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Preparation method and application of acrylamide copolymer

An acrylamide copolymer and acrylamide copolymerization technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as inability to meet special oil reservoir requirements, poor temperature and salt resistance, etc.

Active Publication Date: 2020-10-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polymer prepared by this method has a molecular weight of only 19.5-20.5 million, and has poor temperature and salt resistance, which cannot meet the requirements of special oil reservoirs.

Method used

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  • Preparation method and application of acrylamide copolymer
  • Preparation method and application of acrylamide copolymer
  • Preparation method and application of acrylamide copolymer

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preparation example Construction

[0039] A preparation method of acrylamide copolymer, comprising the steps of:

[0040] (1) Weigh acrylamide and 2-acrylamido-2-methylpropanesulfonic acid and prepare an aqueous solution, adjust the pH value of the aqueous solution to 6-10 with sodium hydroxide or sodium carbonate, and blow in nitrogen for 30 minutes;

[0041] (2) Under the protection of nitrogen, add the weighed surfactant, active monomer, complexing agent and urea in sequence, place in a water bath at 25-40°C, stir to make it uniformly dispersed, and form a stable micellar solution;

[0042] Described tensio-active agent is sodium lauryl sulfate or sodium dodecylbenzenesulfonate;

[0043] Described active monomer is a kind of in the compound shown in formula (1) formula structure:

[0044]

[0045] In the formula, n is an integer of 1 to 8;

[0046] The total mass concentration of acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and active monomers in the aqueous solution is 5% to 15%. The total ma...

Embodiment 1

[0063] The method of the present embodiment comprises the steps:

[0064] 1. Add 11.8g acrylamide (59% by mass ratio) and 8.0g 2-acrylamido-2-methylpropanesulfonic acid (40% by mass ratio) into the polymerization reaction bottle (ie, the polymerization bottle), add Dissolve 60.0g of deionized water to make an aqueous solution, then add sodium hydroxide to adjust the pH to 6.0, and blow nitrogen gas for 30 minutes;

[0065] 2. Under nitrogen protection, add the weighed 0.2g sodium lauryl sulfate, 0.2g active monomer (n=1, mass ratio is 1%), 0.2g urea and 1.0g of 1% EDTA-2Na aqueous solution , placed in a 25°C water bath, stirred to disperse uniformly and form stable micelles;

[0066] 3. Put the polymerization reaction bottle into a constant temperature water bath at 25°C, then add 0.01g of initiator A (m=2) and 0.002g of initiator B, and continue to pass nitrogen until the polymerization is initiated and stop. Under the protection of nitrogen, the polymerization reaction 6 H...

Embodiment 2

[0070] The method of the present embodiment comprises the steps:

[0071] 1. Add 7.0g acrylamide (35% by mass ratio) and 12.0g 2-acrylamido-2-methylpropanesulfonic acid (60% by mass ratio) into the polymerization reaction bottle (ie, polymerization bottle), add Dissolve 60.0g of deionized water to make an aqueous solution, then add sodium hydroxide to adjust the pH to 7.0, and blow nitrogen gas for 30 minutes;

[0072] 2. Under nitrogen protection, add 1.0g of sodium lauryl sulfate, 1.0g of active monomer (n=1, mass ratio is 5%), 0.4g of urea and 1.0g of 1% EDTA-2Na aqueous solution , placed in a 40°C water bath, stirred to disperse uniformly and form stable micelles;

[0073] 3. Put the polymerization reaction bottle into a constant temperature water bath at 40°C, add 0.1 g of initiator A (m=2) and 0.02 g of initiator B, and continue to pass nitrogen until the polymerization is initiated and stop. Under the protection of nitrogen, the polymerization reaction is 8 Hour;

[...

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Abstract

The invention discloses a preparation method and application of an acrylamide copolymer, and the acrylamide copolymer with ultrahigh molecular weight is synthesized by copolymerization of acrylamide,2-acrylamido-2-methylpropanesulfonic acid and an active monomer by adopting a micelle polymerization process. According to the invention, free radicals can be generated through mild decomposition in micelles, the free radical concentration in a micelle system is always kept at a relatively low and stable concentration, so that acrylamide and comonomers can be slowly initiated, the whole polymerization reaction is stably carried out, the polymerization reaction speed can be effectively controlled, the polymerization temperature is slowly increased, and the generation of a high-molecular-weightacrylamide copolymer is facilitated. The polymerization reaction temperature is moderate, the polymerization reaction speed is stable, and crosslinking among molecular chains is greatly reduced, so that the copolymer is ensured to have good dissolving performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of oil recovery additives, and in particular relates to a preparation method of an acrylamide copolymer and an application thereof. Background technique [0002] Polymer flooding is a relatively mature tertiary oil recovery technology, which can increase the recovery rate by 8% to 15% compared with water flooding. However, polymers have inaccessible pore volumes (in the range of 5% to 30%) in the formation, which reduces the swept volume of polymer flooding, and polymer flooding does not have the ability to wash oil produced by low oil-water interfacial tension, so polymer flooding Binary flooding with polymers and surfactants is an efficient and economical chemical flooding method commonly used in domestic oilfields. During field tests, the problem of chromatographic separation of surfactants and polymers affects the oil enhancement effect of binary flooding. . [0003] Active polymers are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/54C08F4/00C09K8/584
CPCC08F220/56C08F4/00C09K8/584C08F220/585C08F220/54
Inventor 吕红梅王彪余晓玲崔永亮虞建业时冠兰
Owner CHINA PETROLEUM & CHEM CORP