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Method for preparing cationic polymer for increasing and/or stabilizing viscosity of hydrophobic association type polymer oil-displacing agent

A technology of cationic polymers and degree of polymerization, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of enhancing hydrophobic association, accelerating the rate of association, intensifying association, etc., and achieving polymerization conversion rate High, improve the use of efficiency, high viscosity stability effect

Active Publication Date: 2010-11-17
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although increasing the temperature is beneficial to improve the hydrophobicity of the hydrophobic group and enhance the hydrophobic association performance, it also speeds up the intramolecular association rate and the long-term stability of the solution is worse; the addition of small molecule electrolytes can increase the polarity of the solvent property, which enhances the hydrophobic association, which will also lead to the intensification of the intramolecular association of the hydrophobic association polymer under high salinity, and the change of the salinity has a great influence on the hydrophobic association polymer, making the hydrophobic Associative polymers are not resistant to high salt
[0004] Therefore, in order for AP-P4 to be truly applied, it is necessary to solve the problems of long-term stability and high salt resistance of existing hydrophobic association polymers for oil displacement

Method used

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  • Method for preparing cationic polymer for increasing and/or stabilizing viscosity of hydrophobic association type polymer oil-displacing agent
  • Method for preparing cationic polymer for increasing and/or stabilizing viscosity of hydrophobic association type polymer oil-displacing agent
  • Method for preparing cationic polymer for increasing and/or stabilizing viscosity of hydrophobic association type polymer oil-displacing agent

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Experimental program
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Effect test

Embodiment 1

[0042] Embodiment 1, the preparation of cationic polymer

[0043] Add acrylamide (Sinopharm Chemical Reagent Co., Ltd.), cetyldimethyl-5-enhexyl ammonium bromide, sodium lauryl sulfate (Tianjin Kemeng Chemical Industry and Trade Co., Ltd.), and deionized water In the reactor, feed nitrogen to stir, place the reaction vessel in a constant temperature water bath at 80°C, add potassium persulfate (Sinopharm Chemical Reagent Co., Ltd.) The product is dried in a vacuum oven to prepare a cationic polymer. Wherein the mol ratio of acrylamide, hexadecyldimethyl-5-enhexyl ammonium bromide is 98: 2, sodium lauryl sulfate accounts for 32% of the total mass of the reaction monomer, and the ratio of reactant and deionized water The mass ratio is 12:88, and the addition amount of the initiator is 0.20% of the reaction monomer. The product is represented by No.1, the yield is 80.23%, and the cationic degree is 0.025%.

[0044] The structural formula of this cationic polymer is formula (I)...

Embodiment 2

[0047] Embodiment 2, the preparation of cationic polymer

[0048] Add acrylamide, hexadecyldimethyl-5-enhexylammonium bromide, sodium lauryl sulfate, and deionized water into the reactor, blow in nitrogen gas and stir, and place the reaction vessel in a constant temperature water bath at 75°C , and then add potassium persulfate initiator, continue nitrogen reaction for 6 hours, place the obtained milky white colloidal product in a vacuum drying oven to dry, and prepare a cationic polymer. Wherein the mol ratio of acrylamide, hexadecyldimethyl-5-enhexyl ammonium bromide is 98: 2, sodium lauryl sulfate accounts for 47% of the total mass of the reaction monomer, and the ratio of reactant and deionized water The mass ratio is 12:88, and the addition amount of the initiator is 0.18% of the reaction monomer. The product is represented by No.2, the yield is 88.57%, and the cationic degree is 0.29%.

[0049] The structural formula of this cationic polymer is formula (I), and in the ...

Embodiment 3

[0052] Embodiment 3, the preparation of cationic polymer

[0053] Add acrylamide, hexadecyldimethyl-5-enhexylammonium bromide, sodium lauryl sulfate, and deionized water into the reactor, blow in nitrogen gas and stir, and place the reaction vessel in a constant temperature water bath at 70°C , and then add potassium persulfate initiator, continue nitrogen reaction for 6 hours, place the obtained milky white colloidal product in a vacuum drying oven to dry, and prepare a cationic polymer. Wherein the mol ratio of acrylamide, hexadecyldimethyl-5-enhexyl ammonium bromide is 98: 2, sodium lauryl sulfate accounts for 18% of the total mass of the reaction monomer, and the ratio of reactant to deionized water The mass ratio is 9:91, and the addition amount of the initiator is 0.17% of the reaction monomer. The product is represented by No.3, the yield is 85.85%, and the cationic degree is 0.66%.

[0054] The structural formula of this cationic polymer is formula (I), and in the fo...

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Abstract

The invention discloses a method for preparing a cationic polymer. The structural formula of the cationic polymer is as shown in the formula(I), wherein m is a natural number from 1,355 to 1,984 when m is number-average degree of polymerization, and n is a natural number from 1 to 17 when n is number-average degree of polymerization; and m is a natural number from 2,392 to 3,472 when m is weight-average degree of polymerization, and n is a natural number from 2 to 30 when n is weight-average degree of polymerization. In the method, acrylamide and hexadecyl dimethyl-5-olefine hexyl ammonium bromide serving as synthesis monomers are polymerized by the conventional free radical polymerization method in the presence of potassium sulfate serving as an initiator and sodium dodecyl sulfate serving as an auxiliary agent to prepare the cationic polymer. The method has the advantages of simple method, high yield of monomers and high conversion rate of polymerization. The cationic polymer prepared by the method of the invention can be used for increasing and stabilizing the viscosity of the hydrophobic association type polymer oil-displacing agent.

Description

technical field [0001] The invention relates to a preparation method of a cationic polymer, in particular to a preparation method of a cationic polymer which can be used to increase and stabilize the viscosity of a hydrophobic association polymer oil displacement agent, and belongs to the field of polymer material synthesis. Background technique [0002] Hydrophobically associated water-soluble polymers (AP-P4) have become one of the new hotspots in the scientific research of polymer materials. It refers to a class of water-soluble polymers with a small amount of hydrophobic groups on the hydrophilic macromolecular chain Polymers, whose solution properties are quite different from general polymer solutions. In aqueous solution, the hydrophobic groups of such polymers aggregate due to hydrophobic interactions, resulting in intramolecular and intermolecular associations of macromolecular chains. When the polymer concentration is higher than a certain critical concentration (c...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F226/02C09K8/588
Inventor 朱玥珺张健
Owner CHINA NAT OFFSHORE OIL CORP
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