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Branched hydrophobic associated polymer oil-displacing agent and preparation method thereof

A hydrophobic association, polymer technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of polymer shear resistance, temperature resistance and salt resistance, polymer molecular chain curling, etc. The water solubility of the polymer is reduced and other problems, so as to achieve the effect of good injection ability and fluidity control ability, improved salt resistance and high viscosity increasing ability.

Active Publication Date: 2014-06-11
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, too strong hydrophobic association will cause the molecular chains of the polymer to curl up, resulting in a decrease in the water solubility of the polymer or even precipitation (Yuan Rui. Molecular behavior and performance research of new chemical oil displacement agents [D]. Jinan: Shandong University, 2013 )
Therefore, polymers mainly composed of linear chains still cannot completely solve the shear resistance and temperature and salt resistance of polymers, and it is more important to seek a hydrophobically associated polymer with branches (ZL201210117149.9)

Method used

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  • Branched hydrophobic associated polymer oil-displacing agent and preparation method thereof
  • Branched hydrophobic associated polymer oil-displacing agent and preparation method thereof
  • Branched hydrophobic associated polymer oil-displacing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Weigh 2.619 grams of skeleton monomer and 1.437 grams of maleic anhydride into different beakers respectively, then add 20.16 grams and 8.09 grams of dimethyl sulfoxide to stir and dissolve evenly, and mix the skeleton with a molar ratio of 1:8 The dimethyl sulfoxide solution of the monomer is slowly added dropwise to the dimethyl sulfoxide solution of maleic anhydride, nitrogen gas is passed during the dropwise addition, and the system is placed in an ice-salt bath, and the skeleton monomer solution is added dropwise Afterwards, the stirring is continued until the temperature of the reaction liquid system no longer rises, and the functionalized skeleton monomer is obtained by repeated precipitation with chloroform.

[0047] Weigh 20 grams of acrylamide (AM), 5 grams of acrylic acid (AA), functionalized backbone monomers 0, 0.0125 grams, 0.025 grams, 0.0375 grams, 0.05 grams, 0.0625 grams, 0.075 grams, dimethylallyl-N - 0.8 grams of alkylammonium chloride and 74 grams o...

Embodiment 2

[0049] The functionalized backbone monomer was prepared as in Example 1.

[0050] Weigh 20 grams of acrylamide (AM), 5 grams of acrylic acid (AA), 0.05 grams of functionalized backbone monomers, 0.2 grams, 0.4 grams, 0.8 grams, and 1.2 grams of dimethylallyl-N-alkylammonium chloride . Each of 0.26 g of sodium, 0.052 g of chain transfer agent sodium methoxide, and 4.8 mg of oxidation-reduction initiator sodium bisulfite and ammonium persulfate were reacted for 8 hours to obtain five kinds of jelly-like polymers.

[0051] 2. Performance test of branched hydrophobic association polymer

[0052] Infrared spectra of functionalized backbone monomers see figure 1 . The figure shows: wave number 3432 (NH stretching vibration), 3089 (NH in-plane bending vibration), 2920 (CH 2 stretching vibration), 1737 (C=O stretching vibration), 1658 (C=O stretching vibration, C=C stretching vibration), 1020 (C-N stretching vibration), 955 (=C-H out-of-plane bending vibration), 708 (NH out-of-pla...

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Abstract

The invention discloses a branched hydrophobic associated polymer oil-displacing agent and a preparation method thereof. The polymer for oil displacement is copolymerized by acrylamide, sodium acrylate, hydrophobic monomer and functionalized skeleton monomer, wherein the hydrophobic monomer is dimethyl allyl-alkyl benzyl ammonium chloride, the functionalized skeleton monomer is formed by 2 substituted polyamide-amine dendrimer skeleton monomer or maleic anhydride or acrylic anhydride through reaction in dimethylsulfoxide solution. By using the branchedness of the polyamide-amine dendrimer skeleton, interaction between molecular chains is enhanced, and flexibility of molecules is lowered; by virtue of the association of hydrophobic group on the molecular chain in water solution, the tackifying capacity of low molecular weight polymer solution is improved; the preparation method has a reliable principle and is simple and convenient to operate, the synthesized polymer still has good tackifying capacity at high temperature, hypersalinity and strong shear action, thus having broad market prospect.

Description

technical field [0001] The invention relates to a branched hydrophobic association polymer oil displacement agent for enhancing oil recovery and a preparation method thereof, belonging to the field of polymer materials. Background technique [0002] Polyacrylamide (PAM) and partially hydrolyzed polyacrylamide (HPAM) are widely used polymers, which can be used as displacement agents, sewage flocculants, fracturing fluid additives in the petroleum industry, and can It can be used as sludge dewatering agent, and can be used as retention aid, filter aid, paper strengthening agent, etc. in the paper industry. It is one of the most widely used varieties in the synthesis of water-soluble polymers (Yuan Rui, Li Ying, Fang Hongbo et al. The Relationship between Molecular Configuration and Bulk Phase Behavior of Partially Hydrolyzed Hydrophobically Modified Polyacrylamide [J]. Acta Physicochemical Sinica. 2013,29(04):706-714). At present, the application of polyacrylamide in my count...

Claims

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Application Information

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IPC IPC(8): C09K8/588C08F290/06C08F220/56C08F220/06C08F226/02
CPCC08F290/065C09K8/588C08F220/56C08F220/06C08F226/02
Inventor 施雷庭朱珊珊刘丽娟李诚徐杰侯经洲叶仲斌
Owner SOUTHWEST PETROLEUM UNIV
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