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Water-soluble thermo-thickening copolymer, and preparation method and application thereof

A copolymer, water-soluble technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of not easily hydrolyzed, unable to effectively use temperature-resistant and salt-resistant polymer oil displacing agent, etc.

Active Publication Date: 2012-05-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat-thickening polymers currently reported cannot be effectively used in temperature-resistant and salt-tolerant polymer oil displacement agents because of the acrylate structural units contained in them. This is because the hydrolysis rate of the acrylate structural units is relatively high under high temperature and high-salt conditions. Therefore, how to prepare a polymer oil displacement agent with thermal thickening ability and not easily hydrolyzed under high temperature and high salt conditions is still an important issue in this field. undoubtedly of great significance

Method used

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  • Water-soluble thermo-thickening copolymer, and preparation method and application thereof
  • Water-soluble thermo-thickening copolymer, and preparation method and application thereof
  • Water-soluble thermo-thickening copolymer, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] This example is used to prepare the water-soluble thermally thickening copolymer of the present invention.

[0047] Add 35.1 grams of acrylamide, 25 grams of methoxypolyethylene glycol maleamide (the number average molecular weight is 5000, purchased from Aladdin company) and 150g deionized water, stir until acrylamide and methoxypolyethylene glycol maleamide dissolve completely, adjust the pH with 30% by weight of sodium hydroxide solution to be 9-11, adjust the initial temperature to be 15°C, While stirring, feed nitrogen for 60 minutes to remove dissolved oxygen, add 10 milliliters of 1% by weight of potassium persulfate solution and 10 milliliters of 0.5% by weight of urea solution as an initiator, heat up to 35°C and keep this temperature, and react for 5 hours , to obtain the water-soluble thermal thickening copolymer P1, the viscosity-average molecular weight of the water-soluble thermal thickening copolymer P1 is 9.52×10 6 , wherein the molar content of the acr...

Embodiment 2

[0053] This example is used to prepare the water-soluble thermally thickening copolymer of the present invention.

[0054] Add 50 grams of acrylamide, 10 grams of acrylic acid and 25 grams of methoxypolyethylene glycol maleamide (the number average molecular weight is 5000) in the four-port polymerization reactor equipped with stirrer, thermometer, air guide tube and reflux condenser And 130g deionized water, stir until acrylamide and methoxy polyethylene glycol maleamide are completely dissolved, adjust pH to be 9-10 with 30% by weight of sodium hydroxide solution, adjust initial temperature to be 15 ℃, stirring Simultaneously feed nitrogen for 60 minutes to remove dissolved oxygen, add 10 milliliters of 5% by weight of ammonium persulfate solution as an initiator, heat up to 50° C. and keep this temperature, and react for 6 hours to obtain a water-soluble heat-thickening copolymer P2. The viscosity-average molecular weight of the water-soluble thermal thickening copolymer P2...

Embodiment 3

[0058] This example is used to prepare the water-soluble thermally thickening copolymer of the present invention.

[0059] Add 22 grams of acrylamide, 5 grams of 2-acrylamide-2-methylpropanesulfonic acid (purchased from Shandong Union Chemical Company), 50 grams of methoxypolyethylene glycol maleamide (the number average molecular weight is 5000) and 300 g of deionized water, stirred until acrylamide and methoxypolyethylene glycol maleamide are completely dissolved, and oxidized with 30% by weight of hydrogen The sodium solution is adjusted to pH 10-11, and the initial temperature is adjusted to be 15°C. While stirring, feed nitrogen for 60 minutes to remove dissolved oxygen, add 5 milliliters of 1% by weight V50 solution as an initiator, heat up to 55°C and keep This temperature, reaction 2 hours, obtains water-soluble thermal thickening copolymer P3, the viscosity-average molecular weight of water-soluble thermal thickening copolymer P3 is 7.2 * 10 6 , wherein the molar con...

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Abstract

The invention provides a water-soluble thermo-thickening copolymer which is characterized in that: the copolymer comprises a constitutional unit (A) having a structure as represented by formula (1) and a constitutional unit (B) having a structure as represented by formula (2); on the basis of the total amount of constitutional units in the copolymer, the content of the constitutional unit (A) is 90 to 99.9 mol%, the content of the constitutional unit (B) is 0.1 to 10 mol%, number-average molecular weight of the constitutional unit (B) is 2000 to 5000, and viscosity-average molecular weight ofthe copolymer is 1*10<5> to 2*10<7>. Furthermore, the invention also provides a preparation method for the water-soluble thermo-thickening copolymer and application of the water-soluble thermo-thickening copolymer as a polymer flooding agent and a profile adjusting and water plugging agent. The water-soluble thermo-thickening copolymer provided in the invention still has excellent thermo-thickening performance under the conditions of high temperature and high salinity.

Description

technical field [0001] The invention relates to a water-soluble heat-thickening copolymer and its preparation method and application. Background technique [0002] As we all know, petroleum is a strategic energy source and an indispensable propellant for global economic development and social progress in the past 100 years. Due to its non-renewability and limited reserves, countries around the world have been actively researching and developing alternative energy sources for oil for many years. Although considerable progress has been made, oil will still be the source of world economic development in the foreseeable future. important material basis. my country is a country that is relatively scarce in oil resources. In order to ensure the demand for oil resources in national economic construction and development, my country has actively explored, researched and developed various technologies for enhancing oil recovery since the 1950s. After years of hard work, it has achie...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08G65/48C08F2/10C09K8/588C09K8/42
Inventor 王建宇祝纶宇吴江勇
Owner CHINA PETROLEUM & CHEM CORP
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