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Branched polyacrylamide and preparation method thereof

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

Inactive Publication Date: 2012-09-19
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Synthesis of branched polyacrylamide

[0035] (1) Synthesis of branched functional monomer

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

[0037] (2) Synthesis of branched polyacrylamide

[0038] 1000g of acrylamide, 0.05g of branched functional monomer, dissolved in 4000g of distilled water, protected by n...

Embodiment 2

[0039] Example 2 Structural characterization of branched functional monomers

[0040] figure 1 It is the proton nuclear magnetic resonance spectrum of the synthesized branched functional monomer. 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 shift 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 (near 5.885 and 6.567).

[0042] From the analysis of the spectrum data, it is known that the product is a branched functional monomer.

Embodiment 3

[0043] Example 3 Characterization of the structure of branched polyacrylamide

[0044] figure 2 It is the infrared spectrum of branched polyacrylamide, which can be analyzed from the spectrum: 3430 cm -1 Is the hydroxyl stretching vibration peak, 2920 cm -1 Stretching vibration peak of methylene group, 1650cm -1 Is the amide and secondary amide stretching vibration peak; 1450 cm -1 There is the peak of hydrocarbon bending vibration; 1350 cm -1 It is the absorption peak of bending vibration produced by hydroxyl group.

[0045] Infrared spectroscopy analysis of various functional groups of the polymer showed that the synthesized polymer has 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 tackifier, daily chemicals, branched polyacrylamide used as tertiary oil recovery and displacing agent, and a preparation method thereof. Background technique [0002] The chemical flooding enhanced oil recovery technology based on polymer flooding has become mature in my country and has been widely used in oil fields such as Daqing and Shengli. It has become one of the main measures to improve oil recovery. Polymers are currently used for tertiary oil recovery. Mainly partially hydrolyzed polyacrylamide. [0003] With the increasingly demanding conditions of oilfield development, higher requirements are put forward on the performance of polymer solutions, requiring higher temperature resistance, salt resistance and shear resistance. Since the commonly used oil-displacing polymer is mainly long-chain linear polyacrylamide, although the viscosity of the polymer solution can be effectively increased by increasing the mol...

Claims

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Application Information

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Patent Type & Authority Applications(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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