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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

AI Technical Summary

Problems solved by technology

[0004] In Document 1 (Macromolecules, Vol.33, No.2, 2000), a macromonomer and its preparation method are disclosed, but the prior art does not disclose its use in temperature-resistant and salt-resistant grafted polyacrylamide Applications

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

Experimental program
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Effect test

Embodiment 1

[0050] Embodiment 1 Poly (N, N-dimethylacrylamide) acrylamide macromolecular monomer A

[0051] Dissolve 20.0 grams of N,N-dimethylacrylamide in 80.0 grams of absolute ethanol, pass high-purity nitrogen gas to remove oxygen for 20 to 30 minutes, add 1.16 grams of mercaptoethylammonium hydrochloride and 166 mg of azobisisobutyl Clear, react at 60-70°C for 6 hours, add sodium hydroxide solution to adjust the pH value to 8-9, remove most of the solvent under reduced pressure, centrifuge, precipitate in ether three times, and dry to obtain a large single white solid Body precursor, its structural formula is shown in formula (3).

[0052]

[0053] Add 20.0 grams of macromonomer precursor and 60.0 grams of tetrahydrofuran into the three-necked flask, dissolve 5.0 grams of acryloyl chloride in 15 grams of tetrahydrofuran, and add it to the above reaction solution while stirring. The ice-water bath controls the reaction temperature at 0-4 ° C. At the same time, a certain amount of...

Embodiment 2

[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, pass through high-purity nitrogen gas for deoxygenation for 20 to 30 minutes, add 116 mg of mercaptoethylammonium hydrochloride and 166 mg of azobisisobutyl Clear, react at 60-70°C for 6 hours, add sodium hydroxide solution to adjust the pH value to 8-9, remove most of the solvent under reduced pressure, centrifuge, precipitate in ether three times, and dry to obtain a large single white solid Body precursor, its structural formula is shown in formula (3). Add 20.0 grams of macromonomer precursor and 60.0 grams of tetrahydrofuran into the three-necked flask, dissolve 2.0 grams of acryloyl chloride in 15 grams of tetrahydrofuran, and add it to the above reaction solution while stirring, and control the reaction temperature at 0-4°C in an ice-water bath. At the same time, a certain amount of 10% sodium carbonate ...

Embodiment 3

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

[0057] At room temperature, 5.10 g of acrylamide, 4.90 g of 2-acrylamido-2-methylpropanesulfonic acid and 1.0 g of poly(N,N-dimethylacrylamide) acrylamide macromonomer A (Mn= 3800) into the polymerization reaction bottle, add 19 grams of water to dissolve, nitrogen deoxygenation after 20 minutes, then add 1.0 grams of azobisisobutylamidine hydrochloride aqueous solution with a mass concentration of 0.025%, and 0.1% ammonium persulfate 1.0 grams of aqueous solution, 1.0 grams of 0.3% edetate disodium solution in mass concentration, 1.0 grams of 0.6% urea solution in mass concentration, 1.0 grams in 0.1% sodium bisulfite solution in mass concentration, 3.7 grams of sodium hydroxide solution in 25% mass concentration gram, adjust the pH value to 7.5, react at 8°C for 6 hours, then raise the temperature to 50°C for 4 hours to obtain a...

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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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