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Modified graphene oxide as well as preparation method and application thereof

A technology of oxidized stone and graphene, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve problems such as single effect, increase displacement fluid viscosity, cumbersome process, etc., achieve high reaction rate, improve oil displacement Good efficiency and stability

Inactive Publication Date: 2020-03-31
NINGBO FENGCHENG ADVANCED ENERGY MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation of salt-tolerant oil displacement agents mainly focuses on the existing polymer modification and binary / ternary multi-component compounding methods. Polymer flooding mainly relies on increasing the viscosity of the displacement fluid, reducing the displacement fluid and The mobility ratio of the liquid and the expansion of the swept volume to achieve the purpose of improving the recovery rate are relatively simple; while the multi-component compound system needs to be adjusted according to specific reservoir conditions, and the process is cumbersome. Once the reservoir conditions change, it needs to be reinstalled Adjust the formula

Method used

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  • Modified graphene oxide as well as preparation method and application thereof
  • Modified graphene oxide as well as preparation method and application thereof
  • Modified graphene oxide as well as preparation method and application thereof

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preparation example Construction

[0054]A preparation method of hydrophilic polymer modified graphene oxide nanoparticles, mainly comprising the following steps:

[0055] Step 1: Preparation of nanoparticle aqueous dispersion: disperse the purchased graphene oxide in distilled water at a concentration of 1-2mg / mL; mechanically stir at 500 rpm for 30min; Time 2-3h, power 40Hz;

[0056] Step 2: Prepare hydrophilic polymer aqueous solution: dissolve the purchased polymer powder in distilled water at a concentration of 20-100 mg / ml; mechanically stir at 500 rpm for 60 minutes until completely dissolved; the hydrophilic polymer includes : Polyvinyl alcohol, xanthan gum, cellulose, chitosan.

[0057] Step 3: Add a catalyst to activate the carboxyl groups on the surface of graphene oxide: Weigh 0.1-0.4g catalyst and add it to the graphene oxide aqueous dispersion in step 1, and stir while adding it dropwise at a stirring speed of 300 rpm to make the graphene oxide Surface carboxyl activation; catalysts include: 1-e...

Embodiment 1

[0061] Step 1: Preparation of nanoparticle aqueous dispersion: disperse the purchased graphene oxide in distilled water at a concentration of 1mg / mL; mechanically stir at 500 rpm for 30min; after stirring evenly, ultrasonically shear for 2h , power 40Hz;

[0062] Step 2: Prepare hydrophilic polymer aqueous solution: Dissolve the purchased hydrophilic polymer powder (polyvinyl alcohol, molecular weight 150,000-200,000) in distilled water at a concentration of 20 mg / mL; mechanically stir at 500 rpm, stir Polyvinyl alcohol 60min until completely dissolved;

[0063] Step 3: Add catalyst to activate carboxyl groups on the surface of graphene oxide: Weigh 0.1g of catalyst 4-dimethylaminopyridine (DMAP) and add it to 200ml of graphene oxide aqueous dispersion in step 1, stir while adding, and the stirring speed is 300 revs / min to activate the carboxyl groups on the surface of graphene oxide;

[0064] Step 4: Slowly add the polyvinyl alcohol aqueous solution prepared in step 2 to th...

Embodiment 2

[0067] Step 1: Preparation of nanoparticle aqueous dispersion: disperse the purchased graphene oxide in distilled water at a concentration of 1mg / mL; mechanically stir at 500 rpm for 30min; after stirring evenly, ultrasonically shear for 3h , power 40Hz;

[0068] Step 2: Preparation of hydrophilic polymer aqueous solution: Dissolve the purchased xanthan gum powder (molecular weight 100,000-150,000) in distilled water at a concentration of 30 mg / mL; stir mechanically at 500 rpm for 60 minutes until completely dissolved ;

[0069] Step 3: Add a catalyst to activate the carboxyl groups on the surface of graphene oxide: Weigh 0.2g of the catalyst 4-dimethylaminopyridine (DMAP) and add it to 200ml of the graphene oxide aqueous dispersion in step 1, and stir while adding it dropwise at a stirring speed of 300 revs / min to activate the carboxyl groups on the surface of graphene oxide;

[0070] Step 4: Slowly add the hydrophilic polymer aqueous solution prepared in step 2 to the grap...

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Abstract

The application discloses modified graphene oxide as well as a preparation method and an application thereof. The modified graphene oxide is prepared through chemical modification of graphene oxide byusing a hydrophilic polymer. In the application, the graphene oxide nanosheet is modified by means of the hydrophilic polymer, wherein the graphene oxide nanosheet can change the wetting-ability of rock in oil reservoir and emulsify raw oil, so that raw oil is easy to strip and move. The water-soluble polymer, through grafting, can improve the stability of the graphene oxide nanosheet in salt water through steric hindrance effect, so that the graphene oxide nanosheet can even exist in high-mineralization formation water stably; even in a high-salt environment, the nanosheet modified by the hydrophilic polymer is stable, so that oil displacement efficiency is effectively increased.

Description

technical field [0001] The application relates to a modified graphene oxide and its preparation method and application, belonging to the technical field of graphene oxide materials. Background technique [0002] Nowadays, most oil fields in our country have entered a period of high water cut and high recovery rate, and many oil fields still need to use tertiary oil recovery to recover more than 60% of crude oil after secondary oil recovery due to recovery difficulties. A large number of studies have shown that chemical flooding (including polymer flooding, surfactant flooding, etc.) in tertiary oil recovery methods can increase oil recovery by 10% to 19%, with great potential. However, there are still many defects in the current chemical flooding technology. For example, surfactants are easily absorbed by rock formations or react with calcium ions to form precipitates, resulting in the loss of surfactants, which greatly affects the promotion of surfactant flooding technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/198C09K8/58C09K8/588
CPCC09K8/58C09K8/588C09K2208/10C01B32/198
Inventor 赵莎莎王金剑明亮王耀国
Owner NINGBO FENGCHENG ADVANCED ENERGY MATERIALS RES INST
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