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Oil-soluble carbon quantum dots, nanofluid composition containing oil-soluble carbon quantum dots and method for inhibiting carbon dioxide flooding asphaltene deposition

A technology of carbon quantum dots and nanofluids, applied in the direction of drilling compositions, nanocarbons, chemical instruments and methods, etc., can solve the problems of rare inhibition and dispersion, achieve enhanced oil recovery and reduce reservoir damage , the effect of inhibiting aggregation

Pending Publication Date: 2022-07-15
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Due to their unique physical and chemical properties, carbon nanomaterials have received more and more attention in the field of enhanced oil recovery, but there are few related studies on the influence of carbon nanomaterials on the inhibition and dispersion of asphaltene deposition.

Method used

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  • Oil-soluble carbon quantum dots, nanofluid composition containing oil-soluble carbon quantum dots and method for inhibiting carbon dioxide flooding asphaltene deposition
  • Oil-soluble carbon quantum dots, nanofluid composition containing oil-soluble carbon quantum dots and method for inhibiting carbon dioxide flooding asphaltene deposition
  • Oil-soluble carbon quantum dots, nanofluid composition containing oil-soluble carbon quantum dots and method for inhibiting carbon dioxide flooding asphaltene deposition

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preparation example Construction

[0057] According to a specific embodiment of the present invention, preferably, the present invention provides a preparation method of oil-soluble carbon quantum dots, which comprises the following steps:

[0058] S1, dissolve the nonionic surfactant in deionized water to obtain a nonionic surfactant solution; then mix the phosphoric acid and the nonionic surfactant solution uniformly to obtain a mixed solution; wherein, the nonionic surface The dosage ratio of the active agent to the deionized water is (100-200) mg: (10-50) mL; the dosage ratio of the non-ionic surfactant to the phosphoric acid is (100-200) mg: (10 ~50) mL;

[0059] S2. After the mixed solution obtained in step S1 is subjected to microwave irradiation at a power of 300 to 600 W for 3 to 20 minutes, a tan solution containing oil-soluble carbon quantum dots is obtained; the solution containing oil-soluble carbon quantum dots is cooled to room temperature;

[0060] S3, adding deionized water to the solution co...

Embodiment 1

[0065] The present embodiment provides an oil-soluble carbon quantum dot and a preparation method thereof, comprising the following steps:

[0066] S1. Weigh 180 mg of polyether F-68, add it to 15 mL of deionized water, and let it stand for 15 minutes at room temperature to fully dissolve to obtain an aqueous solution of polyether F-68; weigh 30 mL of phosphoric acid, add the polyether F-68 In the aqueous solution, stir evenly to obtain a mixed solution;

[0067] S2, place the mixed solution obtained in step S1 in a microwave oven, and irradiate it with a microwave power of 450W for about 9min to obtain a tan solution containing oil-soluble carbon quantum dots, which is taken out of the microwave oven and cooled to room temperature;

[0068] S3, adding 50 mL of deionized water to the solution containing oil-soluble carbon quantum dots obtained in step S2 to obtain a suspension containing a black-brown suspended precipitate, then adding 50 mL of toluene for extraction, using a ...

Embodiment 2

[0072] This embodiment provides a carbon quantum dot nanofluid composition, which is prepared according to the following steps:

[0073]Accurately weigh 0.02g of the oil-soluble carbon quantum dot black powder prepared in Example 1 of the present invention, and add it to 1L of the mixture of propylene glycol fatty acid ester and methyl myristate (the volume ratio of propylene glycol fatty acid ester and methyl myristate). In 3:7), use a magnetic stirring device at room temperature for 1 h at a speed of 800-1000 rpm to make it fully dispersed, then in a water bath at 25 °C with a power of 240W and a frequency of 40KHZ Ultrasonic for 2h, let stand In one night, the carbon quantum dot nanofluid composition was obtained.

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Abstract

The invention provides an oil-soluble carbon quantum dot, a nanofluid composition containing the oil-soluble carbon quantum dot and a method for inhibiting carbon dioxide flooding asphaltene deposition. The preparation method of the oil-soluble carbon quantum dot provided by the invention comprises the step of performing microwave radiation on a mixed solution of a nonionic surfactant and phosphoric acid to obtain the oil-soluble carbon quantum dot. The carbon quantum dot nanofluid composition provided by the invention contains the oil-soluble carbon quantum dot. The method for inhibiting asphaltene deposition in the carbon dioxide flooding process by adopting the carbon quantum dot nanofluid composition comprises the following step: injecting the carbon quantum dot nanofluid composition into a carbon dioxide flooding oil reservoir. The oil-soluble carbon quantum dots and the carbon quantum dot nanofluid composition provided by the invention can effectively inhibit asphaltene deposition in a carbon dioxide flooding process, reduce reservoir damage and improve the crude oil recovery rate.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to an oil-soluble carbon quantum dot, a preparation method and application thereof, a carbon quantum dot nanofluid composition, and a carbon quantum dot nanofluid composition for suppressing CO 2 Methods of asphaltene deposition during flooding. Background technique [0002] Carbon dioxide capture, utilization and storage (CCUS) technology, as one of the important means in my country's technology portfolio to achieve carbon neutrality, has the potential for large-scale deep reduction of greenhouse gases. Among them, carbon dioxide flooding (CO 2 -EOR) technology has broad application prospects, especially for low permeability reservoirs, which can be used as CO 2 Ideal site for storage, where CO 2 In addition to long-term safe storage, it can also improve crude oil recovery, taking into account both economic and social and environmental benefits. However, CO 2 Du...

Claims

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Application Information

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IPC IPC(8): C01B32/15E21B43/22C09K8/524C09K8/594C09K11/65B82Y20/00B82Y30/00
CPCC01B32/15C09K8/524C09K8/594C09K11/65E21B43/164B82Y20/00B82Y30/00C09K2208/10C01P2004/64Y02P20/54
Inventor 刘琦叶航张声威郝宁吴胜坤罗聃
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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