Acrylic amide modified graft copolymer, preparation method and application thereof

A technology of graft copolymer and acrylamide, which is applied in the field of acrylamide modified graft copolymer and its preparation, which can solve the problems of easy blockage of pore throat and large hydrodynamic radius of comb polymer

Inactive Publication Date: 2011-06-15
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Luo Jianhui et al., Acta Petroleum Sinica, 2004, 25(2): 67-73, synthesized AM / AHPE comb copolymer (KYPAM), the molecular weight of this type of polymer is as high as 2.514×10 7 , the thickening ability in salt water is more than 50% higher than the thickening ability of domestic ultra-high molecular weight polyacrylamide in salt water, but its apparent viscosity in salt water is also lower than that in fresh water, and the comb polymer The hydrodynamic radius is large, it is only suitable for high permeability reservoirs, and it is easy to block the pore throats of medium and low permeability reservoirs

Method used

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  • Acrylic amide modified graft copolymer, preparation method and application thereof
  • Acrylic amide modified graft copolymer, preparation method and application thereof
  • Acrylic amide modified graft copolymer, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 20.000 grams of acrylamide, 2.600 grams of 2-acrylamide-2-methylpropanesulfonic acid, 6.510 grams of allyl octylphenol polyoxyethylene ether (the adduct EO of polyoxyethylene ether is 20), 18 Dissolve 8.200 g of alkyl dimethyl allyl ammonium chloride in 320 ml of distilled water, add it to a three-necked reaction flask, adjust the pH of the solution to 4 with NaOH, and the reaction temperature is 65°C, and pass through N 2 After 30 minutes, add 8.20 mL of 0.05 mol / L potassium persulfate initiator solution, react for 32 hours, and dilute the polymer with water to obtain a PAB concentrated solution.

Embodiment 2

[0038] 20.000 grams of acrylamide, 17.310 grams of 2-acrylamido-2-tetradecylethanesulfonic acid, 11.400 grams of allyl octylphenol polyoxyethylene ether (the adduct EO of polyoxyethylene ether is 40), Dissolve 5.720 g of dodecyl dimethyl allyl ammonium chloride in 680 ml of distilled water, add it to a three-necked reaction flask, adjust the pH of the solution to 7 with NaOH, the reaction temperature is 75°C, and pass through N 2 After 30 minutes, add 14.00 mL of 0.05 mol / L potassium persulfate initiator solution, react for 36 hours, and dilute the polymer with water to obtain a PAB concentrated solution.

Embodiment 3

[0040] 20.000 grams of acrylamide, 5.120 grams of vinylbenzenesulfonic acid, 4.360 grams of 4-vinylbenzyl nonylphenol polyoxyethylene ether (EO is 10), dodecyldimethyl (4-vinylbenzyl) Dissolve 2.380 grams of ammonium chloride in 290 milliliters of deionized water, adjust the pH to 3.5 with NaOH, the reaction temperature is 55 ° C, and pass through N 2 After 30 minutes, add 3.08 mL of 0.05 mol / L ammonium persulfate initiator solution, and react for 12 hours. The polymer was dissolved in water to obtain a PAB concentrated solution.

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Abstract

The invention discloses an acrylamide modified graft copolymer and a preparation method and usage thereof. The invention is characterized in that 20 parts of acrylamide, 1-20 parts of anionic monomer and / or cationic monomer, 0.1-15 parts of macromonomer, 0.05-10 parts of ionic lyophobic monomer and 50-1000 parts of deionized water are added into a three-necked reaction bottle, the pH value is adjusted to be 3-9, N2 is introduced for 30min, then 0.002-0.5 parts of initiator persulfate is added at 30-75 DEG C, the copolymer PAB is obtained by reacting for 8-36h, and finally water is used for dilution to obtain strong PAB solution. The PAB has higher apparent viscosity in high saline solution than in fresh water. The PAB is prepared into a water solution with mass concentration of 0.2-3.0g / L and surfactant concentration of 0.01-2 mmol / L, then the water solution is added into a mixing vessel with a stirring device, and then a polymer oil-displacing agent is obtained through uniform mixing at a room temperature. The copolymer PABE is prepared into water solution which has mass concentration of 0.05-7%, and obtains the macromolecule surfactant and is applicable to an emulsifier, an emulsion splitter, a solubilizer and a wetting agent.

Description

1. Technical field [0001] The invention relates to an acrylamide-modified graft copolymer and its preparation method and application, belonging to the fields of polymer materials and enhanced oil recovery. 2. Technical background [0002] In order to enhance oil recovery, the polymer currently used in polymer flooding technology is mainly partially hydrolyzed polyacrylamide (HPAM). HPAM has a linear molecular structure, and its viscosity increase mainly depends on ultra-high molecular weight, with a molecular weight as high as 1.6×10 7 ~3.0×10 7 , The degree of hydrolysis is generally 10-30%. The linear molecular structure and high degree of hydrolysis of HPAM make it poor in salt resistance, temperature resistance, shear resistance and aging resistance in high salinity reservoirs. Therefore, HPAM can only be used for low temperature and low mineralization. in chemical reservoirs. In order to improve the salt resistance of HPAM solution and the performance of other solut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/52C08F228/02C08F222/02C08F220/34C08F220/60C08F236/02C08J3/075C09K8/588
Inventor 钟传蓉孟祥豪蒋留锋王世高
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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