Branched polyacrylamide and preparation method thereof

A technology of polyacrylamide and acrylamide, which is applied in the preparation of carboxylic acid amide, chemical instruments and methods, and the preparation of organic compounds, etc., which can solve the problem of the decrease of the flow resistance of polymers, the loss of polymer solution viscosity, and the decrease of solution viscosity, etc. problems, to achieve excellent mechanical shear resistance, easy industrial production, and mild reaction conditions

Inactive Publication Date: 2013-11-27
SOUTHWEST PETROLEUM UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

Since the commonly used oil displacement polymers are mainly long-chain linear polyacrylamides, although the viscosity of the polymer solution can be effectively increased by increasing the molecular weight of the polymer, the polymer is still difficult to obtain during preparation, transportation, injection and Mechanical shear occurs during the process of flowing through the formation pore medium, causing long-chain polymer molecules to be sheared, resulting in a decrease in solution viscosity
Especially during the injection process of the polymer solution in the formation, due to the long action time, it will be severely sheared, which will have a more serious impact on the performance of the polymer solution, and directly lead to a decrease in the ability of the polymer to establish flow resistance in the formation , so that the oil displacement effect of the polymer solution is greatly reduced
Studies have shown that the viscosity loss of polyacrylamide solution can be as high as more than 90% after long-term mechanical shearing, and it cannot be recovered.
Especially under the environmental conditions of high temperature and high salt reservoirs, the phenomenon of viscosity loss of polymer solution caused by mechanical shear is more serious

Method used

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  • Branched polyacrylamide and preparation method thereof
  • Branched polyacrylamide and preparation method thereof
  • Branched polyacrylamide and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] The synthesis of embodiment 1 branched polyacrylamide

[0035] (1) Synthesis of branched functional monomers

[0036] Put a 1000ml single-necked round-bottom flask into an oil bath, add 0.1mol of diethylenetriamine and 0.5mol of methyl acrylate, dimethyl sulfoxide as a solvent, and react under uniform stirring in an ice bath for 6 hours, then add 1.0mol of The transesterification reaction of ethylenediamine occurred at 80°C. After 6 hours, a diaphragm vacuum pump was used to distill under reduced pressure for 4 hours, and all dimethyl sulfoxide and excess unreacted ethylenediamine were distilled out under reduced pressure. Then add 0.5 mol of maleic anhydride in dimethyl sulfoxide solution to the flask, heat to 80° C. and react for 6 hours, then distill off the dimethyl sulfoxide under reduced pressure to obtain a white branched functional monomer sample.

[0037] (2) Synthesis of branched polyacrylamide

[0038] Acrylamide 1000g, branched functional monomer 0.05g, di...

Embodiment 2

[0039] Structural characterization of embodiment 2 branched functional monomer

[0040] figure 1 It is the hydrogen nuclear magnetic resonance spectrum figure of the branched functional monomer synthesized, and the functional monomer uses D 2 O is dissolved, and TMS is used as an internal standard. In the target molecule, each hydrogen atom corresponds to the following:

[0041] The proton displacement δ is: methyl group (3.250), methylene group adjacent to amide group (around 3.407 and 3.628), methylene group adjacent to tertiary amine (2.773), CH 2 =CH double bond (around 5.885 and 6.567).

[0042] From the analysis of the spectrogram data, it can be seen that the product is a branched functional monomer.

Embodiment 3

[0043] The structural characterization of embodiment 3 branched polyacrylamide

[0044] figure 2 It is the infrared spectrum of branched polyacrylamide, and it is known from the analysis of the spectrum: 3430 cm -1 is the hydroxyl stretching vibration peak, 2920 cm -1 The stretching vibration peak of methylene, 1650cm -1 is the stretching vibration peak of amide and secondary amide; 1450 cm -1 is the hydrocarbon bending vibration peak; 1350 cm -1 is the bending vibration absorption peak generated by the hydroxyl group.

[0045] Various functional groups of the polymer were analyzed by infrared spectroscopy, and the results showed that the synthesized polymer had the characteristics of branched polyacrylamide.

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Abstract

The invention relates to a branched polyacrylamide and a preparation method thereof. The preparation method of the branched polyacrylamide comprises the following steps: carrying out addition reaction on diethylenetriamine and methyl acrylate in a dimethyl sulfoxide solvent, adding excessive ethylenediamine, heating to react, removing dimethyl sulfoxide and excess ethylenediamine, and adding maleic anhydride to generate a branched functional monomer; and carrying out polymerization reaction on the branched functional monomer and an acrylamide monomer, thereby preparing the branched polyacrylamide. The polymer has obvious tackifying property and mechanical shearing resistance; and the preparation method has the advantages of reliable principle and mild reaction conditions, is simple to operate, is hopeful to be used in the fields of gas field operating fluids, daily supplies, dyes, medicines, new materials and the like, and has broad market prospects.

Description

technical field [0001] The invention relates to a water-soluble viscosifier, daily chemicals, branched polyacrylamide used as an oil displacement agent for tertiary oil recovery and a preparation method thereof. Background technique [0002] The enhanced oil recovery technology of chemical flooding mainly based on polymer flooding has become mature in my country, and has been widely used in Daqing, Shengli and other oil fields, and has become one of the main measures to enhance oil recovery. Mainly partially hydrolyzed polyacrylamide. [0003] With the increasingly harsh oilfield development conditions, higher requirements are put forward for the performance of polymer solutions, which require polymer solutions to have higher temperature resistance, salt resistance and shear resistance. Since the commonly used oil displacement polymers are mainly long-chain linear polyacrylamides, although the viscosity of the polymer solution can be effectively increased by increasing the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F222/38C07C237/10C07C231/02
Inventor 陈洪叶仲斌韩利娟罗平亚杨琼邹影
Owner SOUTHWEST PETROLEUM UNIV
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