Acrylamide copolymer oil-dispelling agent with sulfitobetaine structure and synthesis method

A technology of acrylamide copolymerization and sulfite, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of temperature resistance, shear dilution resistance and poor solubility, and achieve enhanced oil recovery and good oil recovery. Salt resistance, water solubility improvement effect

Inactive Publication Date: 2015-03-11
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first object of the present invention is to provide a water-soluble acrylamide polymer oil-displacing agent containing sulfite betaine structure, which solves the problem of poor temperature resistance, salt resistance, shear dilution resistance and solubility of existing oil-displacing agents The problem

Method used

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  • Acrylamide copolymer oil-dispelling agent with sulfitobetaine structure and synthesis method
  • Acrylamide copolymer oil-dispelling agent with sulfitobetaine structure and synthesis method
  • Acrylamide copolymer oil-dispelling agent with sulfitobetaine structure and synthesis method

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Experimental program
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Embodiment 1

[0043] The synthesis of embodiment one monomer MAPES

[0044] The synthetic method of monomer 2-(3-methacrylamidopropyl dimethylamino) ethyl sulfite inner salt (MAPES) is as follows:

[0045] (1) Add a certain quality of N-(3-dimethylaminopropyl)methacrylamide, 1,4-dioxane and a small amount of hydroquinone into a 250mL three-necked flask;

[0046](2) After heating the temperature to the reflux temperature, slowly add a certain amount of vinyl sulfite dropwise to the flask under constant stirring;

[0047] (3) After vinyl sulfite has been added dropwise, react at reflux temperature for 2 to 5 hours;

[0048] (4) After the reaction is completed, the solvent is removed by rotation, recrystallized with acetonitrile, and the product obtained is vacuum-dried to obtain the inner salt of 2-(3-methacrylamidopropyldimethylamino)ethylsulfite in the form of white powder.

[0049] The volume ratio of N-(3-dimethylaminopropyl)methacrylamide to 1,4-dioxane is 1:1-2, wherein 1,4-dioxane is...

Embodiment 2

[0052] Synthesis of embodiment two polymer oil displacement agent AM / AA / MAPES

[0053] The synthetic method of polymer oil displacement agent AM / AA / MAPES is specifically as follows:

Embodiment 3

[0069] The structural characterization of embodiment three monomer MAPES

[0070] The sample prepared in Example 1 was analyzed structurally by infrared spectrum, and the structure of monomer MAPES was characterized by WQF-510A Fourier Transform Infrared Spectrometer by KBr tablet method, and the infrared spectrum was as follows figure 1 shown. from figure 1 It can be seen: 3410.4cm -1 H after moisture absorption of the monomer 2 Stretching vibration absorption peak of —OH in O; 1642.5cm -1 It is the stretching vibration absorption peak of C=O, 1621.9cm -1 It is the stretching vibration absorption peak of C=C; 1384.6cm -1 for CH 3 The bending vibration absorption peak of C—H in middle; 1206.3cm -1 It is the stretching vibration absorption peak of C—N; 1082.8cm -1 、1042.3cm -1 For—OSO 2 Stretching vibration absorption peak of S=O in middle; 619.1cm -1 It is the bending vibration absorption peak of N—H in amides. The structure of the sample was consistent with that o...

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Abstract

The invention discloses an acrylamide copolymer with a sulfitobetaine structure and a synthesis method of a monomer with a sulfitobetaine structure. The acrylamide copolymer is composed of the following monomers in parts by weight: 55 to 75 parts of acrylamide, 24 to 38 parts of acrylic acid, and 1 to 7 parts of 2-(3-methylacrylamidepropyldimethylamino)ethyl sulfurous acid inner salts, and is synthesized in the presence of an initiator namely 0.1 to 0.5 part of NaSO3-(NH4)2S2O8 in a water solution with a pH value of 5 to 9 at a temperature of 30 to 40 DEG C for 6 to 10 hours. The monomer with a sulfitobetaine structure is prepared by carrying out reflux reactions between 1 part of N-(3-dimethylaminopropyl)methacrylamide and 1 to 1.2 parts of ethylene sulfite in 1,4-dioxane for 2 to 5 hours.

Description

technical field [0001] The invention relates to an acrylamide copolymer oil-displacing agent containing a sulfite betaine structure, which is used for oil displacement in oilfields of the petroleum industry to enhance crude oil recovery, and a synthesis method thereof. Background technique [0002] In the process of oil extraction, polymer flooding is an important method of enhancing oil recovery. It achieves the purpose of enhancing oil recovery by injecting high molecular weight water-soluble polymer solution into the oil reservoir. As one of the main means of enhancing oil recovery, polymer flooding has a clear mechanism of oil displacement, which is to reduce the mobility of the aqueous phase, improve the mobility ratio, and increase the sweep coefficient. Since the mechanism of polymer flooding is clear and the technology is relatively simple, the research on it started in the late 1950s and early 1960s in various countries around the world. The first polymer flooding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/60C08F4/40C09K8/588
Inventor 苟绍华何杨周利华张勤赵鹏敬东罗珊
Owner SOUTHWEST PETROLEUM UNIV
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