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A kind of methoxypolyethylene glycol-polymethacrylate block copolymer and its preparation method and application

A technology of methoxypolyethylene glycol and polymethacrylic acid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of high viscosity of polysurfactant, difficulty in separating polysurfactant, and restriction of polysurfactant Large-scale application and other issues to achieve the effect of improving oil washing efficiency

Active Publication Date: 2020-07-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the high viscosity, strong emulsification performance and poor flow conductivity of ordinary surface-polymerizing agents, there are certain difficulties in the injection stage of surface-polymerizing agents and the separation of production fluid, which seriously restricts the large-scale application of surface-polymerizing agents.

Method used

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  • A kind of methoxypolyethylene glycol-polymethacrylate block copolymer and its preparation method and application
  • A kind of methoxypolyethylene glycol-polymethacrylate block copolymer and its preparation method and application
  • A kind of methoxypolyethylene glycol-polymethacrylate block copolymer and its preparation method and application

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preparation example Construction

[0029] According to a second aspect of the present invention, the present invention provides a method for preparing a methoxy polyethylene glycol-polymethacrylate block copolymer, the method comprising:

[0030] 1) under the protection of an inert gas, the bromine-terminated methoxypolyethylene glycol of the structure shown in formula (2) is used as a macroinitiator, the copper halide is used as a catalyst, and bipyridine is used as a catalyst ligand, and (3) The polymerized monomer of the shown structure (2-methyl-2-acrylate-2-(2-methoxyethoxy) ethyl ester, MEO 2 MA) carrying out atom transfer radical polymerization (ATRP) in an organic solvent to obtain a reaction solution;

[0031] 2) making the reaction solution contact with an oxygen-containing gas, thereby terminating the polymerization reaction; then removing the solvent therein to obtain an oily mixture;

[0032]

[0033] Wherein, n=4-200; the molar ratio of the macroinitiator to the polymerized monomer is 1:4-200....

Embodiment 1

[0059] This example is used to illustrate the block copolymer of the present invention and its preparation method.

[0060] The reaction flow chart is as figure 1 Shown:

[0061] (1) Preparation of macroinitiator (bromine-terminated methoxypolyethylene glycol)

[0062] In a completely dry three-necked flask, 5.5 g of mPEG was dissolved in 50 mL of tetrahydrofuran (THF), and an inert gas was passed, and 0.46 mL of triethylamine was added thereto. Then, the flask was placed in ice water at 0°C, and 0.82 mL of 2-bromoisobutyryl bromide was injected into the flask through a syringe. The reaction solution was magnetically stirred at room temperature for 24 hours, and an inert gas flow was maintained throughout the reaction to avoid oxygen. entry. After the precipitate produced in the reaction was removed by centrifugation, magnesium sulfate was added to remove the moisture in the remaining solution. Then the obtained clear solution was dripped dropwise into a large amount of he...

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Abstract

The invention belongs to the field of development of oil and gas fields and particularly provides methoxy polyethylene glycol-polymethacrylate block copolymers as well as a preparation method and an application thereof. The structures of the block copolymers are shown in formula (1), wherein n ranges from 4 to 200, and p ranges from 4 to 200. The block copolymers can be used as a polymer surfactant, have no crude oil solubilizing effect at the low temperature (lower than LCST (lower critical solution temperature)) and have smaller viscosity; with increasing of the temperature (higher than LCST), the viscosity gradually increases, the crude oil solubilizing effect of the surfactant is shown, and the oil scrubbing efficiency is improved.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to a methoxypolyethylene glycol-polymethacrylate block copolymer and its preparation method and application. Background technique [0002] Polymeric surface agent has high efficiency solubilization, high viscosity increase, good salt resistance, anti-oxidative degradation and anti-biodegradation and other properties. In recent years, Daqing Oilfield has researched surface-polymer flooding technology on the basis of functional polymers, and achieved good results. The polysurfactant widely used in oil fields is a new type of chemical injection agent produced by "grafting" various functional groups on polyacrylamide molecules. The surface-polymerizing agent combines the advantages of both polymers and surfactants. It combines the advantages of increasing viscosity and expanding the swept volume and improving the emulsifying ability or solubilizing ability of cr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F293/00C08F220/28C09K8/584
CPCC08F220/28C08F220/282C08F293/005C08F2438/01C09K8/584
Inventor 陈少华王友启吕成远伦增珉潘伟义卢刚贾红育周霞
Owner CHINA PETROLEUM & CHEM CORP
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