Graft-modified polyacrylamide and preparation method thereof

A polyacrylamide and graft modification technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of poor temperature resistance, salt resistance and aging resistance, and poor displacement efficiency, so as to improve the temperature resistance, The effect of increasing the three-dimensional space network structure and improving the displacement efficiency

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the technical problems to be solved by the present invention is that when ultra-high molecular weight polyacrylamide is used in the field of tertiary oil recovery in the prior art, there are problems of poor temperature resistance, salt resistance, aging resistance and poor displacement efficiency. branched polyacrylamide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Inject 0.14mol 2,2,6,6-tetramethyl-4-bromo-1-oxypiperidine sodium and 2.5mol ethylene oxide into the dry reaction flask, react at 47°C for 7 hours, add 0.14mol 2,2,6,6-tetramethyl-4-epoxypropyloxypiperidine-1-oxyl free radical, continue to react at 78°C for 6 hours, add isopropanol to terminate the reaction, and diethyl ether After precipitation, polyethylene oxide with a molecular weight of 760 in the hydrophilic segment was obtained X -PEO-NO·. Add 0.07mol of the functionalized polymer prepared above, 0.6mol of N,N-dimethylacrylamide (NDMAM), and 0.08mol of benzoyl peroxide into the reactor, pass nitrogen to remove oxygen, stir and mix evenly, and React at 98°C for 5 hours to obtain a block copolymer with a molecular weight of 800 in the hydrophobic segment X -PEO- b -PNDMAM. 0.05 g of the obtained copolymer and 2.0 g of ultra-high molecular weight polyacrylamide with a viscosity-average molecular weight of 30.5 million were dispersed in 98 g of aqueous sodium bic...

Embodiment 2

[0035] Inject 0.15mol 2,2,6,6-tetramethyl-4-chloro-1-oxypiperidine sodium and 2.0mol ethylene oxide into the dry reaction bottle, react at 55°C for 6 hours, add 0.15mol 2,2,6,6-tetramethyl-4-epoxypropyloxypiperidine-1-oxyl free radical, continue to react at 80°C for 5 hours, add isopropanol to terminate the reaction, and diethyl ether After precipitation, polyethylene oxide with a molecular weight of 550 in the hydrophilic segment was obtained X -PEO-NO·. Add 0.06mol of the functionalized polymer prepared above, 0.3mol of N,N-dibutylacrylamide (NDBAM), and 0.07mol of tert-butyl peroxy 2-ethylhexanoate into the reactor, pass nitrogen to remove oxygen , stirred and mixed evenly, and reacted at 102°C for 7 hours to obtain a block copolymer with a molecular weight of 900 in the hydrophobic segment X -PEO- b -PNDBAM. 0.06 g of the obtained copolymer and 1.8 g of ultra-high molecular weight polyacrylamide with a viscosity-average molecular weight of 28 million were dispersed in ...

Embodiment 3

[0039] Inject 0.13mol 2,2,6,6-tetramethyl-4-chloro-1-oxypiperidine sodium and 1.8mol propylene oxide into the dry reaction bottle, react at 52°C for 6 hours, then add 0.14 mol 2,2,6,6-tetramethyl-4-epoxypropyloxypiperidine-1-oxyl radical, continue to react at 88°C for 4 hours, add isopropanol to terminate the reaction, and precipitate with ether After that, the polyoxypropylene with a molecular weight of 800 in the hydrophilic segment was obtained X -PPO-NO·. Add 0.05mol of the functionalized polymer prepared above, 0.2mol of N,N-dioctylacrylamide (NDOAM), and 0.06mol of benzoyl peroxide into the reactor, pass nitrogen to remove oxygen, stir and mix evenly, and React at 100°C for 6 hours to obtain a block copolymer with a molecular weight of 900 in the hydrophobic segment X -PPO- b -PNDOAM. 0.05g of the obtained copolymer and 1.2g of ultra-high molecular weight polyacrylamide with a viscosity-average molecular weight of 32 million were dispersed in 102g of sodium hydroxide...

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Abstract

The invention relates to a graft-modified polyacrylamide and a preparation method thereof, and is used for mainly solving the problems in the prior art that polyacrylamide has poor temperature resistance, poor salt resistance, poor aging resistance and poor displacement efficiency. The graft-modified polyacrylamide has the chemical formula of HPAM-g-R, wherein HPAM is an ultra-high molecular weight polyacrylamide, R is selected from one of PEO-b-PNAM, PPO-b-PNAM, P(EO-r-PO)-b-PNAM, PEO-b-PPO-b-PNAM or PPO-b-PEO-b-PNAM, EO represents epoxy ethane, PO represents propylene oxide, PEO represents polyethylene oxide, PPO represents polypropylene oxide, and PNAM represents poly(N-substituted acrylamide); the viscosity average molecular weight of the graft-modified polyacrylamide is not less than 27000000; the preparation method is provided. Through adopting the above technical schemes, the problems are relatively well solved, and the graft-modified polyacrylamide can be used in industrial production of a polymer oil-displacing agent and in oil displacement of a high-temperature high-salinity oil reservoir.

Description

technical field [0001] The invention relates to the field of tertiary oil recovery, in particular to a graft-modified ultra-high molecular weight polyacrylamide and a preparation method thereof. Background technique [0002] The general performance requirements of water-soluble polymers in oil and gas field production mainly include: water solubility, viscosity increasing, suspension, shear thinning and thixotropy, stability and seepage characteristics to meet the requirements of oil and gas production engineering, etc. Although ultra-high molecular weight polyacrylamide can still enhance oil recovery at higher temperatures (such as 120°C) in an oxygen-free and divalent ion-free environment, water-soluble polymers commonly used in tertiary oil recovery still exist when they are used for oil displacement. many questions. For example, when the temperature is high, the hydrolysis of polyacrylamide is serious; when the formation temperature exceeds 75°C, as the formation temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08F293/00C08G65/333C09K8/588
Inventor 于志省夏燕敏
Owner CHINA PETROLEUM & CHEM CORP
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