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Preparation method of temperature-resistant salt-resistant polyacrylamide for oil displacement

A polyacrylamide, temperature-resistant and salt-resistant technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of large shearing of colloidal particles, decrease of molecular weight, uneven size of colloidal particles, etc., and achieve the production process Optimize, improve production efficiency, improve solubility and the effect of temperature and salt resistance

Active Publication Date: 2019-05-03
山东水衡浩正环保材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) When the hydrolysis agent is added, the temperature of the material is high and the size of the colloidal particles is uneven, and it becomes sticky before mixing evenly;
[0005] (2) Slow temperature rise and long hydrolysis time will greatly shear the colloidal particles, resulting in a decrease in molecular weight

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Put into the batching tank 1320kg of crystal acrylamide, 120kg of sodium acrylate aqueous solution with a mass concentration of 20%, 120kg of 2-acrylamide-2-methylpropanesulfonic acid, 30kg of urea, 30kg of polyethylene glycol 200, 60kg of thiourea, deionized Water 4320kg, start stirring and mixing, after the material is completely dissolved, add liquid caustic soda to adjust the pH value to 4.40, and complete the batching; turn on the refrigerant to cool the material to 3-5°C.

[0047] Transfer the prepared material into the polymerization kettle, add 120g of sodium formate, 240g of disodium edetate, 300g of azodiisopropyl imidazoline, and remove oxygen with nitrogen gas. After 30 minutes, add 125g of potassium persulfate, sulfurous acid Sodium hydrogen 60g, ammonium ferrous sulfate 10g, continue to pass nitrogen until the material becomes viscous, at this time the temperature of the system rises by 5°C, stop nitrogen, seal, and carry out polymerization reaction; the hi...

Embodiment 2

[0051] Put into the batching tank 1260kg of crystal acrylamide, 150kg of sodium acrylate aqueous solution with a mass concentration of 20%, 150kg of 2-acrylamide-2-methylpropanesulfonic acid, 25kg of urea, 45kg of polyethylene glycol 200, 75kg of thiourea, deionized 4305kg of water, start stirring and mixing, after the material is completely dissolved, add liquid caustic soda to adjust the pH value to 4.50, and complete the batching; turn on the refrigerant to cool the material to 3-5°C.

[0052] Transfer the prepared material into the polymerization kettle, add 125g of sodium formate, 240g of disodium edetate, 300g of azodiisopropylimidazoline, and remove oxygen with nitrogen gas. After 30 minutes, add 130g of potassium persulfate, sulfurous acid Sodium hydrogen 65g, ferrous ammonium sulfate 8g, continue to pass nitrogen until the material becomes viscous, at this time the temperature of the system rises by 5°C, stop nitrogen, seal, and carry out polymerization reaction; the h...

Embodiment 3

[0056]Put into the batching tank 1400kg of crystal acrylamide, 140kg of sodium acrylate aqueous solution with a mass concentration of 20%, 180kg of 2-acrylamide-2-methylpropanesulfonic acid, 30kg of urea, 60kg of polyethylene glycol 200, 80kg of thiourea, deionized Water 4110kg, start stirring and mixing, after the material is completely dissolved, add liquid alkali to adjust the pH value to 4.45, and complete the batching; turn on the refrigerant to cool the material to 3-5°C.

[0057] Transfer the prepared material into the polymerization kettle, add 125g of sodium formate, 240g of disodium edetate, 300g of azodiisopropylimidazoline, and remove oxygen with nitrogen gas. After 30 minutes, add 135g of potassium persulfate, sulfurous acid Sodium hydrogen 70g, ammonium ferrous sulfate 6g, continue to pass nitrogen until the material becomes viscous, at this time the temperature of the system rises by 5°C, stop nitrogen, seal, and carry out polymerization reaction; the highest tem...

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PUM

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Abstract

The invention provides a preparation method of temperature-resistant salt-resistant polyacrylamide for oil displacement. The preparation method comprises the following steps: sequentially adding acrylamide, a sodium acrylate water solution, 2-acrylamide-2-methylpropanesulfonic acid, a cosolvent, a high-temperature stabilizer and deionized water into a blending tank, starting stirring to uniformlymix the materials until the materials are completely dissolved, adjusting the pH value, and starting a refrigerant to cool the materials to 3-5 DEG C; pumping the cooled materials into a polymerization kettle, introducing nitrogen to remove oxygen, sequentially adding a chain transfer agent, a chelating agent, 2,2'-azobis[2-(2-imidazolin-2-yl)propane], an oxidizing agent and a reducing agent, stopping introducing the nitrogen after the solution is sticky, carrying out aging for 2 hours after a polymerization reaction is completed, and carrying out primary granulation, high-temperature dynamichydrolysis, secondary granulation, drying, crushing and screening to obtain the temperature-resistant salt-resistant polyacrylamide finished product. The temperature-resistant and salt-resistant polyacrylamide prepared by the invention has a high molecular weight and high viscosity, and has the characteristic of low degradation speed in a high-temperature high-mineralization environment.

Description

technical field [0001] The invention belongs to the field of water-soluble polymer synthesis, and in particular relates to a preparation method of heat-resistant and salt-resistant polyacrylamide for oil displacement. Background technique [0002] The main agent of tertiary oil recovery technology is polymer, and its principle is to enhance oil recovery by increasing the sweep coefficient of water. Under certain conditions, the oil displacement effect of polymer mainly depends on the performance of polymer. At present, partially hydrolyzed polyacrylamide is the most used main agent in tertiary oil recovery, but there are problems such as poor temperature resistance, poor salt resistance, and poor solubility in application. [0003] The post-homopolymerization hydrolysis process of polyacrylamide has stable polymerization and good repeatability, and can produce high molecular weight polyacrylamide products. However, the existing ordinary hydrolyzers have uneven mixing of hy...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F220/58C08F2/38C09K8/588
Inventor 牛爱辉
Owner 山东水衡浩正环保材料有限公司