitator and thermometer, be 25-40 ℃ in temperature and stir, obtain high tackify hydrophobic associated water-soluble polymer oil-displacing agent.
Wherein tensio-active agent contains: anion surfactant is C
8-16Sodium alkyl benzene sulfonate, C
8-16Sodium alkyl sulfate etc.; Cats product is C
8-16Alkyl trimethyl ammonium bromide etc.; Nonionogenic tenside is C
8-16The alkyl dimethyl ammonium oxide, C
8-16Alkyl polyoxyethylene ether etc.
AM-NaAA-BPAM polymer oil-displacing agent performance
The relation of AM-NaAA-BPAM polymers soln apparent viscosity and concentration is shown in Fig. 1 and table 1.The result shows that hydrophobic associated water-soluble polymer AM-NaAA-BPAM has lower critical association concentration and higher tackifying.
Anionic concentration to the influence of polymers soln apparent viscosity as shown in Figure 2.The result shows that the adding of anion surfactant has considerable influence to the tackifying of hydrophobic associated water-soluble polymer, and is little to non-hydrophobic associated water-soluble polymer influence; And near the tensio-active agent micelle-forming concentration, polymeric system reaches ultimate viscosity number.
Shearing action to the influence of hydrophobic associated water-soluble polymer apparent viscosity as shown in Figure 3.The result shows that the formed intermolecular physical cross-linked network of this system is disengaged viscosity degradation under shearing action; After shearing action was removed, this intermolecular entanglement formed viscosity recovery again.Thereby produce intermolecular association and conciliate associating running balance.
The relation of polymer elasticity modulus (G ') and viscous modulus (G ") and oscillation frequency as shown in Figure 4.The result shows that this polymeric acceptor ties up in the surge frequency range of being investigated, and Young's modulus demonstrates the fluid based on elasticity greater than viscous modulus.
The present invention has following advantage:
The present invention is to ionic, synthesizing of both sexes hydrophobic associated water-soluble polymer and hydrophobically modified polyelectrolyte, carry out extensively structural characterization and SOLUTION PROPERTIES aspect, on the deep research basis, by in the hydrophobic associated polymer macromole, introducing negatively charged ion the 3rd modular construction, to increase the water-soluble of polymkeric substance, surfactivity and performance and functional monomer are worked in coordination with the tackify effect, and it is it is compound with surfactant molecule, by polymer molecule with the surfactant molecule hydrophobic group, radical ion interacts, the proper concn surfactant micelle tangles to hydrophobic group between polymer molecule, association waits the physical crosslinking effect, makes the network-like structure of polymer molecule formation gel and shows high tackifying.Surfactant molecule also has compatibilization to the gel that the polymer macromolecule hydrophobic group tangle to form, thereby improved the water-soluble of the stronger polymkeric substance of association, makes it to show high tackifying, obtains high tackify hydrophobic associated water-soluble polymer system.The P that is developed (AM-NaAA-BPAM) hydrophobic associated water-soluble polymer, under suitable surfactant concentration, when polymer concentration is 0.15wt%, NaCl concentration is 1.5wt%, at 25 ℃ and 6s
-1Down, its viscosity is up to 855mPa.s, and when polymer concentration is 0.2wt%, its viscosity is up to 1989mPa.s.Compare with the result of study (＜250mPa.s (same test condition)) of reported in literature, this polymer viscosified is significantly increased.
Four, description of drawings
The relation of Fig. 1 copolymer solution apparent viscosity and concentration
Fig. 2 sodium lauryl sulphate concentration is to the influence of copolymer solution apparent viscosity
Fig. 3 shearing rate is to the influence of AM-NaAA-BPAM polymers soln apparent viscosity
The relation of Fig. 4 AM-NaAA-BPAM polymer elasticity modulus (G ') and viscous modulus (G ") and oscillation frequency
Five, embodiment
Below by embodiment the present invention is carried out concrete description; be necessary to be pointed out that at this present embodiment only is used for the present invention is further specified; can not be interpreted as limiting the scope of the invention, the person skilled in the art in this field can make some nonessential improvement and adjustment to the present invention according to the content of the invention described above.
Embodiment 1
5.91 gram acrylamides, 1.06 gram sodium acrylates, 0.1 gram N-are dissolved in the 81.3 ml deionized water adding three-necked bottle butyl phenyl acrylamide and 10 gram sodium lauryl sulphate, and regulator solution PH=9-10, temperature of reaction system are 50 ℃, logical N
2Gas adds 13.3 milligrams of Potassium Persulphate initiators after 30 minutes, reacted 12 hours.The polymkeric substance dilute with water is used acetone precipitation, washing again, and vacuum-drying obtains white powdered AM-NaAA-BPAM polymkeric substance, gets a certain amount of polymer formulation oil-displacing agent aqueous sample, is the water white transparency shape.With polymer concentration is 0.15wt%, Trombovar concentration be 0.5 milli rub/liter, NaCl concentration is 1.5wt%, adds to have in the mixing kettle of agitator and thermometer, stir for 25 ℃ in temperature, obtain high tackify hydrophobic associated water-soluble polymer oil-displacing agent.
Embodiment 2
6.6 gram acrylamides, 3.5 gram sodium acrylates, 0.1 gram N-are dissolved in 81.3 ml deionized water to butyl phenyl acrylamide and 2.7 gram sodium lauryl sulphate, and regulator solution PH=9-10, temperature of reaction system are 50 ℃, logical N
2Gas adds 13.3 milligrams of Potassium Persulphate initiators after 30 minutes, reacted 12 hours.The polymkeric substance dilute with water, use acetone precipitation, washing again, vacuum-drying obtains white powdered AM-NaAA-BPAM polymkeric substance, get a certain amount of polymer formulation oil-displacing agent aqueous sample, be the water white transparency shape, polymer concentration is 0.2wt%, cetyl trimethylammonium bromide concentration be 1 the milli rub/liter, NaCl concentration is 1.5wt%, adding has in the mixing kettle of agitator and thermometer, stirs for 30 ℃ in temperature, obtains high tackify hydrophobic associated water-soluble polymer oil-displacing agent.
4.16 gram acrylamides, 2.91 gram sodium acrylates, 0.1 gram N-are dissolved in 81.3 ml deionized water to butyl phenyl acrylamide and 1.8 gram sodium lauryl sulphate, and regulator solution PH=9-10, temperature of reaction system are 50 ℃, logical N
2Gas adds 13.3 milligrams of Potassium Persulphate initiators after 30 minutes, reacted 12 hours.The polymerisate dilute with water, use acetone precipitation, washing again, vacuum-drying obtains white powdered AM-NaAA-BPAM polymkeric substance, gets a certain amount of polymers soln preparation oil-displacing agent aqueous sample, polymer concentration is 0.1wt%, dodecyl dimethyl ammonium oxide concentration be 0.5 milli rub/liter, NaCl concentration is 0.5wt%, adds to have in the mixing kettle of agitator and thermometer, stir for 35 ℃ in temperature, obtain high tackify hydrophobic associated water-soluble polymer oil-displacing agent.
Critical association concentration (the C of table 1 copolymer solution
*)
Sample C
*(wt%)
AM-NaAA-BPAM-3 0.11
AM-NaAA-BPAM-5 0.14
AM-NaAA-BPAM-7 0.16
Claims (1)
1. the preparation method of high tackify hydrophobic associated polymer oil-displacing agent is characterized in that:
(1) preparation of hydrophobic associated polymer
With acrylamide 35-94.5 part, sodium acrylate 5-60 part, N-is to butyl phenyl acrylamide 0.3-3 part, and tensio-active agent 5-300 part, deionized water 500-3333 part add in the three-necked bottle, regulator solution PH=9-10, in temperature 30-60 ℃, logical N
2Gas adds persulfate initiator 0.01-1 part after 30 minutes, reacted 12 hours, and the polymkeric substance dilute with water is used acetone precipitation, washing again, and vacuum-drying obtains white powdered acrylic amide-acrylic sodium-N-to the butyl phenyl acrylamide polymer,
Wherein persulfate initiator is a Potassium Persulphate, a kind of in Sodium Persulfate and/or the ammonium persulphate etc.,
(2) preparation of hydrophobic associated polymer oil-displacing agent
It is 0.1-0.3wt% that acrylamide (AM)-sodium acrylate (NaAA)-N-is made into concentration to butyl phenyl acrylamide (BPAM) hydrophobic associated water-soluble polymer, surfactant concentration be 0.01-1 rub in the least/liter and NaCl concentration be the solution of 0.5-1.5wt%, add and have in the mixing tank of agitator and thermometer, being 25-40 ℃ in temperature stirs, obtain high tackify hydrophobic associated water-soluble polymer oil-displacing agent
Wherein tensio-active agent contains: anion surfactant is C
8-16Sodium alkyl benzene sulfonate, C
8-16Sodium alkyl sulfate; Cats product is C
8-16Alkyl trimethyl ammonium bromide; Nonionogenic tenside is C
8-16The alkyl dimethyl ammonium oxide, C
8-16Alkyl polyoxyethylene ether.
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| CN100341909C (en) * | 2005-03-18 | 2007-10-10 | 中国科学院理化技术研究所 | Method for synthesizing hydrophobic association water-soluble polymer by adopting template copolymerization method |
| CN100378190C (en) * | 2005-07-26 | 2008-04-02 | 中国科学院理化技术研究所 | Nano water-soluble microgel oil displacement material and preparation method thereof |
| CN100389136C (en) * | 2005-07-01 | 2008-05-21 | 中国科学院化学研究所 | Hydrophobically associating polyacrylamide and its preparing method |
| CN100391990C (en) * | 2005-12-08 | 2008-06-04 | 西南石油学院 | Water-solubility molecule associatad three-construction units hydrophobic associated polymer and synthesizing process thereof |
| CN102161883A (en) * | 2011-01-28 | 2011-08-24 | 胜利油田胜利勘察设计研究院有限公司 | Composite chemical oil displacement agent for tertiary oil recovery in oil field |
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