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Amphoteric hydrophobically-associating polymer and preparation method thereof

A hydrophobic association and polymer technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of temperature resistance, salt resistance and shear resistance that cannot meet the requirements of tertiary oil recovery, and achieve excellent viscosity increasing effect , Excellent temperature resistance and salt resistance, the effect of controllable molecular weight

Active Publication Date: 2015-03-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] One of the technical problems to be solved by the present invention is that the temperature and salt resistance and shear resistance of polymers in the prior art cannot meet the requirements of tertiary oil recovery. An amphoteric hydrophobic association polymer is provided, which has high efficiency The characteristics of viscosity increasing, temperature resistance and salt resistance, heat stability and shear resistance are excellent

Method used

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  • Amphoteric hydrophobically-associating polymer and preparation method thereof
  • Amphoteric hydrophobically-associating polymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Add 2500g of deionized water to the reaction kettle, add 450g of acrylamide (AM), 200g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 2.5g of sodium 2-acrylamidotetradecylsulfonate (NaAMC 14 S) and 3.5g of acryloyloxyethyltrimethylammonium chloride (DAC), neutralized to neutral with NaOH, then added 0.04g of disodium edetate, 7g of urea, 0.07g of isopropanol, and stirred until completely dissolved. Adjust the pH value to 8.5 with NaOH, and start to feed high-purity nitrogen gas. After 30 minutes, the temperature in the kettle was lowered to 15°C, and then 10 g of 0.2% sodium bisulfite aqueous solution, 0.5% methacrylic acid N,N-di 10g of methylaminoethyl ester (DMAEMA) aqueous solution, 10g of 0.5% azobisisobutylamidine hydrochloride, 10g of 0.3% potassium persulfate aqueous solution, continue to pass nitrogen gas for 30min and then seal. After 1 hour, the reaction temperature was gradually raised to 48°C. After 3.5 hours of reaction, a gel-like polymer product ...

Embodiment 2

[0054] First add 2500g of deionized water to the reaction kettle, add 500g of acrylamide (AM), 180g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 3.0g of 2-acrylamido sodium dodecylsulfonate (NaAMC12 S) and 4.2g of methacryloyloxyethyltrimethylammonium chloride (DMC), neutralized to neutral with NaOH, then added 0.045g of disodium edetate, 7.0g of urea, and 0.06 of isopropanol g, stirred until completely dissolved. Adjust the pH value to 9.1 with NaOH, and start to feed high-purity nitrogen. After 30 minutes, the temperature in the kettle was lowered to 12°C, and then 10.6 g of 0.2% sodium bisulfite aqueous solution, 0.5% acrylic acid N,N-dimethyl Aminoethyl ester (DA) aqueous solution 12g, 0.5% azobisisobutylamidine hydrochloride 11g, 0.3% potassium persulfate aqueous solution 12g, continue nitrogen gas for 30min and then seal. After 1 hour, the reaction temperature was gradually raised to 52 ° C, and after 3 hours of reaction, a gel-like polymer product was obtained....

Embodiment 3

[0057] First add 2800g of deionized water to the reaction kettle, add 500g of acrylamide (AM), 120g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 120g of acrylic acid, 3.5g of 2-acrylamido hexadecyl Sodium sulfonate (NaAMC 16 S) and 5.2g of dimethyl diallyl ammonium chloride (DMDAAC), neutralized to neutral with NaOH, then added 0.05g of disodium edetate, 8.0g of urea, 0.07g of isopropanol, and stirred until completely dissolved. Adjust the pH value to 8.8 with NaOH, and start feeding high-purity nitrogen gas. After 30 minutes, the temperature in the kettle was lowered to 20°C, and then 11.2 g of 0.2% aqueous sodium bisulfite solution, 0.5% acrylic acid N,N-dimethyl Aminoethyl ester (DA) aqueous solution 12.5g, 0.5% 2,2'-azo[2-(2-imidazolin-2-yl)propane] dihydrochloride 13g, 0.3% potassium persulfate aqueous solution 12g, Continue to pass nitrogen gas for 30 minutes before sealing. After 1 hour, the reaction temperature was gradually increased to 55°C. After 2.5 ...

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Abstract

The invention relates to an amphoteric hydrophobically-associating polymer and a preparation method thereof, and is mainly used for solving the problem that polymers are poor in heat resistance, salt tolerance and shear resistance, and incapable of meeting the requirements of tertiary oil recovery in the prior art. According to the amphoteric hydrophobically-associating polymer and the preparation method thereof disclosed by the invention, the problem is solved well by adopting the technical scheme that the amphoteric hydrophobically-associating polymer contains, in parts by weight, 5-99.9 parts of non-ionic water-soluble monomer, 0-50 parts of anionic monomer or / and cationic monomer, and 0.1-10 parts of hydrophobic monomer with surface activity. The amphoteric hydrophobically-associating polymer and the preparation method thereof can be used for industrial production and application of polymers for oil field tertiary oil recovery.

Description

technical field [0001] The invention relates to an amphoteric hydrophobic association polymer and a preparation method thereof. Background technique [0002] After primary and secondary oil recovery in major domestic oil fields, the water content of crude oil continues to increase, and some large oil fields have entered the stage of tertiary oil recovery. Polymer flooding is the main technical method of tertiary oil recovery. The oil flooding mechanism is clear, the process is relatively simple, and the technology is becoming more and more mature. It is an effective technical measure for enhancing oil recovery. The oil displacement mechanism of the polymer is mainly to use the viscosity of the water-soluble polyacrylamide molecular chain to improve the mobility ratio of the displacement fluid, increase the displacement efficiency and the swept volume, so as to achieve the purpose of enhancing the recovery factor. Due to the long tertiary oil recovery cycle and high temperat...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F220/34C08F220/06C08F226/02C08F222/02C08F4/40C09K8/588
Inventor 夏燕敏许汇蔡红宋晓芳于志省
Owner CHINA PETROLEUM & CHEM CORP
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