Hydrophobic association zwitterionic polymer and preparation method thereof

A technology of amphoteric ion and hydrophobic association, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor thermal stability and biological stability, high cost, sudden change of solution performance, etc., and achieve industrial production , Low production cost, strong viscosity increasing effect

Active Publication Date: 2014-01-01
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most commonly used polymer oil displacement agents in oilfields are biopolymer xanthan gum and synthetic polymer partially hydrolyzed polyacrylamide (HPAM), which have achieved good results in most blocks of the oilfield. There are insurmountable problems in high-temperature and high-salt reservoirs: although xanthan gum has good salt tolerance, its thermal stability and biological stability are poor, it is easy to degrade and block the oil layer, and the cost is high; HPAM Rely on high molecular weight and on-chain—COO - The electrostatic repulsion makes the molecular chain stretch, so as to achieve the effect of thickening, but under the conditions of high temperature, high salt, high shear, etc., HPAM is easy to hydrolyze, degrade

Method used

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  • Hydrophobic association zwitterionic polymer and preparation method thereof
  • Hydrophobic association zwitterionic polymer and preparation method thereof
  • Hydrophobic association zwitterionic polymer and preparation method thereof

Examples

Experimental program
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preparation Embodiment 1

[0041] Preparation Example 1: Synthesis of Hydrophobically Associating Zwitterionic Polymers

[0042] Add 5.68g of acrylamide (0.08mol), 0.57g of acrylic acid (0.008mol) and 1.76g of methacryloxyethyltrimethylammonium chloride (0.008mol) into the reactor successively, dissolve in 40ml of distilled water, drop slowly Add 10% NaOH solution to adjust the pH of the system to 7, add distilled water to control the total monomer concentration of 15% (mass fraction), then add 2.15g of surfactant sodium dodecyl sulfate (SDS), stir well Finally, 1.48g N-(5-methyl-3-tert-butyl-2-hydroxy-benzyl)acrylamide (0.006mol) was added and stirred continuously to fully dissolve it in the SDS micelles to form a nearly transparent homogeneous phase system. After purging nitrogen for 20 minutes to remove oxygen, add 0.047g of azobisisobutylamidine hydrochloride (0.50% of the total monomer mass), and react at a constant temperature of 56°C for 8 hours to obtain a colorless and transparent gel-like cru...

preparation Embodiment 2

[0043] Preparation Example 2: Synthesis of Hydrophobically Associating Zwitterionic Polymers

[0044] Add 5.68g of acrylamide (0.08mol), 0.29g of acrylic acid (0.004mol) and 0.88g of methacryloyloxyethyltrimethylammonium chloride (0.004mol) into the reactor successively, dissolve in 40ml of distilled water, drop slowly Adding a mass fraction of 10% NaOH solution to adjust the pH of the system is 7, adding distilled water to control the total monomer concentration is 15% (mass fraction), then adding 1.87g of surfactant sodium dodecyl sulfate (SDS), fully stirring Finally, 1.42g of N-(4-hydroxy-2-methyl-5-methylthio-benzyl)acrylamide (0.006mol) was added and stirred continuously to fully dissolve it in the SDS micelles to form a nearly transparent homogeneous phase system. After purging nitrogen for 20 minutes to remove oxygen, add 0.041 g of azobisisobutylamidine hydrochloride (0.50% of the total monomer mass), and react at a constant temperature of 56 ° C for 8 hours to obtai...

preparation Embodiment 3

[0045] Preparation Example 3: Synthesis of Hydrophobically Associating Zwitterionic Polymers

[0046] Add 5.68g of acrylamide (0.08mol), 0.57g of acrylic acid (0.008mol) and 1.76g of methacryloxyethyltrimethylammonium chloride (0.008mol) into the reactor successively, dissolve in 40ml of distilled water, drop slowly Adding a mass fraction of 10% NaOH solution to adjust the pH of the system to 7, adding distilled water to control the total monomer concentration of 15% (mass fraction), then adding 1.99g of surfactant sodium dodecyl sulfate (SDS), fully stirred Then add 0.77g N-(4-hydroxy-3-bromo-benzyl)acrylamide (0.003mol) and continue stirring to fully dissolve it in the SDS micelles to form a nearly transparent homogeneous system. After purging nitrogen for 20 minutes to remove oxygen, add 0.044 g of azobisisobutylamidine hydrochloride (0.50% of the total monomer mass), and react at a constant temperature of 56 ° C for 8 hours to obtain a colorless and transparent gel-like cr...

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Abstract

The invention relates to a hydrophobic association zwitterionic polymer and a preparation method thereof. The preparation method comprises the following steps: adding acrylamide, acrylic acid and cationic monomers containing quaternary ammonium groups sequentially into a reactor; adding water and dissolving; adjusting the pH value of a system to be 6 to 9 by using NaOH; supplementing deionized water to enable the total monomer mass percentage of the reaction system to be 10 to 30%; adding surfactant lauryl sodium sulfate and stirring uniformly; adding an acrylamide hydrophobic monomers containing capsaicin functional groups; introducing N2 for 20 minutes; and adding a water-soluble initiator and performing polymerization reaction to obtain the hydrophobic association zwitterionic polymer. The positive charge content and the negative charge content of the hydrophobic association zwitterionic polymer prepared with the method are equal, a solution of the polymer has an antipolyelectrolyte effect, and the hydrophobic association zwitterionic polymer has excellent salt resistance. The introduced hydrophobic units containing the capsaicin functional groups have bioactivity and adopts a rigid benzene ring structure, so that the polymer has excellent tackifying property, temperature resistance, salt resistance and anti-microbial property, high dissolution speed and low price, and has an excellent application prospect in petroleum reservoir exploitation under the conditions of high temperature, high salt and bacteria in existence.

Description

【Technical field】 [0001] The invention belongs to the field of functional polymers. More specifically, the present invention relates to a hydrophobically associating zwitterionic polymer and a method for its preparation. 【Background technique】 [0002] Petroleum still plays a key role in today's period of rapid social and economic development. However, at present, the petroleum industry is facing two major problems: (1) There are fewer and fewer new oil fields; (2) There is still a large amount of crude oil in depleted oil reservoirs, and conventional oil recovery techniques can only recover about 30% of the underlying reserves. Therefore, research and development of enhanced oil recovery technology is a very urgent subject. Tertiary oil recovery technology is a high-tech developed in the past ten years. One of the most important and mature methods is polymer flooding technology, which plays an important role in improving crude oil recovery and stabilizing crude oil produc...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F220/34C08F220/58C09K8/588
Inventor 于良民贾兰妮闫雪峰姜晓辉董磊李昌诚夏树伟张志明赵海洲李霞倪春花
Owner OCEAN UNIV OF CHINA
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