Temperature and salt resistant grafted polyacrylamide and preparation method thereof

A technology of polyacrylamide and polyacrylamide oil displacement agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the undisclosed problems such as the application of temperature-resistant and salt-resistant grafted polyacrylamide, and achieve improvement Monomer conversion rate, good temperature resistance effect

Active Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In Document 1 (Macromolecules, Vol.33, No.2, 2000), a macromonomer and its preparation method are disclosed, but

Method used

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  • Temperature and salt resistant grafted polyacrylamide and preparation method thereof
  • Temperature and salt resistant grafted polyacrylamide and preparation method thereof
  • Temperature and salt resistant grafted polyacrylamide and preparation method thereof

Examples

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Example Embodiment

[0050] Example 1 Poly(N,N-dimethylacrylamide)acrylamide type macromonomer A

[0051] Dissolve 20.0 grams of N,N-dimethylacrylamide in 80.0 grams of absolute ethanol, deoxidize with high-purity nitrogen for 20-30 minutes, add 1.16 grams of mercaptoethylammonium hydrochloride and 166 mg of azobisisobutyl Clear, react at 60~70℃ for 6 hours, add sodium hydroxide solution to adjust the pH to 8~9, remove most of the solvent under reduced pressure, centrifuge, precipitate three times in ether, and dry to obtain a white solid The structure of the body precursor is shown in formula (3).

[0052]

[0053] Add 20.0 grams of macromonomer precursor and 60.0 grams of tetrahydrofuran into a three-necked flask, dissolve 5.0 grams of acryloyl chloride in 15 grams of tetrahydrofuran, and add to the above reaction solution under stirring. The reaction temperature is controlled at 0-4°C in an ice water bath. At the same time, a certain amount of 10% sodium carbonate aqueous solution was added dropwis...

Example Embodiment

[0054] Example 2 Poly(N,N-dimethylacrylamide)acrylamide type macromonomer B

[0055] Dissolve 20.0 grams of N,N-dimethylacrylamide in 80.0 grams of absolute ethanol, deoxidize with high-purity nitrogen for 20-30 minutes, add 116 mg of mercaptoethylammonium hydrochloride and 166 mg of azobisisobutyl Clear, react at 60~70℃ for 6 hours, add sodium hydroxide solution to adjust the pH to 8~9, remove most of the solvent under reduced pressure, centrifuge, precipitate three times in ether, and dry to obtain a white solid The structure of the body precursor is shown in formula (3). Add 20.0 grams of macromonomer precursor and 60.0 grams of tetrahydrofuran into a three-necked flask, dissolve 2.0 grams of acryloyl chloride in 15 grams of tetrahydrofuran, and add to the above reaction solution with stirring. Control the reaction temperature at 0-4°C in an ice-water bath. At the same time, a certain amount of 10% sodium carbonate aqueous solution was added dropwise, and after 2 hours of rea...

Example Embodiment

[0056] Example 3 Preparation of the temperature-resistant and salt-resistant grafted polyacrylamide oil displacing agent of the present invention

[0057] At room temperature, 5.10 grams of acrylamide, 4.90 grams of 2-acrylamido-2-methylpropanesulfonic acid and 1.0 grams of poly(N,N-dimethylacrylamide) acrylamide type macromonomer A (Mn= 3800) Add to the polymerization reaction flask, add 19 grams of water to dissolve, after deoxidizing with nitrogen for 20 minutes, add 1.0 grams of azobisisobutylamidine hydrochloride aqueous solution with a mass concentration of 0.025% and a mass concentration of 0.1% ammonium persulfate in sequence 1.0 g aqueous solution, 1.0 g disodium edetate solution with a mass concentration of 0.3%, 1.0 g urea solution with a mass concentration of 0.6%, 1.0 g sodium bisulfite solution with a mass concentration of 0.1%, sodium hydroxide solution with a mass concentration of 25% 3.7 G, adjust the pH to 7.5, react at 8°C for 6 hours, and then heat to 50°C for...

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Abstract

The invention relates to a temperature and salt resistant grafted polyacrylamide synthesized by a macromonomer route, belonging to the research field of water-soluble polymer used for displacement of reservoir oil. A method of chain transfer free radical polymerization and terminal group replacement is adopted to obtain a polyacrylamide (N,N-dimethylacrylamide) type macromonomer. Under an oxidation-reduction complex initiation system, temperature and salt resistant monomers, such as the macromonomer, acrylamide, N-polyvinyl pyrrolidone, N,N-dimethylacrylamide, 2-Acryloylamino-2-methyl propanesulfonic acid and the like, are copolymerized to obtain a target product. From molecular design, a functional long-grafted side chain can increase the viscoelasticity of the polymer molecule and lower solution surface tension. The product provided by the invention can be used for three-class oil deposit and provides a possible solution for improving the recovery ratio for chemical displacement of reservoir oil.

Description

technical field [0001] The invention relates to the field of tertiary oil recovery, in particular to a temperature-resistant and salt-resistant grafted polyacrylamide and a preparation method thereof. Background technique [0002] Macromonomer refers to a class of linear polymers containing polymerizable units at the end of the molecular chain, and its molecular weight is usually above 1000. The preparation of macromers includes methods such as anionic, cationic and free radical polymerization. The free radical polymerization method is widely used in the preparation of macromonomers due to its wide selection of monomers, simple operation and practicality. This method generally includes two steps. First, the macromonomer precursor is obtained by chain transfer radical polymerization. The chain transfer agent will also purposefully introduce a further reactive monomer at the end of the macromonomer precursor while polymerizing to produce chain transfer. Functional groups (su...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F220/60C09K8/588
Inventor 伊卓刘晓光赵方园祝纶宇李勇杜凯计文希魏小林
Owner CHINA PETROLEUM & CHEM CORP
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