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Temperature-resistant anionic-nonionic amphoteric hydrophobically associating copolymer and preparation method thereof

A technology of hydrophobic association and copolymer, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem of increasing formation adsorption and oil displacement loss, increasing polymer adsorption and loss, Poor temperature and salt resistance, etc., to achieve the effects of good compatibility, less adsorption, and low shear resistance

Active Publication Date: 2015-09-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(1) Highly harmful. At present, polymers commonly used in oil fields leave residues in the formation after the completion of operations, which will damage the formation to a certain extent.
(2) Poor compatibility with the formation. Nowadays, cationic polymers and anionic and cationic amphoteric polymers are more studied. Because the formation is often negatively charged, the adsorption and loss of the polymer in the formation increase.
(3) Poor temperature and salt resistance With the exploitation of unconventional oil and gas resources, high-temperature or high-salt formations have entered a period of substantial exploitation, and the temperature and salt resistance of modified polymers needs to be further strengthened
After the cationic polymer is added to the oil displacement agent, due to the negative charge of the reservoir formation, after the oil displacement agent enters the formation, the adsorption amount of the formation and the loss of the oil displacement agent will increase, and the oil displacement efficiency will become lower.

Method used

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  • Temperature-resistant anionic-nonionic amphoteric hydrophobically associating copolymer and preparation method thereof
  • Temperature-resistant anionic-nonionic amphoteric hydrophobically associating copolymer and preparation method thereof
  • Temperature-resistant anionic-nonionic amphoteric hydrophobically associating copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A temperature-resistant anion-non-amphiteric hydrophobic association copolymer, which is formed by copolymerizing 10g of monomer A, 1g of monomer B and 0.1g of monomer C, monomer A is acrylamide, and monomer B is 2-acrylamide -2-methyl propane sulfonate (AMPS), the monomer C is octadecyl polyoxyethylene methacrylate (OEMA).

[0042] The average molecular weight of the temperature-resistant anisotropic non-amphiteric hydrophobic association copolymer is 1.2 million.

[0043] Preparation:

[0044]1) Weigh 10g of acrylamide (AM), 1g of 2-acrylamide-2-methylpropanesulfonate (AMPS) and 0.1g of octadecyl polyoxyethylene methacrylate (OEMA), dissolve them in 25ml of distilled water, Prepare a mixed solution;

[0045] 2) adding hydrochloric acid with a concentration of 30wt% to adjust the pH value of the mixed solution to 4,

[0046] 3) Add 2.5g sorbitan stearate (Span-60) and 0.3g polyoxyethylene sorbitan monooleate (Tween-80) and 40g cyclohexane to the mixed solution after...

Embodiment 2

[0049] A temperature-resistant, non-amphiphoteric hydrophobic associative copolymer, which is formed by copolymerizing 10g of monomer A, 0.8g of monomer B and 0.08g of monomer C, monomer A is acrylamide, and monomer B is vinyl sulfonate salt, and the monomer C is octadecyl polyoxyethylene methacrylate (OEMA).

[0050] The average molecular weight of the temperature-resistant anisotropic non-amphiteric hydrophobic association copolymer is 1.5 million.

[0051] Preparation:

[0052] 1) Weigh 10g of acrylamide, 0.8g of vinyl sulfonate and 0.08g of octadecyl polyoxyethylene methacrylate (OEMA), and dissolve them in 25ml of distilled water to prepare a mixed solution;

[0053] 2) adding hydrochloric acid with a concentration of 30wt% to adjust the pH value of the mixed solution to 5,

[0054] 3) Add 2.8g sorbitan stearate (Span-60) and 0.2g polyoxyethylene sorbitan monooleate (Tween-80) and 40g cyclohexane to the mixed solution after adjusting the pH value to obtain a mixture , ...

Embodiment 3

[0057] A temperature-resistant anion-non-amphiteric hydrophobic association copolymer, which is formed by copolymerizing 10g of monomer A, 1.2g of monomer B and 0.12g of monomer C, monomer A is acrylamide, and monomer B is 2-propylene Amide-2-methylpropane sulfonate (AMPS), the monomer C is octadecyl polyoxyethylene methacrylate (OEMA).

[0058] The average molecular weight of the temperature-resistant anisotropic non-amphiteric hydrophobic association copolymer is 1.2 million.

[0059] Preparation:

[0060] 1) Weigh 10g of acrylamide, 1.2g of 2-acrylamide-2-methylpropanesulfonate (AMPS) and 0.12g of octadecyl polyoxyethylene methacrylate (OEMA), dissolve them in 25ml of distilled water, and obtain mixture;

[0061] 2) adding hydrochloric acid with a concentration of 30wt% to adjust the pH value of the mixed solution to 6,

[0062] 3) Add 3.2g sorbitan stearate (Span-60) and 0.18g polyoxyethylene sorbitan monooleate (Tween-80) and 40g cyclohexane to the mixed solution after...

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Abstract

The invention relates to a temperature-resistant anionic-nonionic amphoteric hydrophobically associating copolymer and a preparation method thereof. The temperature-resistant anionic-nonionic amphoteric hydrophobically associating copolymer is prepared by copolymerizing a monomer A, a monomer B and a monomer C, wherein the weight ratio of the monomer A to the monomer B to a monomer C is 10: (0.5-1.5): (0.05-0.15); the monomer A is acrylamide; the monomer B is 2-acrylamido-2-methyl propane sulfonate (AMPS), alpha-alkenyl sulphonate or vinyl sulfonate; the monomer C is poly(ethylene glycol) octadecyl methacrylate (OEMA). With a sulfonic acid group, the copolymer has excellent water solubility and temperature resistance; meanwhile, with a non-ionic hydrophobic unit, the copolymer has unique shear resistance and viscosifying ability; the copolymer has excellent performance, has a wide application prospect in the oil and gas resource exploitation under high temperature, high salt, low permeability, and can be used in an oil field displacement agent and a fracturing fluid thickener.

Description

technical field [0001] The invention relates to a temperature-resistant anisotropic non-amphiphore hydrophobic association copolymer for oil fields and a preparation method thereof, belonging to the technical field of oil and gas field development and production engineering. Background technique [0002] Hydrophobic association polymer refers to a water-soluble polymer with a small amount of hydrophobic groups on the hydrophilic macromolecular chain of the polymer. Its solution has unique properties. In aqueous solution, the hydrophobic groups of such polymers are aggregated due to hydrophobic interaction, causing intramolecular and intermolecular associations of macromolecular chains. Due to the hydrophobic effect of the hydrophobic group, the hydrophobic polyacrylamide copolymer produces intermolecular association in aqueous solution, thus having unique rheological properties. It is a hot spot in the development of polymers today. Its main advantage is that it has a unique...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F228/02C08F220/32C09K8/588
Inventor 李兆敏张昀李宾飞李松岩吕其超刘己全李忠鹏
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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