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Acrylamide copolymer and its preparation method and application

A technology of acrylamide copolymer and acrylamide copolymerization, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of deep control and flooding, short cycle, complex oil-water relationship, etc., and reduce the oil-water gauge. The effect of interfacial tension and good emulsifying properties

Active Publication Date: 2021-02-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the face of extremely high water cut stage, due to the serious water flooding of the oil well and the complex oil-water relationship, these chemical agents cannot achieve the purpose of deep water control and flooding, and can only work in the area close to the implementation well, resulting in a short implementation period on site and low effectiveness. Difference

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  • Acrylamide copolymer and its preparation method and application
  • Acrylamide copolymer and its preparation method and application
  • Acrylamide copolymer and its preparation method and application

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specific Embodiment approach

[0038] Methods for preparing acrylamide copolymers include:

[0039] a) Add acrylamide to the reactor to form an aqueous solution, adjust the pH value, then add monomer X, monomer Y, emulsifier, complex aqueous solution, urea and accelerator, and stir well to make it a stable micelle solution;

[0040] b) adding an initiator, blowing inert gas to make it evenly mixed, sealing and carrying out solution polymerization reaction to obtain polymer colloid;

[0041] c) Take out the colloid, add an alkaline substance after granulation, make it mix evenly, and carry out a hydrolysis reaction;

[0042] d) granulating, drying, pulverizing and sieving the hydrolysis reaction product to obtain the acrylamide copolymer.

[0043] The third aspect of the present invention provides the application of the acrylamide copolymer described in the first aspect of the present invention and the acrylamide copolymer prepared by the method described in the second aspect of the present invention in a ...

Embodiment 1

[0049] 1) Add 19g of acrylamide into the thermal insulation polymerization reaction bottle, add 60g of deionized water to dissolve to make an aqueous solution, then add sodium hydroxide to adjust the pH to 7, add monomer X0.1g, monomer Y1 (n=0) in sequence 0.9g, 0.1g of sodium lauryl sulfate, 1g of EDTA-2Na aqueous solution of 1% by weight, 0.1g of urea, 40mg of pentamethyldiethylenetriamine, fully stirred to become a stable micellar solution;

[0050] 2) At 30°C, after passing nitrogen into the solution to drive oxygen for 30 minutes, add 3 g of 0.2% by weight potassium persulfate aqueous solution and 3 g of 0.1% by weight sodium bisulfite aqueous solution to initiate the reaction, and continue to pass nitrogen gas for five minutes Stop, polymerize after sealing for 10 hours to obtain polymer colloid;

[0051] 3) Take out the colloid, add 0.45g of sodium hydroxide granular alkali after granulation, mix evenly, and carry out hydrolysis reaction at 90°C for 2 hours;

[0052] 4...

Embodiment 2

[0056] 1) Add 18g of acrylamide to the thermal insulation polymerization reaction bottle, add 60g of deionized water to dissolve to make an aqueous solution, then add sodium hydroxide to adjust the pH to 10, add monomer X0.5g, monomer Y2 (n=2) in sequence 1.5g, 0.2g of pentamethyldiethylenetriamine, 1g of 1% by weight of EDTA-2Na aqueous solution, 0.5g of urea, 100mg of pentamethyldiethylenetriamine, fully stirred to form a stable micellar solution;

[0057] 2) At 25° C., after passing nitrogen into the solution to drive oxygen for 30 minutes, add 4 g of 0.2% by weight potassium persulfate aqueous solution and 4 g of 0.1% by weight sodium bisulfite aqueous solution to initiate the reaction, and continue to pass nitrogen gas for five minutes Stop, polymerize after sealing for 8 hours to obtain polymer colloid;

[0058] 3) Take out the colloid, add 0.5g sodium hydroxide granular alkali after granulation and mix evenly, then carry out hydrolysis reaction at 85°C for 2.5 hours;

...

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Abstract

The invention relates to the field of oilfield chemicals, and discloses an acrylamide copolymer, a preparation method and application thereof. The acrylamide copolymer provided by the present invention contains a structural unit A, a structural unit B and a structural unit C, wherein the structural unit A has the structure shown in formula (1), and the structural unit B has the structure shown in formula (2) , the structural unit C has a structure shown in formula (3), wherein n is an integer between 0-6; and based on the total weight of the acrylamide copolymer, the content of the structural unit A is 85 -95% by weight, the content of the structural unit B is 0.5-5% by weight, and the content of the structural unit C is 1-10% by weight. The acrylamide copolymer has high viscosity under the condition of high temperature and high salinity, and can lower the surface interfacial tension of oil and water, and has better emulsifying performance

Description

technical field [0001] The invention relates to the field of oilfield chemicals, in particular to an acrylamide copolymer and its preparation method and application. Background technique [0002] Polymer flooding technology is an important enhanced oil recovery technology. Its basic principle is to add water-soluble polymers to the injection water to increase the viscosity of the aqueous solution, reduce the water / oil mobility ratio, expand the swept volume, and increase the Sweep efficiency, reducing oil saturation in the swept zone, thereby enhancing oil recovery. Practice has proved that the use of polymer flooding can greatly improve oil recovery, resulting in huge economic and social benefits. For many years, the polymer used in polymer flooding is mainly artificially synthesized partially hydrolyzed polyacrylamide. The limitation of ordinary partially hydrolyzed polyacrylamide is its low temperature and salt resistance, and the viscosity of the aqueous solution drops...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F222/38C08F222/40C08F4/40C09K8/588
CPCC08F4/40C08F220/56C09K8/588
Inventor 赵方园伊卓杨捷王晓春
Owner CHINA PETROLEUM & CHEM CORP
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