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Novel heat-resistant salt-resistant polyacrylamide and synthesis method thereof

A polyacrylamide, temperature-resistant and salt-resistant technology, which is applied in the field of new temperature-resistant and salt-resistant polyacrylamide and its synthesis. Oil displacement ability and other issues, to achieve the effect of ensuring shear degradation and temperature resistance, and improving salt resistance

Inactive Publication Date: 2019-01-04
TIANJIN BO HONG CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, polyacrylamide is mainly used for polymer flooding. Due to the salt-sensitive effect of ordinary polyacrylamide for oil flooding, its solubility becomes poor at high salinity, and its viscosity becomes low. Requirements
Moreover, a rapid hydrolysis reaction will occur under the condition of acid, alkali or temperature exceeding 70°C, resulting in the curling of polyacrylamide molecular chains, and even precipitation and loss of oil displacement ability

Method used

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  • Novel heat-resistant salt-resistant polyacrylamide and synthesis method thereof

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Experimental program
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Effect test

Embodiment 1

[0015] Add 739.8g of distilled water to a 1L jar, then add 7g of caustic soda sodium hydroxide, dissolve evenly, slowly add 50g of functional monomer AMPS, dissolve completely in a constant temperature water bath below 15°C, then add 0.5g of vinylpyrrolidone, stir well and then add Refined 200g of acrylamide monomer AM, adjusted the pH value to 12, then added 1g of sodium chloride, 1.5g of urea and cooled down to -2°C; moved it into a Dewar bottle, and passed 99.999% high-purity nitrogen to deoxygenate for 10min , add 0.01g of EDTA, continue to pass nitrogen gas for deoxygenation for 20min, then add 0.2g of azobisisoheptanonitrile, and then pass nitrogen gas for deoxygenation for 20min, then add 0.002g of tert-butyl hydroperoxide, and then add ferrous ammonium sulfate 0.01 g, then continue to pass nitrogen until the solution becomes viscous and then seal.

[0016] After the temperature of the solution rises to the highest value and cools down naturally for 2 hours, take out th...

Embodiment 2

[0018] First add 771.3g of distilled water to a 1L jar, then add 10g of granular alkali sodium hydroxide, and slowly add 35g of functional monomer AMPS after dissolving evenly. Refined 180g of acrylamide monomer AM, adjusted the PH value to 12.5, then added 1.5g of sodium chloride, 1g of urea and cooled down to 0°C; moved it into a Dewar bottle, and passed 99.999% high-purity nitrogen to remove oxygen for 10 minutes, Add 0.05g of EDTA, continue to pass nitrogen gas for deoxygenation for 20 minutes, then add 0.15 g of azobisisoheptanonitrile, and then pass nitrogen gas for deoxygenation for 20 minutes, then add 0.004 g of tert-butyl hydroperoxide, and then add ferrous ammonium sulfate 0.008 g after 2 minutes , and then continue to pass nitrogen until the solution becomes viscous and then seal.

[0019] After the temperature of the solution rises to the highest value and cools down naturally for 2 hours, take out the colloid from the Dewar bottle, granulate it into particles wit...

Embodiment 3

[0021] First add 771.3g of distilled water to a 1L jar, then add 10g of granular alkali sodium hydroxide, and slowly add 35g of functional monomer AMPS after dissolving evenly. Refined 180g of acrylamide monomer AM, adjusted the pH value to 12.2, then added 1.5g of sodium chloride, 1g of urea and cooled down to -1°C; moved it into a Dewar bottle, and passed 99.999% high-purity nitrogen to remove oxygen for 10 minutes , add 0.05g of EDTA, continue nitrogen deoxygenation for 20min, then add 0.15g of azobisisoheptanonitrile, then add 0.004g of tert-butyl hydroperoxide after nitrogen deoxygenation for 20min, then add ferrous ammonium sulfate 0.008 g, then continue to pass nitrogen until the solution becomes viscous and then seal.

[0022] After the temperature of the solution rises to the highest value and cools down naturally for 2 hours, take out the colloid from the Dewar bottle, granulate it into particles with a diameter of 3-5mm, take out 100g of the granulated colloid parti...

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Abstract

The invention provides novel heat-resistant salt-resistant polyacrylamide and a synthesis method thereof. Polyacrylamide structurally includes sulfonic acid radicals and pyrrolidone radicals, the salt-resistant performance of heat-resistant salt-resistant polyacrylamide reaches 20,000 degrees of mineralization, the total number of calcium and magnesium ions reaches 504 mg / L, and the temperature reaches 85 DEG C. The synthesis method includes the following steps of firstly, in a redox and azo compounding trigger system, refined acrylamide monomers (AM), functional monomers AMPS and vinylpyrrolidone react under the trigger temperature of -2-0 DEG C to obtain glue; secondly, pelleting, hydrolysis, drying, smashing and sieving are carried out. Under the ultralow temperature, the redox and azocompounding trigger system is adopted for polymerization, sulfonic acid radical strong water groups and pyrrolidone radicals are introduced into polyacrylamide, a self-made mixed stabilizer is added during hydrolysis, and not only is the salt-resistant capability of polyacrylamide improved, but also ultra-high molecular weight shear degradation and heat-resistant performance are ensured.

Description

technical field [0001] The invention relates to the technical field of polymer compounds, in particular to a novel temperature-resistant and salt-resistant polyacrylamide and a synthesis method thereof. Background technique [0002] Three-element oil recovery technologies such as polymer flooding, binary compound flooding (alkali-polymer), and three-element compound oil flooding (alkali-surfactant-polymer) have been widely used and achieved significant oil increase. Precipitation effect and good economic benefits. Among them, polyacrylamide is mainly used for polymer flooding. Due to the salt-sensitive effect of ordinary polyacrylamide for oil flooding, its solubility becomes poor at high salinity, and its viscosity becomes low. Requirements. Moreover, a rapid hydrolysis reaction will occur under the condition of acid, alkali or temperature exceeding 70°C, resulting in the curling of polyacrylamide molecular chains, and even precipitation and loss of oil displacement abili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F226/10
CPCC08F220/56C08F220/585C08F226/10
Inventor 李元军李雷振刘存辉王欢李靖庞玉山石昀李才雄赵东旭范翠杰胡良义刘洁吴海宁李玉亮孙凤萍郑伟毛艳妮刘广斌蓝海宽霍艳玲马亮朱卓岩
Owner TIANJIN BO HONG CHEM
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