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A water-soluble oil displacement polymer with rigid core-shell structure and its preparation method

A technology of oil displacement polymer and shell structure, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of slow polymer dissolution, poor temperature resistance, poor salt resistance, etc., and achieve good anti-corrosion Shear properties, effects of good thermal stability

Inactive Publication Date: 2017-10-13
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical application, polyacrylamide has many disadvantages: poor temperature resistance, poor salt resistance, carboxyl group is very sensitive to salt, polymer with high molecular weight has slow dissolution rate, and is easy to shear and degrade
However, the structure of the dendrimers currently used in oil fields is that the main chain and the side chains are linear polymers with flexibility, and the properties of the entire polymer molecule are jointly provided by the main chain and the side chains. Limited improvement in oil performance

Method used

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  • A water-soluble oil displacement polymer with rigid core-shell structure and its preparation method
  • A water-soluble oil displacement polymer with rigid core-shell structure and its preparation method
  • A water-soluble oil displacement polymer with rigid core-shell structure and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Example 1: A water-soluble oil displacement polymer with a rigid core-shell structure:

[0030] The branched polyamide-amine backbone monomer with 2,4-diacetyl-3-(4-bromophenyl)diethyl glutarate as the core and maleic anhydride in a molar ratio of 1:0.8, Dissolve in dimethyl sulfoxide respectively to prepare a skeleton monomer solution and a maleic anhydride solution with a mass concentration of 0.095%. The skeleton monomer solution is slowly added dropwise to the maleic anhydride solution. During the dripping process Blow nitrogen through, and place the reaction system in an ice-salt bath. When the color of the solution gradually changes from dark yellow to brown, test the pH at about 4.5-5.5, stop the dripping, continue stirring for 5 hours and then stop, use chloroform Repeated washing and filtering reaction product to obtain functionalized skeleton monomer; image 3 As shown, it is a macromolecule synthesized with a rigid structural group as the core, and the peripher...

Embodiment 2

[0032] Example 2: A water-soluble oil displacement polymer with a rigid core-shell structure:

[0033] The branched polyamide-amine backbone monomer with 2,4-diacetyl-3-(4-bromophenyl)diethyl glutarate as the core and maleic anhydride in a molar ratio of 1:1.9, Dissolve them in dimethyl sulfoxide to prepare a skeleton monomer solution and a maleic anhydride solution with a mass concentration of 1%. The skeleton monomer solution is slowly added dropwise to the maleic anhydride solution. During the dropping process Blow nitrogen through, and place the reaction system in an ice-salt bath. When the color of the solution gradually changes from dark yellow to brown, test the pH at about 4.5-5.5, stop the dripping, continue stirring for 4.5 hours and then stop, use chloroform Repeated washing and filtering reaction products to obtain functionalized skeleton monomers;

[0034] To synthesize a water-soluble oil displacement polymer with a rigid core-shell structure: weigh the following par...

Embodiment 3

[0035] Example 3: A water-soluble oil displacement polymer with a rigid core-shell structure:

[0036] The branched polyamide-amine backbone monomer with 2,4-diacetyl-3-(4-bromophenyl)diethyl glutarate as the core and maleic anhydride in a molar ratio of 1:1.2, Dissolve in dimethyl sulfoxide respectively to prepare a skeleton monomer solution and a maleic anhydride solution with a mass concentration of 0.098%. The skeleton monomer solution is slowly added dropwise to the maleic anhydride solution. During the process, nitrogen is blown and the reaction system is placed in an ice-salt bath. When the color of the solution gradually changes from dark yellow to brown, the test pH is about 4.5-5.5, stop the dripping, continue stirring for 4 hours and then stop. The reaction product was washed and filtered repeatedly with chloroform to obtain a functionalized skeleton monomer;

[0037] To synthesize a water-soluble oil displacement polymer with a rigid core-shell structure: weigh the fol...

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Abstract

The invention provides a water-soluble oil-displacing polymer with a rigid core-shell structure, comprising a copolymer of acrylamide, sodium acrylate, dimethylallyl-p-alkylbenzyl ammonium chloride and functionalized backbone monomers, Average molecular weight is 7,000,000, and structure is as shown in I; Also provide above-mentioned polymer preparation method: branched polyamidoamine skeleton monomer solution is added dropwise in maleic anhydride solution, feed nitrogen simultaneously, in ice salt Reaction in the bath to obtain the functionalized skeleton monomer; then weigh the following raw materials in parts by weight: 14.3-20.5 parts of acrylic acid, 56.16-72.2 parts of acrylamide, 1.0-1.74 parts of dimethyl allyl-p-alkylbenzyl chloride Ammonium and 0.05-0.16 parts of functionalized backbone monomers, adding co-solvent, chain transfer agent and redox initiator, and reacting at 45-55°C for 5-9 hours at a constant temperature. The polymer of the invention has large molecular weight, high viscosity, good thermal stability and shear resistance.

Description

Technical field [0001] The invention belongs to the field of polymer materials, and relates to an oil-displacing polymer and a preparation method thereof, in particular to a water-soluble oil-displacing polymer with a rigid core-shell structure used for oil displacement in oil and gas fields to increase oil recovery and preparation thereof method. Background technique [0002] As an important strategic resource, the supply of oil and natural gas has become the main bottleneck restricting my country's national economic and social development, and directly affects national security, and plays an important role in the country's economic development and the improvement of people's living standards. With the deepening of exploration and development, the difficulty of extraction will gradually increase. Therefore, improving oil recovery is not only an issue of general concern to the petroleum industry, but also the entire industry. [0003] At present, most oilfield blocks have entered ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C08F220/56C08F220/06C08F226/02C08F4/40C09K8/588
Inventor 施雷庭侯经洲叶仲斌陈文高源陈洪舒政
Owner SOUTHWEST PETROLEUM UNIV
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