Check patentability & draft patents in minutes with Patsnap Eureka AI!

Sulfated cellulose ether-acrylamide graft copolymer, preparation method and application thereof

A technology of sulfated cellulose and graft copolymers, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of compound system oil displacement efficiency decline, poor compatibility, "chromatographic separation, etc., and achieve reduction Oil-water interfacial tension, safe use, and the effect of improving oil displacement efficiency

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
View PDF7 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in field experiments of tertiary oil recovery using chemical composite flooding technology, surfactants and polymers often have the disadvantage of poor compatibility. "separation" phenomenon, resulting in a significant drop in the oil displacement efficiency of the compound system

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Sulfated cellulose ether-acrylamide graft copolymer, preparation method and application thereof
  • Sulfated cellulose ether-acrylamide graft copolymer, preparation method and application thereof
  • Sulfated cellulose ether-acrylamide graft copolymer, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In the first step, 3.0 g of sodium cellulose sulfate (substitution degree is 0.39) and 3.8 g of 1-bromododecane (0.015 mol) are dissolved in 150 ml of N, N-dimethylformamide, and added to the Add 0.5 g of sodium hydroxide to a three-necked flask with a stirrer and a thermometer, and stir and react at 90° C. for 5 h. After the reaction was completed, cool to room temperature, add 200ml of ethanol for precipitation, filter and isolate the crude product, recrystallize the product with ethanol, and vacuum dry the purified product at 50°C to obtain sulfated cellulose lauryl ether.

[0030] In the second step, add 4.0 g of sulfated cellulose lauryl ether and 50 ml of distilled water into a three-necked flask equipped with a stirrer, a thermometer, and a nitrogen pipe, feed in nitrogen, and stir for 30 minutes until completely dissolved. At 40°C, add 0.9 ml of ammonium persulfate aqueous solution with a concentration of 1 mg / ml and 1.6 ml of a sodium sulfite aqueous solution w...

Embodiment 2

[0038] The 1st step, cellulose sodium sulfate (substitution degree is 0.39) 3.0g and the 1-bromononane (0.015mol) of 3.1g are dissolved in the N of 150ml, in the N-dimethylformamide, join with Add 0.45 g of sodium hydroxide to a three-necked flask with a stirrer and a thermometer, and stir and react at 90° C. for 6 h. After the reaction was completed, cool to room temperature, add 200ml of ethanol for precipitation, filter and isolate the crude product, recrystallize the product with ethanol, and dry the purified product in vacuum at 50°C to obtain sulfated cellulose nonyl ether.

[0039] In step 2, add 4.0 g of sulfated cellulose nonyl ether and 50 ml of distilled water into a three-necked flask equipped with a stirrer, a thermometer, and a nitrogen pipe, feed in nitrogen, and stir for 30 minutes until completely dissolved. At 30°C, add 0.9 ml of ammonium persulfate aqueous solution with a concentration of 1 mg / ml and 1.6 ml of a sodium sulfite aqueous solution with a concent...

Embodiment 3

[0042] The 1st step, cellulose sodium sulfate (substitution degree is 0.39) 3.0g and 3.4g of 1-bromodecane (0.015mol) are dissolved in the N of 150ml, in the N-dimethylformamide, join with Add 0.5 g of sodium hydroxide to a three-necked flask with a stirrer and a thermometer, and stir and react at 85° C. for 5 h. After the reaction was completed, cool to room temperature, add 200ml of ethanol for precipitation, filter and separate to obtain the crude product, recrystallize the product with ethanol, and vacuum-dry the purified product at 50°C to obtain sulfated cellulose decyl ether.

[0043] In the second step, add 4.0 g of sulfated cellulose decyl ether and 50 ml of distilled water into a three-necked flask equipped with a stirrer, a thermometer, and a nitrogen pipe, feed nitrogen, and stir for 30 minutes until completely dissolved. At 35°C, add 0.9 ml of ammonium persulfate aqueous solution with a concentration of 1 mg / ml and 1.6 ml of a sodium sulfite aqueous solution with ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to an oil displacement agent sulfated cellulose ether-acrylamide graft copolymer in tertiary oil recovery, a preparation method and an application thereof. In the preparation method, long-chain alkyl is introduced to a cellulose chain segment of sodium cellulose sulfate; the cellulose chain segment of sodium cellulose sulfate is subjected to hydrophobic modification to obtain sulfated cellulose ether; the sulfated cellulose ether is subjected to graft polymerization with acrylamide to obtain the sulfated cellulose ether-acrylamide graft copolymer with a structural formula in the specification. The prepared macromolecular surfactant sulfated cellulose ether-acrylamide graft copolymer has high surface activity and high viscosity increasing property, is used as an oil displacement agent in tertiary oil recovery, and has the effects of the polymer in enlarging waves and coefficients and the effect of the surfactant in reducing oil-water interfacial tension, so that the problem of chromatographic fractionation effect of current polymer-surfactant combination flooding can be solved, and the oil displacement efficiency is improved. The product can be either independently used as an oil displacement agent, or compounded with alkali or a polymer.

Description

technical field [0001] The invention relates to an oil field oil displacement agent and its synthesis, in particular to a sulfated cellulose ether-acrylamide graft copolymer of an oil displacement agent for tertiary oil recovery and a preparation method thereof. [0002] The present invention also relates to the application of the above-mentioned tertiary oil recovery oil displacement agent. Background technique [0003] In oil field development, even for the most ideal reservoirs, traditional primary and secondary oil recovery can only recover 40% to 60% of the original formation crude oil reserves; of the original geological reserves remain underground. At present, my country's major oil fields have entered the late stage of secondary oil recovery. In order to improve the recovery rate of existing oil fields, tertiary oil recovery technology has been widely used. Chemical composite flooding technology is a major tertiary oil recovery technology, which uses the organic co...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C09K8/588C09K8/584C08F251/02
Inventor 于芳吴江勇高文骥王晓春王建宇杨捷
Owner CHINA PETROLEUM & CHEM CORP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com