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Methoxy polyethylene glycol-polymethacrylate block copolymers as well as preparation method and application thereof

A technology of methoxy polyethylene glycol and polymethacrylic acid, which is applied in the directions of chemical instruments and methods, drilling compositions, etc. Problems such as poor flow conductivity, to achieve the effect of improving oil washing efficiency

Active Publication Date: 2018-04-03
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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  • Methoxy polyethylene glycol-polymethacrylate block copolymers as well as preparation method and application thereof
  • Methoxy polyethylene glycol-polymethacrylate block copolymers as well as preparation method and application thereof
  • Methoxy polyethylene glycol-polymethacrylate block copolymers as well as preparation method and application thereof

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preparation example Construction

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

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

[0031] 2) Contact the reaction solution with an oxygen-containing gas to terminate the polymerization reaction; then remove the solvent therein to obtain an oily mixture;

[0032]

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

[0034] In order to obtain a...

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 methoxy polyethylene 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 through, and 0.46 mL of triethylamine was added to it. Then, place the flask in ice water at 0°C, and inject 0.82 mL of 2-bromoisobutyryl bromide into the flask through a syringe. The reaction solution was magnetically stirred at room temperature for 24 hours, and inert gas was kept circulating during the entire reaction to avoid oxygen. Entry. After the precipitate produced in the reaction was removed by centrifugal separation, magnesium sulfate was added to remove the water in the remaining solution. Then, the resulting clear solution was dropped into a large amount of hexane solvent ...

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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 specifically relates to a methoxy polyethylene glycol-polymethacrylate block copolymer and a preparation method and application thereof. Background technique [0002] Polysurface agent has high-efficiency solubilization, high-efficiency viscosity-increasing, better salt resistance, anti-oxidation degradation and anti-biodegradation properties. In recent years, Daqing Oilfield has studied polysurface agent flooding technology on the basis of functional polymers, and achieved good results. At present, the polysurface agent widely used in oil fields is a new type of chemical injection agent produced by "grafting" various functional groups on the polyacrylamide molecule. Poly-surfactant combines the advantages of both polymer and surfactant. It combines the advantages of thickening and expanding the volume and improving the emulsification or solubilization ability of crude oil without alk...

Claims

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Application Information

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Patent Type & Authority Applications(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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